diff options
author | Paul B Mahol <onemda@gmail.com> | 2020-03-15 13:03:27 +0300 |
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committer | Paul B Mahol <onemda@gmail.com> | 2020-03-17 18:05:15 +0300 |
commit | c6bbdba9cd8f022e1f697f624818431499d30fe1 (patch) | |
tree | eb8b56510407790e7ba83942e408fca4677ec25d /libavcodec/dpcm.c | |
parent | 30a73361fa7ca18d9617ef5dbfaf8755da6c2dd9 (diff) |
avcodec: add derf dpcm decoder
Diffstat (limited to 'libavcodec/dpcm.c')
-rw-r--r-- | libavcodec/dpcm.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/libavcodec/dpcm.c b/libavcodec/dpcm.c index 5958081b66..069bf1dcd8 100644 --- a/libavcodec/dpcm.c +++ b/libavcodec/dpcm.c @@ -49,6 +49,21 @@ typedef struct DPCMContext { const int8_t *sol_table; ///< delta table for SOL_DPCM } DPCMContext; +static const int32_t derf_steps[96] = { + 0, 1, 2, 3, 4, 5, 6, 7, + 8, 9, 10, 11, 12, 13, 14, 16, + 17, 19, 21, 23, 25, 28, 31, 34, + 37, 41, 45, 50, 55, 60, 66, 73, + 80, 88, 97, 107, 118, 130, 143, 157, + 173, 190, 209, 230, 253, 279, 307, 337, + 371, 408, 449, 494, 544, 598, 658, 724, + 796, 876, 963, 1060, 1166, 1282, 1411, 1552, + 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327, + 3660, 4026, 4428, 4871, 5358, 5894, 6484, 7132, + 7845, 8630, 9493, 10442, 11487, 12635, 13899, 15289, + 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767, +}; + static const int16_t interplay_delta_table[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, @@ -225,6 +240,7 @@ static int dpcm_decode_frame(AVCodecContext *avctx, void *data, else out = buf_size; break; + case AV_CODEC_ID_DERF_DPCM: case AV_CODEC_ID_GREMLIN_DPCM: case AV_CODEC_ID_SDX2_DPCM: out = buf_size; @@ -372,6 +388,21 @@ static int dpcm_decode_frame(AVCodecContext *avctx, void *data, } } break; + + case AV_CODEC_ID_DERF_DPCM: { + int idx = 0; + + while (output_samples < samples_end) { + uint8_t n = bytestream2_get_byteu(&gb); + int index = FFMIN(n & 0x7f, 95); + + s->sample[idx] += (n & 0x80 ? -1: 1) * derf_steps[index]; + s->sample[idx] = av_clip_int16(s->sample[idx]); + *output_samples++ = s->sample[idx]; + idx ^= stereo; + } + } + break; } *got_frame_ptr = 1; @@ -391,6 +422,7 @@ AVCodec ff_ ## name_ ## _decoder = { \ .capabilities = AV_CODEC_CAP_DR1, \ } +DPCM_DECODER(AV_CODEC_ID_DERF_DPCM, derf_dpcm, "DPCM Xilam DERF"); DPCM_DECODER(AV_CODEC_ID_GREMLIN_DPCM, gremlin_dpcm, "DPCM Gremlin"); DPCM_DECODER(AV_CODEC_ID_INTERPLAY_DPCM, interplay_dpcm, "DPCM Interplay"); DPCM_DECODER(AV_CODEC_ID_ROQ_DPCM, roq_dpcm, "DPCM id RoQ"); |