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Add waveformat-extensible support in the wav muxer.

Browse Source 
Patch (GSoC qualfication task) by Zhentan Feng spyfeng gmail com, see
"[FFmpeg-devel] Add waveformat extensible support in wav muxer (SoC
qualification task)" thread on mailinglist.

Originally committed as revision 18372 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ronald S. Bultje 2009-04-08 03:04:57 +00:00
parent 7b356d3951
commit 6e9f56c127
1 changed files with 43 additions and 24 deletions
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67
libavformat/riff.c
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@ -22,6 +22,7 @@
#include "libavcodec/avcodec.h"
#include "avformat.h"
#include "riff.h"
#include "libavcodec/bytestream.h"
/* Note: when encoding, the first matching tag is used, so order is
important if multiple tags possible for a given codec. */
@ -284,11 +285,20 @@ int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
{
int bps, blkalign, bytespersec;
int hdrsize = 18;
int waveformatextensible;
uint8_t temp[256];
uint8_t *riff_extradata= temp;
uint8_t *riff_extradata_start= temp;
if(!enc->codec_tag || enc->codec_tag > 0xffff)
return -1;
waveformatextensible = enc->channels > 2 && enc->channel_layout;
if (waveformatextensible) {
put_le16(pb, 0xfffe);
} else {
put_le16(pb, enc->codec_tag);
}
put_le16(pb, enc->channels);
put_le32(pb, enc->sample_rate);
if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {
@ -326,43 +336,52 @@ int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
put_le16(pb, blkalign); /* block align */
put_le16(pb, bps); /* bits per sample */
if (enc->codec_id == CODEC_ID_MP3) {
put_le16(pb, 12); /* wav_extra_size */
hdrsize += 12;
put_le16(pb, 1); /* wID */
put_le32(pb, 2); /* fdwFlags */
put_le16(pb, 1152); /* nBlockSize */
put_le16(pb, 1); /* nFramesPerBlock */
put_le16(pb, 1393); /* nCodecDelay */
bytestream_put_le16(&riff_extradata, 1); /* wID */
bytestream_put_le32(&riff_extradata, 2); /* fdwFlags */
bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
bytestream_put_le16(&riff_extradata, 1); /* nFramesPerBlock */
bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
} else if (enc->codec_id == CODEC_ID_MP2) {
put_le16(pb, 22); /* wav_extra_size */
hdrsize += 22;
put_le16(pb, 2); /* fwHeadLayer */
put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
put_le16(pb, 0); /* fwHeadModeExt */
put_le16(pb, 1); /* wHeadEmphasis */
put_le16(pb, 16); /* fwHeadFlags */
put_le32(pb, 0); /* dwPTSLow */
put_le32(pb, 0); /* dwPTSHigh */
bytestream_put_le16(&riff_extradata, 2); /* fwHeadLayer */
bytestream_put_le32(&riff_extradata, enc->bit_rate); /* dwHeadBitrate */
bytestream_put_le16(&riff_extradata, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
bytestream_put_le16(&riff_extradata, 0); /* fwHeadModeExt */
bytestream_put_le16(&riff_extradata, 1); /* wHeadEmphasis */
bytestream_put_le16(&riff_extradata, 16); /* fwHeadFlags */
bytestream_put_le32(&riff_extradata, 0); /* dwPTSLow */
bytestream_put_le32(&riff_extradata, 0); /* dwPTSHigh */
} else if (enc->codec_id == CODEC_ID_GSM_MS) {
put_le16(pb, 2); /* wav_extra_size */
hdrsize += 2;
put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
bytestream_put_le16(&riff_extradata, enc->frame_size); /* wSamplesPerBlock */
} else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
put_le16(pb, 2); /* wav_extra_size */
hdrsize += 2;
put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
bytestream_put_le16(&riff_extradata, enc->frame_size); /* wSamplesPerBlock */
} else if(enc->extradata_size){
put_le16(pb, enc->extradata_size);
put_buffer(pb, enc->extradata, enc->extradata_size);
riff_extradata_start= enc->extradata;
riff_extradata= enc->extradata + enc->extradata_size;
hdrsize += enc->extradata_size;
} else if (!waveformatextensible){
hdrsize -= 2;
}
if(waveformatextensible) { /* write WAVEFORMATEXTENSIBLE extensions */
hdrsize += 22;
put_le16(pb, riff_extradata - riff_extradata_start + 22); /* 22 is WAVEFORMATEXTENSIBLE size */
put_le16(pb, enc->bits_per_coded_sample); /* ValidBitsPerSample || SamplesPerBlock || Reserved */
put_le32(pb, enc->channel_layout); /* dwChannelMask */
put_le32(pb, enc->codec_tag); /* GUID + next 3 */
put_le32(pb, 0x00100000);
put_le32(pb, 0xAA000080);
put_le32(pb, 0x719B3800);
} else if(riff_extradata - riff_extradata_start) {
put_le16(pb, riff_extradata - riff_extradata_start);
}
put_buffer(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
if(hdrsize&1){
hdrsize++;
put_byte(pb, 0);
}
} else {
hdrsize -= 2;
}
return hdrsize;
}