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aud: simplify header parsing

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also allows for removing some unused context fields
This commit is contained in:
Justin Ruggles 2012-01-24 11:40:23 -05:00
parent 0e6a8b5cf7
commit 10fef6bd6b
1 changed files with 29 additions and 24 deletions
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53
libavformat/westwood_aud.c
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@ -42,10 +42,8 @@
#define AUD_CHUNK_SIGNATURE 0x0000DEAF
typedef struct WsAudDemuxContext {
int audio_samplerate;
int audio_channels;
int audio_bits;
enum CodecID audio_type;
int audio_samplerate;
int audio_stream_index;
int64_t audio_frame_counter;
} WsAudDemuxContext;
@ -97,37 +95,44 @@ static int wsaud_read_header(AVFormatContext *s,
AVIOContext *pb = s->pb;
AVStream *st;
unsigned char header[AUD_HEADER_SIZE];
int sample_rate, channels, codec;
if (avio_read(pb, header, AUD_HEADER_SIZE) != AUD_HEADER_SIZE)
return AVERROR(EIO);
wsaud->audio_samplerate = AV_RL16(&header[0]);
if (header[11] == 99)
wsaud->audio_type = CODEC_ID_ADPCM_IMA_WS;
else if (header[11] == 1)
wsaud->audio_type = CODEC_ID_WESTWOOD_SND1;
else
return AVERROR_INVALIDDATA;
/* flag 0 indicates stereo */
wsaud->audio_channels = (header[10] & 0x1) + 1;
/* flag 1 indicates 16 bit audio */
wsaud->audio_bits = (((header[10] & 0x2) >> 1) + 1) * 8;
sample_rate = AV_RL16(&header[0]);
channels = (header[10] & 0x1) + 1;
codec = header[11];
/* initialize the audio decoder stream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 64, 1, wsaud->audio_samplerate);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = wsaud->audio_type;
st->codec->codec_tag = 0; /* no tag */
st->codec->channels = wsaud->audio_channels;
st->codec->sample_rate = wsaud->audio_samplerate;
if (st->codec->codec_id == CODEC_ID_ADPCM_IMA_WS) {
st->codec->bits_per_coded_sample = 4;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * 4;
}
switch (codec) {
case 1:
if (channels != 1) {
av_log_ask_for_sample(s, "Stereo WS-SND1 is not supported.\n");
return AVERROR_PATCHWELCOME;
}
st->codec->codec_id = CODEC_ID_WESTWOOD_SND1;
break;
case 99:
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:
av_log_ask_for_sample(s, "Unknown codec: %d\n", codec);
return AVERROR_PATCHWELCOME;
}
avpriv_set_pts_info(st, 64, 1, sample_rate);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->channels = channels;
st->codec->sample_rate = sample_rate;
wsaud->audio_channels = channels;
wsaud->audio_samplerate = sample_rate;
wsaud->audio_stream_index = st->index;
wsaud->audio_frame_counter = 0;