yading@11: /*
yading@11:  * NSV demuxer
yading@11:  * Copyright (c) 2004 The FFmpeg Project
yading@11:  *
yading@11:  * first version by Francois Revol <revol@free.fr>
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/attributes.h"
yading@11: #include "libavutil/mathematics.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "libavutil/dict.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: 
yading@11: //#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!!
yading@11: #define CHECK_SUBSEQUENT_NSVS
yading@11: //#define DISABLE_AUDIO
yading@11: 
yading@11: /* max bytes to crawl for trying to resync
yading@11:  * stupid streaming servers don't start at chunk boundaries...
yading@11:  */
yading@11: #define NSV_MAX_RESYNC (500*1024)
yading@11: #define NSV_MAX_RESYNC_TRIES 300
yading@11: 
yading@11: /*
yading@11:  * References:
yading@11:  * (1) http://www.multimedia.cx/nsv-format.txt
yading@11:  * seems someone came to the same conclusions as me, and updated it:
yading@11:  * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
yading@11:  *     http://www.stud.ktu.lt/~vitslav/nsv/
yading@11:  * official docs
yading@11:  * (3) http://ultravox.aol.com/NSVFormat.rtf
yading@11:  * Sample files:
yading@11:  * (S1) http://www.nullsoft.com/nsv/samples/
yading@11:  * http://www.nullsoft.com/nsv/samples/faster.nsv
yading@11:  * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
yading@11:  */
yading@11: 
yading@11: /*
yading@11:  * notes on the header (Francois Revol):
yading@11:  *
yading@11:  * It is followed by strings, then a table, but nothing tells
yading@11:  * where the table begins according to (1). After checking faster.nsv,
yading@11:  * I believe NVSf[16-19] gives the size of the strings data
yading@11:  * (that is the offset of the data table after the header).
yading@11:  * After checking all samples from (S1) all confirms this.
yading@11:  *
yading@11:  * Then, about NSVf[12-15], faster.nsf has 179700. When veiwing it in VLC,
yading@11:  * I noticed there was about 1 NVSs chunk/s, so I ran
yading@11:  * strings faster.nsv | grep NSVs | wc -l
yading@11:  * which gave me 180. That leads me to think that NSVf[12-15] might be the
yading@11:  * file length in milliseconds.
yading@11:  * Let's try that:
yading@11:  * for f in *.nsv; do HTIME="$(od -t x4 "$f" | head -1 | sed 's/.* //')"; echo "'$f' $((0x$HTIME))s = $((0x$HTIME/1000/60)):$((0x$HTIME/1000%60))"; done
yading@11:  * except for nstrailer (which doesn't have an NSVf header), it repports correct time.
yading@11:  *
yading@11:  * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
yading@11:  * so the header seems to not be mandatory. (for streaming).
yading@11:  *
yading@11:  * index slice duration check (excepts nsvtrailer.nsv):
yading@11:  * for f in [^n]*.nsv; do DUR="$(ffmpeg -i "$f" 2>/dev/null | grep 'NSVf duration' | cut -d ' ' -f 4)"; IC="$(ffmpeg -i "$f" 2>/dev/null | grep 'INDEX ENTRIES' | cut -d ' ' -f 2)"; echo "duration $DUR, slite time $(($DUR/$IC))"; done
yading@11:  */
yading@11: 
yading@11: /*
yading@11:  * TODO:
yading@11:  * - handle timestamps !!!
yading@11:  * - use index
yading@11:  * - mime-type in probe()
yading@11:  * - seek
yading@11:  */
yading@11: 
yading@11: #if 0
yading@11: struct NSVf_header {
yading@11:     uint32_t chunk_tag; /* 'NSVf' */
yading@11:     uint32_t chunk_size;
yading@11:     uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */
yading@11:     uint32_t file_length; //unknown1;  /* what about MSB of file_size ? */
yading@11:     uint32_t info_strings_size; /* size of the info strings */ //unknown2;
yading@11:     uint32_t table_entries;
yading@11:     uint32_t table_entries_used; /* the left ones should be -1 */
yading@11: };
yading@11: 
yading@11: struct NSVs_header {
yading@11:     uint32_t chunk_tag; /* 'NSVs' */
yading@11:     uint32_t v4cc;      /* or 'NONE' */
yading@11:     uint32_t a4cc;      /* or 'NONE' */
yading@11:     uint16_t vwidth;    /* av_assert(vwidth%16==0) */
yading@11:     uint16_t vheight;   /* av_assert(vheight%16==0) */
yading@11:     uint8_t framerate;  /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
yading@11:     uint16_t unknown;
yading@11: };
yading@11: 
yading@11: struct nsv_avchunk_header {
yading@11:     uint8_t vchunk_size_lsb;
yading@11:     uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
yading@11:     uint16_t achunk_size;
yading@11: };
yading@11: 
yading@11: struct nsv_pcm_header {
yading@11:     uint8_t bits_per_sample;
yading@11:     uint8_t channel_count;
yading@11:     uint16_t sample_rate;
yading@11: };
yading@11: #endif
yading@11: 
yading@11: /* variation from avi.h */
yading@11: /*typedef struct CodecTag {
yading@11:     int id;
yading@11:     unsigned int tag;
yading@11: } CodecTag;*/
yading@11: 
yading@11: /* tags */
yading@11: 
yading@11: #define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
yading@11: #define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
yading@11: #define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
yading@11: #define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
yading@11: #define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
yading@11: #define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
yading@11: #define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
yading@11: 
yading@11: #define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
yading@11: #define TB_NSVS MKBETAG('N', 'S', 'V', 's')
yading@11: 
yading@11: /* hardcoded stream indexes */
yading@11: #define NSV_ST_VIDEO 0
yading@11: #define NSV_ST_AUDIO 1
yading@11: #define NSV_ST_SUBT 2
yading@11: 
yading@11: enum NSVStatus {
yading@11:     NSV_UNSYNC,
yading@11:     NSV_FOUND_NSVF,
yading@11:     NSV_HAS_READ_NSVF,
yading@11:     NSV_FOUND_NSVS,
yading@11:     NSV_HAS_READ_NSVS,
yading@11:     NSV_FOUND_BEEF,
yading@11:     NSV_GOT_VIDEO,
yading@11:     NSV_GOT_AUDIO,
yading@11: };
yading@11: 
yading@11: typedef struct NSVStream {
yading@11:     int frame_offset; /* current frame (video) or byte (audio) counter
yading@11:                          (used to compute the pts) */
yading@11:     int scale;
yading@11:     int rate;
yading@11:     int sample_size; /* audio only data */
yading@11:     int start;
yading@11: 
yading@11:     int new_frame_offset; /* temporary storage (used during seek) */
yading@11:     int cum_len; /* temporary storage (used during seek) */
yading@11: } NSVStream;
yading@11: 
yading@11: typedef struct {
yading@11:     int  base_offset;
yading@11:     int  NSVf_end;
yading@11:     uint32_t *nsvs_file_offset;
yading@11:     int index_entries;
yading@11:     enum NSVStatus state;
yading@11:     AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
yading@11:     /* cached */
yading@11:     int64_t duration;
yading@11:     uint32_t vtag, atag;
yading@11:     uint16_t vwidth, vheight;
yading@11:     int16_t avsync;
yading@11:     AVRational framerate;
yading@11:     uint32_t *nsvs_timestamps;
yading@11:     //DVDemuxContext* dv_demux;
yading@11: } NSVContext;
yading@11: 
yading@11: static const AVCodecTag nsv_codec_video_tags[] = {
yading@11:     { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
yading@11:     { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
yading@11:     { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
yading@11:     { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
yading@11:     { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
yading@11:     { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
yading@11:     { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
yading@11:     { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
yading@11:     { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
yading@11:     { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
yading@11: /*
yading@11:     { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
yading@11:     { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
yading@11: */
yading@11:     { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
yading@11:     { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
yading@11:     { AV_CODEC_ID_NONE, 0 },
yading@11: };
yading@11: 
yading@11: static const AVCodecTag nsv_codec_audio_tags[] = {
yading@11:     { AV_CODEC_ID_MP3,       MKTAG('M', 'P', '3', ' ') },
yading@11:     { AV_CODEC_ID_AAC,       MKTAG('A', 'A', 'C', ' ') },
yading@11:     { AV_CODEC_ID_AAC,       MKTAG('A', 'A', 'C', 'P') },
yading@11:     { AV_CODEC_ID_AAC,       MKTAG('V', 'L', 'B', ' ') },
yading@11:     { AV_CODEC_ID_SPEEX,     MKTAG('S', 'P', 'X', ' ') },
yading@11:     { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
yading@11:     { AV_CODEC_ID_NONE,      0 },
yading@11: };
yading@11: 
yading@11: //static int nsv_load_index(AVFormatContext *s);
yading@11: static int nsv_read_chunk(AVFormatContext *s, int fill_header);
yading@11: 
yading@11: #define print_tag(str, tag, size)       \
yading@11:     av_dlog(NULL, "%s: tag=%c%c%c%c\n", \
yading@11:             str, tag & 0xff,            \
yading@11:             (tag >> 8) & 0xff,          \
yading@11:             (tag >> 16) & 0xff,         \
yading@11:             (tag >> 24) & 0xff);
yading@11: 
yading@11: /* try to find something we recognize, and set the state accordingly */
yading@11: static int nsv_resync(AVFormatContext *s)
yading@11: {
yading@11:     NSVContext *nsv = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     uint32_t v = 0;
yading@11:     int i;
yading@11: 
yading@11:     av_dlog(s, "%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, avio_tell(pb), nsv->state);
yading@11: 
yading@11:     //nsv->state = NSV_UNSYNC;
yading@11: 
yading@11:     for (i = 0; i < NSV_MAX_RESYNC; i++) {
yading@11:         if (url_feof(pb)) {
yading@11:             av_dlog(s, "NSV EOF\n");
yading@11:             nsv->state = NSV_UNSYNC;
yading@11:             return -1;
yading@11:         }
yading@11:         v <<= 8;
yading@11:         v |= avio_r8(pb);
yading@11:         if (i < 8) {
yading@11:             av_dlog(s, "NSV resync: [%d] = %02x\n", i, v & 0x0FF);
yading@11:         }
yading@11: 
yading@11:         if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
yading@11:             av_dlog(s, "NSV resynced on BEEF after %d bytes\n", i+1);
yading@11:             nsv->state = NSV_FOUND_BEEF;
yading@11:             return 0;
yading@11:         }
yading@11:         /* we read as big-endian, thus the MK*BE* */
yading@11:         if (v == TB_NSVF) { /* NSVf */
yading@11:             av_dlog(s, "NSV resynced on NSVf after %d bytes\n", i+1);
yading@11:             nsv->state = NSV_FOUND_NSVF;
yading@11:             return 0;
yading@11:         }
yading@11:         if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
yading@11:             av_dlog(s, "NSV resynced on NSVs after %d bytes\n", i+1);
yading@11:             nsv->state = NSV_FOUND_NSVS;
yading@11:             return 0;
yading@11:         }
yading@11: 
yading@11:     }
yading@11:     av_dlog(s, "NSV sync lost\n");
yading@11:     return -1;
yading@11: }
yading@11: 
yading@11: static int nsv_parse_NSVf_header(AVFormatContext *s)
yading@11: {
yading@11:     NSVContext *nsv = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     unsigned int av_unused file_size;
yading@11:     unsigned int size;
yading@11:     int64_t duration;
yading@11:     int strings_size;
yading@11:     int table_entries;
yading@11:     int table_entries_used;
yading@11: 
yading@11:     av_dlog(s, "%s()\n", __FUNCTION__);
yading@11: 
yading@11:     nsv->state = NSV_UNSYNC; /* in case we fail */
yading@11: 
yading@11:     size = avio_rl32(pb);
yading@11:     if (size < 28)
yading@11:         return -1;
yading@11:     nsv->NSVf_end = size;
yading@11: 
yading@11:     //s->file_size = (uint32_t)avio_rl32(pb);
yading@11:     file_size = (uint32_t)avio_rl32(pb);
yading@11:     av_dlog(s, "NSV NSVf chunk_size %u\n", size);
yading@11:     av_dlog(s, "NSV NSVf file_size %u\n", file_size);
yading@11: 
yading@11:     nsv->duration = duration = avio_rl32(pb); /* in ms */
yading@11:     av_dlog(s, "NSV NSVf duration %"PRId64" ms\n", duration);
yading@11:     // XXX: store it in AVStreams
yading@11: 
yading@11:     strings_size = avio_rl32(pb);
yading@11:     table_entries = avio_rl32(pb);
yading@11:     table_entries_used = avio_rl32(pb);
yading@11:     av_dlog(s, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
yading@11:             strings_size, table_entries, table_entries_used);
yading@11:     if (url_feof(pb))
yading@11:         return -1;
yading@11: 
yading@11:     av_dlog(s, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
yading@11: 
yading@11:     if (strings_size > 0) {
yading@11:         char *strings; /* last byte will be '\0' to play safe with str*() */
yading@11:         char *p, *endp;
yading@11:         char *token, *value;
yading@11:         char quote;
yading@11: 
yading@11:         p = strings = av_mallocz((size_t)strings_size + 1);
yading@11:         if (!p)
yading@11:             return AVERROR(ENOMEM);
yading@11:         endp = strings + strings_size;
yading@11:         avio_read(pb, strings, strings_size);
yading@11:         while (p < endp) {
yading@11:             while (*p == ' ')
yading@11:                 p++; /* strip out spaces */
yading@11:             if (p >= endp-2)
yading@11:                 break;
yading@11:             token = p;
yading@11:             p = strchr(p, '=');
yading@11:             if (!p || p >= endp-2)
yading@11:                 break;
yading@11:             *p++ = '\0';
yading@11:             quote = *p++;
yading@11:             value = p;
yading@11:             p = strchr(p, quote);
yading@11:             if (!p || p >= endp)
yading@11:                 break;
yading@11:             *p++ = '\0';
yading@11:             av_dlog(s, "NSV NSVf INFO: %s='%s'\n", token, value);
yading@11:             av_dict_set(&s->metadata, token, value, 0);
yading@11:         }
yading@11:         av_free(strings);
yading@11:     }
yading@11:     if (url_feof(pb))
yading@11:         return -1;
yading@11: 
yading@11:     av_dlog(s, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
yading@11: 
yading@11:     if (table_entries_used > 0) {
yading@11:         int i;
yading@11:         nsv->index_entries = table_entries_used;
yading@11:         if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
yading@11:             return -1;
yading@11:         nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t));
yading@11:         if (!nsv->nsvs_file_offset)
yading@11:             return AVERROR(ENOMEM);
yading@11: 
yading@11:         for(i=0;i<table_entries_used;i++)
yading@11:             nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
yading@11: 
yading@11:         if(table_entries > table_entries_used &&
yading@11:            avio_rl32(pb) == MKTAG('T','O','C','2')) {
yading@11:             nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t));
yading@11:             if (!nsv->nsvs_timestamps)
yading@11:                 return AVERROR(ENOMEM);
yading@11:             for(i=0;i<table_entries_used;i++) {
yading@11:                 nsv->nsvs_timestamps[i] = avio_rl32(pb);
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     av_dlog(s, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
yading@11: 
yading@11: #ifdef DEBUG_DUMP_INDEX
yading@11: #define V(v) ((v<0x20 || v > 127)?'.':v)
yading@11:     /* dump index */
yading@11:     av_dlog(s, "NSV %d INDEX ENTRIES:\n", table_entries);
yading@11:     av_dlog(s, "NSV [dataoffset][fileoffset]\n", table_entries);
yading@11:     for (i = 0; i < table_entries; i++) {
yading@11:         unsigned char b[8];
yading@11:         avio_seek(pb, size + nsv->nsvs_file_offset[i], SEEK_SET);
yading@11:         avio_read(pb, b, 8);
yading@11:         av_dlog(s, "NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
yading@11:            "%c%c%c%c%c%c%c%c\n",
yading@11:            nsv->nsvs_file_offset[i], size + nsv->nsvs_file_offset[i],
yading@11:            b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
yading@11:            V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) );
yading@11:     }
yading@11:     //avio_seek(pb, size, SEEK_SET); /* go back to end of header */
yading@11: #undef V
yading@11: #endif
yading@11: 
yading@11:     avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
yading@11: 
yading@11:     if (url_feof(pb))
yading@11:         return -1;
yading@11:     nsv->state = NSV_HAS_READ_NSVF;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int nsv_parse_NSVs_header(AVFormatContext *s)
yading@11: {
yading@11:     NSVContext *nsv = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     uint32_t vtag, atag;
yading@11:     uint16_t vwidth, vheight;
yading@11:     AVRational framerate;
yading@11:     int i;
yading@11:     AVStream *st;
yading@11:     NSVStream *nst;
yading@11:     av_dlog(s, "%s()\n", __FUNCTION__);
yading@11: 
yading@11:     vtag = avio_rl32(pb);
yading@11:     atag = avio_rl32(pb);
yading@11:     vwidth = avio_rl16(pb);
yading@11:     vheight = avio_rl16(pb);
yading@11:     i = avio_r8(pb);
yading@11: 
yading@11:     av_dlog(s, "NSV NSVs framerate code %2x\n", i);
yading@11:     if(i&0x80) { /* odd way of giving native framerates from docs */
yading@11:         int t=(i & 0x7F)>>2;
yading@11:         if(t<16) framerate = (AVRational){1, t+1};
yading@11:         else     framerate = (AVRational){t-15, 1};
yading@11: 
yading@11:         if(i&1){
yading@11:             framerate.num *= 1000;
yading@11:             framerate.den *= 1001;
yading@11:         }
yading@11: 
yading@11:         if((i&3)==3)      framerate.num *= 24;
yading@11:         else if((i&3)==2) framerate.num *= 25;
yading@11:         else              framerate.num *= 30;
yading@11:     }
yading@11:     else
yading@11:         framerate= (AVRational){i, 1};
yading@11: 
yading@11:     nsv->avsync = avio_rl16(pb);
yading@11:     nsv->framerate = framerate;
yading@11: 
yading@11:     print_tag("NSV NSVs vtag", vtag, 0);
yading@11:     print_tag("NSV NSVs atag", atag, 0);
yading@11:     av_dlog(s, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
yading@11: 
yading@11:     /* XXX change to ap != NULL ? */
yading@11:     if (s->nb_streams == 0) { /* streams not yet published, let's do that */
yading@11:         nsv->vtag = vtag;
yading@11:         nsv->atag = atag;
yading@11:         nsv->vwidth = vwidth;
yading@11:         nsv->vheight = vwidth;
yading@11:         if (vtag != T_NONE) {
yading@11:             int i;
yading@11:             st = avformat_new_stream(s, NULL);
yading@11:             if (!st)
yading@11:                 goto fail;
yading@11: 
yading@11:             st->id = NSV_ST_VIDEO;
yading@11:             nst = av_mallocz(sizeof(NSVStream));
yading@11:             if (!nst)
yading@11:                 goto fail;
yading@11:             st->priv_data = nst;
yading@11:             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:             st->codec->codec_tag = vtag;
yading@11:             st->codec->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
yading@11:             st->codec->width = vwidth;
yading@11:             st->codec->height = vheight;
yading@11:             st->codec->bits_per_coded_sample = 24; /* depth XXX */
yading@11: 
yading@11:             avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
yading@11:             st->start_time = 0;
yading@11:             st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
yading@11: 
yading@11:             for(i=0;i<nsv->index_entries;i++) {
yading@11:                 if(nsv->nsvs_timestamps) {
yading@11:                     av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i],
yading@11:                                        0, 0, AVINDEX_KEYFRAME);
yading@11:                 } else {
yading@11:                     int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
yading@11:                     av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
yading@11:                 }
yading@11:             }
yading@11:         }
yading@11:         if (atag != T_NONE) {
yading@11: #ifndef DISABLE_AUDIO
yading@11:             st = avformat_new_stream(s, NULL);
yading@11:             if (!st)
yading@11:                 goto fail;
yading@11: 
yading@11:             st->id = NSV_ST_AUDIO;
yading@11:             nst = av_mallocz(sizeof(NSVStream));
yading@11:             if (!nst)
yading@11:                 goto fail;
yading@11:             st->priv_data = nst;
yading@11:             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:             st->codec->codec_tag = atag;
yading@11:             st->codec->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
yading@11: 
yading@11:             st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
yading@11: 
yading@11:             /* set timebase to common denominator of ms and framerate */
yading@11:             avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
yading@11:             st->start_time = 0;
yading@11:             st->duration = (int64_t)nsv->duration * framerate.num;
yading@11: #endif
yading@11:         }
yading@11: #ifdef CHECK_SUBSEQUENT_NSVS
yading@11:     } else {
yading@11:         if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
yading@11:             av_dlog(s, "NSV NSVs header values differ from the first one!!!\n");
yading@11:             //return -1;
yading@11:         }
yading@11: #endif /* CHECK_SUBSEQUENT_NSVS */
yading@11:     }
yading@11: 
yading@11:     nsv->state = NSV_HAS_READ_NSVS;
yading@11:     return 0;
yading@11: fail:
yading@11:     /* XXX */
yading@11:     nsv->state = NSV_UNSYNC;
yading@11:     return -1;
yading@11: }
yading@11: 
yading@11: static int nsv_read_header(AVFormatContext *s)
yading@11: {
yading@11:     NSVContext *nsv = s->priv_data;
yading@11:     int i, err;
yading@11: 
yading@11:     av_dlog(s, "%s()\n", __FUNCTION__);
yading@11:     av_dlog(s, "filename '%s'\n", s->filename);
yading@11: 
yading@11:     nsv->state = NSV_UNSYNC;
yading@11:     nsv->ahead[0].data = nsv->ahead[1].data = NULL;
yading@11: 
yading@11:     for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
yading@11:         if (nsv_resync(s) < 0)
yading@11:             return -1;
yading@11:         if (nsv->state == NSV_FOUND_NSVF) {
yading@11:             err = nsv_parse_NSVf_header(s);
yading@11:             if (err < 0)
yading@11:                 return err;
yading@11:         }
yading@11:             /* we need the first NSVs also... */
yading@11:         if (nsv->state == NSV_FOUND_NSVS) {
yading@11:             err = nsv_parse_NSVs_header(s);
yading@11:             if (err < 0)
yading@11:                 return err;
yading@11:             break; /* we just want the first one */
yading@11:         }
yading@11:     }
yading@11:     if (s->nb_streams < 1) /* no luck so far */
yading@11:         return -1;
yading@11:     /* now read the first chunk, so we can attempt to decode more info */
yading@11:     err = nsv_read_chunk(s, 1);
yading@11: 
yading@11:     av_dlog(s, "parsed header\n");
yading@11:     return err;
yading@11: }
yading@11: 
yading@11: static int nsv_read_chunk(AVFormatContext *s, int fill_header)
yading@11: {
yading@11:     NSVContext *nsv = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVStream *st[2] = {NULL, NULL};
yading@11:     NSVStream *nst;
yading@11:     AVPacket *pkt;
yading@11:     int i, err = 0;
yading@11:     uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
yading@11:     uint32_t vsize;
yading@11:     uint16_t asize;
yading@11:     uint16_t auxsize;
yading@11: 
yading@11:     av_dlog(s, "%s(%d)\n", __FUNCTION__, fill_header);
yading@11: 
yading@11:     if (nsv->ahead[0].data || nsv->ahead[1].data)
yading@11:         return 0; //-1; /* hey! eat what you've in your plate first! */
yading@11: 
yading@11: null_chunk_retry:
yading@11:     if (url_feof(pb))
yading@11:         return -1;
yading@11: 
yading@11:     for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
yading@11:         err = nsv_resync(s);
yading@11:     if (err < 0)
yading@11:         return err;
yading@11:     if (nsv->state == NSV_FOUND_NSVS)
yading@11:         err = nsv_parse_NSVs_header(s);
yading@11:     if (err < 0)
yading@11:         return err;
yading@11:     if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
yading@11:         return -1;
yading@11: 
yading@11:     auxcount = avio_r8(pb);
yading@11:     vsize = avio_rl16(pb);
yading@11:     asize = avio_rl16(pb);
yading@11:     vsize = (vsize << 4) | (auxcount >> 4);
yading@11:     auxcount &= 0x0f;
yading@11:     av_dlog(s, "NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize);
yading@11:     /* skip aux stuff */
yading@11:     for (i = 0; i < auxcount; i++) {
yading@11:         uint32_t av_unused auxtag;
yading@11:         auxsize = avio_rl16(pb);
yading@11:         auxtag = avio_rl32(pb);
yading@11:         av_dlog(s, "NSV aux data: '%c%c%c%c', %d bytes\n",
yading@11:               (auxtag & 0x0ff),
yading@11:               ((auxtag >> 8) & 0x0ff),
yading@11:               ((auxtag >> 16) & 0x0ff),
yading@11:               ((auxtag >> 24) & 0x0ff),
yading@11:               auxsize);
yading@11:         avio_skip(pb, auxsize);
yading@11:         vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
yading@11:     }
yading@11: 
yading@11:     if (url_feof(pb))
yading@11:         return -1;
yading@11:     if (!vsize && !asize) {
yading@11:         nsv->state = NSV_UNSYNC;
yading@11:         goto null_chunk_retry;
yading@11:     }
yading@11: 
yading@11:     /* map back streams to v,a */
yading@11:     if (s->nb_streams > 0)
yading@11:         st[s->streams[0]->id] = s->streams[0];
yading@11:     if (s->nb_streams > 1)
yading@11:         st[s->streams[1]->id] = s->streams[1];
yading@11: 
yading@11:     if (vsize && st[NSV_ST_VIDEO]) {
yading@11:         nst = st[NSV_ST_VIDEO]->priv_data;
yading@11:         pkt = &nsv->ahead[NSV_ST_VIDEO];
yading@11:         av_get_packet(pb, pkt, vsize);
yading@11:         pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
yading@11:         pkt->dts = nst->frame_offset;
yading@11:         pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
yading@11:         for (i = 0; i < FFMIN(8, vsize); i++)
yading@11:             av_dlog(s, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
yading@11:     }
yading@11:     if(st[NSV_ST_VIDEO])
yading@11:         ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
yading@11: 
yading@11:     if (asize && st[NSV_ST_AUDIO]) {
yading@11:         nst = st[NSV_ST_AUDIO]->priv_data;
yading@11:         pkt = &nsv->ahead[NSV_ST_AUDIO];
yading@11:         /* read raw audio specific header on the first audio chunk... */
yading@11:         /* on ALL audio chunks ?? seems so! */
yading@11:         if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
yading@11:             uint8_t bps;
yading@11:             uint8_t channels;
yading@11:             uint16_t samplerate;
yading@11:             bps = avio_r8(pb);
yading@11:             channels = avio_r8(pb);
yading@11:             samplerate = avio_rl16(pb);
yading@11:             asize-=4;
yading@11:             av_dlog(s, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
yading@11:             if (fill_header) {
yading@11:                 st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
yading@11:                 if (bps != 16) {
yading@11:                     av_dlog(s, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps);
yading@11:                 }
yading@11:                 if(channels)
yading@11:                     bps /= channels; // ???
yading@11:                 else
yading@11:                     av_log(s, AV_LOG_WARNING, "Channels is 0\n");
yading@11:                 if (bps == 8)
yading@11:                     st[NSV_ST_AUDIO]->codec->codec_id = AV_CODEC_ID_PCM_U8;
yading@11:                 samplerate /= 4;/* UGH ??? XXX */
yading@11:                 channels = 1;
yading@11:                 st[NSV_ST_AUDIO]->codec->channels = channels;
yading@11:                 st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
yading@11:                 av_dlog(s, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
yading@11:             }
yading@11:         }
yading@11:         av_get_packet(pb, pkt, asize);
yading@11:         pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
yading@11:         pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
yading@11:         if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
yading@11:             /* on a nsvs frame we have new information on a/v sync */
yading@11:             pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
yading@11:             pkt->dts *= (int64_t)1000        * nsv->framerate.den;
yading@11:             pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
yading@11:             av_dlog(s, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
yading@11:         }
yading@11:         nst->frame_offset++;
yading@11:     }
yading@11: 
yading@11:     nsv->state = NSV_UNSYNC;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: 
yading@11: static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     NSVContext *nsv = s->priv_data;
yading@11:     int i, err = 0;
yading@11: 
yading@11:     av_dlog(s, "%s()\n", __FUNCTION__);
yading@11: 
yading@11:     /* in case we don't already have something to eat ... */
yading@11:     if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
yading@11:         err = nsv_read_chunk(s, 0);
yading@11:     if (err < 0)
yading@11:         return err;
yading@11: 
yading@11:     /* now pick one of the plates */
yading@11:     for (i = 0; i < 2; i++) {
yading@11:         if (nsv->ahead[i].data) {
yading@11:             av_dlog(s, "%s: using cached packet[%d]\n", __FUNCTION__, i);
yading@11:             /* avoid the cost of new_packet + memcpy(->data) */
yading@11:             memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
yading@11:             nsv->ahead[i].data = NULL; /* we ate that one */
yading@11:             return pkt->size;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     /* this restaurant is not approvisionned :^] */
yading@11:     return -1;
yading@11: }
yading@11: 
yading@11: static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
yading@11: {
yading@11:     NSVContext *nsv = s->priv_data;
yading@11:     AVStream *st = s->streams[stream_index];
yading@11:     NSVStream *nst = st->priv_data;
yading@11:     int index;
yading@11: 
yading@11:     index = av_index_search_timestamp(st, timestamp, flags);
yading@11:     if(index < 0)
yading@11:         return -1;
yading@11: 
yading@11:     if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
yading@11:         return -1;
yading@11: 
yading@11:     nst->frame_offset = st->index_entries[index].timestamp;
yading@11:     nsv->state = NSV_UNSYNC;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int nsv_read_close(AVFormatContext *s)
yading@11: {
yading@11: /*     int i; */
yading@11:     NSVContext *nsv = s->priv_data;
yading@11: 
yading@11:     av_freep(&nsv->nsvs_file_offset);
yading@11:     av_freep(&nsv->nsvs_timestamps);
yading@11:     if (nsv->ahead[0].data)
yading@11:         av_free_packet(&nsv->ahead[0]);
yading@11:     if (nsv->ahead[1].data)
yading@11:         av_free_packet(&nsv->ahead[1]);
yading@11: 
yading@11: #if 0
yading@11: 
yading@11:     for(i=0;i<s->nb_streams;i++) {
yading@11:         AVStream *st = s->streams[i];
yading@11:         NSVStream *ast = st->priv_data;
yading@11:         if(ast){
yading@11:             av_free(ast->index_entries);
yading@11:             av_free(ast);
yading@11:         }
yading@11:         av_free(st->codec->palctrl);
yading@11:     }
yading@11: 
yading@11: #endif
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int nsv_probe(AVProbeData *p)
yading@11: {
yading@11:     int i, score = 0;
yading@11: 
yading@11:     av_dlog(NULL, "nsv_probe(), buf_size %d\n", p->buf_size);
yading@11:     /* check file header */
yading@11:     /* streamed files might not have any header */
yading@11:     if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
yading@11:         p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     /* XXX: do streamed files always start at chunk boundary ?? */
yading@11:     /* or do we need to search NSVs in the byte stream ? */
yading@11:     /* seems the servers don't bother starting clean chunks... */
yading@11:     /* sometimes even the first header is at 9KB or something :^) */
yading@11:     for (i = 1; i < p->buf_size - 3; i++) {
yading@11:         if (AV_RL32(p->buf + i) == AV_RL32("NSVs")) {
yading@11:             /* Get the chunk size and check if at the end we are getting 0xBEEF */
yading@11:             int vsize = AV_RL24(p->buf+i+19) >> 4;
yading@11:             int asize = AV_RL16(p->buf+i+22);
yading@11:             int offset = i + 23 + asize + vsize + 1;
yading@11:             if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF)
yading@11:                 return 4*AVPROBE_SCORE_MAX/5;
yading@11:             score = AVPROBE_SCORE_MAX/5;
yading@11:         }
yading@11:     }
yading@11:     /* so we'll have more luck on extension... */
yading@11:     if (av_match_ext(p->filename, "nsv"))
yading@11:         return AVPROBE_SCORE_MAX/2;
yading@11:     /* FIXME: add mime-type check */
yading@11:     return score;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_nsv_demuxer = {
yading@11:     .name           = "nsv",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
yading@11:     .priv_data_size = sizeof(NSVContext),
yading@11:     .read_probe     = nsv_probe,
yading@11:     .read_header    = nsv_read_header,
yading@11:     .read_packet    = nsv_read_packet,
yading@11:     .read_close     = nsv_read_close,
yading@11:     .read_seek      = nsv_read_seek,
yading@11: };