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Set video width/height and create audio stream in read_packet instead of 

pre-parsing the file in read_header.
This avoids some code duplication and seeking, and also avoids an IO error
for small video-only files (as created during e.g. the FATE encoder test).

Originally committed as revision 17945 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-03-12 11:47:50 +00:00
parent fc34a08d77
commit 15969b55d1
1 changed files with 25 additions and 73 deletions
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98
libavformat/idroq.c
View File

@ -73,9 +73,6 @@ static int roq_read_header(AVFormatContext *s,
ByteIOContext *pb = s->pb;
AVStream *st;
unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
int i;
unsigned int chunk_size;
unsigned int chunk_type;
/* get the main header */
if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
@ -87,58 +84,8 @@ static int roq_read_header(AVFormatContext *s,
/* init private context parameters */
roq->width = roq->height = roq->audio_channels = roq->video_pts =
roq->audio_frame_count = 0;
roq->audio_stream_index = -1;
/* scan the first n chunks searching for A/V parameters */
for (i = 0; i < RoQ_CHUNKS_TO_SCAN; i++) {
if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
RoQ_CHUNK_PREAMBLE_SIZE)
return AVERROR(EIO);
chunk_type = AV_RL16(&preamble[0]);
chunk_size = AV_RL32(&preamble[2]);
switch (chunk_type) {
case RoQ_INFO:
/* fetch the width and height; reuse the preamble bytes */
if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
RoQ_CHUNK_PREAMBLE_SIZE)
return AVERROR(EIO);
roq->width = AV_RL16(&preamble[0]);
roq->height = AV_RL16(&preamble[2]);
break;
case RoQ_QUAD_CODEBOOK:
case RoQ_QUAD_VQ:
/* ignore during this scan */
url_fseek(pb, chunk_size, SEEK_CUR);
break;
case RoQ_SOUND_MONO:
roq->audio_channels = 1;
url_fseek(pb, chunk_size, SEEK_CUR);
break;
case RoQ_SOUND_STEREO:
roq->audio_channels = 2;
url_fseek(pb, chunk_size, SEEK_CUR);
break;
default:
av_log(s, AV_LOG_ERROR, " unknown RoQ chunk type (%04X)\n", AV_RL16(&preamble[0]));
return AVERROR_INVALIDDATA;
break;
}
/* if all necessary parameters have been gathered, exit early */
if ((roq->width && roq->height) && roq->audio_channels)
break;
}
/* seek back to the first chunk */
url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_SET);
/* initialize the decoders */
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
@ -148,25 +95,6 @@ static int roq_read_header(AVFormatContext *s,
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_ROQ;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->width = roq->width;
st->codec->height = roq->height;
if (roq->audio_channels) {
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
av_set_pts_info(st, 33, 1, 90000);
roq->audio_stream_index = st->index;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_ROQ_DPCM;
st->codec->codec_tag = 0; /* no tag */
st->codec->channels = roq->audio_channels;
st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
st->codec->bits_per_coded_sample = 16;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
st->codec->bits_per_coded_sample;
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
}
return 0;
}
@ -202,6 +130,14 @@ static int roq_read_packet(AVFormatContext *s,
switch (chunk_type) {
case RoQ_INFO:
if (!roq->width || !roq->height) {
AVStream *st = s->streams[roq->video_stream_index];
if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
return AVERROR(EIO);
st->codec->width = roq->width = AV_RL16(preamble);
st->codec->height = roq->height = AV_RL16(preamble + 2);
break;
}
/* don't care about this chunk anymore */
url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_CUR);
break;
@ -233,6 +169,22 @@ static int roq_read_packet(AVFormatContext *s,
case RoQ_SOUND_MONO:
case RoQ_SOUND_STEREO:
if (roq->audio_stream_index == -1) {
AVStream *st = av_new_stream(s, 1);
if (!st)
return AVERROR(ENOMEM);
av_set_pts_info(st, 33, 1, 90000);
roq->audio_stream_index = st->index;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_ROQ_DPCM;
st->codec->codec_tag = 0; /* no tag */
st->codec->channels = roq->audio_channels = chunk_type == RoQ_SOUND_STEREO ? 2 : 1;
st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
st->codec->bits_per_coded_sample = 16;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
st->codec->bits_per_coded_sample;
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
}
case RoQ_QUAD_VQ:
/* load up the packet */
if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))