diff options
Diffstat (limited to 'libavcodec/dpcm.c')
| -rw-r--r-- | libavcodec/dpcm.c | 45 |
1 files changed, 43 insertions, 2 deletions
diff --git a/libavcodec/dpcm.c b/libavcodec/dpcm.c index 2425f84eb9..2420647bc0 100644 --- a/libavcodec/dpcm.c +++ b/libavcodec/dpcm.c @@ -45,7 +45,8 @@ typedef struct DPCMContext { int16_t array[256]; - int sample[2]; ///< previous sample (for SOL_DPCM) + int sample[2]; ///< previous sample (for SOL_DPCM and WADY_DPCM) + int scale; ///< scale for WADY_DPCM const int8_t *sol_table; ///< delta table for SOL_DPCM } DPCMContext; @@ -126,6 +127,24 @@ static const int16_t sol_table_16[128] = { 0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000 }; +static const int16_t wady_table[128] = { + 0, 2, 4, 6, 8, 10, 12, 15, + 18, 21, 24, 28, 32, 36, 40, 44, + 49, 54, 59, 64, 70, 76, 82, 88, + 95, 102, 109, 116, 124, 132, 140, 148, + 160, 170, 180, 190, 200, 210, 220, 230, + 240, 255, 270, 285, 300, 320, 340, 360, + 380, 400, 425, 450, 475, 500, 525, 550, + 580, 610, 650, 700, 750, 800, 900, 1000, + -0, -2, -4, -6, -8, -10, -12, -15, + -18, -21, -24, -28, -32, -36, -40, -44, + -49, -54, -59, -64, -70, -76, -82, -88, + -95, -102,-109,-116,-124,-132,-140,-148, + -160,-170,-180,-190,-200,-210,-220,-230, + -240,-255,-270,-285,-300,-320,-340,-360, + -380,-400,-425,-450,-475,-500,-525,-550, + -580,-610,-650,-700,-750,-800,-900,-1000, +}; static av_cold int dpcm_decode_init(AVCodecContext *avctx) { @@ -139,7 +158,7 @@ static av_cold int dpcm_decode_init(AVCodecContext *avctx) s->sample[0] = s->sample[1] = 0; - switch(avctx->codec->id) { + switch (avctx->codec->id) { case AV_CODEC_ID_ROQ_DPCM: /* initialize square table */ @@ -193,6 +212,10 @@ static av_cold int dpcm_decode_init(AVCodecContext *avctx) } break; + case AV_CODEC_ID_WADY_DPCM: + s->scale = (avctx->extradata && avctx->extradata_size > 0) ? avctx->extradata[0] : 1; + break; + default: break; } @@ -239,6 +262,7 @@ static int dpcm_decode_frame(AVCodecContext *avctx, AVFrame *frame, else out = buf_size; break; + case AV_CODEC_ID_WADY_DPCM: case AV_CODEC_ID_DERF_DPCM: case AV_CODEC_ID_GREMLIN_DPCM: case AV_CODEC_ID_SDX2_DPCM: @@ -401,6 +425,22 @@ static int dpcm_decode_frame(AVCodecContext *avctx, AVFrame *frame, } } break; + + case AV_CODEC_ID_WADY_DPCM: { + int idx = 0; + + while (output_samples < samples_end) { + const uint8_t n = bytestream2_get_byteu(&gb); + + if (n & 0x80) + s->sample[idx] = sign_extend((n & 0x7f) << 9, 16); + else + s->sample[idx] += s->scale * wady_table[n & 0x7f]; + *output_samples++ = av_clip_int16(s->sample[idx]); + idx ^= stereo; + } + } + break; } *got_frame_ptr = 1; @@ -427,3 +467,4 @@ DPCM_DECODER(AV_CODEC_ID_ROQ_DPCM, roq_dpcm, "DPCM id RoQ"); DPCM_DECODER(AV_CODEC_ID_SDX2_DPCM, sdx2_dpcm, "DPCM Squareroot-Delta-Exact"); DPCM_DECODER(AV_CODEC_ID_SOL_DPCM, sol_dpcm, "DPCM Sol"); DPCM_DECODER(AV_CODEC_ID_XAN_DPCM, xan_dpcm, "DPCM Xan"); +DPCM_DECODER(AV_CODEC_ID_WADY_DPCM, wady_dpcm, "DPCM Marble WADY"); |