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ffmpeg/libavcodec/libfaad.c

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/*
* Faad decoder
* Copyright (c) 2003 Zdenek Kabelac
* Copyright (c) 2004 Thomas Raivio
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file libavcodec/libfaad.c
* AAC decoder.
*
* still a bit unfinished - but it plays something
*/
#include "avcodec.h"
#include "faad.h"
#ifndef FAADAPI
#define FAADAPI
#endif
/*
* when CONFIG_LIBFAADBIN is true libfaad will be opened at runtime
*/
//#undef CONFIG_LIBFAADBIN
//#define CONFIG_LIBFAADBIN 0
//#define CONFIG_LIBFAADBIN 1
#if CONFIG_LIBFAADBIN
#include <dlfcn.h>
static const char* const libfaadname = "libfaad.so";
#else
#define dlopen(a)
#define dlclose(a)
#endif
typedef struct {
void* handle; /* dlopen handle */
void* faac_handle; /* FAAD library handle */
int sample_size;
int init;
/* faad calls */
faacDecHandle FAADAPI (*faacDecOpen)(void);
faacDecConfigurationPtr FAADAPI (*faacDecGetCurrentConfiguration)(faacDecHandle hDecoder);
#ifndef FAAD2_VERSION
int FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
faacDecConfigurationPtr config);
int FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
unsigned char *buffer,
unsigned long *samplerate,
unsigned long *channels);
int FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
unsigned long SizeOfDecoderSpecificInfo,
unsigned long *samplerate, unsigned long *channels);
int FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
unsigned char *buffer,
unsigned long *bytesconsumed,
short *sample_buffer,
unsigned long *samples);
#else
unsigned char FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
faacDecConfigurationPtr config);
long FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
unsigned char *buffer,
unsigned long buffer_size,
unsigned long *samplerate,
unsigned char *channels);
char FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
unsigned long SizeOfDecoderSpecificInfo,
unsigned long *samplerate, unsigned char *channels);
void *FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
faacDecFrameInfo *hInfo,
unsigned char *buffer,
unsigned long buffer_size);
char* FAADAPI (*faacDecGetErrorMessage)(unsigned char errcode);
#endif
void FAADAPI (*faacDecClose)(faacDecHandle hDecoder);
} FAACContext;
static const unsigned long faac_srates[] =
{
96000, 88200, 64000, 48000, 44100, 32000,
24000, 22050, 16000, 12000, 11025, 8000
};
static void channel_setup(AVCodecContext *avctx)
{
#ifdef FAAD2_VERSION
FAACContext *s = avctx->priv_data;
if (avctx->request_channels > 0 && avctx->request_channels == 2 &&
avctx->request_channels < avctx->channels) {
faacDecConfigurationPtr faac_cfg;
avctx->channels = 2;
faac_cfg = s->faacDecGetCurrentConfiguration(s->faac_handle);
faac_cfg->downMatrix = 1;
s->faacDecSetConfiguration(s->faac_handle, faac_cfg);
}
#endif
}
static av_cold int faac_init_mp4(AVCodecContext *avctx)
{
FAACContext *s = avctx->priv_data;
unsigned long samplerate;
#ifndef FAAD2_VERSION
unsigned long channels;
#else
unsigned char channels;
#endif
int r = 0;
if (avctx->extradata){
r = s->faacDecInit2(s->faac_handle, (uint8_t*) avctx->extradata,
avctx->extradata_size,
&samplerate, &channels);
if (r < 0){
av_log(avctx, AV_LOG_ERROR,
"faacDecInit2 failed r:%d sr:%ld ch:%ld s:%d\n",
r, samplerate, (long)channels, avctx->extradata_size);
} else {
avctx->sample_rate = samplerate;
avctx->channels = channels;
channel_setup(avctx);
s->init = 1;
}
}
return r;
}
static int faac_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
FAACContext *s = avctx->priv_data;
#ifndef FAAD2_VERSION
unsigned long bytesconsumed;
short *sample_buffer = NULL;
unsigned long samples;
int out;
#else
faacDecFrameInfo frame_info;
void *out;
#endif
if(buf_size == 0)
return 0;
#ifndef FAAD2_VERSION
out = s->faacDecDecode(s->faac_handle,
(unsigned char*)buf,
&bytesconsumed,
data,
&samples);
samples *= s->sample_size;
if (data_size)
*data_size = samples;
return (buf_size < (int)bytesconsumed)
? buf_size : (int)bytesconsumed;
#else
if(!s->init){
unsigned long srate;
unsigned char channels;
int r = s->faacDecInit(s->faac_handle, buf, buf_size, &srate, &channels);
if(r < 0){
av_log(avctx, AV_LOG_ERROR, "faac: codec init failed.\n");
return -1;
}
avctx->sample_rate = srate;
avctx->channels = channels;
channel_setup(avctx);
s->init = 1;
}
out = s->faacDecDecode(s->faac_handle, &frame_info, (unsigned char*)buf, (unsigned long)buf_size);
if (frame_info.error > 0) {
av_log(avctx, AV_LOG_ERROR, "faac: frame decoding failed: %s\n",
s->faacDecGetErrorMessage(frame_info.error));
return -1;
}
if (!avctx->frame_size)
avctx->frame_size = frame_info.samples/avctx->channels;
frame_info.samples *= s->sample_size;
memcpy(data, out, frame_info.samples); // CHECKME - can we cheat this one
if (data_size)
*data_size = frame_info.samples;
return (buf_size < (int)frame_info.bytesconsumed)
? buf_size : (int)frame_info.bytesconsumed;
#endif
}
static av_cold int faac_decode_end(AVCodecContext *avctx)
{
FAACContext *s = avctx->priv_data;
s->faacDecClose(s->faac_handle);
dlclose(s->handle);
return 0;
}
static av_cold int faac_decode_init(AVCodecContext *avctx)
{
FAACContext *s = avctx->priv_data;
faacDecConfigurationPtr faac_cfg;
#if CONFIG_LIBFAADBIN
const char* err = 0;
s->handle = dlopen(libfaadname, RTLD_LAZY);
if (!s->handle)
{
av_log(avctx, AV_LOG_ERROR, "FAAD library: %s could not be opened! \n%s\n",
libfaadname, dlerror());
return -1;
}
#define dfaac(a) do { \
const char* n = AV_STRINGIFY(faacDec ## a); \
if (!err && !(s->faacDec ## a = dlsym(s->handle, n))) { \
err = n; \
} \
} while(0)
#else /* !CONFIG_LIBFAADBIN */
#define dfaac(a) s->faacDec ## a = faacDec ## a
#endif /* CONFIG_LIBFAADBIN */
// resolve all needed function calls
dfaac(Open);
dfaac(Close);
dfaac(GetCurrentConfiguration);
dfaac(SetConfiguration);
dfaac(Init);
dfaac(Init2);
dfaac(Decode);
#ifdef FAAD2_VERSION
dfaac(GetErrorMessage);
#endif
#undef dfaac
#if CONFIG_LIBFAADBIN
if (err) {
dlclose(s->handle);
av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot resolve %s in %s!\n",
err, libfaadname);
return -1;
}
#endif
s->faac_handle = s->faacDecOpen();
if (!s->faac_handle) {
av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot create handler!\n");
faac_decode_end(avctx);
return -1;
}
faac_cfg = s->faacDecGetCurrentConfiguration(s->faac_handle);
if (faac_cfg) {
switch (avctx->bits_per_coded_sample) {
case 8: av_log(avctx, AV_LOG_ERROR, "FAADlib unsupported bps %d\n", avctx->bits_per_coded_sample); break;
default:
case 16:
#ifdef FAAD2_VERSION
faac_cfg->outputFormat = FAAD_FMT_16BIT;
#endif
s->sample_size = 2;
break;
case 24:
#ifdef FAAD2_VERSION
faac_cfg->outputFormat = FAAD_FMT_24BIT;
#endif
s->sample_size = 3;
break;
case 32:
#ifdef FAAD2_VERSION
faac_cfg->outputFormat = FAAD_FMT_32BIT;
#endif
s->sample_size = 4;
break;
}
faac_cfg->defSampleRate = (!avctx->sample_rate) ? 44100 : avctx->sample_rate;
faac_cfg->defObjectType = LC;
}
s->faacDecSetConfiguration(s->faac_handle, faac_cfg);
faac_init_mp4(avctx);
if(!s->init && avctx->channels > 0)
channel_setup(avctx);
avctx->sample_fmt = SAMPLE_FMT_S16;
return 0;
}
AVCodec libfaad_decoder = {
"libfaad",
CODEC_TYPE_AUDIO,
CODEC_ID_AAC,
sizeof(FAACContext),
faac_decode_init,
NULL,
faac_decode_end,
faac_decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("libfaad AAC (Advanced Audio Codec)"),
};
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