[FFmpeg-devel] Add waveformat extensible support in wav muxer (SoC qualification task)

[Michael Niedermayer]

On Sat, Apr 04, 2009 at 05:14:06PM +0800, zhentan feng wrote:
> 2009/4/4 Michael Niedermayer <michaelni at gmx.at>
> 
> > [...]
> >
> > > Index: libavformat/riff.c
> > > ===================================================================
> > > --- libavformat/riff.c        (revision 18184)
> > > +++ libavformat/riff.c        (working copy)
> > > @@ -283,6 +283,7 @@
> > >  {
> > >      int bps, blkalign, bytespersec;
> > >      int hdrsize = 18;
> > > +    int pre_size = 0;
> > >
> > >      if(!enc->codec_tag || enc->codec_tag > 0xffff)
> > >          return -1;
> > > @@ -292,8 +293,16 @@
> > >      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) {
> > >          bps = 0;
> > > +        if (enc->codec_id == CODEC_ID_MP2) {
> > > +            pre_size = 22; /* wav_extra_size */
> > > +        } else if(enc->codec_id == CODEC_ID_MP3) {
> > > +            pre_size = 12; /* wav_extra_size */
> > > +        } else
> > > +            pre_size = 2; /* wav_extra_size */
> > >      } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id
> > == CODEC_ID_ADPCM_MS || enc->codec_id == CODEC_ID_ADPCM_G726 ||
> > enc->codec_id == CODEC_ID_ADPCM_YAMAHA) { //
> > >          bps = 4;
> > > +        if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV)
> > > +            pre_size = 2; /* wav_extra_size */
> > >      } else {
> > >          if (!(bps = av_get_bits_per_sample(enc->codec_id)))
> > >              bps = 16; // default to 16
> > > @@ -324,8 +333,15 @@
> > >      put_le32(pb, bytespersec); /* bytes per second */
> > >      put_le16(pb, blkalign); /* block align */
> > >      put_le16(pb, bps); /* bits per sample */
> > > +
> > > +    if (!pre_size && enc->extradata_size)
> > > +        pre_size = enc->extradata_size;
> > > +    if (pre_size)
> > > +        put_le16(pb, pre_size);
> > > +    else
> > > +        return hdrsize - 2;
> > > +
> > >      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 */
> > > @@ -333,7 +349,6 @@
> > >          put_le16(pb, 1); /* nFramesPerBlock */
> > >          put_le16(pb, 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 */
> > > @@ -344,15 +359,12 @@
> > >          put_le32(pb, 0);  /* dwPTSLow */
> > >          put_le32(pb, 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 */
> > >      } 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 */
> > >      } else if(enc->extradata_size){
> > > -        put_le16(pb, enc->extradata_size);
> > >          put_buffer(pb, enc->extradata, enc->extradata_size);
> > >          hdrsize += enc->extradata_size;
> > >          if(hdrsize&1){
> >
> > uint8_t temp[256];
> > uint8_t *riff_extradata= temp;
> > uint8_t *riff_extradata_start= temp;
> >
> > if(codec_id == abc){
> >    bytestream_put_le16()
> >    ...
> > }else if ...
> > ...
> > } else if(enc->extradata_size){
> >     riff_extradata_start= enc->extradata;
> >    riff_extradata= enc->extradata + enc->extradata_size;
> > }
> >
> > if(waveformatext){
> >    ...
> > }else{
> >    ...
> > }
> > put_buffer(pb, riff_extradata, riff_extradata - riff_extradata_start);
> >
> 
> here is the new patch.
> I'll submit the indent patch and extract some code lines later.

patch ok if it works

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In a rich man's house there is no place to spit but his face.
-- Diogenes of Sinope
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