libavformat/sierravmd.c - third_party/ffmpeg - Git at Google

 /*
  * Sierra VMD Format Demuxer
  * Copyright (c) 2004 The FFmpeg project
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 /**
  * @file
  * Sierra VMD file demuxer
  * by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
  * for more information on the Sierra VMD file format, visit:
  *   http://www.pcisys.net/~melanson/codecs/
  */

 #include "libavutil/channel_layout.h"
 #include "libavutil/intreadwrite.h"
 #include "avformat.h"
 #include "internal.h"
 #include "avio_internal.h"

 #define VMD_HEADER_SIZE 0x0330
 #define BYTES_PER_FRAME_RECORD 16

 typedef struct vmd_frame {
   int stream_index;
   int64_t frame_offset;
   unsigned int frame_size;
   int64_t pts;
   int keyframe;
   unsigned char frame_record[BYTES_PER_FRAME_RECORD];
 } vmd_frame;

 typedef struct VmdDemuxContext {
     int video_stream_index;
     int audio_stream_index;

     unsigned int frame_count;
     unsigned int frames_per_block;
     vmd_frame *frame_table;
     unsigned int current_frame;
     int is_indeo3;

     int sample_rate;
     int64_t audio_sample_counter;
     int skiphdr;

     unsigned char vmd_header[VMD_HEADER_SIZE];
 } VmdDemuxContext;

 static int vmd_probe(const AVProbeData *p)
 {
     int w, h, sample_rate;
     if (p->buf_size < 806)
         return 0;
     /* check if the first 2 bytes of the file contain the appropriate size
      * of a VMD header chunk */
     if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
         return 0;
     w = AV_RL16(&p->buf[12]);
     h = AV_RL16(&p->buf[14]);
     sample_rate = AV_RL16(&p->buf[804]);
     if ((!w || w > 2048 || !h || h > 2048) &&
         sample_rate != 22050)
         return 0;

     /* only return half certainty since this check is a bit sketchy */
     return AVPROBE_SCORE_EXTENSION;
 }

 static int vmd_read_header(AVFormatContext *s)
 {
     VmdDemuxContext *vmd = s->priv_data;
     AVIOContext *pb = s->pb;
     AVStream *st = NULL, *vst = NULL;
     unsigned int toc_offset;
     unsigned char *raw_frame_table;
     int raw_frame_table_size;
     int64_t current_offset;
     int i, j, ret;
     int width, height;
     unsigned int total_frames;
     int64_t current_audio_pts = 0;
     unsigned char chunk[BYTES_PER_FRAME_RECORD];
     int num, den;
     int sound_buffers;

     /* fetch the main header, including the 2 header length bytes */
     avio_seek(pb, 0, SEEK_SET);
     if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
         return AVERROR(EIO);

     width = AV_RL16(&vmd->vmd_header[12]);
     height = AV_RL16(&vmd->vmd_header[14]);
     if (width && height) {
         if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') {
             vmd->is_indeo3 = 1;
         } else {
             vmd->is_indeo3 = 0;
         }
         /* start up the decoders */
         vst = avformat_new_stream(s, NULL);
         if (!vst)
             return AVERROR(ENOMEM);
         avpriv_set_pts_info(vst, 33, 1, 10);
         vmd->video_stream_index = vst->index;
         vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
         vst->codecpar->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
         vst->codecpar->codec_tag = 0;  /* no fourcc */
         vst->codecpar->width = width;
         vst->codecpar->height = height;
         if(vmd->is_indeo3 && vst->codecpar->width > 320){
             vst->codecpar->width >>= 1;
             vst->codecpar->height >>= 1;
         }
         if ((ret = ff_alloc_extradata(vst->codecpar, VMD_HEADER_SIZE)) < 0)
             return ret;
         memcpy(vst->codecpar->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
     }

     /* if sample rate is 0, assume no audio */
     vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
     if (vmd->sample_rate) {
         st = avformat_new_stream(s, NULL);
         if (!st)
             return AVERROR(ENOMEM);
         vmd->audio_stream_index = st->index;
         st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
         st->codecpar->codec_id   = AV_CODEC_ID_VMDAUDIO;
         st->codecpar->codec_tag  = 0;  /* no fourcc */
         st->codecpar->sample_rate = vmd->sample_rate;
         st->codecpar->block_align = AV_RL16(&vmd->vmd_header[806]);
         if (st->codecpar->block_align & 0x8000) {
             st->codecpar->bits_per_coded_sample = 16;
             st->codecpar->block_align = -(st->codecpar->block_align - 0x10000);
         } else {
             st->codecpar->bits_per_coded_sample = 8;
         }
         if (vmd->vmd_header[811] & 0x80) {
             st->codecpar->channels       = 2;
             st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
         } else if (vmd->vmd_header[811] & 0x2) {
             /* Shivers 2 stereo audio */
             /* Frame length is for 1 channel */
             st->codecpar->channels       = 2;
             st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
             st->codecpar->block_align = st->codecpar->block_align << 1;
         } else {
             st->codecpar->channels       = 1;
             st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
         }
         st->codecpar->bit_rate = st->codecpar->sample_rate *
             st->codecpar->bits_per_coded_sample * st->codecpar->channels;

         /* calculate pts */
         num = st->codecpar->block_align;
         den = st->codecpar->sample_rate * st->codecpar->channels;
         av_reduce(&num, &den, num, den, (1UL<<31)-1);
         if (vst)
             avpriv_set_pts_info(vst, 33, num, den);
         avpriv_set_pts_info(st, 33, num, den);
     }

     toc_offset = AV_RL32(&vmd->vmd_header[812]);
     vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
     vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
     avio_seek(pb, toc_offset, SEEK_SET);

     raw_frame_table = NULL;
     vmd->frame_table = NULL;
     sound_buffers = AV_RL16(&vmd->vmd_header[808]);
     raw_frame_table_size = vmd->frame_count * 6;
     if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
         av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
         return -1;
     }
     raw_frame_table = av_malloc(raw_frame_table_size);
     vmd->frame_table = av_malloc_array(vmd->frame_count * vmd->frames_per_block + sound_buffers, sizeof(vmd_frame));
     if (!raw_frame_table || !vmd->frame_table) {
         ret = AVERROR(ENOMEM);
         goto error;
     }
     if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
         raw_frame_table_size) {
         ret = AVERROR(EIO);
         goto error;
     }

     total_frames = 0;
     for (i = 0; i < vmd->frame_count; i++) {

         current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);

         /* handle each entry in index block */
         for (j = 0; j < vmd->frames_per_block; j++) {
             int type;
             uint32_t size;

             if ((ret = avio_read(pb, chunk, BYTES_PER_FRAME_RECORD)) != BYTES_PER_FRAME_RECORD) {
                 av_log(s, AV_LOG_ERROR, "Failed to read frame record\n");
                 if (ret >= 0)
                     ret = AVERROR_INVALIDDATA;
                 goto error;
             }
             type = chunk[0];
             size = AV_RL32(&chunk[2]);
             if (size > INT_MAX / 2) {
                 av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
                 ret = AVERROR_INVALIDDATA;
                 goto error;
             }
             if(!size && type != 1)
                 continue;
             switch(type) {
             case 1: /* Audio Chunk */
                 if (!st) break;
                 /* first audio chunk contains several audio buffers */
                 vmd->frame_table[total_frames].frame_offset = current_offset;
                 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
                 vmd->frame_table[total_frames].frame_size = size;
                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
                 vmd->frame_table[total_frames].pts = current_audio_pts;
                 total_frames++;
                 if(!current_audio_pts)
                     current_audio_pts += sound_buffers - 1;
                 else
                     current_audio_pts++;
                 break;
             case 2: /* Video Chunk */
                 vmd->frame_table[total_frames].frame_offset = current_offset;
                 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
                 vmd->frame_table[total_frames].frame_size = size;
                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
                 vmd->frame_table[total_frames].pts = i;
                 total_frames++;
                 break;
             }
             current_offset += size;
         }
     }

     av_free(raw_frame_table);

     vmd->current_frame = 0;
     vmd->frame_count = total_frames;

     return 0;

 error:
     av_freep(&raw_frame_table);
     av_freep(&vmd->frame_table);
     return ret;
 }

 static int vmd_read_packet(AVFormatContext *s,
                            AVPacket *pkt)
 {
     VmdDemuxContext *vmd = s->priv_data;
     AVIOContext *pb = s->pb;
     int ret = 0;
     vmd_frame *frame;

     if (vmd->current_frame >= vmd->frame_count)
         return AVERROR_EOF;

     frame = &vmd->frame_table[vmd->current_frame];
     /* position the stream (will probably be there already) */
     avio_seek(pb, frame->frame_offset, SEEK_SET);

     if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
         return AVERROR(EIO);
     ret = av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD);
     if (ret < 0)
         return ret;
     pkt->pos= avio_tell(pb);
     memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
     if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
         ret = avio_read(pb, pkt->data, frame->frame_size);
     else
         ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
             frame->frame_size);

     if (ret != frame->frame_size) {
         ret = AVERROR(EIO);
     }
     pkt->stream_index = frame->stream_index;
     pkt->pts = frame->pts;
     av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
             (frame->frame_record[0] == 0x02) ? "video" : "audio",
             frame->frame_size + BYTES_PER_FRAME_RECORD,
             pkt->pts);

     vmd->current_frame++;

     return ret;
 }

 static int vmd_read_close(AVFormatContext *s)
 {
     VmdDemuxContext *vmd = s->priv_data;

     av_freep(&vmd->frame_table);

     return 0;
 }

 AVInputFormat ff_vmd_demuxer = {
     .name           = "vmd",
     .long_name      = NULL_IF_CONFIG_SMALL("Sierra VMD"),
     .priv_data_size = sizeof(VmdDemuxContext),
     .read_probe     = vmd_probe,
     .read_header    = vmd_read_header,
     .read_packet    = vmd_read_packet,
     .read_close     = vmd_read_close,
 };
	/*
	* Sierra VMD Format Demuxer
	* Copyright (c) 2004 The FFmpeg project
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* FFmpeg is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	/**
	* @file
	* Sierra VMD file demuxer
	* by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
	* for more information on the Sierra VMD file format, visit:
	* http://www.pcisys.net/~melanson/codecs/
	*/

	#include "libavutil/channel_layout.h"
	#include "libavutil/intreadwrite.h"
	#include "avformat.h"
	#include "internal.h"
	#include "avio_internal.h"

	#define VMD_HEADER_SIZE 0x0330
	#define BYTES_PER_FRAME_RECORD 16

	typedef struct vmd_frame {
	int stream_index;
	int64_t frame_offset;
	unsigned int frame_size;
	int64_t pts;
	int keyframe;
	unsigned char frame_record[BYTES_PER_FRAME_RECORD];
	} vmd_frame;

	typedef struct VmdDemuxContext {
	int video_stream_index;
	int audio_stream_index;

	unsigned int frame_count;
	unsigned int frames_per_block;
	vmd_frame *frame_table;
	unsigned int current_frame;
	int is_indeo3;

	int sample_rate;
	int64_t audio_sample_counter;
	int skiphdr;

	unsigned char vmd_header[VMD_HEADER_SIZE];
	} VmdDemuxContext;

	static int vmd_probe(const AVProbeData *p)
	{
	int w, h, sample_rate;
	if (p->buf_size < 806)
	return 0;
	/* check if the first 2 bytes of the file contain the appropriate size
	* of a VMD header chunk */
	if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
	return 0;
	w = AV_RL16(&p->buf[12]);
	h = AV_RL16(&p->buf[14]);
	sample_rate = AV_RL16(&p->buf[804]);
	if ((!w \|\| w > 2048 \|\| !h \|\| h > 2048) &&
	sample_rate != 22050)
	return 0;

	/* only return half certainty since this check is a bit sketchy */
	return AVPROBE_SCORE_EXTENSION;
	}

	static int vmd_read_header(AVFormatContext *s)
	{
	VmdDemuxContext *vmd = s->priv_data;
	AVIOContext *pb = s->pb;
	AVStream st = NULL, vst = NULL;
	unsigned int toc_offset;
	unsigned char *raw_frame_table;
	int raw_frame_table_size;
	int64_t current_offset;
	int i, j, ret;
	int width, height;
	unsigned int total_frames;
	int64_t current_audio_pts = 0;
	unsigned char chunk[BYTES_PER_FRAME_RECORD];
	int num, den;
	int sound_buffers;

	/* fetch the main header, including the 2 header length bytes */
	avio_seek(pb, 0, SEEK_SET);
	if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
	return AVERROR(EIO);

	width = AV_RL16(&vmd->vmd_header[12]);
	height = AV_RL16(&vmd->vmd_header[14]);
	if (width && height) {
	if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') {
	vmd->is_indeo3 = 1;
	} else {
	vmd->is_indeo3 = 0;
	}
	/* start up the decoders */
	vst = avformat_new_stream(s, NULL);
	if (!vst)
	return AVERROR(ENOMEM);
	avpriv_set_pts_info(vst, 33, 1, 10);
	vmd->video_stream_index = vst->index;
	vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
	vst->codecpar->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
	vst->codecpar->codec_tag = 0; /* no fourcc */
	vst->codecpar->width = width;
	vst->codecpar->height = height;
	if(vmd->is_indeo3 && vst->codecpar->width > 320){
	vst->codecpar->width >>= 1;
	vst->codecpar->height >>= 1;
	}
	if ((ret = ff_alloc_extradata(vst->codecpar, VMD_HEADER_SIZE)) < 0)
	return ret;
	memcpy(vst->codecpar->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
	}

	/* if sample rate is 0, assume no audio */
	vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
	if (vmd->sample_rate) {
	st = avformat_new_stream(s, NULL);
	if (!st)
	return AVERROR(ENOMEM);
	vmd->audio_stream_index = st->index;
	st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
	st->codecpar->codec_id = AV_CODEC_ID_VMDAUDIO;
	st->codecpar->codec_tag = 0; /* no fourcc */
	st->codecpar->sample_rate = vmd->sample_rate;
	st->codecpar->block_align = AV_RL16(&vmd->vmd_header[806]);
	if (st->codecpar->block_align & 0x8000) {
	st->codecpar->bits_per_coded_sample = 16;
	st->codecpar->block_align = -(st->codecpar->block_align - 0x10000);
	} else {
	st->codecpar->bits_per_coded_sample = 8;
	}
	if (vmd->vmd_header[811] & 0x80) {
	st->codecpar->channels = 2;
	st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
	} else if (vmd->vmd_header[811] & 0x2) {
	/* Shivers 2 stereo audio */
	/* Frame length is for 1 channel */
	st->codecpar->channels = 2;
	st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
	st->codecpar->block_align = st->codecpar->block_align << 1;
	} else {
	st->codecpar->channels = 1;
	st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
	}
	st->codecpar->bit_rate = st->codecpar->sample_rate *
	st->codecpar->bits_per_coded_sample * st->codecpar->channels;

	/* calculate pts */
	num = st->codecpar->block_align;
	den = st->codecpar->sample_rate * st->codecpar->channels;
	av_reduce(&num, &den, num, den, (1UL<<31)-1);
	if (vst)
	avpriv_set_pts_info(vst, 33, num, den);
	avpriv_set_pts_info(st, 33, num, den);
	}

	toc_offset = AV_RL32(&vmd->vmd_header[812]);
	vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
	vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
	avio_seek(pb, toc_offset, SEEK_SET);

	raw_frame_table = NULL;
	vmd->frame_table = NULL;
	sound_buffers = AV_RL16(&vmd->vmd_header[808]);
	raw_frame_table_size = vmd->frame_count * 6;
	if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
	av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
	return -1;
	}
	raw_frame_table = av_malloc(raw_frame_table_size);
	vmd->frame_table = av_malloc_array(vmd->frame_count * vmd->frames_per_block + sound_buffers, sizeof(vmd_frame));
	if (!raw_frame_table \|\| !vmd->frame_table) {
	ret = AVERROR(ENOMEM);
	goto error;
	}
	if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
	raw_frame_table_size) {
	ret = AVERROR(EIO);
	goto error;
	}

	total_frames = 0;
	for (i = 0; i < vmd->frame_count; i++) {

	current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);

	/* handle each entry in index block */
	for (j = 0; j < vmd->frames_per_block; j++) {
	int type;
	uint32_t size;

	if ((ret = avio_read(pb, chunk, BYTES_PER_FRAME_RECORD)) != BYTES_PER_FRAME_RECORD) {
	av_log(s, AV_LOG_ERROR, "Failed to read frame record\n");
	if (ret >= 0)
	ret = AVERROR_INVALIDDATA;
	goto error;
	}
	type = chunk[0];
	size = AV_RL32(&chunk[2]);
	if (size > INT_MAX / 2) {
	av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
	ret = AVERROR_INVALIDDATA;
	goto error;
	}
	if(!size && type != 1)
	continue;
	switch(type) {
	case 1: /* Audio Chunk */
	if (!st) break;
	/* first audio chunk contains several audio buffers */
	vmd->frame_table[total_frames].frame_offset = current_offset;
	vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
	vmd->frame_table[total_frames].frame_size = size;
	memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
	vmd->frame_table[total_frames].pts = current_audio_pts;
	total_frames++;
	if(!current_audio_pts)
	current_audio_pts += sound_buffers - 1;
	else
	current_audio_pts++;
	break;
	case 2: /* Video Chunk */
	vmd->frame_table[total_frames].frame_offset = current_offset;
	vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
	vmd->frame_table[total_frames].frame_size = size;
	memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
	vmd->frame_table[total_frames].pts = i;
	total_frames++;
	break;
	}
	current_offset += size;
	}
	}

	av_free(raw_frame_table);

	vmd->current_frame = 0;
	vmd->frame_count = total_frames;

	return 0;

	error:
	av_freep(&raw_frame_table);
	av_freep(&vmd->frame_table);
	return ret;
	}

	static int vmd_read_packet(AVFormatContext *s,
	AVPacket *pkt)
	{
	VmdDemuxContext *vmd = s->priv_data;
	AVIOContext *pb = s->pb;
	int ret = 0;
	vmd_frame *frame;

	if (vmd->current_frame >= vmd->frame_count)
	return AVERROR_EOF;

	frame = &vmd->frame_table[vmd->current_frame];
	/* position the stream (will probably be there already) */
	avio_seek(pb, frame->frame_offset, SEEK_SET);

	if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
	return AVERROR(EIO);
	ret = av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD);
	if (ret < 0)
	return ret;
	pkt->pos= avio_tell(pb);
	memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
	if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
	ret = avio_read(pb, pkt->data, frame->frame_size);
	else
	ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
	frame->frame_size);

	if (ret != frame->frame_size) {
	ret = AVERROR(EIO);
	}
	pkt->stream_index = frame->stream_index;
	pkt->pts = frame->pts;
	av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
	(frame->frame_record[0] == 0x02) ? "video" : "audio",
	frame->frame_size + BYTES_PER_FRAME_RECORD,
	pkt->pts);

	vmd->current_frame++;

	return ret;
	}

	static int vmd_read_close(AVFormatContext *s)
	{
	VmdDemuxContext *vmd = s->priv_data;

	av_freep(&vmd->frame_table);

	return 0;
	}

	AVInputFormat ff_vmd_demuxer = {
	.name = "vmd",
	.long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"),
	.priv_data_size = sizeof(VmdDemuxContext),
	.read_probe = vmd_probe,
	.read_header = vmd_read_header,
	.read_packet = vmd_read_packet,
	.read_close = vmd_read_close,
	};