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vqa: clean up audio header parsing

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Fix setting of bit_rate and bits_per_coded_sample.
Ask for sample for unsupported VQA versions.
This commit is contained in:
Justin Ruggles 2012-01-23 13:28:20 -05:00
parent 5b4c562897
commit 7e813d5933
1 changed files with 30 additions and 17 deletions
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47
libavformat/westwood_vqa.c
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@ -86,7 +86,7 @@ static int wsvqa_read_header(AVFormatContext *s,
unsigned char scratch[VQA_PREAMBLE_SIZE];
unsigned int chunk_tag;
unsigned int chunk_size;
int fps;
int fps, version, flags, sample_rate, channels;
/* initialize the video decoder stream */
st = avformat_new_stream(s, NULL);
@ -120,30 +120,43 @@ static int wsvqa_read_header(AVFormatContext *s,
avpriv_set_pts_info(st, 64, 1, fps);
/* initialize the audio decoder stream for VQA v1 or nonzero samplerate */
if (AV_RL16(&header[24]) || (AV_RL16(&header[0]) == 1 && AV_RL16(&header[2]) == 1)) {
version = AV_RL16(&header[ 0]);
flags = AV_RL16(&header[ 2]);
sample_rate = AV_RL16(&header[24]);
channels = header[26];
if (sample_rate || (version == 1 && flags == 1)) {
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->start_time = 0;
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
if (AV_RL16(&header[0]) == 1)
st->codec->codec_id = CODEC_ID_WESTWOOD_SND1;
else
st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS;
st->codec->codec_tag = 0; /* no tag */
st->codec->sample_rate = AV_RL16(&header[24]);
if (!st->codec->sample_rate)
st->codec->sample_rate = 22050;
st->codec->channels = header[26];
if (!st->codec->channels)
st->codec->channels = 1;
st->codec->bits_per_coded_sample = 16;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
st->codec->bits_per_coded_sample / 4;
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
if (!sample_rate)
sample_rate = 22050;
st->codec->sample_rate = sample_rate;
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
if (!channels)
channels = 1;
st->codec->channels = channels;
switch (version) {
case 1:
st->codec->codec_id = CODEC_ID_WESTWOOD_SND1;
break;
case 2:
case 3:
st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS;
st->codec->bits_per_coded_sample = 4;
st->codec->bit_rate = channels * sample_rate * 4;
break;
default:
/* NOTE: version 0 is supposedly raw pcm_u8 or pcm_s16le, but we do
not have any samples to validate this */
av_log_ask_for_sample(s, "VQA version %d audio\n", version);
return AVERROR_PATCHWELCOME;
}
wsvqa->audio_stream_index = st->index;
wsvqa->audio_samplerate = st->codec->sample_rate;
wsvqa->audio_channels = st->codec->channels;