virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity

added pcm codecs

Browse Source 
Originally committed as revision 140 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2001-09-23 17:16:51 +00:00
parent a56c66a7ef
commit a96b68b717
4 changed files with 446 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
libavcodec/Makefile
View File

@ -6,7 +6,7 @@ LDFLAGS= -g
OBJS= common.o utils.o mpegvideo.o h263.o jrevdct.o jfdctfst.o \
mpegaudio.o ac3enc.o mjpeg.o resample.o dsputil.o \
motion_est.o imgconvert.o imgresample.o msmpeg4.o \
mpeg12.o h263dec.o rv10.o mpegaudiodec.o
mpeg12.o h263dec.o rv10.o mpegaudiodec.o pcm.o
ASM_OBJS=
# currently using libac3 for ac3 decoding

43
libavcodec/avcodec.h
View File

@ -1,3 +1,6 @@
#ifndef AVCODEC_H
#define AVCODEC_H
#include "common.h"
enum CodecID {
@ -9,11 +12,20 @@ enum CodecID {
CODEC_ID_AC3,
CODEC_ID_MJPEG,
CODEC_ID_MPEG4,
CODEC_ID_PCM,
CODEC_ID_RAWVIDEO,
CODEC_ID_MSMPEG4,
CODEC_ID_H263P,
CODEC_ID_H263I,
/* various pcm "codecs" */
CODEC_ID_PCM_S16LE,
CODEC_ID_PCM_S16BE,
CODEC_ID_PCM_U16LE,
CODEC_ID_PCM_U16BE,
CODEC_ID_PCM_S8,
CODEC_ID_PCM_U8,
CODEC_ID_PCM_MULAW,
CODEC_ID_PCM_ALAW,
};
enum CodecType {
@ -30,6 +42,11 @@ enum PixelFormat {
PIX_FMT_YUV444P,
};
/* currently unused, may be used if 24/32 bits samples ever supported */
enum SampleFormat {
SAMPLE_FMT_S16 = 0, /* signed 16 bits */
};
/* in bytes */
#define AVCODEC_MAX_AUDIO_FRAME_SIZE 18432
@ -74,6 +91,7 @@ typedef struct AVCodecContext {
/* audio only */
int sample_rate; /* samples per sec */
int channels;
int sample_fmt; /* sample format, currenly unused */
/* the following data should not be initialized */
int frame_size; /* in samples, initialized when calling 'init' */
@ -130,13 +148,28 @@ extern AVCodec mpeg_decoder;
extern AVCodec h263i_decoder;
extern AVCodec rv10_decoder;
extern AVCodec mjpeg_decoder;
extern AVCodec mp3_decoder;
/* dummy raw codecs */
extern AVCodec pcm_codec;
/* pcm codecs */
#define PCM_CODEC(id, name) \
extern AVCodec name ## _decoder; \
extern AVCodec name ## _encoder;
PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be);
PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8);
PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);
#undef PCM_CODEC
/* dummy raw video codec */
extern AVCodec rawvideo_codec;
/* the following codecs use external GPL libs */
extern AVCodec mp3_decoder;
extern AVCodec ac3_decoder;
/* resample.c */
@ -203,3 +236,5 @@ int avcodec_encode_video(AVCodecContext *avctx, UINT8 *buf, int buf_size,
int avcodec_close(AVCodecContext *avctx);
void avcodec_register_all(void);
#endif /* AVCODEC_H */

367
libavcodec/pcm.c Normal file
View File

@ -0,0 +1,367 @@
/*
* PCM codecs
* Copyright (c) 2001 Gerard Lantau.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "avcodec.h"
/* from g711.c by SUN microsystems (unrestricted use) */
#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
#define QUANT_MASK (0xf) /* Quantization field mask. */
#define NSEGS (8) /* Number of A-law segments. */
#define SEG_SHIFT (4) /* Left shift for segment number. */
#define SEG_MASK (0x70) /* Segment field mask. */
#define BIAS (0x84) /* Bias for linear code. */
/*
* alaw2linear() - Convert an A-law value to 16-bit linear PCM
*
*/
static int alaw2linear(unsigned char a_val)
{
int t;
int seg;
a_val ^= 0x55;
t = (a_val & QUANT_MASK) << 4;
seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
switch (seg) {
case 0:
t += 8;
break;
case 1:
t += 0x108;
break;
default:
t += 0x108;
t <<= seg - 1;
}
return ((a_val & SIGN_BIT) ? t : -t);
}
static int ulaw2linear(unsigned char u_val)
{
int t;
/* Complement to obtain normal u-law value. */
u_val = ~u_val;
/*
* Extract and bias the quantization bits. Then
* shift up by the segment number and subtract out the bias.
*/
t = ((u_val & QUANT_MASK) << 3) + BIAS;
t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;
return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS));
}
/* 16384 entries per table */
static UINT8 *linear_to_alaw = NULL;
static int linear_to_alaw_ref = 0;
static UINT8 *linear_to_ulaw = NULL;
static int linear_to_ulaw_ref = 0;
static void build_xlaw_table(UINT8 *linear_to_xlaw,
int (*xlaw2linear)(unsigned char),
int mask)
{
int i, j, v, v1, v2;
j = 0;
for(i=0;i<128;i++) {
if (i != 127) {
v1 = xlaw2linear(i ^ mask);
v2 = xlaw2linear((i + 1) ^ mask);
v = (v1 + v2 + 4) >> 3;
} else {
v = 8192;
}
for(;j<v;j++) {
linear_to_xlaw[8192 + j] = (i ^ mask);
if (j > 0)
linear_to_xlaw[8192 - j] = (i ^ (mask ^ 0x80));
}
}
linear_to_xlaw[0] = linear_to_xlaw[1];
}
static int encode_init(AVCodecContext *avctx)
{
avctx->frame_size = 1;
switch(avctx->codec->id) {
case CODEC_ID_PCM_ALAW:
if (linear_to_alaw_ref == 0) {
linear_to_alaw = malloc(16384);
if (!linear_to_alaw)
return -1;
build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5);
}
linear_to_alaw_ref++;
break;
case CODEC_ID_PCM_MULAW:
if (linear_to_ulaw_ref == 0) {
linear_to_ulaw = malloc(16384);
if (!linear_to_ulaw)
return -1;
build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff);
}
linear_to_ulaw_ref++;
break;
default:
break;
}
return 0;
}
static int encode_close(AVCodecContext *avctx)
{
switch(avctx->codec->id) {
case CODEC_ID_PCM_ALAW:
if (--linear_to_alaw_ref == 0)
free(linear_to_alaw);
break;
case CODEC_ID_PCM_MULAW:
if (--linear_to_ulaw_ref == 0)
free(linear_to_ulaw);
break;
default:
/* nothing to free */
break;
}
return 0;
}
static int encode_frame(AVCodecContext *avctx,
unsigned char *frame, int buf_size, void *data)
{
int n, sample_size, v;
short *samples;
unsigned char *dst;
switch(avctx->codec->id) {
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S16BE:
case CODEC_ID_PCM_U16LE:
case CODEC_ID_PCM_U16BE:
sample_size = 2;
break;
default:
sample_size = 1;
break;
}
n = buf_size / sample_size;
samples = data;
dst = frame;
switch(avctx->codec->id) {
case CODEC_ID_PCM_S16LE:
for(;n>0;n--) {
v = *samples++;
dst[0] = v & 0xff;
dst[1] = v >> 8;
dst += 2;
}
break;
case CODEC_ID_PCM_S16BE:
for(;n>0;n--) {
v = *samples++;
dst[0] = v >> 8;
dst[1] = v;
dst += 2;
}
break;
case CODEC_ID_PCM_U16LE:
for(;n>0;n--) {
v = *samples++;
v += 0x8000;
dst[0] = v & 0xff;
dst[1] = v >> 8;
dst += 2;
}
break;
case CODEC_ID_PCM_U16BE:
for(;n>0;n--) {
v = *samples++;
v += 0x8000;
dst[0] = v >> 8;
dst[1] = v;
dst += 2;
}
break;
case CODEC_ID_PCM_S8:
for(;n>0;n--) {
v = *samples++;
dst[0] = (v + 128) >> 8;
dst++;
}
break;
case CODEC_ID_PCM_U8:
for(;n>0;n--) {
v = *samples++;
dst[0] = ((v + 128) >> 8) + 128;
dst++;
}
break;
case CODEC_ID_PCM_ALAW:
for(;n>0;n--) {
v = *samples++;
dst[0] = linear_to_alaw[(v + 32768) >> 2];
dst++;
}
break;
case CODEC_ID_PCM_MULAW:
for(;n>0;n--) {
v = *samples++;
dst[0] = linear_to_ulaw[(v + 32768) >> 2];
dst++;
}
break;
default:
return -1;
}
return dst - frame;
}
typedef struct PCMDecode {
short table[256];
} PCMDecode;
static int decode_init(AVCodecContext * avctx)
{
PCMDecode *s = avctx->priv_data;
int i;
switch(avctx->codec->id) {
case CODEC_ID_PCM_ALAW:
for(i=0;i<256;i++)
s->table[i] = alaw2linear(i);
break;
case CODEC_ID_PCM_MULAW:
for(i=0;i<256;i++)
s->table[i] = ulaw2linear(i);
break;
default:
break;
}
return 0;
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
UINT8 *buf, int buf_size)
{
PCMDecode *s = avctx->priv_data;
int n;
short *samples;
UINT8 *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:
*data_size = 0;
return -1;
}
*data_size = (UINT8 *)samples - (UINT8 *)data;
return src - buf;
}
#define PCM_CODEC(id, name) \
AVCodec name ## _encoder = { \
#name, \
CODEC_TYPE_AUDIO, \
id, \
0, \
encode_init, \
encode_frame, \
encode_close, \
NULL, \
}; \
AVCodec name ## _decoder = { \
#name, \
CODEC_TYPE_AUDIO, \
id, \
sizeof(PCMDecode), \
decode_init, \
NULL, \
NULL, \
decode_frame, \
};
PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be);
PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8);
PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);

56
libavcodec/utils.c
View File

@ -205,6 +205,7 @@ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
const char *codec_name;
AVCodec *p;
char buf1[32];
int bitrate;
if (encode)
p = avcodec_find_encoder(enc->codec_id);
@ -245,6 +246,7 @@ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
enc->width, enc->height,
(float)enc->frame_rate / FRAME_RATE_BASE);
}
bitrate = enc->bit_rate;
break;
case CODEC_TYPE_AUDIO:
snprintf(buf, buf_size,
@ -256,13 +258,31 @@ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
enc->sample_rate,
enc->channels == 2 ? "stereo" : "mono");
}
/* for PCM codecs, compute bitrate directly */
switch(enc->codec_id) {
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S16BE:
case CODEC_ID_PCM_U16LE:
case CODEC_ID_PCM_U16BE:
bitrate = enc->sample_rate * 16;
break;
case CODEC_ID_PCM_S8:
case CODEC_ID_PCM_U8:
case CODEC_ID_PCM_ALAW:
case CODEC_ID_PCM_MULAW:
bitrate = enc->sample_rate * 8;
break;
default:
bitrate = enc->bit_rate;
break;
}
break;
default:
abort();
}
if (enc->bit_rate != 0) {
if (bitrate != 0) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %d kb/s", enc->bit_rate / 1000);
", %d kb/s", bitrate / 1000);
}
}
@ -370,7 +390,6 @@ void avcodec_register_all(void)
register_avcodec(&mpeg4_encoder);
register_avcodec(&msmpeg4_encoder);
#endif /* CONFIG_ENCODERS */
register_avcodec(&pcm_codec);
register_avcodec(&rawvideo_codec);
/* decoders */
@ -382,13 +401,28 @@ void avcodec_register_all(void)
register_avcodec(&h263i_decoder);
register_avcodec(&rv10_decoder);
register_avcodec(&mjpeg_decoder);
//#ifdef CONFIG_MPGLIB
register_avcodec(&mp3_decoder);
//#endif
#ifdef CONFIG_AC3
register_avcodec(&ac3_decoder);
#endif
#endif /* CONFIG_DECODERS */
/* pcm codecs */
#define PCM_CODEC(id, name) \
register_avcodec(& name ## _encoder); \
register_avcodec(& name ## _decoder); \
PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be);
PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8);
PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);
#undef PCM_CODEC
}
static int encode_init(AVCodecContext *s)
@ -409,18 +443,6 @@ static int encode_frame(AVCodecContext *avctx,
return -1;
}
/* dummy pcm codec */
AVCodec pcm_codec = {
"pcm",
CODEC_TYPE_AUDIO,
CODEC_ID_PCM,
0,
encode_init,
encode_frame,
NULL,
decode_frame,
};
AVCodec rawvideo_codec = {
"rawvideo",
CODEC_TYPE_VIDEO,