static int pcm_encode_frame(AVCodecContext *avctx, unsigned char *frame, int buf_size, void *data) { int n, sample_size, v; const short *samples; unsigned char *dst; const uint8_t *srcu8; const int16_t *samples_int16_t; const int32_t *samples_int32_t; const int64_t *samples_int64_t; const uint16_t *samples_uint16_t; const uint32_t *samples_uint32_t; sample_size = av_get_bits_per_sample(avctx->codec->id)/8; n = buf_size / sample_size; samples = data; dst = frame; if (avctx->sample_fmt!=avctx->codec->sample_fmts[0]) { av_log(avctx, AV_LOG_ERROR, "invalid sample_fmt\n"); return -1; } switch(avctx->codec->id) { case CODEC_ID_PCM_U32LE: ENCODE(uint32_t, le32, samples, dst, n, 0, 0x80000000) break; case CODEC_ID_PCM_U32BE: ENCODE(uint32_t, be32, samples, dst, n, 0, 0x80000000) break; case CODEC_ID_PCM_S24LE: ENCODE(int32_t, le24, samples, dst, n, 8, 0) break; case CODEC_ID_PCM_S24BE: ENCODE(int32_t, be24, samples, dst, n, 8, 0) break; case CODEC_ID_PCM_U24LE: ENCODE(uint32_t, le24, samples, dst, n, 8, 0x800000) break; case CODEC_ID_PCM_U24BE: ENCODE(uint32_t, be24, samples, dst, n, 8, 0x800000) break; case CODEC_ID_PCM_S24DAUD: for(;n>0;n--) { uint32_t tmp = av_reverse[(*samples >> 8) & 0xff] + (av_reverse[*samples & 0xff] << 8); tmp <<= 4; // sync flags would go here bytestream_put_be24(&dst, tmp); samples++; } break; case CODEC_ID_PCM_U16LE: ENCODE(uint16_t, le16, samples, dst, n, 0, 0x8000) break; case CODEC_ID_PCM_U16BE: ENCODE(uint16_t, be16, samples, dst, n, 0, 0x8000) break; case CODEC_ID_PCM_S8: srcu8= data; for(;n>0;n--) { v = *srcu8++; *dst++ = v - 128; } break; #if HAVE_BIGENDIAN case CODEC_ID_PCM_F64LE: ENCODE(int64_t, le64, samples, dst, n, 0, 0) break; case CODEC_ID_PCM_S32LE: case CODEC_ID_PCM_F32LE: ENCODE(int32_t, le32, samples, dst, n, 0, 0) break; case CODEC_ID_PCM_S16LE: ENCODE(int16_t, le16, samples, dst, 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: ENCODE(int64_t, be64, samples, dst, n, 0, 0) break; case CODEC_ID_PCM_F32BE: case CODEC_ID_PCM_S32BE: ENCODE(int32_t, be32, samples, dst, n, 0, 0) break; case CODEC_ID_PCM_S16BE: ENCODE(int16_t, be16, samples, dst, 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 /* HAVE_BIGENDIAN */ case CODEC_ID_PCM_U8: memcpy(dst, samples, n*sample_size); dst += n*sample_size; break; case CODEC_ID_PCM_ZORK: for(;n>0;n--) { v= *samples++ >> 8; if(v<0) v = -v; else v+= 128; *dst++ = v; } break; case CODEC_ID_PCM_ALAW: for(;n>0;n--) { v = *samples++; *dst++ = linear_to_alaw[(v + 32768) >> 2]; } break; case CODEC_ID_PCM_MULAW: for(;n>0;n--) { v = *samples++; *dst++ = linear_to_ulaw[(v + 32768) >> 2]; } break; default: return -1; } //avctx->frame_size = (dst - frame) / (sample_size * avctx->channels); return dst - frame; }