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Code Issues Releases Activity

properly demux silent files; implemented precise framerate calculation

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Originally committed as revision 2330 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Mike Melanson 2003-10-02 04:16:59 +00:00
parent 68a43d044a
commit dda6142361
1 changed files with 36 additions and 21 deletions
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57
libavformat/ipmovie.c
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@ -96,7 +96,7 @@ typedef struct IPMVEContext {
unsigned char *buf;
int buf_size;
int fps;
float fps;
int frame_pts_inc;
unsigned int video_width;
@ -199,6 +199,9 @@ static int load_ipmovie_packet(IPMVEContext *s, ByteIOContext *pb,
pkt->stream_index = s->video_stream_index;
pkt->pts = s->video_pts;
debug_ipmovie("sending video frame with pts %lld\n",
pkt->pts);
s->video_pts += s->frame_pts_inc;
chunk_type = CHUNK_VIDEO;
@ -330,10 +333,9 @@ static int process_ipmovie_chunk(IPMVEContext *s, ByteIOContext *pb,
chunk_type = CHUNK_BAD;
break;
}
s->fps = 1000000 / (LE_32(&scratch[0]) * LE_16(&scratch[4]));
s->fps++; /* above calculation usually yields 14.9; we need 15 */
s->fps = 1000000.0 / (LE_32(&scratch[0]) * LE_16(&scratch[4]));
s->frame_pts_inc = 90000 / s->fps;
debug_ipmovie("%d frames/second (timer div = %d, subdiv = %d)\n",
debug_ipmovie(" %.2f frames/second (timer div = %d, subdiv = %d)\n",
s->fps, LE_32(&scratch[0]), LE_16(&scratch[4]));
break;
@ -527,6 +529,8 @@ static int ipmovie_read_header(AVFormatContext *s,
ByteIOContext *pb = &s->pb;
AVPacket pkt;
AVStream *st;
unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
int chunk_type;
/* initialize private context members */
ipmovie->video_pts = ipmovie->audio_frame_count = 0;
@ -540,8 +544,17 @@ static int ipmovie_read_header(AVFormatContext *s,
if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO)
return AVERROR_INVALIDDATA;
/* process the next chunk which should be CHUNK_INIT_AUDIO */
if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO)
/* peek ahead to the next chunk-- if it is an init audio chunk, process
* it; if it is the first video chunk, this is a silent file */
if (get_buffer(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
CHUNK_PREAMBLE_SIZE)
return -EIO;
chunk_type = LE_16(&chunk_preamble[2]);
url_fseek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR);
if (chunk_type == CHUNK_VIDEO)
ipmovie->audio_type = 0; /* no audio */
else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO)
return AVERROR_INVALIDDATA;
/* set the pts reference (1 pts = 1/90000) */
@ -563,21 +576,23 @@ static int ipmovie_read_header(AVFormatContext *s,
st->codec.extradata_size = sizeof(AVPaletteControl);
st->codec.extradata = &ipmovie->palette_control;
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
ipmovie->audio_stream_index = st->index;
st->codec.codec_type = CODEC_TYPE_AUDIO;
st->codec.codec_id = ipmovie->audio_type;
st->codec.codec_tag = 0; /* no tag */
st->codec.channels = ipmovie->audio_channels;
st->codec.sample_rate = ipmovie->audio_sample_rate;
st->codec.bits_per_sample = ipmovie->audio_bits;
st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
st->codec.bits_per_sample;
if (st->codec.codec_id == CODEC_ID_INTERPLAY_DPCM)
st->codec.bit_rate /= 2;
st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
if (ipmovie->audio_type) {
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
ipmovie->audio_stream_index = st->index;
st->codec.codec_type = CODEC_TYPE_AUDIO;
st->codec.codec_id = ipmovie->audio_type;
st->codec.codec_tag = 0; /* no tag */
st->codec.channels = ipmovie->audio_channels;
st->codec.sample_rate = ipmovie->audio_sample_rate;
st->codec.bits_per_sample = ipmovie->audio_bits;
st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
st->codec.bits_per_sample;
if (st->codec.codec_id == CODEC_ID_INTERPLAY_DPCM)
st->codec.bit_rate /= 2;
st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
}
return 0;
}