[FFmpeg-devel] [PATCH v1 1/1] avformat/amr: Return PATCHWELCOME on stereo files

[Paul B Mahol]

Are stereo files available somewhere? Known way to encode?

On Fri, Sep 17, 2021 at 4:14 AM Sun Zhenliang <hisunzhenliang at outlook.com>
wrote:

> Ping.
>
> Anyone could review this patch？
>
> Thx.
> 在 2021年9月16日 +0800 11:24，sunzhenliang <hisunzhenliang at outlook.com>，写道：
> > Signed-off-by: sunzhenliang <hisunzhenliang at outlook.com>
> > ---
> > libavformat/amr.c | 22 ++++++++++++++++++----
> > 1 file changed, 18 insertions(+), 4 deletions(-)
> >
> > diff --git a/libavformat/amr.c b/libavformat/amr.c
> > index 836b276fd5..2762010ebe 100644
> > --- a/libavformat/amr.c
> > +++ b/libavformat/amr.c
> > @@ -36,8 +36,10 @@ typedef struct {
> > uint64_t block_count;
> > } AMRContext;
> >
> > -static const char AMR_header[] = "#!AMR\n";
> > -static const char AMRWB_header[] = "#!AMR-WB\n";
> > +static const char AMR_header[] = "#!AMR\n";
> > +static const char AMR_MC_header[] = "#!AMR_MC1.0\n";
> > +static const char AMRWB_header[] = "#!AMR-WB\n";
> > +static const char AMRWB_MC_header[] = "#!AMR-WB_MC1.0\n";
> >
> > static const uint8_t amrnb_packed_size[16] = {
> > 13, 14, 16, 18, 20, 21, 27, 32, 6, 1, 1, 1, 1, 1, 1, 1
> > @@ -82,7 +84,7 @@ static int amr_read_header(AVFormatContext *s)
> > {
> > AVIOContext *pb = s->pb;
> > AVStream *st;
> > - uint8_t header[9];
> > + uint8_t header[15];
> >
> > if (avio_read(pb, header, 6) != 6)
> > return AVERROR_INVALIDDATA;
> > @@ -94,7 +96,19 @@ static int amr_read_header(AVFormatContext *s)
> > if (avio_read(pb, header + 6, 3) != 3)
> > return AVERROR_INVALIDDATA;
> > if (memcmp(header, AMRWB_header, 9)) {
> > - return -1;
> > + if (avio_read(pb, header + 6 + 3, 3) != 3)
> > + return AVERROR_INVALIDDATA;
> > + if (memcmp(header, AMR_MC_header, 12)) {
> > + if (avio_read(pb, header + 6 + 3 + 3, 3) != 3)
> > + return AVERROR_INVALIDDATA;
> > + if (memcmp(header, AMRWB_MC_header, 15)) {
> > + return -1;
> > + }
> > + avpriv_report_missing_feature(s, "multi-channel AMRWB");
> > + return AVERROR_PATCHWELCOME;
> > + }
> > + avpriv_report_missing_feature(s, "multi-channel AMR");
> > + return AVERROR_PATCHWELCOME;
> > }
> >
> > st->codecpar->codec_tag = MKTAG('s', 'a', 'w', 'b');
> > --
> > 2.25.1
> >
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