static int pcm_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { PCMDecode *s = avctx->priv_data; int n; short *samples; uint8_t *src; samples = data; src = buf; switch(avctx->codec->id) { case CODEC_ID_PCM_S16LE: n = buf_size >> 1; for(;n>0;n--) { *samples++ = src[0] | (src[1] << 8); src += 2; } break; case CODEC_ID_PCM_S16BE: n = buf_size >> 1; for(;n>0;n--) { *samples++ = (src[0] << 8) | src[1]; src += 2; } break; case CODEC_ID_PCM_U16LE: n = buf_size >> 1; for(;n>0;n--) { *samples++ = (src[0] | (src[1] << 8)) - 0x8000; src += 2; } break; case CODEC_ID_PCM_U16BE: n = buf_size >> 1; for(;n>0;n--) { *samples++ = ((src[0] << 8) | src[1]) - 0x8000; src += 2; } break; case CODEC_ID_PCM_S8: n = buf_size; for(;n>0;n--) { *samples++ = src[0] << 8; src++; } break; case CODEC_ID_PCM_U8: n = buf_size; for(;n>0;n--) { *samples++ = ((int)src[0] - 128) << 8; src++; } break; case CODEC_ID_PCM_ALAW: case CODEC_ID_PCM_MULAW: n = buf_size; for(;n>0;n--) { *samples++ = s->table[src[0]]; src++; } break; default: return -1; } *data_size = (uint8_t *)samples - (uint8_t *)data; return src - buf; }