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/*
* Faad decoder
* Copyright (c) 2003 Zdenek Kabelac.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* @file faad.c
* AAC decoder.
*
* still a bit unfinished - but it plays something
*/
#include "avcodec.h"
#include "faad.h"
/*
* when CONFIG_FAADBIN is defined the libfaad will be opened at runtime
*/
//#undef CONFIG_FAADBIN
//#define CONFIG_FAADBIN
#ifdef CONFIG_FAADBIN
#include <dlfcn.h>
static const char* libfaadname = "libfaad.so.0";
#else
#define dlopen(a)
#define dlclose(a)
#endif
typedef struct {
void* handle; /* dlopen handle */
void* faac_handle; /* FAAD library handle */
int frame_size;
int sample_size;
int flags;
/* faad calls */
faacDecHandle FAADAPI (*faacDecOpen)(void);
faacDecConfigurationPtr FAADAPI (*faacDecGetCurrentConfiguration)(faacDecHandle hDecoder);
unsigned char FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
faacDecConfigurationPtr config);
long FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
unsigned char *buffer,
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 (*faacDecClose)(faacDecHandle hDecoder);
void* FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
faacDecFrameInfo *hInfo,
unsigned char *buffer);
unsigned char* FAADAPI (*faacDecGetErrorMessage)(unsigned char errcode);
} FAACContext;
static const unsigned long faac_srates[] =
{
96000, 88200, 64000, 48000, 44100, 32000,
24000, 22050, 16000, 12000, 11025, 8000
};
static int faac_init_mp4(AVCodecContext *avctx)
{
FAACContext *s = (FAACContext *) avctx->priv_data;
unsigned long samplerate;
unsigned char channels;
int r = 0;
if (avctx->extradata)
r = s->faacDecInit2(s->faac_handle, (uint8_t*) avctx->extradata,
avctx->extradata_size,
&samplerate, &channels);
// else r = s->faacDecInit(s->faac_handle ... );
if (r < 0)
fprintf(stderr, "faacDecInit2 failed r:%d sr:%ld ch:%d s:%d\n",
r, samplerate, channels, avctx->extradata_size);
return r;
}
static int faac_init_aac(AVCodecContext *avctx)
{
FAACContext *s = (FAACContext *) avctx->priv_data;
return 0;
}
static int faac_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
FAACContext *s = (FAACContext *) avctx->priv_data;
faacDecFrameInfo frame_info;
void* out = s->faacDecDecode(s->faac_handle, &frame_info, (unsigned char*)buf);
//printf("DECODE FRAME %d, %d, %d - %p\n", buf_size, frame_info.samples, frame_info.bytesconsumed, out);
if (frame_info.error > 0) {
fprintf(stderr, "faac: frame decodinf failed: %s\n",
s->faacDecGetErrorMessage(frame_info.error));
return 0;
}
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;
}
static int faac_decode_end(AVCodecContext *avctx)
{
FAACContext *s = (FAACContext *) avctx->priv_data;
if (s->faacDecClose)
s->faacDecClose(s->faac_handle);
dlclose(s->handle);
return 0;
}
static int faac_decode_init(AVCodecContext *avctx)
{
FAACContext *s = (FAACContext *) avctx->priv_data;
faacDecConfigurationPtr faac_cfg;
#ifdef CONFIG_FAADBIN
const char* err = 0;
s->handle = dlopen(libfaadname, RTLD_LAZY);
if (!s->handle)
{
fprintf(stderr, "FAAD library: %s could not be opened! \n%s\n",
libfaadname, dlerror());
return -1;
}
#define dfaac(a, b) \
do { static const char* n = "faacDec" #a; \
if ((s->faacDec ## a = b dlsym( s->handle, n )) == NULL) { err = n; break; } } while(0)
for(;;) {
#else /* !CONFIG_FAADBIN */
#define dfaac(a, b) s->faacDec ## a = faacDec ## a
#endif /* CONFIG_FAADBIN */
// resolve all needed function calls
dfaac(Open, (faacDecHandle FAADAPI (*)(void)));
dfaac(GetCurrentConfiguration, (faacDecConfigurationPtr
FAADAPI (*)(faacDecHandle)));
dfaac(SetConfiguration, (unsigned char FAADAPI (*)(faacDecHandle,
faacDecConfigurationPtr)));
dfaac(Init, (long FAADAPI (*)(faacDecHandle, unsigned char*,
unsigned long*, unsigned char*)));
dfaac(Init2, (char FAADAPI (*)(faacDecHandle, unsigned char*,
unsigned long, unsigned long*,
unsigned char*)));
dfaac(Close, (void FAADAPI (*)(faacDecHandle hDecoder)));
dfaac(Decode, (void* FAADAPI (*)(faacDecHandle, faacDecFrameInfo*,
unsigned char*)));
dfaac(GetErrorMessage, (unsigned char* FAADAPI (*)(unsigned char)));
#undef dfacc
#ifdef CONFIG_FAADBIN
break;
}
if (err) {
dlclose(s->handle);
fprintf(stderr, "FAAD library: cannot resolve %s in %s!\n",
err, libfaadname);
return -1;
}
#endif
s->faac_handle = s->faacDecOpen();
if (!s->faac_handle) {
fprintf(stderr, "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_sample) {
case 8: fprintf(stderr, "FAADlib unsupported bps %d\n", avctx->bits_per_sample); break;
default:
case 16:
faac_cfg->outputFormat = FAAD_FMT_16BIT;
s->sample_size = 2;
break;
case 24:
faac_cfg->outputFormat = FAAD_FMT_24BIT;
s->sample_size = 3;
break;
case 32:
faac_cfg->outputFormat = FAAD_FMT_32BIT;
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);
return 0;
}
#define AAC_CODEC(id, name) \
AVCodec name ## _decoder = { \
#name, \
CODEC_TYPE_AUDIO, \
id, \
sizeof(FAACContext), \
faac_decode_init, \
NULL, \
faac_decode_end, \
faac_decode_frame, \
}
// FIXME - raw AAC files - maybe just one entry will be enough
AAC_CODEC(CODEC_ID_AAC, aac);
// If it's mp4 file - usually embeded into Qt Mov
AAC_CODEC(CODEC_ID_MPEG4AAC, mpeg4aac);
#undef AAC_CODEC
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