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| author | Rostislav Pehlivanov <atomnuker@gmail.com> | 2018-06-30 08:31:31 +0100 |
|---|---|---|
| committer | Rostislav Pehlivanov <atomnuker@gmail.com> | 2018-07-03 20:15:01 +0100 |
| commit | 755e618399264d57a64a21115e2bf067b73492e7 (patch) | |
| tree | 2032e665490e50574a3b744c6330c7028c0a16b6 /libavcodec/utils.c | |
| parent | 3c4af577aa50a3d90bbb0e04cfa42a9b2bd1ce07 (diff) | |
| download | ffmpeg-755e618399264d57a64a21115e2bf067b73492e7.tar.gz | |
lavc: implement an ATRAC9 decoder
This commit implements a full ATRAC9 decoder, a simple low-delay codec
developed by Sony and used in most PSVita games, some PS3 games and some
PS4 games. Its similar to AAC in that it uses Huffman coded scalefactors
but instead of vector quantization it just Huffman codes the spectral
coefficients (in a way similar to how Opus splits band energy coding
into coarse and fine precision). It opts to write rather large Huffman
codes by packing several small coefficients into one Huffman coded
symbol, though I don't believe this increases efficiency at all.
Band extension implements SBC in a simple way, first it mirrors the
lower spectrum onto the higher frequencies and then it uses one of 5
filters to shape it. Noise substitution is implemented via 2 of them.
Unlike previous ATRAC codecs, there's no QMF, this is a standard MDCT
codec.
Based off of the reverse engineering work of Alex Barney.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Diffstat (limited to 'libavcodec/utils.c')
| -rw-r--r-- | libavcodec/utils.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/libavcodec/utils.c b/libavcodec/utils.c index 59d41ccbb6..02e557eb05 100644 --- a/libavcodec/utils.c +++ b/libavcodec/utils.c @@ -1536,6 +1536,7 @@ static int get_audio_frame_duration(enum AVCodecID id, int sr, int ch, int ba, case AV_CODEC_ID_GSM_MS: return 320; case AV_CODEC_ID_MP1: return 384; case AV_CODEC_ID_ATRAC1: return 512; + case AV_CODEC_ID_ATRAC9: case AV_CODEC_ID_ATRAC3: return 1024 * framecount; case AV_CODEC_ID_ATRAC3P: return 2048; case AV_CODEC_ID_MP2: |