static int pcm_decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size) { PCMDecode *s = avctx->priv_data; int sample_size, c, n; short *samples; const uint8_t *src, *src2[MAX_CHANNELS]; uint8_t *dstu8; int16_t *dst_int16_t; int32_t *dst_int32_t; int64_t *dst_int64_t; uint16_t *dst_uint16_t; uint32_t *dst_uint32_t; samples = data; src = buf; if (avctx->sample_fmt!=avctx->codec->sample_fmts[0]) { av_log(avctx, AV_LOG_ERROR, "invalid sample_fmt\n"); return -1; } if(avctx->channels <= 0 || avctx->channels > MAX_CHANNELS){ av_log(avctx, AV_LOG_ERROR, "PCM channels out of bounds\n"); return -1; } sample_size = av_get_bits_per_sample(avctx->codec_id)/8; n = avctx->channels * sample_size; /* av_get_bits_per_sample returns 0 for CODEC_ID_PCM_DVD */ if (CODEC_ID_PCM_DVD == avctx->codec_id) /* 2 samples are interleaved per block in PCM_DVD */ n = 2 * avctx->channels * avctx->bits_per_sample/8; if(n && buf_size % n){ av_log(avctx, AV_LOG_ERROR, "invalid PCM packet\n"); return -1; } buf_size= FFMIN(buf_size, *data_size/2); *data_size=0; n = buf_size/sample_size; switch(avctx->codec->id) { case CODEC_ID_PCM_U32LE: DECODE(uint32_t, le32, src, samples, n, 0, 0x80000000) break; case CODEC_ID_PCM_U32BE: DECODE(uint32_t, be32, src, samples, n, 0, 0x80000000) break; case CODEC_ID_PCM_S24LE: DECODE(int32_t, le24, src, samples, n, 8, 0) break; case CODEC_ID_PCM_S24BE: DECODE(int32_t, be24, src, samples, n, 8, 0) break; case CODEC_ID_PCM_U24LE: DECODE(uint32_t, le24, src, samples, n, 8, 0x800000) break; case CODEC_ID_PCM_U24BE: DECODE(uint32_t, be24, src, samples, n, 8, 0x800000) break; case CODEC_ID_PCM_S24DAUD: for(;n>0;n--) { uint32_t v = bytestream_get_be24(&src); v >>= 4; // sync flags are here *samples++ = ff_reverse[(v >> 8) & 0xff] + (ff_reverse[v & 0xff] << 8); } break; case CODEC_ID_PCM_S16LE_PLANAR: n /= avctx->channels; for(c=0;c<avctx->channels;c++) src2[c] = &src[c*n*2]; for(;n>0;n--) for(c=0;c<avctx->channels;c++) *samples++ = bytestream_get_le16(&src2[c]); src = src2[avctx->channels-1]; break; case CODEC_ID_PCM_U16LE: DECODE(uint16_t, le16, src, samples, n, 0, 0x8000) break; case CODEC_ID_PCM_U16BE: DECODE(uint16_t, be16, src, samples, n, 0, 0x8000) break; case CODEC_ID_PCM_S8: dstu8= (uint8_t*)samples; for(;n>0;n--) { *dstu8++ = *src++ + 128; } samples= (short*)dstu8; break; #if WORDS_BIGENDIAN case CODEC_ID_PCM_F64LE: DECODE(int64_t, le64, src, samples, n, 0, 0) break; case CODEC_ID_PCM_S32LE: case CODEC_ID_PCM_F32LE: DECODE(int32_t, le32, src, samples, n, 0, 0) break; case CODEC_ID_PCM_S16LE: DECODE(int16_t, le16, src, samples, n, 0, 0) break; case CODEC_ID_PCM_F64BE: case CODEC_ID_PCM_F32BE: case CODEC_ID_PCM_S32BE: case CODEC_ID_PCM_S16BE: #else case CODEC_ID_PCM_F64BE: DECODE(int64_t, be64, src, samples, n, 0, 0) break; case CODEC_ID_PCM_F32BE: case CODEC_ID_PCM_S32BE: DECODE(int32_t, be32, src, samples, n, 0, 0) break; case CODEC_ID_PCM_S16BE: DECODE(int16_t, be16, src, samples, n, 0, 0) break; case CODEC_ID_PCM_F64LE: case CODEC_ID_PCM_F32LE: case CODEC_ID_PCM_S32LE: case CODEC_ID_PCM_S16LE: #endif /* WORDS_BIGENDIAN */ case CODEC_ID_PCM_U8: memcpy(samples, src, n*sample_size); src += n*sample_size; samples = (short*)((uint8_t*)data + n*sample_size); break; case CODEC_ID_PCM_ZORK: for(;n>0;n--) { int x= *src++; if(x&128) x-= 128; else x = -x; *samples++ = x << 8; } break; case CODEC_ID_PCM_ALAW: case CODEC_ID_PCM_MULAW: for(;n>0;n--) { *samples++ = s->table[*src++]; } break; case CODEC_ID_PCM_DVD: if(avctx->bits_per_sample != 20 && avctx->bits_per_sample != 24) { av_log(avctx, AV_LOG_ERROR, "PCM DVD unsupported sample depth\n"); return -1; } else { int jump = avctx->channels * (avctx->bits_per_sample-16) / 4; n = buf_size / (avctx->channels * 2 * avctx->bits_per_sample / 8); while (n--) { for (c=0; c < 2*avctx->channels; c++) *samples++ = bytestream_get_be16(&src); src += jump; } } break; default: return -1; } *data_size = (uint8_t *)samples - (uint8_t *)data; return src - buf; }