mirror of
https://git.ffmpeg.org/ffmpeg.git
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573 lines
18 KiB
C
573 lines
18 KiB
C
/*
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* PCM codecs
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* Copyright (c) 2001 Fabrice Bellard.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file pcm.c
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* PCM codecs
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*/
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#include "avcodec.h"
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#include "bitstream.h" // for ff_reverse
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#include "bytestream.h"
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#define MAX_CHANNELS 64
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/* from g711.c by SUN microsystems (unrestricted use) */
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#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
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#define QUANT_MASK (0xf) /* Quantization field mask. */
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#define NSEGS (8) /* Number of A-law segments. */
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#define SEG_SHIFT (4) /* Left shift for segment number. */
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#define SEG_MASK (0x70) /* Segment field mask. */
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#define BIAS (0x84) /* Bias for linear code. */
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/*
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* alaw2linear() - Convert an A-law value to 16-bit linear PCM
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*
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*/
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static av_cold int alaw2linear(unsigned char a_val)
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{
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int t;
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int seg;
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a_val ^= 0x55;
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t = a_val & QUANT_MASK;
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seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
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if(seg) t= (t + t + 1 + 32) << (seg + 2);
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else t= (t + t + 1 ) << 3;
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return (a_val & SIGN_BIT) ? t : -t;
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}
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static av_cold int ulaw2linear(unsigned char u_val)
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{
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int t;
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/* Complement to obtain normal u-law value. */
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u_val = ~u_val;
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/*
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* Extract and bias the quantization bits. Then
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* shift up by the segment number and subtract out the bias.
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*/
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t = ((u_val & QUANT_MASK) << 3) + BIAS;
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t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;
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return (u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS);
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}
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/* 16384 entries per table */
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static uint8_t linear_to_alaw[16384];
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static uint8_t linear_to_ulaw[16384];
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static av_cold void build_xlaw_table(uint8_t *linear_to_xlaw,
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int (*xlaw2linear)(unsigned char),
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int mask)
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{
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int i, j, v, v1, v2;
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j = 0;
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for(i=0;i<128;i++) {
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if (i != 127) {
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v1 = xlaw2linear(i ^ mask);
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v2 = xlaw2linear((i + 1) ^ mask);
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v = (v1 + v2 + 4) >> 3;
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} else {
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v = 8192;
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}
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for(;j<v;j++) {
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linear_to_xlaw[8192 + j] = (i ^ mask);
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if (j > 0)
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linear_to_xlaw[8192 - j] = (i ^ (mask ^ 0x80));
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}
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}
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linear_to_xlaw[0] = linear_to_xlaw[1];
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}
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static av_cold int pcm_encode_init(AVCodecContext *avctx)
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{
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avctx->frame_size = 1;
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switch(avctx->codec->id) {
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case CODEC_ID_PCM_ALAW:
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build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5);
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break;
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case CODEC_ID_PCM_MULAW:
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build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff);
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break;
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default:
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break;
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}
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avctx->block_align = avctx->channels * av_get_bits_per_sample(avctx->codec->id)/8;
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avctx->coded_frame= avcodec_alloc_frame();
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avctx->coded_frame->key_frame= 1;
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return 0;
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}
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static av_cold int pcm_encode_close(AVCodecContext *avctx)
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{
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av_freep(&avctx->coded_frame);
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return 0;
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}
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/**
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* Write PCM samples macro
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* @param type Datatype of native machine format
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* @param endian bytestream_put_xxx() suffix
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* @param src Source pointer (variable name)
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* @param dst Destination pointer (variable name)
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* @param n Total number of samples (variable name)
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* @param shift Bitshift (bits)
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* @param offset Sample value offset
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*/
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#define ENCODE(type, endian, src, dst, n, shift, offset) \
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samples_##type = (type*)src; \
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for(;n>0;n--) { \
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register type v = (*samples_##type++ >> shift) + offset; \
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bytestream_put_##endian(&dst, v); \
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}
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static int pcm_encode_frame(AVCodecContext *avctx,
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unsigned char *frame, int buf_size, void *data)
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{
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int n, sample_size, v;
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short *samples;
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unsigned char *dst;
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uint8_t *srcu8;
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int16_t *samples_int16_t;
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int32_t *samples_int32_t;
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int64_t *samples_int64_t;
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uint16_t *samples_uint16_t;
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uint32_t *samples_uint32_t;
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sample_size = av_get_bits_per_sample(avctx->codec->id)/8;
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n = buf_size / sample_size;
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samples = data;
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dst = frame;
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if (avctx->sample_fmt!=avctx->codec->sample_fmts[0]) {
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av_log(avctx, AV_LOG_ERROR, "invalid sample_fmt\n");
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return -1;
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}
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switch(avctx->codec->id) {
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case CODEC_ID_PCM_U32LE:
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ENCODE(uint32_t, le32, samples, dst, n, 0, 0x80000000)
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break;
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case CODEC_ID_PCM_U32BE:
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ENCODE(uint32_t, be32, samples, dst, n, 0, 0x80000000)
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break;
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case CODEC_ID_PCM_S24LE:
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ENCODE(int32_t, le24, samples, dst, n, 8, 0)
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break;
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case CODEC_ID_PCM_S24BE:
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ENCODE(int32_t, be24, samples, dst, n, 8, 0)
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break;
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case CODEC_ID_PCM_U24LE:
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ENCODE(uint32_t, le24, samples, dst, n, 8, 0x800000)
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break;
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case CODEC_ID_PCM_U24BE:
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ENCODE(uint32_t, be24, samples, dst, n, 8, 0x800000)
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break;
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case CODEC_ID_PCM_S24DAUD:
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for(;n>0;n--) {
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uint32_t tmp = ff_reverse[(*samples >> 8) & 0xff] +
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(ff_reverse[*samples & 0xff] << 8);
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tmp <<= 4; // sync flags would go here
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bytestream_put_be24(&dst, tmp);
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samples++;
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}
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break;
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case CODEC_ID_PCM_U16LE:
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ENCODE(uint16_t, le16, samples, dst, n, 0, 0x8000)
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break;
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case CODEC_ID_PCM_U16BE:
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ENCODE(uint16_t, be16, samples, dst, n, 0, 0x8000)
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break;
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case CODEC_ID_PCM_S8:
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srcu8= data;
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for(;n>0;n--) {
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v = *srcu8++;
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*dst++ = v - 128;
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}
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break;
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#if WORDS_BIGENDIAN
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case CODEC_ID_PCM_F64LE:
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ENCODE(int64_t, le64, samples, dst, n, 0, 0)
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break;
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case CODEC_ID_PCM_S32LE:
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case CODEC_ID_PCM_F32LE:
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ENCODE(int32_t, le32, samples, dst, n, 0, 0)
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break;
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case CODEC_ID_PCM_S16LE:
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ENCODE(int16_t, le16, samples, dst, n, 0, 0)
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break;
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case CODEC_ID_PCM_F64BE:
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case CODEC_ID_PCM_F32BE:
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case CODEC_ID_PCM_S32BE:
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case CODEC_ID_PCM_S16BE:
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#else
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case CODEC_ID_PCM_F64BE:
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ENCODE(int64_t, be64, samples, dst, n, 0, 0)
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break;
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case CODEC_ID_PCM_F32BE:
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case CODEC_ID_PCM_S32BE:
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ENCODE(int32_t, be32, samples, dst, n, 0, 0)
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break;
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case CODEC_ID_PCM_S16BE:
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ENCODE(int16_t, be16, samples, dst, n, 0, 0)
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break;
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case CODEC_ID_PCM_F64LE:
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case CODEC_ID_PCM_F32LE:
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case CODEC_ID_PCM_S32LE:
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case CODEC_ID_PCM_S16LE:
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#endif /* WORDS_BIGENDIAN */
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case CODEC_ID_PCM_U8:
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memcpy(dst, samples, n*sample_size);
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dst += n*sample_size;
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break;
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case CODEC_ID_PCM_ZORK:
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for(;n>0;n--) {
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v= *samples++ >> 8;
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if(v<0) v = -v;
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else v+= 128;
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*dst++ = v;
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}
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break;
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case CODEC_ID_PCM_ALAW:
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for(;n>0;n--) {
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v = *samples++;
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*dst++ = linear_to_alaw[(v + 32768) >> 2];
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}
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break;
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case CODEC_ID_PCM_MULAW:
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for(;n>0;n--) {
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v = *samples++;
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*dst++ = linear_to_ulaw[(v + 32768) >> 2];
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}
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break;
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default:
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return -1;
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}
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//avctx->frame_size = (dst - frame) / (sample_size * avctx->channels);
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return dst - frame;
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}
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typedef struct PCMDecode {
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short table[256];
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} PCMDecode;
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static av_cold int pcm_decode_init(AVCodecContext * avctx)
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{
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PCMDecode *s = avctx->priv_data;
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int i;
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switch(avctx->codec->id) {
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case CODEC_ID_PCM_ALAW:
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for(i=0;i<256;i++)
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s->table[i] = alaw2linear(i);
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break;
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case CODEC_ID_PCM_MULAW:
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for(i=0;i<256;i++)
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s->table[i] = ulaw2linear(i);
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break;
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default:
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break;
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}
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avctx->sample_fmt = avctx->codec->sample_fmts[0];
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return 0;
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}
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/**
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* Read PCM samples macro
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* @param type Datatype of native machine format
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* @param endian bytestream_get_xxx() endian suffix
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* @param src Source pointer (variable name)
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* @param dst Destination pointer (variable name)
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* @param n Total number of samples (variable name)
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* @param shift Bitshift (bits)
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* @param offset Sample value offset
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*/
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#define DECODE(type, endian, src, dst, n, shift, offset) \
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dst_##type = (type*)dst; \
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for(;n>0;n--) { \
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register type v = bytestream_get_##endian(&src); \
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*dst_##type++ = (v - offset) << shift; \
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} \
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dst = (short*)dst_##type;
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static int pcm_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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const uint8_t *buf, int buf_size)
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{
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PCMDecode *s = avctx->priv_data;
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int sample_size, c, n;
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short *samples;
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const uint8_t *src, *src8, *src2[MAX_CHANNELS];
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uint8_t *dstu8;
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int16_t *dst_int16_t;
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int32_t *dst_int32_t;
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int64_t *dst_int64_t;
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uint16_t *dst_uint16_t;
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uint32_t *dst_uint32_t;
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samples = data;
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src = buf;
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if (avctx->sample_fmt!=avctx->codec->sample_fmts[0]) {
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av_log(avctx, AV_LOG_ERROR, "invalid sample_fmt\n");
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return -1;
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}
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if(avctx->channels <= 0 || avctx->channels > MAX_CHANNELS){
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av_log(avctx, AV_LOG_ERROR, "PCM channels out of bounds\n");
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return -1;
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}
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sample_size = av_get_bits_per_sample(avctx->codec_id)/8;
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/* av_get_bits_per_sample returns 0 for CODEC_ID_PCM_DVD */
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if (CODEC_ID_PCM_DVD == avctx->codec_id)
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/* 2 samples are interleaved per block in PCM_DVD */
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sample_size = avctx->bits_per_sample * 2 / 8;
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n = avctx->channels * sample_size;
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if(n && buf_size % n){
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av_log(avctx, AV_LOG_ERROR, "invalid PCM packet\n");
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return -1;
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}
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buf_size= FFMIN(buf_size, *data_size/2);
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*data_size=0;
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n = buf_size/sample_size;
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switch(avctx->codec->id) {
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case CODEC_ID_PCM_U32LE:
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DECODE(uint32_t, le32, src, samples, n, 0, 0x80000000)
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break;
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case CODEC_ID_PCM_U32BE:
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DECODE(uint32_t, be32, src, samples, n, 0, 0x80000000)
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break;
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case CODEC_ID_PCM_S24LE:
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DECODE(int32_t, le24, src, samples, n, 8, 0)
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break;
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case CODEC_ID_PCM_S24BE:
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DECODE(int32_t, be24, src, samples, n, 8, 0)
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break;
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case CODEC_ID_PCM_U24LE:
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DECODE(uint32_t, le24, src, samples, n, 8, 0x800000)
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break;
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case CODEC_ID_PCM_U24BE:
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DECODE(uint32_t, be24, src, samples, n, 8, 0x800000)
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break;
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case CODEC_ID_PCM_S24DAUD:
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for(;n>0;n--) {
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uint32_t v = bytestream_get_be24(&src);
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v >>= 4; // sync flags are here
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*samples++ = ff_reverse[(v >> 8) & 0xff] +
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(ff_reverse[v & 0xff] << 8);
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}
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break;
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case CODEC_ID_PCM_S16LE_PLANAR:
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n /= avctx->channels;
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for(c=0;c<avctx->channels;c++)
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src2[c] = &src[c*n*2];
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for(;n>0;n--)
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for(c=0;c<avctx->channels;c++)
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*samples++ = bytestream_get_le16(&src2[c]);
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src = src2[avctx->channels-1];
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break;
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case CODEC_ID_PCM_U16LE:
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DECODE(uint16_t, le16, src, samples, n, 0, 0x8000)
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break;
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case CODEC_ID_PCM_U16BE:
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DECODE(uint16_t, be16, src, samples, n, 0, 0x8000)
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break;
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case CODEC_ID_PCM_S8:
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dstu8= (uint8_t*)samples;
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for(;n>0;n--) {
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*dstu8++ = *src++ + 128;
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}
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samples= (short*)dstu8;
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break;
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#if WORDS_BIGENDIAN
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case CODEC_ID_PCM_F64LE:
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DECODE(int64_t, le64, src, samples, n, 0, 0)
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break;
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case CODEC_ID_PCM_S32LE:
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case CODEC_ID_PCM_F32LE:
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DECODE(int32_t, le32, src, samples, n, 0, 0)
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break;
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case CODEC_ID_PCM_S16LE:
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DECODE(int16_t, le16, src, samples, n, 0, 0)
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break;
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case CODEC_ID_PCM_F64BE:
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case CODEC_ID_PCM_F32BE:
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case CODEC_ID_PCM_S32BE:
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case CODEC_ID_PCM_S16BE:
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#else
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case CODEC_ID_PCM_F64BE:
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DECODE(int64_t, be64, src, samples, n, 0, 0)
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break;
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case CODEC_ID_PCM_F32BE:
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case CODEC_ID_PCM_S32BE:
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DECODE(int32_t, be32, src, samples, n, 0, 0)
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break;
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case CODEC_ID_PCM_S16BE:
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DECODE(int16_t, be16, src, samples, n, 0, 0)
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break;
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case CODEC_ID_PCM_F64LE:
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case CODEC_ID_PCM_F32LE:
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case CODEC_ID_PCM_S32LE:
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case CODEC_ID_PCM_S16LE:
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#endif /* WORDS_BIGENDIAN */
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case CODEC_ID_PCM_U8:
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memcpy(samples, src, n*sample_size);
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src += n*sample_size;
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samples = (short*)((uint8_t*)data + n*sample_size);
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break;
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case CODEC_ID_PCM_ZORK:
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for(;n>0;n--) {
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int x= *src++;
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if(x&128) x-= 128;
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else x = -x;
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*samples++ = x << 8;
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}
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break;
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case CODEC_ID_PCM_ALAW:
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case CODEC_ID_PCM_MULAW:
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for(;n>0;n--) {
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*samples++ = s->table[*src++];
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}
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break;
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case CODEC_ID_PCM_DVD:
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dst_int32_t = data;
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n /= avctx->channels;
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switch (avctx->bits_per_sample) {
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case 20:
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while (n--) {
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c = avctx->channels;
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src8 = src + 4*c;
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while (c--) {
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*dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8 &0xf0) << 8);
|
|
*dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8++ &0x0f) << 12);
|
|
}
|
|
src = src8;
|
|
}
|
|
break;
|
|
case 24:
|
|
while (n--) {
|
|
c = avctx->channels;
|
|
src8 = src + 4*c;
|
|
while (c--) {
|
|
*dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8++) << 8);
|
|
*dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8++) << 8);
|
|
}
|
|
src = src8;
|
|
}
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "PCM DVD unsupported sample depth\n");
|
|
return -1;
|
|
break;
|
|
}
|
|
samples = (short *) dst_int32_t;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
*data_size = (uint8_t *)samples - (uint8_t *)data;
|
|
return src - buf;
|
|
}
|
|
|
|
#ifdef CONFIG_ENCODERS
|
|
#define PCM_ENCODER(id,sample_fmt_,name,long_name_) \
|
|
AVCodec name ## _encoder = { \
|
|
#name, \
|
|
CODEC_TYPE_AUDIO, \
|
|
id, \
|
|
0, \
|
|
pcm_encode_init, \
|
|
pcm_encode_frame, \
|
|
pcm_encode_close, \
|
|
NULL, \
|
|
.sample_fmts = (enum SampleFormat[]){sample_fmt_,SAMPLE_FMT_NONE}, \
|
|
.long_name = NULL_IF_CONFIG_SMALL(long_name_), \
|
|
};
|
|
#else
|
|
#define PCM_ENCODER(id,sample_fmt_,name,long_name_)
|
|
#endif
|
|
|
|
#ifdef CONFIG_DECODERS
|
|
#define PCM_DECODER(id,sample_fmt_,name,long_name_) \
|
|
AVCodec name ## _decoder = { \
|
|
#name, \
|
|
CODEC_TYPE_AUDIO, \
|
|
id, \
|
|
sizeof(PCMDecode), \
|
|
pcm_decode_init, \
|
|
NULL, \
|
|
NULL, \
|
|
pcm_decode_frame, \
|
|
.sample_fmts = (enum SampleFormat[]){sample_fmt_,SAMPLE_FMT_NONE}, \
|
|
.long_name = NULL_IF_CONFIG_SMALL(long_name_), \
|
|
};
|
|
#else
|
|
#define PCM_DECODER(id,sample_fmt_,name,long_name_)
|
|
#endif
|
|
|
|
#define PCM_CODEC(id, sample_fmt_, name, long_name_) \
|
|
PCM_ENCODER(id,sample_fmt_,name,long_name_) PCM_DECODER(id,sample_fmt_,name,long_name_)
|
|
|
|
/* Note: Do not forget to add new entries to the Makefile as well. */
|
|
PCM_CODEC (CODEC_ID_PCM_ALAW, SAMPLE_FMT_S16, pcm_alaw, "A-law PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_DVD, SAMPLE_FMT_S32, pcm_dvd, "signed 20|24-bit big-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_F32BE, SAMPLE_FMT_FLT, pcm_f32be, "32-bit floating point big-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_F32LE, SAMPLE_FMT_FLT, pcm_f32le, "32-bit floating point little-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_F64BE, SAMPLE_FMT_DBL, pcm_f64be, "64-bit floating point big-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_F64LE, SAMPLE_FMT_DBL, pcm_f64le, "64-bit floating point little-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_MULAW, SAMPLE_FMT_S16, pcm_mulaw, "mu-law PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_S8, SAMPLE_FMT_U8, pcm_s8, "signed 8-bit PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_S16BE, SAMPLE_FMT_S16, pcm_s16be, "signed 16-bit big-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_S16LE, SAMPLE_FMT_S16, pcm_s16le, "signed 16-bit little-endian PCM");
|
|
PCM_DECODER(CODEC_ID_PCM_S16LE_PLANAR, SAMPLE_FMT_S16, pcm_s16le_planar, "16-bit little-endian planar PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_S24BE, SAMPLE_FMT_S32, pcm_s24be, "signed 24-bit big-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_S24DAUD, SAMPLE_FMT_S16, pcm_s24daud, "D-Cinema audio signed 24-bit PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_S24LE, SAMPLE_FMT_S32, pcm_s24le, "signed 24-bit little-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_S32BE, SAMPLE_FMT_S32, pcm_s32be, "signed 32-bit big-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_S32LE, SAMPLE_FMT_S32, pcm_s32le, "signed 32-bit little-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_U8, SAMPLE_FMT_U8, pcm_u8, "unsigned 8-bit PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_U16BE, SAMPLE_FMT_S16, pcm_u16be, "unsigned 16-bit big-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_U16LE, SAMPLE_FMT_S16, pcm_u16le, "unsigned 16-bit little-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_U24BE, SAMPLE_FMT_S32, pcm_u24be, "unsigned 24-bit big-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_U24LE, SAMPLE_FMT_S32, pcm_u24le, "unsigned 24-bit little-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_U32BE, SAMPLE_FMT_S32, pcm_u32be, "unsigned 32-bit big-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_U32LE, SAMPLE_FMT_S32, pcm_u32le, "unsigned 32-bit little-endian PCM");
|
|
PCM_CODEC (CODEC_ID_PCM_ZORK, SAMPLE_FMT_S16, pcm_zork, "Zork PCM");
|