[FFmpeg-devel] [PATCH] adpcm fixes and improvements

[Paul B Mahol]

On Wed, Aug 16, 2023 at 6:38 PM Michael Niedermayer <michael at niedermayer.cc>
wrote:

> On Tue, Aug 15, 2023 at 04:49:05PM +0200, Paul B Mahol wrote:
> > Attached
>
> [...]
> >  adpcm.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 3305dbe07ca935958fa213f5cadc339ad3cc3592
> 0003-avcodec-adpcm-use-already-existing-pointer-for-4xm-d.patch
> > From c6ad6dc7b8725d897e36399e5c7b8174caeb92e6 Mon Sep 17 00:00:00 2001
> > From: Paul B Mahol <onemda at gmail.com>
> > Date: Tue, 15 Aug 2023 14:18:47 +0200
> > Subject: [PATCH 3/4] avcodec/adpcm: use already existing pointer for 4xm
> >  decoder
> >
> > Signed-off-by: Paul B Mahol <onemda at gmail.com>
> > ---
> >  libavcodec/adpcm.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
> > index b0c3b91a3b..9993c9e531 100644
> > --- a/libavcodec/adpcm.c
> > +++ b/libavcodec/adpcm.c
> > @@ -1211,7 +1211,7 @@ static int adpcm_decode_frame(AVCodecContext
> *avctx, AVFrame *frame,
> >
> >          for (int i = 0; i < channels; i++) {
> >              ADPCMChannelStatus *cs = &c->status[i];
> > -            samples = (int16_t *)frame->data[i];
> > +            samples = samples_p[i];
> >              for (int n = nb_samples >> 1; n > 0; n--) {
> >                  int v = bytestream2_get_byteu(&gb);
> >                  *samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 4);
>
> should be ok if tested
>
>
> > --
> > 2.39.1
> >
>
> >  libavcodec/adpcm.c                     |  388
> +++++++++++++++++----------------
> >  tests/ref/fate/adpcm-creative-8-2.6bit |    2
> >  tests/ref/fate/adpcm-creative-8-2bit   |    2
> >  tests/ref/fate/adpcm-creative-8-4bit   |    2
> >  tests/ref/fate/adpcm-ms-mono           |   60 +----
> >  5 files changed, 227 insertions(+), 227 deletions(-)
> > 1760df1de66b4227e71ffe942dedcf7d8a33ad48
> 0004-avcodec-adpcm-consume-all-input-when-decoding.patch
> > From 19789bca53548d672bff30b88a8838edaa876bdb Mon Sep 17 00:00:00 2001
> > From: Paul B Mahol <onemda at gmail.com>
> > Date: Tue, 15 Aug 2023 15:25:22 +0200
> > Subject: [PATCH 4/4] avcodec/adpcm: consume all input when decoding
> >
> > Stops multiple decoding calls for single packet.
> > Also makes decoding faster.
>
> This increases latency, which can be problem if packets are
> sufficiently large
>

Then reduce size at demuxer level. there is option for it.


>
> thx
>
>
> [...]
>
> --
> 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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