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FFmpeg/libavcodec/pcm.c
Christian Schmidt a42e3a6700 pcm_dvd: consolidate pieces from pcm.c and mpeg.c 
Remove the header decoding for PCM audio from mpeg.c and the
20/24bit parts from pcm.c and merge them into a new decoder in
pcm-dvd.c.

The decoder has added support for samples that span multiple
packets and modified 20/24bit group decoding. Both is needed to
decode samples that have been generated with DVD-Lab Pro 2. The
decoding of 16bit PCM and two channel 24bit is identical to
before. No other samples are known to verify the correctness of
the encoding this software does.
The complete list of tested formats is
48kHz/16bit/2-8 channels
48kHz/24bit/2-5 channels
96kHz/16bit/2-4 channels
96kHz/24bit/2 channels

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
2013-08-31 11:26:29 +02:00

508 lines
18 KiB
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/*
* PCM codecs
* Copyright (c) 2001 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* PCM codecs
*/
#include "libavutil/attributes.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "mathops.h"
#include "pcm_tablegen.h"
static av_cold int pcm_encode_init(AVCodecContext *avctx)
{
avctx->frame_size = 0;
switch (avctx->codec->id) {
case AV_CODEC_ID_PCM_ALAW:
pcm_alaw_tableinit();
break;
case AV_CODEC_ID_PCM_MULAW:
pcm_ulaw_tableinit();
break;
default:
break;
}
avctx->bits_per_coded_sample = av_get_bits_per_sample(avctx->codec->id);
avctx->block_align = avctx->channels * avctx->bits_per_coded_sample / 8;
avctx->bit_rate = avctx->block_align * avctx->sample_rate * 8;
avctx->coded_frame = avcodec_alloc_frame();
if (!avctx->coded_frame)
return AVERROR(ENOMEM);
return 0;
}
static av_cold int pcm_encode_close(AVCodecContext *avctx)
{
av_freep(&avctx->coded_frame);
return 0;
}
/**
* Write PCM samples macro
* @param type Datatype of native machine format
* @param endian bytestream_put_xxx() suffix
* @param src Source pointer (variable name)
* @param dst Destination pointer (variable name)
* @param n Total number of samples (variable name)
* @param shift Bitshift (bits)
* @param offset Sample value offset
*/
#define ENCODE(type, endian, src, dst, n, shift, offset) \
samples_ ## type = (const type *) src; \
for (; n > 0; n--) { \
register type v = (*samples_ ## type++ >> shift) + offset; \
bytestream_put_ ## endian(&dst, v); \
}
static int pcm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
int n, sample_size, v, ret;
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 = frame->nb_samples * avctx->channels;
samples = (const short *)frame->data[0];
if ((ret = ff_alloc_packet(avpkt, n * sample_size))) {
av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
return ret;
}
dst = avpkt->data;
switch (avctx->codec->id) {
case AV_CODEC_ID_PCM_U32LE:
ENCODE(uint32_t, le32, samples, dst, n, 0, 0x80000000)
break;
case AV_CODEC_ID_PCM_U32BE:
ENCODE(uint32_t, be32, samples, dst, n, 0, 0x80000000)
break;
case AV_CODEC_ID_PCM_S24LE:
ENCODE(int32_t, le24, samples, dst, n, 8, 0)
break;
case AV_CODEC_ID_PCM_S24BE:
ENCODE(int32_t, be24, samples, dst, n, 8, 0)
break;
case AV_CODEC_ID_PCM_U24LE:
ENCODE(uint32_t, le24, samples, dst, n, 8, 0x800000)
break;
case AV_CODEC_ID_PCM_U24BE:
ENCODE(uint32_t, be24, samples, dst, n, 8, 0x800000)
break;
case AV_CODEC_ID_PCM_S24DAUD:
for (; n > 0; n--) {
uint32_t tmp = ff_reverse[(*samples >> 8) & 0xff] +
(ff_reverse[*samples & 0xff] << 8);
tmp <<= 4; // sync flags would go here
bytestream_put_be24(&dst, tmp);
samples++;
}
break;
case AV_CODEC_ID_PCM_U16LE:
ENCODE(uint16_t, le16, samples, dst, n, 0, 0x8000)
break;
case AV_CODEC_ID_PCM_U16BE:
ENCODE(uint16_t, be16, samples, dst, n, 0, 0x8000)
break;
case AV_CODEC_ID_PCM_S8:
srcu8 = frame->data[0];
for (; n > 0; n--) {
v = *srcu8++;
*dst++ = v - 128;
}
break;
#if HAVE_BIGENDIAN
case AV_CODEC_ID_PCM_F64LE:
ENCODE(int64_t, le64, samples, dst, n, 0, 0)
break;
case AV_CODEC_ID_PCM_S32LE:
case AV_CODEC_ID_PCM_F32LE:
ENCODE(int32_t, le32, samples, dst, n, 0, 0)
break;
case AV_CODEC_ID_PCM_S16LE:
ENCODE(int16_t, le16, samples, dst, n, 0, 0)
break;
case AV_CODEC_ID_PCM_F64BE:
case AV_CODEC_ID_PCM_F32BE:
case AV_CODEC_ID_PCM_S32BE:
case AV_CODEC_ID_PCM_S16BE:
#else
case AV_CODEC_ID_PCM_F64BE:
ENCODE(int64_t, be64, samples, dst, n, 0, 0)
break;
case AV_CODEC_ID_PCM_F32BE:
case AV_CODEC_ID_PCM_S32BE:
ENCODE(int32_t, be32, samples, dst, n, 0, 0)
break;
case AV_CODEC_ID_PCM_S16BE:
ENCODE(int16_t, be16, samples, dst, n, 0, 0)
break;
case AV_CODEC_ID_PCM_F64LE:
case AV_CODEC_ID_PCM_F32LE:
case AV_CODEC_ID_PCM_S32LE:
case AV_CODEC_ID_PCM_S16LE:
#endif /* HAVE_BIGENDIAN */
case AV_CODEC_ID_PCM_U8:
memcpy(dst, samples, n * sample_size);
dst += n * sample_size;
break;
case AV_CODEC_ID_PCM_ALAW:
for (; n > 0; n--) {
v = *samples++;
*dst++ = linear_to_alaw[(v + 32768) >> 2];
}
break;
case AV_CODEC_ID_PCM_MULAW:
for (; n > 0; n--) {
v = *samples++;
*dst++ = linear_to_ulaw[(v + 32768) >> 2];
}
break;
default:
return -1;
}
*got_packet_ptr = 1;
return 0;
}
typedef struct PCMDecode {
short table[256];
} PCMDecode;
static av_cold int pcm_decode_init(AVCodecContext *avctx)
{
PCMDecode *s = avctx->priv_data;
int i;
if (avctx->channels <= 0) {
av_log(avctx, AV_LOG_ERROR, "PCM channels out of bounds\n");
return AVERROR(EINVAL);
}
switch (avctx->codec->id) {
case AV_CODEC_ID_PCM_ALAW:
for (i = 0; i < 256; i++)
s->table[i] = alaw2linear(i);
break;
case AV_CODEC_ID_PCM_MULAW:
for (i = 0; i < 256; i++)
s->table[i] = ulaw2linear(i);
break;
default:
break;
}
avctx->sample_fmt = avctx->codec->sample_fmts[0];
if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)
avctx->bits_per_raw_sample = av_get_bits_per_sample(avctx->codec->id);
return 0;
}
/**
* Read PCM samples macro
* @param size Data size of native machine format
* @param endian bytestream_get_xxx() endian suffix
* @param src Source pointer (variable name)
* @param dst Destination pointer (variable name)
* @param n Total number of samples (variable name)
* @param shift Bitshift (bits)
* @param offset Sample value offset
*/
#define DECODE(size, endian, src, dst, n, shift, offset) \
for (; n > 0; n--) { \
uint ## size ## _t v = bytestream_get_ ## endian(&src); \
AV_WN ## size ## A(dst, (v - offset) << shift); \
dst += size / 8; \
}
static int pcm_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *src = avpkt->data;
int buf_size = avpkt->size;
PCMDecode *s = avctx->priv_data;
AVFrame *frame = data;
int sample_size, c, n, ret, samples_per_block;
uint8_t *samples;
int32_t *dst_int32_t;
sample_size = av_get_bits_per_sample(avctx->codec_id) / 8;
/* av_get_bits_per_sample returns 0 for AV_CODEC_ID_PCM_DVD */
samples_per_block = 1;
if (avctx->codec_id == AV_CODEC_ID_PCM_LXF) {
/* we process 40-bit blocks per channel for LXF */
samples_per_block = 2;
sample_size = 5;
}
if (sample_size == 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid sample_size\n");
return AVERROR(EINVAL);
}
n = avctx->channels * sample_size;
if (n && buf_size % n) {
if (buf_size < n) {
av_log(avctx, AV_LOG_ERROR, "invalid PCM packet\n");
return -1;
} else
buf_size -= buf_size % n;
}
n = buf_size / sample_size;
/* get output buffer */
frame->nb_samples = n * samples_per_block / avctx->channels;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
samples = frame->data[0];
switch (avctx->codec->id) {
case AV_CODEC_ID_PCM_U32LE:
DECODE(32, le32, src, samples, n, 0, 0x80000000)
break;
case AV_CODEC_ID_PCM_U32BE:
DECODE(32, be32, src, samples, n, 0, 0x80000000)
break;
case AV_CODEC_ID_PCM_S24LE:
DECODE(32, le24, src, samples, n, 8, 0)
break;
case AV_CODEC_ID_PCM_S24BE:
DECODE(32, be24, src, samples, n, 8, 0)
break;
case AV_CODEC_ID_PCM_U24LE:
DECODE(32, le24, src, samples, n, 8, 0x800000)
break;
case AV_CODEC_ID_PCM_U24BE:
DECODE(32, be24, src, samples, n, 8, 0x800000)
break;
case AV_CODEC_ID_PCM_S24DAUD:
for (; n > 0; n--) {
uint32_t v = bytestream_get_be24(&src);
v >>= 4; // sync flags are here
AV_WN16A(samples, ff_reverse[(v >> 8) & 0xff] +
(ff_reverse[v & 0xff] << 8));
samples += 2;
}
break;
case AV_CODEC_ID_PCM_S16LE_PLANAR:
{
int av_unused n2;
n /= avctx->channels;
for (c = 0; c < avctx->channels; c++) {
samples = frame->extended_data[c];
#if HAVE_BIGENDIAN
n2 = n;
DECODE(16, le16, src, samples, n2, 0, 0)
#else
memcpy(samples, src, n * 2);
src += n * 2;
#endif
}
break;
}
case AV_CODEC_ID_PCM_U16LE:
DECODE(16, le16, src, samples, n, 0, 0x8000)
break;
case AV_CODEC_ID_PCM_U16BE:
DECODE(16, be16, src, samples, n, 0, 0x8000)
break;
case AV_CODEC_ID_PCM_S8:
for (; n > 0; n--)
*samples++ = *src++ + 128;
break;
#if HAVE_BIGENDIAN
case AV_CODEC_ID_PCM_F64LE:
DECODE(64, le64, src, samples, n, 0, 0)
break;
case AV_CODEC_ID_PCM_S32LE:
case AV_CODEC_ID_PCM_F32LE:
DECODE(32, le32, src, samples, n, 0, 0)
break;
case AV_CODEC_ID_PCM_S16LE:
DECODE(16, le16, src, samples, n, 0, 0)
break;
case AV_CODEC_ID_PCM_F64BE:
case AV_CODEC_ID_PCM_F32BE:
case AV_CODEC_ID_PCM_S32BE:
case AV_CODEC_ID_PCM_S16BE:
#else
case AV_CODEC_ID_PCM_F64BE:
DECODE(64, be64, src, samples, n, 0, 0)
break;
case AV_CODEC_ID_PCM_F32BE:
case AV_CODEC_ID_PCM_S32BE:
DECODE(32, be32, src, samples, n, 0, 0)
break;
case AV_CODEC_ID_PCM_S16BE:
DECODE(16, be16, src, samples, n, 0, 0)
break;
case AV_CODEC_ID_PCM_F64LE:
case AV_CODEC_ID_PCM_F32LE:
case AV_CODEC_ID_PCM_S32LE:
case AV_CODEC_ID_PCM_S16LE:
#endif /* HAVE_BIGENDIAN */
case AV_CODEC_ID_PCM_U8:
memcpy(samples, src, n * sample_size);
break;
case AV_CODEC_ID_PCM_ZORK:
for (; n > 0; n--) {
int v = *src++;
if (v < 128)
v = 128 - v;
*samples++ = v;
}
break;
case AV_CODEC_ID_PCM_ALAW:
case AV_CODEC_ID_PCM_MULAW:
for (; n > 0; n--) {
AV_WN16A(samples, s->table[*src++]);
samples += 2;
}
break;
case AV_CODEC_ID_PCM_LXF:
{
int i;
n /= avctx->channels;
for (c = 0; c < avctx->channels; c++) {
dst_int32_t = (int32_t *)frame->extended_data[c];
for (i = 0; i < n; i++) {
// extract low 20 bits and expand to 32 bits
*dst_int32_t++ = (src[2] << 28) |
(src[1] << 20) |
(src[0] << 12) |
((src[2] & 0x0F) << 8) |
src[1];
// extract high 20 bits and expand to 32 bits
*dst_int32_t++ = (src[4] << 24) |
(src[3] << 16) |
((src[2] & 0xF0) << 8) |
(src[4] << 4) |
(src[3] >> 4);
src += 5;
}
}
break;
}
default:
return -1;
}
*got_frame_ptr = 1;
return buf_size;
}
#define PCM_ENCODER_0(id_, sample_fmt_, name_, long_name_)
#define PCM_ENCODER_1(id_, sample_fmt_, name_, long_name_) \
AVCodec ff_ ## name_ ## _encoder = { \
.name = #name_, \
.type = AVMEDIA_TYPE_AUDIO, \
.id = AV_CODEC_ID_ ## id_, \
.init = pcm_encode_init, \
.encode2 = pcm_encode_frame, \
.close = pcm_encode_close, \
.capabilities = CODEC_CAP_VARIABLE_FRAME_SIZE, \
.sample_fmts = (const enum AVSampleFormat[]){ sample_fmt_, \
AV_SAMPLE_FMT_NONE }, \
.long_name = NULL_IF_CONFIG_SMALL(long_name_), \
}
#define PCM_ENCODER_2(cf, id, sample_fmt, name, long_name) \
PCM_ENCODER_ ## cf(id, sample_fmt, name, long_name)
#define PCM_ENCODER_3(cf, id, sample_fmt, name, long_name) \
PCM_ENCODER_2(cf, id, sample_fmt, name, long_name)
#define PCM_ENCODER(id, sample_fmt, name, long_name) \
PCM_ENCODER_3(CONFIG_ ## id ## _ENCODER, id, sample_fmt, name, long_name)
#define PCM_DECODER_0(id, sample_fmt, name, long_name)
#define PCM_DECODER_1(id_, sample_fmt_, name_, long_name_) \
AVCodec ff_ ## name_ ## _decoder = { \
.name = #name_, \
.type = AVMEDIA_TYPE_AUDIO, \
.id = AV_CODEC_ID_ ## id_, \
.priv_data_size = sizeof(PCMDecode), \
.init = pcm_decode_init, \
.decode = pcm_decode_frame, \
.capabilities = CODEC_CAP_DR1, \
.sample_fmts = (const enum AVSampleFormat[]){ sample_fmt_, \
AV_SAMPLE_FMT_NONE }, \
.long_name = NULL_IF_CONFIG_SMALL(long_name_), \
}
#define PCM_DECODER_2(cf, id, sample_fmt, name, long_name) \
PCM_DECODER_ ## cf(id, sample_fmt, name, long_name)
#define PCM_DECODER_3(cf, id, sample_fmt, name, long_name) \
PCM_DECODER_2(cf, id, sample_fmt, name, long_name)
#define PCM_DECODER(id, sample_fmt, name, long_name) \
PCM_DECODER_3(CONFIG_ ## id ## _DECODER, id, sample_fmt, name, long_name)
#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 (PCM_ALAW, AV_SAMPLE_FMT_S16, pcm_alaw, "PCM A-law");
PCM_CODEC (PCM_F32BE, AV_SAMPLE_FMT_FLT, pcm_f32be, "PCM 32-bit floating point big-endian");
PCM_CODEC (PCM_F32LE, AV_SAMPLE_FMT_FLT, pcm_f32le, "PCM 32-bit floating point little-endian");
PCM_CODEC (PCM_F64BE, AV_SAMPLE_FMT_DBL, pcm_f64be, "PCM 64-bit floating point big-endian");
PCM_CODEC (PCM_F64LE, AV_SAMPLE_FMT_DBL, pcm_f64le, "PCM 64-bit floating point little-endian");
PCM_DECODER(PCM_LXF, AV_SAMPLE_FMT_S32P, pcm_lxf, "PCM signed 20-bit little-endian planar");
PCM_CODEC (PCM_MULAW, AV_SAMPLE_FMT_S16, pcm_mulaw, "PCM mu-law");
PCM_CODEC (PCM_S8, AV_SAMPLE_FMT_U8, pcm_s8, "PCM signed 8-bit");
PCM_CODEC (PCM_S16BE, AV_SAMPLE_FMT_S16, pcm_s16be, "PCM signed 16-bit big-endian");
PCM_CODEC (PCM_S16LE, AV_SAMPLE_FMT_S16, pcm_s16le, "PCM signed 16-bit little-endian");
PCM_DECODER(PCM_S16LE_PLANAR, AV_SAMPLE_FMT_S16P, pcm_s16le_planar, "PCM 16-bit little-endian planar");
PCM_CODEC (PCM_S24BE, AV_SAMPLE_FMT_S32, pcm_s24be, "PCM signed 24-bit big-endian");
PCM_CODEC (PCM_S24DAUD, AV_SAMPLE_FMT_S16, pcm_s24daud, "PCM D-Cinema audio signed 24-bit");
PCM_CODEC (PCM_S24LE, AV_SAMPLE_FMT_S32, pcm_s24le, "PCM signed 24-bit little-endian");
PCM_CODEC (PCM_S32BE, AV_SAMPLE_FMT_S32, pcm_s32be, "PCM signed 32-bit big-endian");
PCM_CODEC (PCM_S32LE, AV_SAMPLE_FMT_S32, pcm_s32le, "PCM signed 32-bit little-endian");
PCM_CODEC (PCM_U8, AV_SAMPLE_FMT_U8, pcm_u8, "PCM unsigned 8-bit");
PCM_CODEC (PCM_U16BE, AV_SAMPLE_FMT_S16, pcm_u16be, "PCM unsigned 16-bit big-endian");
PCM_CODEC (PCM_U16LE, AV_SAMPLE_FMT_S16, pcm_u16le, "PCM unsigned 16-bit little-endian");
PCM_CODEC (PCM_U24BE, AV_SAMPLE_FMT_S32, pcm_u24be, "PCM unsigned 24-bit big-endian");
PCM_CODEC (PCM_U24LE, AV_SAMPLE_FMT_S32, pcm_u24le, "PCM unsigned 24-bit little-endian");
PCM_CODEC (PCM_U32BE, AV_SAMPLE_FMT_S32, pcm_u32be, "PCM unsigned 32-bit big-endian");
PCM_CODEC (PCM_U32LE, AV_SAMPLE_FMT_S32, pcm_u32le, "PCM unsigned 32-bit little-endian");
PCM_DECODER(PCM_ZORK, AV_SAMPLE_FMT_U8, pcm_zork, "PCM Zork");
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