yading@11: /*
yading@11:  * Sierra VMD Format Demuxer
yading@11:  * Copyright (c) 2004 The ffmpeg Project
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: /**
yading@11:  * @file
yading@11:  * Sierra VMD file demuxer
yading@11:  * by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
yading@11:  * for more information on the Sierra VMD file format, visit:
yading@11:  *   http://www.pcisys.net/~melanson/codecs/
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "avio_internal.h"
yading@11: 
yading@11: #define VMD_HEADER_SIZE 0x0330
yading@11: #define BYTES_PER_FRAME_RECORD 16
yading@11: 
yading@11: typedef struct {
yading@11:   int stream_index;
yading@11:   int64_t frame_offset;
yading@11:   unsigned int frame_size;
yading@11:   int64_t pts;
yading@11:   int keyframe;
yading@11:   unsigned char frame_record[BYTES_PER_FRAME_RECORD];
yading@11: } vmd_frame;
yading@11: 
yading@11: typedef struct VmdDemuxContext {
yading@11:     int video_stream_index;
yading@11:     int audio_stream_index;
yading@11: 
yading@11:     unsigned int frame_count;
yading@11:     unsigned int frames_per_block;
yading@11:     vmd_frame *frame_table;
yading@11:     unsigned int current_frame;
yading@11:     int is_indeo3;
yading@11: 
yading@11:     int sample_rate;
yading@11:     int64_t audio_sample_counter;
yading@11:     int skiphdr;
yading@11: 
yading@11:     unsigned char vmd_header[VMD_HEADER_SIZE];
yading@11: } VmdDemuxContext;
yading@11: 
yading@11: static int vmd_probe(AVProbeData *p)
yading@11: {
yading@11:     int w, h;
yading@11:     if (p->buf_size < 16)
yading@11:         return 0;
yading@11:     /* check if the first 2 bytes of the file contain the appropriate size
yading@11:      * of a VMD header chunk */
yading@11:     if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
yading@11:         return 0;
yading@11:     w = AV_RL16(&p->buf[12]);
yading@11:     h = AV_RL16(&p->buf[14]);
yading@11:     if (!w || w > 2048 || !h || h > 2048)
yading@11:         return 0;
yading@11: 
yading@11:     /* only return half certainty since this check is a bit sketchy */
yading@11:     return AVPROBE_SCORE_MAX / 2;
yading@11: }
yading@11: 
yading@11: static int vmd_read_header(AVFormatContext *s)
yading@11: {
yading@11:     VmdDemuxContext *vmd = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVStream *st = NULL, *vst;
yading@11:     unsigned int toc_offset;
yading@11:     unsigned char *raw_frame_table;
yading@11:     int raw_frame_table_size;
yading@11:     int64_t current_offset;
yading@11:     int i, j;
yading@11:     unsigned int total_frames;
yading@11:     int64_t current_audio_pts = 0;
yading@11:     unsigned char chunk[BYTES_PER_FRAME_RECORD];
yading@11:     int num, den;
yading@11:     int sound_buffers;
yading@11: 
yading@11:     /* fetch the main header, including the 2 header length bytes */
yading@11:     avio_seek(pb, 0, SEEK_SET);
yading@11:     if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
yading@11:         return AVERROR(EIO);
yading@11: 
yading@11:     if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3')
yading@11:         vmd->is_indeo3 = 1;
yading@11:     else
yading@11:         vmd->is_indeo3 = 0;
yading@11:     /* start up the decoders */
yading@11:     vst = avformat_new_stream(s, NULL);
yading@11:     if (!vst)
yading@11:         return AVERROR(ENOMEM);
yading@11:     avpriv_set_pts_info(vst, 33, 1, 10);
yading@11:     vmd->video_stream_index = vst->index;
yading@11:     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     vst->codec->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
yading@11:     vst->codec->codec_tag = 0;  /* no fourcc */
yading@11:     vst->codec->width = AV_RL16(&vmd->vmd_header[12]);
yading@11:     vst->codec->height = AV_RL16(&vmd->vmd_header[14]);
yading@11:     if(vmd->is_indeo3 && vst->codec->width > 320){
yading@11:         vst->codec->width >>= 1;
yading@11:         vst->codec->height >>= 1;
yading@11:     }
yading@11:     vst->codec->extradata_size = VMD_HEADER_SIZE;
yading@11:     vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:     memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
yading@11: 
yading@11:     /* if sample rate is 0, assume no audio */
yading@11:     vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
yading@11:     if (vmd->sample_rate) {
yading@11:         st = avformat_new_stream(s, NULL);
yading@11:         if (!st)
yading@11:             return AVERROR(ENOMEM);
yading@11:         vmd->audio_stream_index = st->index;
yading@11:         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:         st->codec->codec_id = AV_CODEC_ID_VMDAUDIO;
yading@11:         st->codec->codec_tag = 0;  /* no fourcc */
yading@11:         if (vmd->vmd_header[811] & 0x80) {
yading@11:             st->codec->channels       = 2;
yading@11:             st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
yading@11:         } else {
yading@11:             st->codec->channels       = 1;
yading@11:             st->codec->channel_layout = AV_CH_LAYOUT_MONO;
yading@11:         }
yading@11:         st->codec->sample_rate = vmd->sample_rate;
yading@11:         st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
yading@11:         if (st->codec->block_align & 0x8000) {
yading@11:             st->codec->bits_per_coded_sample = 16;
yading@11:             st->codec->block_align = -(st->codec->block_align - 0x10000);
yading@11:         } else {
yading@11:             st->codec->bits_per_coded_sample = 8;
yading@11:         }
yading@11:         st->codec->bit_rate = st->codec->sample_rate *
yading@11:             st->codec->bits_per_coded_sample * st->codec->channels;
yading@11: 
yading@11:         /* calculate pts */
yading@11:         num = st->codec->block_align;
yading@11:         den = st->codec->sample_rate * st->codec->channels;
yading@11:         av_reduce(&num, &den, num, den, (1UL<<31)-1);
yading@11:         avpriv_set_pts_info(vst, 33, num, den);
yading@11:         avpriv_set_pts_info(st, 33, num, den);
yading@11:     }
yading@11: 
yading@11:     toc_offset = AV_RL32(&vmd->vmd_header[812]);
yading@11:     vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
yading@11:     vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
yading@11:     avio_seek(pb, toc_offset, SEEK_SET);
yading@11: 
yading@11:     raw_frame_table = NULL;
yading@11:     vmd->frame_table = NULL;
yading@11:     sound_buffers = AV_RL16(&vmd->vmd_header[808]);
yading@11:     raw_frame_table_size = vmd->frame_count * 6;
yading@11:     if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
yading@11:         av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
yading@11:         return -1;
yading@11:     }
yading@11:     raw_frame_table = av_malloc(raw_frame_table_size);
yading@11:     vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame));
yading@11:     if (!raw_frame_table || !vmd->frame_table) {
yading@11:         av_free(raw_frame_table);
yading@11:         av_free(vmd->frame_table);
yading@11:         return AVERROR(ENOMEM);
yading@11:     }
yading@11:     if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
yading@11:         raw_frame_table_size) {
yading@11:         av_free(raw_frame_table);
yading@11:         av_free(vmd->frame_table);
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11: 
yading@11:     total_frames = 0;
yading@11:     for (i = 0; i < vmd->frame_count; i++) {
yading@11: 
yading@11:         current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
yading@11: 
yading@11:         /* handle each entry in index block */
yading@11:         for (j = 0; j < vmd->frames_per_block; j++) {
yading@11:             int type;
yading@11:             uint32_t size;
yading@11: 
yading@11:             avio_read(pb, chunk, BYTES_PER_FRAME_RECORD);
yading@11:             type = chunk[0];
yading@11:             size = AV_RL32(&chunk[2]);
yading@11:             if(!size && type != 1)
yading@11:                 continue;
yading@11:             switch(type) {
yading@11:             case 1: /* Audio Chunk */
yading@11:                 if (!st) break;
yading@11:                 /* first audio chunk contains several audio buffers */
yading@11:                 vmd->frame_table[total_frames].frame_offset = current_offset;
yading@11:                 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
yading@11:                 vmd->frame_table[total_frames].frame_size = size;
yading@11:                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
yading@11:                 vmd->frame_table[total_frames].pts = current_audio_pts;
yading@11:                 total_frames++;
yading@11:                 if(!current_audio_pts)
yading@11:                     current_audio_pts += sound_buffers - 1;
yading@11:                 else
yading@11:                     current_audio_pts++;
yading@11:                 break;
yading@11:             case 2: /* Video Chunk */
yading@11:                 vmd->frame_table[total_frames].frame_offset = current_offset;
yading@11:                 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
yading@11:                 vmd->frame_table[total_frames].frame_size = size;
yading@11:                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
yading@11:                 vmd->frame_table[total_frames].pts = i;
yading@11:                 total_frames++;
yading@11:                 break;
yading@11:             }
yading@11:             current_offset += size;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     av_free(raw_frame_table);
yading@11: 
yading@11:     vmd->current_frame = 0;
yading@11:     vmd->frame_count = total_frames;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int vmd_read_packet(AVFormatContext *s,
yading@11:                            AVPacket *pkt)
yading@11: {
yading@11:     VmdDemuxContext *vmd = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int ret = 0;
yading@11:     vmd_frame *frame;
yading@11: 
yading@11:     if (vmd->current_frame >= vmd->frame_count)
yading@11:         return AVERROR_EOF;
yading@11: 
yading@11:     frame = &vmd->frame_table[vmd->current_frame];
yading@11:     /* position the stream (will probably be there already) */
yading@11:     avio_seek(pb, frame->frame_offset, SEEK_SET);
yading@11: 
yading@11:     if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
yading@11:         return AVERROR(EIO);
yading@11:     if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
yading@11:         return AVERROR(ENOMEM);
yading@11:     pkt->pos= avio_tell(pb);
yading@11:     memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
yading@11:     if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
yading@11:         ret = avio_read(pb, pkt->data, frame->frame_size);
yading@11:     else
yading@11:         ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
yading@11:             frame->frame_size);
yading@11: 
yading@11:     if (ret != frame->frame_size) {
yading@11:         av_free_packet(pkt);
yading@11:         ret = AVERROR(EIO);
yading@11:     }
yading@11:     pkt->stream_index = frame->stream_index;
yading@11:     pkt->pts = frame->pts;
yading@11:     av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
yading@11:             (frame->frame_record[0] == 0x02) ? "video" : "audio",
yading@11:             frame->frame_size + BYTES_PER_FRAME_RECORD,
yading@11:             pkt->pts);
yading@11: 
yading@11:     vmd->current_frame++;
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int vmd_read_close(AVFormatContext *s)
yading@11: {
yading@11:     VmdDemuxContext *vmd = s->priv_data;
yading@11: 
yading@11:     av_free(vmd->frame_table);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_vmd_demuxer = {
yading@11:     .name           = "vmd",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Sierra VMD"),
yading@11:     .priv_data_size = sizeof(VmdDemuxContext),
yading@11:     .read_probe     = vmd_probe,
yading@11:     .read_header    = vmd_read_header,
yading@11:     .read_packet    = vmd_read_packet,
yading@11:     .read_close     = vmd_read_close,
yading@11: };