yading@11: /*
yading@11:  * AVI demuxer
yading@11:  * Copyright (c) 2001 Fabrice Bellard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/mathematics.h"
yading@11: #include "libavutil/bswap.h"
yading@11: #include "libavutil/opt.h"
yading@11: #include "libavutil/dict.h"
yading@11: #include "libavutil/avstring.h"
yading@11: #include "libavutil/avassert.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "avi.h"
yading@11: #include "dv.h"
yading@11: #include "riff.h"
yading@11: 
yading@11: typedef struct AVIStream {
yading@11:     int64_t frame_offset; /* current frame (video) or byte (audio) counter
yading@11:                          (used to compute the pts) */
yading@11:     int remaining;
yading@11:     int packet_size;
yading@11: 
yading@11:     uint32_t scale;
yading@11:     uint32_t rate;
yading@11:     int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
yading@11: 
yading@11:     int64_t cum_len; /* temporary storage (used during seek) */
yading@11: 
yading@11:     int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
yading@11:     int prefix_count;
yading@11:     uint32_t pal[256];
yading@11:     int has_pal;
yading@11:     int dshow_block_align;            ///< block align variable used to emulate bugs in the MS dshow demuxer
yading@11: 
yading@11:     AVFormatContext *sub_ctx;
yading@11:     AVPacket sub_pkt;
yading@11:     uint8_t *sub_buffer;
yading@11: 
yading@11:     int64_t seek_pos;
yading@11: } AVIStream;
yading@11: 
yading@11: typedef struct {
yading@11:     const AVClass *class;
yading@11:     int64_t  riff_end;
yading@11:     int64_t  movi_end;
yading@11:     int64_t  fsize;
yading@11:     int64_t io_fsize;
yading@11:     int64_t movi_list;
yading@11:     int64_t last_pkt_pos;
yading@11:     int index_loaded;
yading@11:     int is_odml;
yading@11:     int non_interleaved;
yading@11:     int stream_index;
yading@11:     DVDemuxContext* dv_demux;
yading@11:     int odml_depth;
yading@11:     int use_odml;
yading@11: #define MAX_ODML_DEPTH 1000
yading@11:     int64_t dts_max;
yading@11: } AVIContext;
yading@11: 
yading@11: 
yading@11: static const AVOption options[] = {
yading@11:     { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
yading@11:     { NULL },
yading@11: };
yading@11: 
yading@11: static const AVClass demuxer_class = {
yading@11:     .class_name = "avi",
yading@11:     .item_name  = av_default_item_name,
yading@11:     .option     = options,
yading@11:     .version    = LIBAVUTIL_VERSION_INT,
yading@11:     .category   = AV_CLASS_CATEGORY_DEMUXER,
yading@11: };
yading@11: 
yading@11: 
yading@11: static const char avi_headers[][8] = {
yading@11:     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
yading@11:     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
yading@11:     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
yading@11:     { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
yading@11:     { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
yading@11:     { 0 }
yading@11: };
yading@11: 
yading@11: static const AVMetadataConv avi_metadata_conv[] = {
yading@11:     { "strn", "title" },
yading@11:     { 0 },
yading@11: };
yading@11: 
yading@11: static int avi_load_index(AVFormatContext *s);
yading@11: static int guess_ni_flag(AVFormatContext *s);
yading@11: 
yading@11: #define print_tag(str, tag, size)                       \
yading@11:     av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n",       \
yading@11:            str, tag & 0xff,                             \
yading@11:            (tag >> 8) & 0xff,                           \
yading@11:            (tag >> 16) & 0xff,                          \
yading@11:            (tag >> 24) & 0xff,                          \
yading@11:            size)
yading@11: 
yading@11: static inline int get_duration(AVIStream *ast, int len){
yading@11:     if(ast->sample_size){
yading@11:         return len;
yading@11:     }else if (ast->dshow_block_align){
yading@11:         return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
yading@11:     }else
yading@11:         return 1;
yading@11: }
yading@11: 
yading@11: static int get_riff(AVFormatContext *s, AVIOContext *pb)
yading@11: {
yading@11:     AVIContext *avi = s->priv_data;
yading@11:     char header[8];
yading@11:     int i;
yading@11: 
yading@11:     /* check RIFF header */
yading@11:     avio_read(pb, header, 4);
yading@11:     avi->riff_end = avio_rl32(pb);  /* RIFF chunk size */
yading@11:     avi->riff_end += avio_tell(pb); /* RIFF chunk end */
yading@11:     avio_read(pb, header+4, 4);
yading@11: 
yading@11:     for(i=0; avi_headers[i][0]; i++)
yading@11:         if(!memcmp(header, avi_headers[i], 8))
yading@11:             break;
yading@11:     if(!avi_headers[i][0])
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     if(header[7] == 0x19)
yading@11:         av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
yading@11:     AVIContext *avi = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int longs_pre_entry= avio_rl16(pb);
yading@11:     int index_sub_type = avio_r8(pb);
yading@11:     int index_type     = avio_r8(pb);
yading@11:     int entries_in_use = avio_rl32(pb);
yading@11:     int chunk_id       = avio_rl32(pb);
yading@11:     int64_t base       = avio_rl64(pb);
yading@11:     int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
yading@11:     AVStream *st;
yading@11:     AVIStream *ast;
yading@11:     int i;
yading@11:     int64_t last_pos= -1;
yading@11:     int64_t filesize= avi->fsize;
yading@11: 
yading@11:     av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
yading@11:             longs_pre_entry,index_type, entries_in_use, chunk_id, base);
yading@11: 
yading@11:     if(stream_id >= s->nb_streams || stream_id < 0)
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     st= s->streams[stream_id];
yading@11:     ast = st->priv_data;
yading@11: 
yading@11:     if(index_sub_type)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     avio_rl32(pb);
yading@11: 
yading@11:     if(index_type && longs_pre_entry != 2)
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     if(index_type>1)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     if(filesize > 0 && base >= filesize){
yading@11:         av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
yading@11:         if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
yading@11:             base &= 0xFFFFFFFF;
yading@11:         else
yading@11:             return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     for(i=0; i<entries_in_use; i++){
yading@11:         if(index_type){
yading@11:             int64_t pos= avio_rl32(pb) + base - 8;
yading@11:             int len    = avio_rl32(pb);
yading@11:             int key= len >= 0;
yading@11:             len &= 0x7FFFFFFF;
yading@11: 
yading@11: #ifdef DEBUG_SEEK
yading@11:             av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
yading@11: #endif
yading@11:             if(url_feof(pb))
yading@11:                 return AVERROR_INVALIDDATA;
yading@11: 
yading@11:             if(last_pos == pos || pos == base - 8)
yading@11:                 avi->non_interleaved= 1;
yading@11:             if(last_pos != pos && (len || !ast->sample_size))
yading@11:                 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
yading@11: 
yading@11:             ast->cum_len += get_duration(ast, len);
yading@11:             last_pos= pos;
yading@11:         }else{
yading@11:             int64_t offset, pos;
yading@11:             int duration;
yading@11:             offset = avio_rl64(pb);
yading@11:             avio_rl32(pb);       /* size */
yading@11:             duration = avio_rl32(pb);
yading@11: 
yading@11:             if(url_feof(pb))
yading@11:                 return AVERROR_INVALIDDATA;
yading@11: 
yading@11:             pos = avio_tell(pb);
yading@11: 
yading@11:             if(avi->odml_depth > MAX_ODML_DEPTH){
yading@11:                 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             }
yading@11: 
yading@11:             if(avio_seek(pb, offset+8, SEEK_SET) < 0)
yading@11:                 return -1;
yading@11:             avi->odml_depth++;
yading@11:             read_braindead_odml_indx(s, frame_num);
yading@11:             avi->odml_depth--;
yading@11:             frame_num += duration;
yading@11: 
yading@11:             if(avio_seek(pb, pos, SEEK_SET) < 0) {
yading@11:                 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
yading@11:                 return -1;
yading@11:             }
yading@11: 
yading@11:         }
yading@11:     }
yading@11:     avi->index_loaded=2;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static void clean_index(AVFormatContext *s){
yading@11:     int i;
yading@11:     int64_t j;
yading@11: 
yading@11:     for(i=0; i<s->nb_streams; i++){
yading@11:         AVStream *st = s->streams[i];
yading@11:         AVIStream *ast = st->priv_data;
yading@11:         int n= st->nb_index_entries;
yading@11:         int max= ast->sample_size;
yading@11:         int64_t pos, size, ts;
yading@11: 
yading@11:         if(n != 1 || ast->sample_size==0)
yading@11:             continue;
yading@11: 
yading@11:         while(max < 1024) max+=max;
yading@11: 
yading@11:         pos= st->index_entries[0].pos;
yading@11:         size= st->index_entries[0].size;
yading@11:         ts= st->index_entries[0].timestamp;
yading@11: 
yading@11:         for(j=0; j<size; j+=max){
yading@11:             av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
yading@11:         }
yading@11:     }
yading@11: }
yading@11: 
yading@11: static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
yading@11: {
yading@11:     AVIOContext *pb = s->pb;
yading@11:     char key[5] = {0}, *value;
yading@11: 
yading@11:     size += (size & 1);
yading@11: 
yading@11:     if (size == UINT_MAX)
yading@11:         return AVERROR(EINVAL);
yading@11:     value = av_malloc(size+1);
yading@11:     if (!value)
yading@11:         return AVERROR(ENOMEM);
yading@11:     avio_read(pb, value, size);
yading@11:     value[size]=0;
yading@11: 
yading@11:     AV_WL32(key, tag);
yading@11: 
yading@11:     return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
yading@11:                             AV_DICT_DONT_STRDUP_VAL);
yading@11: }
yading@11: 
yading@11: static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
yading@11:                                     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
yading@11: 
yading@11: static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
yading@11: {
yading@11:     char month[4], time[9], buffer[64];
yading@11:     int i, day, year;
yading@11:     /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
yading@11:     if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
yading@11:                month, &day, time, &year) == 4) {
yading@11:         for (i=0; i<12; i++)
yading@11:             if (!av_strcasecmp(month, months[i])) {
yading@11:                 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
yading@11:                          year, i+1, day, time);
yading@11:                 av_dict_set(metadata, "creation_time", buffer, 0);
yading@11:             }
yading@11:     } else if (date[4] == '/' && date[7] == '/') {
yading@11:         date[4] = date[7] = '-';
yading@11:         av_dict_set(metadata, "creation_time", date, 0);
yading@11:     }
yading@11: }
yading@11: 
yading@11: static void avi_read_nikon(AVFormatContext *s, uint64_t end)
yading@11: {
yading@11:     while (avio_tell(s->pb) < end) {
yading@11:         uint32_t tag  = avio_rl32(s->pb);
yading@11:         uint32_t size = avio_rl32(s->pb);
yading@11:         switch (tag) {
yading@11:         case MKTAG('n', 'c', 't', 'g'): {  /* Nikon Tags */
yading@11:             uint64_t tag_end = avio_tell(s->pb) + size;
yading@11:             while (avio_tell(s->pb) < tag_end) {
yading@11:                 uint16_t tag  = avio_rl16(s->pb);
yading@11:                 uint16_t size = avio_rl16(s->pb);
yading@11:                 const char *name = NULL;
yading@11:                 char buffer[64] = {0};
yading@11:                 size -= avio_read(s->pb, buffer,
yading@11:                                    FFMIN(size, sizeof(buffer)-1));
yading@11:                 switch (tag) {
yading@11:                 case 0x03:  name = "maker";  break;
yading@11:                 case 0x04:  name = "model";  break;
yading@11:                 case 0x13:  name = "creation_time";
yading@11:                     if (buffer[4] == ':' && buffer[7] == ':')
yading@11:                         buffer[4] = buffer[7] = '-';
yading@11:                     break;
yading@11:                 }
yading@11:                 if (name)
yading@11:                     av_dict_set(&s->metadata, name, buffer, 0);
yading@11:                 avio_skip(s->pb, size);
yading@11:             }
yading@11:             break;
yading@11:         }
yading@11:         default:
yading@11:             avio_skip(s->pb, size);
yading@11:             break;
yading@11:         }
yading@11:     }
yading@11: }
yading@11: 
yading@11: static int avi_read_header(AVFormatContext *s)
yading@11: {
yading@11:     AVIContext *avi = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     unsigned int tag, tag1, handler;
yading@11:     int codec_type, stream_index, frame_period;
yading@11:     unsigned int size;
yading@11:     int i;
yading@11:     AVStream *st;
yading@11:     AVIStream *ast = NULL;
yading@11:     int avih_width=0, avih_height=0;
yading@11:     int amv_file_format=0;
yading@11:     uint64_t list_end = 0;
yading@11:     int ret;
yading@11: 
yading@11:     avi->stream_index= -1;
yading@11: 
yading@11:     ret = get_riff(s, pb);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11: 
yading@11:     av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
yading@11: 
yading@11:     avi->io_fsize = avi->fsize = avio_size(pb);
yading@11:     if(avi->fsize<=0 || avi->fsize < avi->riff_end)
yading@11:         avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
yading@11: 
yading@11:     /* first list tag */
yading@11:     stream_index = -1;
yading@11:     codec_type = -1;
yading@11:     frame_period = 0;
yading@11:     for(;;) {
yading@11:         if (url_feof(pb))
yading@11:             goto fail;
yading@11:         tag = avio_rl32(pb);
yading@11:         size = avio_rl32(pb);
yading@11: 
yading@11:         print_tag("tag", tag, size);
yading@11: 
yading@11:         switch(tag) {
yading@11:         case MKTAG('L', 'I', 'S', 'T'):
yading@11:             list_end = avio_tell(pb) + size;
yading@11:             /* Ignored, except at start of video packets. */
yading@11:             tag1 = avio_rl32(pb);
yading@11: 
yading@11:             print_tag("list", tag1, 0);
yading@11: 
yading@11:             if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
yading@11:                 avi->movi_list = avio_tell(pb) - 4;
yading@11:                 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
yading@11:                 else     avi->movi_end = avi->fsize;
yading@11:                 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
yading@11:                 goto end_of_header;
yading@11:             }
yading@11:             else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
yading@11:                 ff_read_riff_info(s, size - 4);
yading@11:             else if (tag1 == MKTAG('n', 'c', 'd', 't'))
yading@11:                 avi_read_nikon(s, list_end);
yading@11: 
yading@11:             break;
yading@11:         case MKTAG('I', 'D', 'I', 'T'): {
yading@11:             unsigned char date[64] = {0};
yading@11:             size += (size & 1);
yading@11:             size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
yading@11:             avio_skip(pb, size);
yading@11:             avi_metadata_creation_time(&s->metadata, date);
yading@11:             break;
yading@11:         }
yading@11:         case MKTAG('d', 'm', 'l', 'h'):
yading@11:             avi->is_odml = 1;
yading@11:             avio_skip(pb, size + (size & 1));
yading@11:             break;
yading@11:         case MKTAG('a', 'm', 'v', 'h'):
yading@11:             amv_file_format=1;
yading@11:         case MKTAG('a', 'v', 'i', 'h'):
yading@11:             /* AVI header */
yading@11:             /* using frame_period is bad idea */
yading@11:             frame_period = avio_rl32(pb);
yading@11:             avio_rl32(pb); /* max. bytes per second */
yading@11:             avio_rl32(pb);
yading@11:             avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
yading@11: 
yading@11:             avio_skip(pb, 2 * 4);
yading@11:             avio_rl32(pb);
yading@11:             avio_rl32(pb);
yading@11:             avih_width=avio_rl32(pb);
yading@11:             avih_height=avio_rl32(pb);
yading@11: 
yading@11:             avio_skip(pb, size - 10 * 4);
yading@11:             break;
yading@11:         case MKTAG('s', 't', 'r', 'h'):
yading@11:             /* stream header */
yading@11: 
yading@11:             tag1 = avio_rl32(pb);
yading@11:             handler = avio_rl32(pb); /* codec tag */
yading@11: 
yading@11:             if(tag1 == MKTAG('p', 'a', 'd', 's')){
yading@11:                 avio_skip(pb, size - 8);
yading@11:                 break;
yading@11:             }else{
yading@11:                 stream_index++;
yading@11:                 st = avformat_new_stream(s, NULL);
yading@11:                 if (!st)
yading@11:                     goto fail;
yading@11: 
yading@11:                 st->id = stream_index;
yading@11:                 ast = av_mallocz(sizeof(AVIStream));
yading@11:                 if (!ast)
yading@11:                     goto fail;
yading@11:                 st->priv_data = ast;
yading@11:             }
yading@11:             if(amv_file_format)
yading@11:                 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
yading@11: 
yading@11:             print_tag("strh", tag1, -1);
yading@11: 
yading@11:             if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
yading@11:                 int64_t dv_dur;
yading@11: 
yading@11:                 /*
yading@11:                  * After some consideration -- I don't think we
yading@11:                  * have to support anything but DV in type1 AVIs.
yading@11:                  */
yading@11:                 if (s->nb_streams != 1)
yading@11:                     goto fail;
yading@11: 
yading@11:                 if (handler != MKTAG('d', 'v', 's', 'd') &&
yading@11:                     handler != MKTAG('d', 'v', 'h', 'd') &&
yading@11:                     handler != MKTAG('d', 'v', 's', 'l'))
yading@11:                    goto fail;
yading@11: 
yading@11:                 ast = s->streams[0]->priv_data;
yading@11:                 av_freep(&s->streams[0]->codec->extradata);
yading@11:                 av_freep(&s->streams[0]->codec);
yading@11:                 if (s->streams[0]->info)
yading@11:                     av_freep(&s->streams[0]->info->duration_error);
yading@11:                 av_freep(&s->streams[0]->info);
yading@11:                 av_freep(&s->streams[0]);
yading@11:                 s->nb_streams = 0;
yading@11:                 if (CONFIG_DV_DEMUXER) {
yading@11:                     avi->dv_demux = avpriv_dv_init_demux(s);
yading@11:                     if (!avi->dv_demux)
yading@11:                         goto fail;
yading@11:                 }
yading@11:                 s->streams[0]->priv_data = ast;
yading@11:                 avio_skip(pb, 3 * 4);
yading@11:                 ast->scale = avio_rl32(pb);
yading@11:                 ast->rate = avio_rl32(pb);
yading@11:                 avio_skip(pb, 4);  /* start time */
yading@11: 
yading@11:                 dv_dur = avio_rl32(pb);
yading@11:                 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
yading@11:                     dv_dur *= AV_TIME_BASE;
yading@11:                     s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
yading@11:                 }
yading@11:                 /*
yading@11:                  * else, leave duration alone; timing estimation in utils.c
yading@11:                  *      will make a guess based on bitrate.
yading@11:                  */
yading@11: 
yading@11:                 stream_index = s->nb_streams - 1;
yading@11:                 avio_skip(pb, size - 9*4);
yading@11:                 break;
yading@11:             }
yading@11: 
yading@11:             av_assert0(stream_index < s->nb_streams);
yading@11:             st->codec->stream_codec_tag= handler;
yading@11: 
yading@11:             avio_rl32(pb); /* flags */
yading@11:             avio_rl16(pb); /* priority */
yading@11:             avio_rl16(pb); /* language */
yading@11:             avio_rl32(pb); /* initial frame */
yading@11:             ast->scale = avio_rl32(pb);
yading@11:             ast->rate = avio_rl32(pb);
yading@11:             if(!(ast->scale && ast->rate)){
yading@11:                 av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate);
yading@11:                 if(frame_period){
yading@11:                     ast->rate = 1000000;
yading@11:                     ast->scale = frame_period;
yading@11:                 }else{
yading@11:                     ast->rate = 25;
yading@11:                     ast->scale = 1;
yading@11:                 }
yading@11:             }
yading@11:             avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
yading@11: 
yading@11:             ast->cum_len=avio_rl32(pb); /* start */
yading@11:             st->nb_frames = avio_rl32(pb);
yading@11: 
yading@11:             st->start_time = 0;
yading@11:             avio_rl32(pb); /* buffer size */
yading@11:             avio_rl32(pb); /* quality */
yading@11:             if (ast->cum_len*ast->scale/ast->rate > 3600) {
yading@11:                 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             }
yading@11:             ast->sample_size = avio_rl32(pb); /* sample ssize */
yading@11:             ast->cum_len *= FFMAX(1, ast->sample_size);
yading@11:             av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
yading@11:                     ast->rate, ast->scale, ast->sample_size);
yading@11: 
yading@11:             switch(tag1) {
yading@11:             case MKTAG('v', 'i', 'd', 's'):
yading@11:                 codec_type = AVMEDIA_TYPE_VIDEO;
yading@11: 
yading@11:                 ast->sample_size = 0;
yading@11:                 break;
yading@11:             case MKTAG('a', 'u', 'd', 's'):
yading@11:                 codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:                 break;
yading@11:             case MKTAG('t', 'x', 't', 's'):
yading@11:                 codec_type = AVMEDIA_TYPE_SUBTITLE;
yading@11:                 break;
yading@11:             case MKTAG('d', 'a', 't', 's'):
yading@11:                 codec_type = AVMEDIA_TYPE_DATA;
yading@11:                 break;
yading@11:             default:
yading@11:                 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
yading@11:             }
yading@11:             if(ast->sample_size == 0) {
yading@11:                 st->duration = st->nb_frames;
yading@11:                 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
yading@11:                     av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
yading@11:                     st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
yading@11:                 }
yading@11:             }
yading@11:             ast->frame_offset= ast->cum_len;
yading@11:             avio_skip(pb, size - 12 * 4);
yading@11:             break;
yading@11:         case MKTAG('s', 't', 'r', 'f'):
yading@11:             /* stream header */
yading@11:             if (!size)
yading@11:                 break;
yading@11:             if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
yading@11:                 avio_skip(pb, size);
yading@11:             } else {
yading@11:                 uint64_t cur_pos = avio_tell(pb);
yading@11:                 unsigned esize;
yading@11:                 if (cur_pos < list_end)
yading@11:                     size = FFMIN(size, list_end - cur_pos);
yading@11:                 st = s->streams[stream_index];
yading@11:                 switch(codec_type) {
yading@11:                 case AVMEDIA_TYPE_VIDEO:
yading@11:                     if(amv_file_format){
yading@11:                         st->codec->width=avih_width;
yading@11:                         st->codec->height=avih_height;
yading@11:                         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:                         st->codec->codec_id = AV_CODEC_ID_AMV;
yading@11:                         avio_skip(pb, size);
yading@11:                         break;
yading@11:                     }
yading@11:                     tag1 = ff_get_bmp_header(pb, st, &esize);
yading@11: 
yading@11:                     if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
yading@11:                         st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
yading@11:                         st->codec->codec_tag = tag1;
yading@11:                         st->codec->codec_id = AV_CODEC_ID_XSUB;
yading@11:                         break;
yading@11:                     }
yading@11: 
yading@11:                     if(size > 10*4 && size<(1<<30) && size < avi->fsize){
yading@11:                         if(esize == size-1 && (esize&1)) st->codec->extradata_size= esize - 10*4;
yading@11:                         else                             st->codec->extradata_size=  size - 10*4;
yading@11:                         st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:                         if (!st->codec->extradata) {
yading@11:                             st->codec->extradata_size= 0;
yading@11:                             return AVERROR(ENOMEM);
yading@11:                         }
yading@11:                         avio_read(pb, st->codec->extradata, st->codec->extradata_size);
yading@11:                     }
yading@11: 
yading@11:                     if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
yading@11:                         avio_r8(pb);
yading@11: 
yading@11:                     /* Extract palette from extradata if bpp <= 8. */
yading@11:                     /* This code assumes that extradata contains only palette. */
yading@11:                     /* This is true for all paletted codecs implemented in FFmpeg. */
yading@11:                     if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
yading@11:                         int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
yading@11:                         const uint8_t *pal_src;
yading@11: 
yading@11:                         pal_size = FFMIN(pal_size, st->codec->extradata_size);
yading@11:                         pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
yading@11:                         for (i = 0; i < pal_size/4; i++)
yading@11:                             ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
yading@11:                         ast->has_pal = 1;
yading@11:                     }
yading@11: 
yading@11:                     print_tag("video", tag1, 0);
yading@11: 
yading@11:                     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:                     st->codec->codec_tag = tag1;
yading@11:                     st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
yading@11:                     st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
yading@11: 
yading@11:                     if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
yading@11:                         st->codec->extradata_size+= 9;
yading@11:                         st->codec->extradata= av_realloc_f(st->codec->extradata, 1, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:                         if(st->codec->extradata)
yading@11:                             memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
yading@11:                     }
yading@11:                     st->codec->height= FFABS(st->codec->height);
yading@11: 
yading@11: //                    avio_skip(pb, size - 5 * 4);
yading@11:                     break;
yading@11:                 case AVMEDIA_TYPE_AUDIO:
yading@11:                     ret = ff_get_wav_header(pb, st->codec, size);
yading@11:                     if (ret < 0)
yading@11:                         return ret;
yading@11:                     ast->dshow_block_align= st->codec->block_align;
yading@11:                     if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
yading@11:                         av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
yading@11:                         ast->sample_size= st->codec->block_align;
yading@11:                     }
yading@11:                     if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
yading@11:                         avio_skip(pb, 1);
yading@11:                     /* Force parsing as several audio frames can be in
yading@11:                      * one packet and timestamps refer to packet start. */
yading@11:                     st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
yading@11:                     /* ADTS header is in extradata, AAC without header must be
yading@11:                      * stored as exact frames. Parser not needed and it will
yading@11:                      * fail. */
yading@11:                     if (st->codec->codec_id == AV_CODEC_ID_AAC && st->codec->extradata_size)
yading@11:                         st->need_parsing = AVSTREAM_PARSE_NONE;
yading@11:                     /* AVI files with Xan DPCM audio (wrongly) declare PCM
yading@11:                      * audio in the header but have Axan as stream_code_tag. */
yading@11:                     if (st->codec->stream_codec_tag == AV_RL32("Axan")){
yading@11:                         st->codec->codec_id  = AV_CODEC_ID_XAN_DPCM;
yading@11:                         st->codec->codec_tag = 0;
yading@11:                         ast->dshow_block_align = 0;
yading@11:                     }
yading@11:                     if (amv_file_format){
yading@11:                         st->codec->codec_id  = AV_CODEC_ID_ADPCM_IMA_AMV;
yading@11:                         ast->dshow_block_align = 0;
yading@11:                     }
yading@11:                     if(st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
yading@11:                         av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
yading@11:                         ast->dshow_block_align = 0;
yading@11:                     }
yading@11:                     if(st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
yading@11:                        st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
yading@11:                        st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
yading@11:                         av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
yading@11:                         ast->sample_size = 0;
yading@11:                     }
yading@11:                     break;
yading@11:                 case AVMEDIA_TYPE_SUBTITLE:
yading@11:                     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
yading@11:                     st->request_probe= 1;
yading@11:                     avio_skip(pb, size);
yading@11:                     break;
yading@11:                 default:
yading@11:                     st->codec->codec_type = AVMEDIA_TYPE_DATA;
yading@11:                     st->codec->codec_id= AV_CODEC_ID_NONE;
yading@11:                     st->codec->codec_tag= 0;
yading@11:                     avio_skip(pb, size);
yading@11:                     break;
yading@11:                 }
yading@11:             }
yading@11:             break;
yading@11:         case MKTAG('s', 't', 'r', 'd'):
yading@11:             if (stream_index >= (unsigned)s->nb_streams || s->streams[stream_index]->codec->extradata_size) {
yading@11:                 avio_skip(pb, size);
yading@11:             } else {
yading@11:                 uint64_t cur_pos = avio_tell(pb);
yading@11:                 if (cur_pos < list_end)
yading@11:                     size = FFMIN(size, list_end - cur_pos);
yading@11:                 st = s->streams[stream_index];
yading@11: 
yading@11:                 if(size<(1<<30)){
yading@11:                     st->codec->extradata_size= size;
yading@11:                     st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:                     if (!st->codec->extradata) {
yading@11:                         st->codec->extradata_size= 0;
yading@11:                         return AVERROR(ENOMEM);
yading@11:                     }
yading@11:                     avio_read(pb, st->codec->extradata, st->codec->extradata_size);
yading@11:                 }
yading@11: 
yading@11:                 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
yading@11:                     avio_r8(pb);
yading@11:             }
yading@11:             break;
yading@11:         case MKTAG('i', 'n', 'd', 'x'):
yading@11:             i= avio_tell(pb);
yading@11:             if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml &&
yading@11:                read_braindead_odml_indx(s, 0) < 0 && (s->error_recognition & AV_EF_EXPLODE))
yading@11:                 goto fail;
yading@11:             avio_seek(pb, i+size, SEEK_SET);
yading@11:             break;
yading@11:         case MKTAG('v', 'p', 'r', 'p'):
yading@11:             if(stream_index < (unsigned)s->nb_streams && size > 9*4){
yading@11:                 AVRational active, active_aspect;
yading@11: 
yading@11:                 st = s->streams[stream_index];
yading@11:                 avio_rl32(pb);
yading@11:                 avio_rl32(pb);
yading@11:                 avio_rl32(pb);
yading@11:                 avio_rl32(pb);
yading@11:                 avio_rl32(pb);
yading@11: 
yading@11:                 active_aspect.den= avio_rl16(pb);
yading@11:                 active_aspect.num= avio_rl16(pb);
yading@11:                 active.num       = avio_rl32(pb);
yading@11:                 active.den       = avio_rl32(pb);
yading@11:                 avio_rl32(pb); //nbFieldsPerFrame
yading@11: 
yading@11:                 if(active_aspect.num && active_aspect.den && active.num && active.den){
yading@11:                     st->sample_aspect_ratio= av_div_q(active_aspect, active);
yading@11:                     av_dlog(s, "vprp %d/%d %d/%d\n",
yading@11:                             active_aspect.num, active_aspect.den,
yading@11:                             active.num, active.den);
yading@11:                 }
yading@11:                 size -= 9*4;
yading@11:             }
yading@11:             avio_skip(pb, size);
yading@11:             break;
yading@11:         case MKTAG('s', 't', 'r', 'n'):
yading@11:             if(s->nb_streams){
yading@11:                 ret = avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
yading@11:                 if (ret < 0)
yading@11:                     return ret;
yading@11:                 break;
yading@11:             }
yading@11:         default:
yading@11:             if(size > 1000000){
yading@11:                 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
yading@11:                                         "I will ignore it and try to continue anyway.\n");
yading@11:                 if (s->error_recognition & AV_EF_EXPLODE)
yading@11:                     goto fail;
yading@11:                 avi->movi_list = avio_tell(pb) - 4;
yading@11:                 avi->movi_end  = avi->fsize;
yading@11:                 goto end_of_header;
yading@11:             }
yading@11:             /* skip tag */
yading@11:             size += (size & 1);
yading@11:             avio_skip(pb, size);
yading@11:             break;
yading@11:         }
yading@11:     }
yading@11:  end_of_header:
yading@11:     /* check stream number */
yading@11:     if (stream_index != s->nb_streams - 1) {
yading@11:     fail:
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     if(!avi->index_loaded && pb->seekable)
yading@11:         avi_load_index(s);
yading@11:     avi->index_loaded |= 1;
yading@11:     avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
yading@11:     for(i=0; i<s->nb_streams; i++){
yading@11:         AVStream *st = s->streams[i];
yading@11:         if(st->nb_index_entries)
yading@11:             break;
yading@11:     }
yading@11:     // DV-in-AVI cannot be non-interleaved, if set this must be
yading@11:     // a mis-detection.
yading@11:     if(avi->dv_demux)
yading@11:         avi->non_interleaved=0;
yading@11:     if(i==s->nb_streams && avi->non_interleaved) {
yading@11:         av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
yading@11:         avi->non_interleaved=0;
yading@11:     }
yading@11: 
yading@11:     if(avi->non_interleaved) {
yading@11:         av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
yading@11:         clean_index(s);
yading@11:     }
yading@11: 
yading@11:     ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
yading@11:     ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
yading@11:     if (pkt->data && !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
yading@11:         uint8_t desc[256];
yading@11:         int score = AVPROBE_SCORE_MAX / 2, ret;
yading@11:         AVIStream *ast = st->priv_data;
yading@11:         AVInputFormat *sub_demuxer;
yading@11:         AVRational time_base;
yading@11:         AVIOContext *pb = avio_alloc_context( pkt->data + 7,
yading@11:                                               pkt->size - 7,
yading@11:                                               0, NULL, NULL, NULL, NULL);
yading@11:         AVProbeData pd;
yading@11:         unsigned int desc_len = avio_rl32(pb);
yading@11: 
yading@11:         if (desc_len > pb->buf_end - pb->buf_ptr)
yading@11:             goto error;
yading@11: 
yading@11:         ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
yading@11:         avio_skip(pb, desc_len - ret);
yading@11:         if (*desc)
yading@11:             av_dict_set(&st->metadata, "title", desc, 0);
yading@11: 
yading@11:         avio_rl16(pb);   /* flags? */
yading@11:         avio_rl32(pb);   /* data size */
yading@11: 
yading@11:         pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
yading@11:         if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
yading@11:             goto error;
yading@11: 
yading@11:         if (!(ast->sub_ctx = avformat_alloc_context()))
yading@11:             goto error;
yading@11: 
yading@11:         ast->sub_ctx->pb      = pb;
yading@11:         if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
yading@11:             ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
yading@11:             *st->codec = *ast->sub_ctx->streams[0]->codec;
yading@11:             ast->sub_ctx->streams[0]->codec->extradata = NULL;
yading@11:             time_base = ast->sub_ctx->streams[0]->time_base;
yading@11:             avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
yading@11:         }
yading@11:         ast->sub_buffer = pkt->data;
yading@11:         memset(pkt, 0, sizeof(*pkt));
yading@11:         return 1;
yading@11: error:
yading@11:         av_freep(&pb);
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
yading@11:                                   AVPacket *pkt)
yading@11: {
yading@11:     AVIStream *ast, *next_ast = next_st->priv_data;
yading@11:     int64_t ts, next_ts, ts_min = INT64_MAX;
yading@11:     AVStream *st, *sub_st = NULL;
yading@11:     int i;
yading@11: 
yading@11:     next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
yading@11:                            AV_TIME_BASE_Q);
yading@11: 
yading@11:     for (i=0; i<s->nb_streams; i++) {
yading@11:         st  = s->streams[i];
yading@11:         ast = st->priv_data;
yading@11:         if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
yading@11:             ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
yading@11:             if (ts <= next_ts && ts < ts_min) {
yading@11:                 ts_min = ts;
yading@11:                 sub_st = st;
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if (sub_st) {
yading@11:         ast = sub_st->priv_data;
yading@11:         *pkt = ast->sub_pkt;
yading@11:         pkt->stream_index = sub_st->index;
yading@11:         if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
yading@11:             ast->sub_pkt.data = NULL;
yading@11:     }
yading@11:     return sub_st;
yading@11: }
yading@11: 
yading@11: static int get_stream_idx(int *d){
yading@11:     if(    d[0] >= '0' && d[0] <= '9'
yading@11:         && d[1] >= '0' && d[1] <= '9'){
yading@11:         return (d[0] - '0') * 10 + (d[1] - '0');
yading@11:     }else{
yading@11:         return 100; //invalid stream ID
yading@11:     }
yading@11: }
yading@11: 
yading@11: /**
yading@11:  *
yading@11:  * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
yading@11:  */
yading@11: static int avi_sync(AVFormatContext *s, int exit_early)
yading@11: {
yading@11:     AVIContext *avi = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int n;
yading@11:     unsigned int d[8];
yading@11:     unsigned int size;
yading@11:     int64_t i, sync;
yading@11: 
yading@11: start_sync:
yading@11:     memset(d, -1, sizeof(d));
yading@11:     for(i=sync=avio_tell(pb); !url_feof(pb); i++) {
yading@11:         int j;
yading@11: 
yading@11:         for(j=0; j<7; j++)
yading@11:             d[j]= d[j+1];
yading@11:         d[7]= avio_r8(pb);
yading@11: 
yading@11:         size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
yading@11: 
yading@11:         n= get_stream_idx(d+2);
yading@11:         av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
yading@11:                 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
yading@11:         if(i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
yading@11:             continue;
yading@11: 
yading@11:         //parse ix##
yading@11:         if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
yading@11:         //parse JUNK
yading@11:            ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
yading@11:            ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
yading@11:             avio_skip(pb, size);
yading@11:             goto start_sync;
yading@11:         }
yading@11: 
yading@11:         //parse stray LIST
yading@11:         if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
yading@11:             avio_skip(pb, 4);
yading@11:             goto start_sync;
yading@11:         }
yading@11: 
yading@11:         n= get_stream_idx(d);
yading@11: 
yading@11:         if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
yading@11:             continue;
yading@11: 
yading@11:         //detect ##ix chunk and skip
yading@11:         if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
yading@11:             avio_skip(pb, size);
yading@11:             goto start_sync;
yading@11:         }
yading@11: 
yading@11:         //parse ##dc/##wb
yading@11:         if(n < s->nb_streams){
yading@11:             AVStream *st;
yading@11:             AVIStream *ast;
yading@11:             st = s->streams[n];
yading@11:             ast = st->priv_data;
yading@11: 
yading@11:             if (!ast) {
yading@11:                 av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n);
yading@11:                 continue;
yading@11:             }
yading@11: 
yading@11:             if(s->nb_streams>=2){
yading@11:                 AVStream *st1  = s->streams[1];
yading@11:                 AVIStream *ast1= st1->priv_data;
yading@11:                 //workaround for broken small-file-bug402.avi
yading@11:                 if(   d[2] == 'w' && d[3] == 'b'
yading@11:                    && n==0
yading@11:                    && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
yading@11:                    && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
yading@11:                    && ast->prefix == 'd'*256+'c'
yading@11:                    && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
yading@11:                   ){
yading@11:                     n=1;
yading@11:                     st = st1;
yading@11:                     ast = ast1;
yading@11:                     av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
yading@11:                 }
yading@11:             }
yading@11: 
yading@11: 
yading@11:             if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
yading@11:                /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
yading@11:                || st->discard >= AVDISCARD_ALL){
yading@11:                 if (!exit_early) {
yading@11:                     ast->frame_offset += get_duration(ast, size);
yading@11:                 }
yading@11:                 avio_skip(pb, size);
yading@11:                 goto start_sync;
yading@11:             }
yading@11: 
yading@11:             if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
yading@11:                 int k = avio_r8(pb);
yading@11:                 int last = (k + avio_r8(pb) - 1) & 0xFF;
yading@11: 
yading@11:                 avio_rl16(pb); //flags
yading@11: 
yading@11:                 for (; k <= last; k++)
yading@11:                     ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
yading@11:                 ast->has_pal= 1;
yading@11:                 goto start_sync;
yading@11:             } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
yading@11:                          d[2]*256+d[3] == ast->prefix /*||
yading@11:                          (d[2] == 'd' && d[3] == 'c') ||
yading@11:                          (d[2] == 'w' && d[3] == 'b')*/) {
yading@11: 
yading@11:                 if (exit_early)
yading@11:                     return 0;
yading@11:                 if(d[2]*256+d[3] == ast->prefix)
yading@11:                     ast->prefix_count++;
yading@11:                 else{
yading@11:                     ast->prefix= d[2]*256+d[3];
yading@11:                     ast->prefix_count= 0;
yading@11:                 }
yading@11: 
yading@11:                 avi->stream_index= n;
yading@11:                 ast->packet_size= size + 8;
yading@11:                 ast->remaining= size;
yading@11: 
yading@11:                 if(size || !ast->sample_size){
yading@11:                     uint64_t pos= avio_tell(pb) - 8;
yading@11:                     if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
yading@11:                         av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
yading@11:                     }
yading@11:                 }
yading@11:                 return 0;
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if(pb->error)
yading@11:         return pb->error;
yading@11:     return AVERROR_EOF;
yading@11: }
yading@11: 
yading@11: static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     AVIContext *avi = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int err;
yading@11: #if FF_API_DESTRUCT_PACKET
yading@11:     void* dstr;
yading@11: #endif
yading@11: 
yading@11:     if (CONFIG_DV_DEMUXER && avi->dv_demux) {
yading@11:         int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
yading@11:         if (size >= 0)
yading@11:             return size;
yading@11:     }
yading@11: 
yading@11:     if(avi->non_interleaved){
yading@11:         int best_stream_index = 0;
yading@11:         AVStream *best_st= NULL;
yading@11:         AVIStream *best_ast;
yading@11:         int64_t best_ts= INT64_MAX;
yading@11:         int i;
yading@11: 
yading@11:         for(i=0; i<s->nb_streams; i++){
yading@11:             AVStream *st = s->streams[i];
yading@11:             AVIStream *ast = st->priv_data;
yading@11:             int64_t ts= ast->frame_offset;
yading@11:             int64_t last_ts;
yading@11: 
yading@11:             if(!st->nb_index_entries)
yading@11:                 continue;
yading@11: 
yading@11:             last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
yading@11:             if(!ast->remaining && ts > last_ts)
yading@11:                 continue;
yading@11: 
yading@11:             ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
yading@11: 
yading@11:             av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
yading@11:                     st->time_base.num, st->time_base.den, ast->frame_offset);
yading@11:             if(ts < best_ts){
yading@11:                 best_ts= ts;
yading@11:                 best_st= st;
yading@11:                 best_stream_index= i;
yading@11:             }
yading@11:         }
yading@11:         if(!best_st)
yading@11:             return AVERROR_EOF;
yading@11: 
yading@11:         best_ast = best_st->priv_data;
yading@11:         best_ts = best_ast->frame_offset;
yading@11:         if(best_ast->remaining)
yading@11:             i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
yading@11:         else{
yading@11:             i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
yading@11:             if(i>=0)
yading@11:                 best_ast->frame_offset= best_st->index_entries[i].timestamp;
yading@11:         }
yading@11: 
yading@11:         if(i>=0){
yading@11:             int64_t pos= best_st->index_entries[i].pos;
yading@11:             pos += best_ast->packet_size - best_ast->remaining;
yading@11:             if(avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
yading@11:               return AVERROR_EOF;
yading@11: 
yading@11:             av_assert0(best_ast->remaining <= best_ast->packet_size);
yading@11: 
yading@11:             avi->stream_index= best_stream_index;
yading@11:             if(!best_ast->remaining)
yading@11:                 best_ast->packet_size=
yading@11:                 best_ast->remaining= best_st->index_entries[i].size;
yading@11:         }
yading@11:         else
yading@11:           return AVERROR_EOF;
yading@11:     }
yading@11: 
yading@11: resync:
yading@11:     if(avi->stream_index >= 0){
yading@11:         AVStream *st= s->streams[ avi->stream_index ];
yading@11:         AVIStream *ast= st->priv_data;
yading@11:         int size, err;
yading@11: 
yading@11:         if(get_subtitle_pkt(s, st, pkt))
yading@11:             return 0;
yading@11: 
yading@11:         if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
yading@11:             size= INT_MAX;
yading@11:         else if(ast->sample_size < 32)
yading@11:             // arbitrary multiplier to avoid tiny packets for raw PCM data
yading@11:             size= 1024*ast->sample_size;
yading@11:         else
yading@11:             size= ast->sample_size;
yading@11: 
yading@11:         if(size > ast->remaining)
yading@11:             size= ast->remaining;
yading@11:         avi->last_pkt_pos= avio_tell(pb);
yading@11:         err= av_get_packet(pb, pkt, size);
yading@11:         if(err<0)
yading@11:             return err;
yading@11:         size = err;
yading@11: 
yading@11:         if(ast->has_pal && pkt->size<(unsigned)INT_MAX/2){
yading@11:             uint8_t *pal;
yading@11:             pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
yading@11:             if(!pal){
yading@11:                 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
yading@11:             }else{
yading@11:                 memcpy(pal, ast->pal, AVPALETTE_SIZE);
yading@11:                 ast->has_pal = 0;
yading@11:             }
yading@11:         }
yading@11: 
yading@11:         if (CONFIG_DV_DEMUXER && avi->dv_demux) {
yading@11:             AVBufferRef *avbuf = pkt->buf;
yading@11: #if FF_API_DESTRUCT_PACKET
yading@11:             dstr = pkt->destruct;
yading@11: #endif
yading@11:             size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
yading@11:                                     pkt->data, pkt->size, pkt->pos);
yading@11: #if FF_API_DESTRUCT_PACKET
yading@11:             pkt->destruct = dstr;
yading@11: #endif
yading@11:             pkt->buf = avbuf;
yading@11:             pkt->flags |= AV_PKT_FLAG_KEY;
yading@11:             if (size < 0)
yading@11:                 av_free_packet(pkt);
yading@11:         } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
yading@11:                    && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
yading@11:             ast->frame_offset++;
yading@11:             avi->stream_index = -1;
yading@11:             ast->remaining = 0;
yading@11:             goto resync;
yading@11:         } else {
yading@11:             /* XXX: How to handle B-frames in AVI? */
yading@11:             pkt->dts = ast->frame_offset;
yading@11: //                pkt->dts += ast->start;
yading@11:             if(ast->sample_size)
yading@11:                 pkt->dts /= ast->sample_size;
yading@11:             av_dlog(s, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n",
yading@11:                     pkt->dts, ast->frame_offset, ast->scale, ast->rate,
yading@11:                     ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
yading@11:             pkt->stream_index = avi->stream_index;
yading@11: 
yading@11:             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
yading@11:                 AVIndexEntry *e;
yading@11:                 int index;
yading@11:                 av_assert0(st->index_entries);
yading@11: 
yading@11:                 index= av_index_search_timestamp(st, ast->frame_offset, 0);
yading@11:                 e= &st->index_entries[index];
yading@11: 
yading@11:                 if(index >= 0 && e->timestamp == ast->frame_offset){
yading@11:                     if (index == st->nb_index_entries-1){
yading@11:                         int key=1;
yading@11:                         int i;
yading@11:                         uint32_t state=-1;
yading@11:                         for(i=0; i<FFMIN(size,256); i++){
yading@11:                             if(st->codec->codec_id == AV_CODEC_ID_MPEG4){
yading@11:                                 if(state == 0x1B6){
yading@11:                                     key= !(pkt->data[i]&0xC0);
yading@11:                                     break;
yading@11:                                 }
yading@11:                             }else
yading@11:                                 break;
yading@11:                             state= (state<<8) + pkt->data[i];
yading@11:                         }
yading@11:                         if(!key)
yading@11:                             e->flags &= ~AVINDEX_KEYFRAME;
yading@11:                     }
yading@11:                     if (e->flags & AVINDEX_KEYFRAME)
yading@11:                         pkt->flags |= AV_PKT_FLAG_KEY;
yading@11:                 }
yading@11:             } else {
yading@11:                 pkt->flags |= AV_PKT_FLAG_KEY;
yading@11:             }
yading@11:             ast->frame_offset += get_duration(ast, pkt->size);
yading@11:         }
yading@11:         ast->remaining -= err;
yading@11:         if(!ast->remaining){
yading@11:             avi->stream_index= -1;
yading@11:             ast->packet_size= 0;
yading@11:         }
yading@11: 
yading@11:         if(!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos){
yading@11:             av_free_packet(pkt);
yading@11:             goto resync;
yading@11:         }
yading@11:         ast->seek_pos= 0;
yading@11: 
yading@11:         if(!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1){
yading@11:             int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
yading@11: 
yading@11:             if(avi->dts_max - dts > 2*AV_TIME_BASE){
yading@11:                 avi->non_interleaved= 1;
yading@11:                 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
yading@11:             }else if(avi->dts_max < dts)
yading@11:                 avi->dts_max = dts;
yading@11:         }
yading@11: 
yading@11:         return 0;
yading@11:     }
yading@11: 
yading@11:     if ((err = avi_sync(s, 0)) < 0)
yading@11:         return err;
yading@11:     goto resync;
yading@11: }
yading@11: 
yading@11: /* XXX: We make the implicit supposition that the positions are sorted
yading@11:    for each stream. */
yading@11: static int avi_read_idx1(AVFormatContext *s, int size)
yading@11: {
yading@11:     AVIContext *avi = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int nb_index_entries, i;
yading@11:     AVStream *st;
yading@11:     AVIStream *ast;
yading@11:     unsigned int index, tag, flags, pos, len, first_packet = 1;
yading@11:     unsigned last_pos= -1;
yading@11:     unsigned last_idx= -1;
yading@11:     int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
yading@11:     int anykey = 0;
yading@11: 
yading@11:     nb_index_entries = size / 16;
yading@11:     if (nb_index_entries <= 0)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     idx1_pos = avio_tell(pb);
yading@11:     avio_seek(pb, avi->movi_list+4, SEEK_SET);
yading@11:     if (avi_sync(s, 1) == 0) {
yading@11:         first_packet_pos = avio_tell(pb) - 8;
yading@11:     }
yading@11:     avi->stream_index = -1;
yading@11:     avio_seek(pb, idx1_pos, SEEK_SET);
yading@11: 
yading@11:     if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")){
yading@11:         first_packet_pos = 0;
yading@11:         data_offset = avi->movi_list;
yading@11:     }
yading@11: 
yading@11:     /* Read the entries and sort them in each stream component. */
yading@11:     for(i = 0; i < nb_index_entries; i++) {
yading@11:         if(url_feof(pb))
yading@11:             return -1;
yading@11: 
yading@11:         tag = avio_rl32(pb);
yading@11:         flags = avio_rl32(pb);
yading@11:         pos = avio_rl32(pb);
yading@11:         len = avio_rl32(pb);
yading@11:         av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
yading@11:                 i, tag, flags, pos, len);
yading@11: 
yading@11:         index = ((tag & 0xff) - '0') * 10;
yading@11:         index += ((tag >> 8) & 0xff) - '0';
yading@11:         if (index >= s->nb_streams)
yading@11:             continue;
yading@11:         st = s->streams[index];
yading@11:         ast = st->priv_data;
yading@11: 
yading@11:         if(first_packet && first_packet_pos && len) {
yading@11:             data_offset = first_packet_pos - pos;
yading@11:             first_packet = 0;
yading@11:         }
yading@11:         pos += data_offset;
yading@11: 
yading@11:         av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
yading@11: 
yading@11:         // even if we have only a single stream, we should
yading@11:         // switch to non-interleaved to get correct timestamps
yading@11:         if(last_pos == pos)
yading@11:             avi->non_interleaved= 1;
yading@11:         if(last_idx != pos && len) {
yading@11:             av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
yading@11:             last_idx= pos;
yading@11:         }
yading@11:         ast->cum_len += get_duration(ast, len);
yading@11:         last_pos= pos;
yading@11:         anykey |= flags&AVIIF_INDEX;
yading@11:     }
yading@11:     if (!anykey) {
yading@11:         for (index = 0; index < s->nb_streams; index++) {
yading@11:             st = s->streams[index];
yading@11:             if (st->nb_index_entries)
yading@11:                 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
yading@11:         }
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int guess_ni_flag(AVFormatContext *s){
yading@11:     int i;
yading@11:     int64_t last_start=0;
yading@11:     int64_t first_end= INT64_MAX;
yading@11:     int64_t oldpos= avio_tell(s->pb);
yading@11:     int *idx;
yading@11:     int64_t min_pos, pos;
yading@11: 
yading@11:     for(i=0; i<s->nb_streams; i++){
yading@11:         AVStream *st = s->streams[i];
yading@11:         int n= st->nb_index_entries;
yading@11:         unsigned int size;
yading@11: 
yading@11:         if(n <= 0)
yading@11:             continue;
yading@11: 
yading@11:         if(n >= 2){
yading@11:             int64_t pos= st->index_entries[0].pos;
yading@11:             avio_seek(s->pb, pos + 4, SEEK_SET);
yading@11:             size= avio_rl32(s->pb);
yading@11:             if(pos + size > st->index_entries[1].pos)
yading@11:                 last_start= INT64_MAX;
yading@11:         }
yading@11: 
yading@11:         if(st->index_entries[0].pos > last_start)
yading@11:             last_start= st->index_entries[0].pos;
yading@11:         if(st->index_entries[n-1].pos < first_end)
yading@11:             first_end= st->index_entries[n-1].pos;
yading@11:     }
yading@11:     avio_seek(s->pb, oldpos, SEEK_SET);
yading@11:     if (last_start > first_end)
yading@11:         return 1;
yading@11:     idx= av_mallocz(sizeof(*idx) * s->nb_streams);
yading@11:     for (min_pos=pos=0; min_pos!=INT64_MAX; pos= min_pos+1LU) {
yading@11:         int64_t max_dts = INT64_MIN/2, min_dts= INT64_MAX/2;
yading@11:         min_pos = INT64_MAX;
yading@11: 
yading@11:         for (i=0; i<s->nb_streams; i++) {
yading@11:             AVStream *st = s->streams[i];
yading@11:             int n= st->nb_index_entries;
yading@11:             while (idx[i]<n && st->index_entries[idx[i]].pos < pos)
yading@11:                 idx[i]++;
yading@11:             if (idx[i] < n) {
yading@11:                 min_dts = FFMIN(min_dts, av_rescale_q(st->index_entries[idx[i]].timestamp, st->time_base, AV_TIME_BASE_Q));
yading@11:                 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
yading@11:             }
yading@11:             if (idx[i])
yading@11:                 max_dts = FFMAX(max_dts, av_rescale_q(st->index_entries[idx[i]-1].timestamp, st->time_base, AV_TIME_BASE_Q));
yading@11:         }
yading@11:         if(max_dts - min_dts > 2*AV_TIME_BASE) {
yading@11:             av_free(idx);
yading@11:             return 1;
yading@11:         }
yading@11:     }
yading@11:     av_free(idx);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int avi_load_index(AVFormatContext *s)
yading@11: {
yading@11:     AVIContext *avi = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     uint32_t tag, size;
yading@11:     int64_t pos= avio_tell(pb);
yading@11:     int64_t next;
yading@11:     int ret = -1;
yading@11: 
yading@11:     if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
yading@11:         goto the_end; // maybe truncated file
yading@11:     av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
yading@11:     for(;;) {
yading@11:         tag = avio_rl32(pb);
yading@11:         size = avio_rl32(pb);
yading@11:         if (url_feof(pb))
yading@11:             break;
yading@11:         next = avio_tell(pb) + size + (size & 1);
yading@11: 
yading@11:         av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
yading@11:                  tag        & 0xff,
yading@11:                 (tag >>  8) & 0xff,
yading@11:                 (tag >> 16) & 0xff,
yading@11:                 (tag >> 24) & 0xff,
yading@11:                 size);
yading@11: 
yading@11:         if (tag == MKTAG('i', 'd', 'x', '1') &&
yading@11:             avi_read_idx1(s, size) >= 0) {
yading@11:             avi->index_loaded=2;
yading@11:             ret = 0;
yading@11:         }else if(tag == MKTAG('L', 'I', 'S', 'T')) {
yading@11:             uint32_t tag1 = avio_rl32(pb);
yading@11: 
yading@11:             if (tag1 == MKTAG('I', 'N', 'F', 'O'))
yading@11:                 ff_read_riff_info(s, size - 4);
yading@11:         }else if(!ret)
yading@11:             break;
yading@11: 
yading@11:         if (avio_seek(pb, next, SEEK_SET) < 0)
yading@11:             break; // something is wrong here
yading@11:     }
yading@11:  the_end:
yading@11:     avio_seek(pb, pos, SEEK_SET);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
yading@11: {
yading@11:     AVIStream *ast2 = st2->priv_data;
yading@11:     int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
yading@11:     av_free_packet(&ast2->sub_pkt);
yading@11:     if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
yading@11:         avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
yading@11:         ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
yading@11: }
yading@11: 
yading@11: static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
yading@11: {
yading@11:     AVIContext *avi = s->priv_data;
yading@11:     AVStream *st;
yading@11:     int i, index;
yading@11:     int64_t pos, pos_min;
yading@11:     AVIStream *ast;
yading@11: 
yading@11:     if (!avi->index_loaded) {
yading@11:         /* we only load the index on demand */
yading@11:         avi_load_index(s);
yading@11:         avi->index_loaded |= 1;
yading@11:     }
yading@11:     av_assert0(stream_index>= 0);
yading@11: 
yading@11:     st = s->streams[stream_index];
yading@11:     ast= st->priv_data;
yading@11:     index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
yading@11:     if (index<0) {
yading@11:         if (st->nb_index_entries > 0)
yading@11:             av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
yading@11:                    timestamp * FFMAX(ast->sample_size, 1),
yading@11:                    st->index_entries[0].timestamp,
yading@11:                    st->index_entries[st->nb_index_entries - 1].timestamp);
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     /* find the position */
yading@11:     pos = st->index_entries[index].pos;
yading@11:     timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
yading@11: 
yading@11:     av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
yading@11:             timestamp, index, st->index_entries[index].timestamp);
yading@11: 
yading@11:     if (CONFIG_DV_DEMUXER && avi->dv_demux) {
yading@11:         /* One and only one real stream for DV in AVI, and it has video  */
yading@11:         /* offsets. Calling with other stream indexes should have failed */
yading@11:         /* the av_index_search_timestamp call above.                     */
yading@11:         av_assert0(stream_index == 0);
yading@11: 
yading@11:         if(avio_seek(s->pb, pos, SEEK_SET) < 0)
yading@11:             return -1;
yading@11: 
yading@11:         /* Feed the DV video stream version of the timestamp to the */
yading@11:         /* DV demux so it can synthesize correct timestamps.        */
yading@11:         ff_dv_offset_reset(avi->dv_demux, timestamp);
yading@11: 
yading@11:         avi->stream_index= -1;
yading@11:         return 0;
yading@11:     }
yading@11: 
yading@11:     pos_min= pos;
yading@11:     for(i = 0; i < s->nb_streams; i++) {
yading@11:         AVStream *st2 = s->streams[i];
yading@11:         AVIStream *ast2 = st2->priv_data;
yading@11: 
yading@11:         ast2->packet_size=
yading@11:         ast2->remaining= 0;
yading@11: 
yading@11:         if (ast2->sub_ctx) {
yading@11:             seek_subtitle(st, st2, timestamp);
yading@11:             continue;
yading@11:         }
yading@11: 
yading@11:         if (st2->nb_index_entries <= 0)
yading@11:             continue;
yading@11: 
yading@11: //        av_assert1(st2->codec->block_align);
yading@11:         av_assert0((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
yading@11:         index = av_index_search_timestamp(
yading@11:                 st2,
yading@11:                 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
yading@11:                 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
yading@11:         if(index<0)
yading@11:             index=0;
yading@11:         ast2->seek_pos= st2->index_entries[index].pos;
yading@11:         pos_min= FFMIN(pos_min,ast2->seek_pos);
yading@11:     }
yading@11:     for(i = 0; i < s->nb_streams; i++) {
yading@11:         AVStream *st2 = s->streams[i];
yading@11:         AVIStream *ast2 = st2->priv_data;
yading@11: 
yading@11:         if (ast2->sub_ctx || st2->nb_index_entries <= 0)
yading@11:             continue;
yading@11: 
yading@11:         index = av_index_search_timestamp(
yading@11:                 st2,
yading@11:                 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
yading@11:                 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
yading@11:         if(index<0)
yading@11:             index=0;
yading@11:         while(!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
yading@11:             index--;
yading@11:         ast2->frame_offset = st2->index_entries[index].timestamp;
yading@11:     }
yading@11: 
yading@11:     /* do the seek */
yading@11:     if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
yading@11:         av_log(s, AV_LOG_ERROR, "Seek failed\n");
yading@11:         return -1;
yading@11:     }
yading@11:     avi->stream_index= -1;
yading@11:     avi->dts_max= INT_MIN;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int avi_read_close(AVFormatContext *s)
yading@11: {
yading@11:     int i;
yading@11:     AVIContext *avi = s->priv_data;
yading@11: 
yading@11:     for(i=0;i<s->nb_streams;i++) {
yading@11:         AVStream *st = s->streams[i];
yading@11:         AVIStream *ast = st->priv_data;
yading@11:         if (ast) {
yading@11:             if (ast->sub_ctx) {
yading@11:                 av_freep(&ast->sub_ctx->pb);
yading@11:                 avformat_close_input(&ast->sub_ctx);
yading@11:             }
yading@11:             av_free(ast->sub_buffer);
yading@11:             av_free_packet(&ast->sub_pkt);
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     av_free(avi->dv_demux);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int avi_probe(AVProbeData *p)
yading@11: {
yading@11:     int i;
yading@11: 
yading@11:     /* check file header */
yading@11:     for(i=0; avi_headers[i][0]; i++)
yading@11:         if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
yading@11:            !memcmp(p->buf+8, avi_headers[i]+4, 4))
yading@11:             return AVPROBE_SCORE_MAX;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_avi_demuxer = {
yading@11:     .name           = "avi",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
yading@11:     .priv_data_size = sizeof(AVIContext),
yading@11:     .read_probe     = avi_probe,
yading@11:     .read_header    = avi_read_header,
yading@11:     .read_packet    = avi_read_packet,
yading@11:     .read_close     = avi_read_close,
yading@11:     .read_seek      = avi_read_seek,
yading@11:     .priv_class = &demuxer_class,
yading@11: };