[FFmpeg-devel] [RFC 00/10] AV_SAMPLE_FMT_DSD

[Anshul]

Peter Ross <pross at xvid.org> wrote:
>RFC:
>
>Direct Stream Digital (DSD), a.k.a One bit audio (OBA), is an
>alternative to PCM.
>It can be found in Super Audio CDs and hi-res downloadable music.
>
>Changes:
>- add sample fmt
>- move DSD-to-PCM conversion from libavcodec/dsddec into libswresample
>- DSD-over-PCM encoder, enabling bit perfect playback to external
>hardware
>
>Peter Ross (10):
>  add AV_SAMPLE_FMT_DSD and AV_SAMPLE_FMT_DSDP
>  swresample/audioconvert: integrate DSD to PCM conversion
>  swresample/audioconvert: display error message if not conversion not
>    supported
>  avfiter/af_aresample: when converting DSD->PCM and no output sample
>    rate is specified, reduce output sample rate by
>    swr_dsd2pcm_sr_factor()
>  avcodec/dsd: rework codecs to use AV_SAMPLE_FMT_DSD
>  avformat/uncodedframecrcenc: process AV_SAMPLE_FMT_DSD and
>    AV_SAMPLE_FMT_DSD
>  DSD-over-PCM (DoP)
>  avformat/riff: enable DoP muxing
>  avformat/iff: report actual DSD sample rate
>  avformat/dsfdec: report actual DSD sample rate
>
> Changelog                        |   1 +
> doc/APIchanges                   |   6 ++
> doc/general.texi                 |   1 +
> libavcodec/Makefile              |  10 +-
> libavcodec/allcodecs.c           |   9 +-
> libavcodec/avcodec.h             |   1 +
> libavcodec/codec_desc.c          |  15 ++-
>libavcodec/dop.c                 | 172
>++++++++++++++++++++++++++++++++++
> libavcodec/dsd_tablegen.c        |  38 --------
> libavcodec/dsd_tablegen.h        |  95 -------------------
>libavcodec/dsddec.c              | 198
>+++++++++++++++++++--------------------
> libavcodec/utils.c               |   3 +
> libavfilter/af_aresample.c       |   6 ++
> libavformat/dsfdec.c             |   3 +-
> libavformat/iff.c                |   2 +-
> libavformat/riff.c               |   1 +
> libavformat/riffenc.c            |   3 +-
> libavformat/uncodedframecrcenc.c |   2 +
> libavutil/samplefmt.c            |  13 ++-
> libavutil/samplefmt.h            |   3 +
> libswresample/Makefile           |  18 ++++
> libswresample/audioconvert.c     |  65 ++++++++++++-
> libswresample/audioconvert.h     |  11 ++-
> libswresample/dsd_tablegen.h     |  95 +++++++++++++++++++
> libswresample/swresample.c       |  24 ++++-
> libswresample/swresample.h       |   7 ++
> 26 files changed, 543 insertions(+), 259 deletions(-)
> create mode 100644 libavcodec/dop.c
> delete mode 100644 libavcodec/dsd_tablegen.c
> delete mode 100644 libavcodec/dsd_tablegen.h
> create mode 100644 libswresample/dsd_tablegen.h

Is dop also related to default behaviour of audio transcoding ?

-Anshul


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