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/*
* AMR Audio decoder stub
* Copyright (c) 2003 the ffmpeg project
*
* 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
* Adaptive Multi-Rate (AMR) Audio decoder stub.
*
* This code implements both an AMR-NarrowBand (AMR-NB) and an AMR-WideBand
* (AMR-WB) audio encoder/decoder through external reference code from
* http://www.3gpp.org/. The license of the code from 3gpp is unclear so you
* have to download the code separately. Two versions exists: One fixed-point
* and one floating-point. For some reason the float encoder is significantly
* faster at least on a P4 1.5GHz (0.9s instead of 9.9s on a 30s audio clip
* at MR102). Both float and fixed point are supported for AMR-NB, but only
* float for AMR-WB.
*
* \section AMR-NB
*
* \subsection Float
* The float version (default) can be downloaded from:
* http://www.3gpp.org/ftp/Specs/archive/26_series/26.104/26104-610.zip
*
* \subsection Fixed-point
* The fixed-point (TS26.073) can be downloaded from:
* http://www.3gpp.org/ftp/Specs/archive/26_series/26.073/26073-600.zip
*
* \subsection Specification
* The specification for AMR-NB can be found in TS 26.071
* (http://www.3gpp.org/ftp/Specs/html-info/26071.htm) and some other
* info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm.
*
* \section AMR-WB
*
* \subsection Float
* The reference code can be downloaded from:
* http://www.3gpp.org/ftp/Specs/archive/26_series/26.204/26204-600.zip
*
* \subsection Fixed-point
* If someone wants to use the fixed point version it can be downloaded from:
* http://www.3gpp.org/ftp/Specs/archive/26_series/26.173/26173-571.zip.
*
* \subsection Specification
* The specification for AMR-WB can be found in TS 26.171
* (http://www.3gpp.org/ftp/Specs/html-info/26171.htm) and some other
* info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm.
*
*/
#include "avcodec.h"
#ifdef CONFIG_LIBAMR_NB_FIXED
#define MMS_IO
#include "amr/sp_dec.h"
#include "amr/d_homing.h"
#include "amr/typedef.h"
#include "amr/sp_enc.h"
#include "amr/sid_sync.h"
#include "amr/e_homing.h"
#else
#include <amrnb/interf_dec.h>
#include <amrnb/interf_enc.h>
#endif
static const char *nb_bitrate_unsupported =
"bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k\n";
static const char *wb_bitrate_unsupported =
"bitrate not supported: use one of 6.6k, 8.85k, 12.65k, 14.25k, 15.85k, 18.25k, 19.85k, 23.05k, or 23.85k\n";
/* Common code for fixed and float version*/
typedef struct AMR_bitrates
{
int rate;
enum Mode mode;
} AMR_bitrates;
/* Match desired bitrate */
static int getBitrateMode(int bitrate)
{
/* make the correspondance between bitrate and mode */
AMR_bitrates rates[]={ {4750,MR475},
{5150,MR515},
{5900,MR59},
{6700,MR67},
{7400,MR74},
{7950,MR795},
{10200,MR102},
{12200,MR122},
};
int i;
for(i=0;i<8;i++)
{
if(rates[i].rate==bitrate)
{
return rates[i].mode;
}
}
/* no bitrate matching, return an error */
return -1;
}
static void amr_decode_fix_avctx(AVCodecContext * avctx)
{
const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
if(avctx->sample_rate == 0)
{
avctx->sample_rate = 8000 * is_amr_wb;
}
if(avctx->channels == 0)
{
avctx->channels = 1;
}
avctx->frame_size = 160 * is_amr_wb;
avctx->sample_fmt = SAMPLE_FMT_S16;
}
#ifdef CONFIG_LIBAMR_NB_FIXED
/* fixed point version*/
/* frame size in serial bitstream file (frame type + serial stream + flags) */
#define SERIAL_FRAMESIZE (1+MAX_SERIAL_SIZE+5)
typedef struct AMRContext {
int frameCount;
Speech_Decode_FrameState *speech_decoder_state;
enum RXFrameType rx_type;
enum Mode mode;
Word16 reset_flag;
Word16 reset_flag_old;
int enc_bitrate;
Speech_Encode_FrameState *enstate;
sid_syncState *sidstate;
enum TXFrameType tx_frametype;
} AMRContext;
static int amr_nb_decode_init(AVCodecContext * avctx)
{
AMRContext *s = avctx->priv_data;
s->frameCount=0;
s->speech_decoder_state=NULL;
s->rx_type = (enum RXFrameType)0;
s->mode= (enum Mode)0;
s->reset_flag=0;
s->reset_flag_old=1;
if(Speech_Decode_Frame_init(&s->speech_decoder_state, "Decoder"))
{
av_log(avctx, AV_LOG_ERROR, "Speech_Decode_Frame_init error\n");
return -1;
}
amr_decode_fix_avctx(avctx);
if(avctx->channels > 1)
{
av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
return -1;
}
return 0;
}
static int amr_nb_encode_init(AVCodecContext * avctx)
{
AMRContext *s = avctx->priv_data;
s->frameCount=0;
s->speech_decoder_state=NULL;
s->rx_type = (enum RXFrameType)0;
s->mode= (enum Mode)0;
s->reset_flag=0;
s->reset_flag_old=1;
if(avctx->sample_rate!=8000)
{
av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
return -1;
}
if(avctx->channels!=1)
{
av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
return -1;
}
avctx->frame_size=160;
avctx->coded_frame= avcodec_alloc_frame();
if(Speech_Encode_Frame_init(&s->enstate, 0, "encoder") || sid_sync_init (&s->sidstate))
{
av_log(avctx, AV_LOG_ERROR, "Speech_Encode_Frame_init error\n");
return -1;
}
if((s->enc_bitrate=getBitrateMode(avctx->bit_rate))<0)
{
av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
return -1;
}
return 0;
}
static int amr_nb_encode_close(AVCodecContext * avctx)
{
AMRContext *s = avctx->priv_data;
Speech_Encode_Frame_exit(&s->enstate);
sid_sync_exit (&s->sidstate);
av_freep(&avctx->coded_frame);
return 0;
}
static int amr_nb_decode_close(AVCodecContext * avctx)
{
AMRContext *s = avctx->priv_data;
Speech_Decode_Frame_exit(&s->speech_decoder_state);
return 0;
}
static int amr_nb_decode_frame(AVCodecContext * avctx,
void *data, int *data_size,
uint8_t * buf, int buf_size)
{
AMRContext *s = avctx->priv_data;
uint8_t*amrData=buf;
int offset=0;
UWord8 toc, q, ft;
Word16 serial[SERIAL_FRAMESIZE]; /* coded bits */
Word16 *synth;
UWord8 *packed_bits;
static Word16 packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
int i;
//printf("amr_decode_frame data_size=%i buf=0x%X buf_size=%d frameCount=%d!!\n",*data_size,buf,buf_size,s->frameCount);
synth=data;
toc=amrData[offset];
/* read rest of the frame based on ToC byte */
q = (toc >> 2) & 0x01;
ft = (toc >> 3) & 0x0F;
//printf("offset=%d, packet_size=%d amrData= 0x%X %X %X %X\n",offset,packed_size[ft],amrData[offset],amrData[offset+1],amrData[offset+2],amrData[offset+3]);
offset++;
packed_bits=amrData+offset;
offset+=packed_size[ft];
//Unsort and unpack bits
s->rx_type = UnpackBits(q, ft, packed_bits, &s->mode, &serial[1]);
//We have a new frame
s->frameCount++;
if (s->rx_type == RX_NO_DATA)
{
s->mode = s->speech_decoder_state->prev_mode;
}
else {
s->speech_decoder_state->prev_mode = s->mode;
}
/* if homed: check if this frame is another homing frame */
if (s->reset_flag_old == 1)
{
/* only check until end of first subframe */
s->reset_flag = decoder_homing_frame_test_first(&serial[1], s->mode);
}
/* produce encoder homing frame if homed & input=decoder homing frame */
if ((s->reset_flag != 0) && (s->reset_flag_old != 0))
{
for (i = 0; i < L_FRAME; i++)
{
synth[i] = EHF_MASK;
}
}
else
{
/* decode frame */
Speech_Decode_Frame(s->speech_decoder_state, s->mode, &serial[1], s->rx_type, synth);
}
//Each AMR-frame results in 160 16-bit samples
*data_size=160*2;
/* if not homed: check whether current frame is a homing frame */
if (s->reset_flag_old == 0)
{
/* check whole frame */
s->reset_flag = decoder_homing_frame_test(&serial[1], s->mode);
}
/* reset decoder if current frame is a homing frame */
if (s->reset_flag != 0)
{
Speech_Decode_Frame_reset(s->speech_decoder_state);
}
s->reset_flag_old = s->reset_flag;
return offset;
}
static int amr_nb_encode_frame(AVCodecContext *avctx,
unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
{
short serial_data[250] = {0};
AMRContext *s = avctx->priv_data;
int written;
s->reset_flag = encoder_homing_frame_test(data);
Speech_Encode_Frame(s->enstate, s->enc_bitrate, data, &serial_data[1], &s->mode);
/* add frame type and mode */
sid_sync (s->sidstate, s->mode, &s->tx_frametype);
written = PackBits(s->mode, s->enc_bitrate, s->tx_frametype, &serial_data[1], frame);
if (s->reset_flag != 0)
{
Speech_Encode_Frame_reset(s->enstate);
sid_sync_reset(s->sidstate);
}
return written;
}
#elif defined(CONFIG_LIBAMR_NB) /* Float point version*/
typedef struct AMRContext {
int frameCount;
void * decState;
int *enstate;
int enc_bitrate;
} AMRContext;
static int amr_nb_decode_init(AVCodecContext * avctx)
{
AMRContext *s = avctx->priv_data;
s->frameCount=0;
s->decState=Decoder_Interface_init();
if(!s->decState)
{
av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\r\n");
return -1;
}
amr_decode_fix_avctx(avctx);
if(avctx->channels > 1)
{
av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
return -1;
}
return 0;
}
static int amr_nb_encode_init(AVCodecContext * avctx)
{
AMRContext *s = avctx->priv_data;
s->frameCount=0;
if(avctx->sample_rate!=8000)
{
av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
return -1;
}
if(avctx->channels!=1)
{
av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
return -1;
}
avctx->frame_size=160;
avctx->coded_frame= avcodec_alloc_frame();
s->enstate=Encoder_Interface_init(0);
if(!s->enstate)
{
av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
return -1;
}
if((s->enc_bitrate=getBitrateMode(avctx->bit_rate))<0)
{
av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
return -1;
}
return 0;
}
static int amr_nb_decode_close(AVCodecContext * avctx)
{
AMRContext *s = avctx->priv_data;
Decoder_Interface_exit(s->decState);
return 0;
}
static int amr_nb_encode_close(AVCodecContext * avctx)
{
AMRContext *s = avctx->priv_data;
Encoder_Interface_exit(s->enstate);
av_freep(&avctx->coded_frame);
return 0;
}
static int amr_nb_decode_frame(AVCodecContext * avctx,
void *data, int *data_size,
uint8_t * buf, int buf_size)
{
AMRContext *s = avctx->priv_data;
uint8_t*amrData=buf;
static const uint8_t block_size[16]={ 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
enum Mode dec_mode;
int packet_size;
/* av_log(NULL,AV_LOG_DEBUG,"amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",buf,buf_size,s->frameCount); */
dec_mode = (buf[0] >> 3) & 0x000F;
packet_size = block_size[dec_mode]+1;
if(packet_size > buf_size) {
av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", buf_size, packet_size);
return -1;
}
s->frameCount++;
/* av_log(NULL,AV_LOG_DEBUG,"packet_size=%d amrData= 0x%X %X %X %X\n",packet_size,amrData[0],amrData[1],amrData[2],amrData[3]); */
/* call decoder */
Decoder_Interface_Decode(s->decState, amrData, data, 0);
*data_size=160*2;
return packet_size;
}
static int amr_nb_encode_frame(AVCodecContext *avctx,
unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
{
AMRContext *s = avctx->priv_data;
int written;
if((s->enc_bitrate=getBitrateMode(avctx->bit_rate))<0)
{
av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
return -1;
}
written = Encoder_Interface_Encode(s->enstate,
s->enc_bitrate,
data,
frame,
0);
/* av_log(NULL,AV_LOG_DEBUG,"amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",written, s->enc_bitrate, frame[0] ); */
return written;
}
#endif
#if defined(CONFIG_LIBAMR_NB) || defined(CONFIG_LIBAMR_NB_FIXED)
AVCodec libamr_nb_decoder =
{
"libamr_nb",
CODEC_TYPE_AUDIO,
CODEC_ID_AMR_NB,
sizeof(AMRContext),
amr_nb_decode_init,
NULL,
amr_nb_decode_close,
amr_nb_decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("libamr-nb Adaptive Multi-Rate (AMR) Narrow-Band"),
};
AVCodec libamr_nb_encoder =
{
"libamr_nb",
CODEC_TYPE_AUDIO,
CODEC_ID_AMR_NB,
sizeof(AMRContext),
amr_nb_encode_init,
amr_nb_encode_frame,
amr_nb_encode_close,
NULL,
.sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
.long_name = NULL_IF_CONFIG_SMALL("libamr-nb Adaptive Multi-Rate (AMR) Narrow-Band"),
};
#endif
/* -----------AMR wideband ------------*/
#ifdef CONFIG_LIBAMR_WB
#ifdef _TYPEDEF_H
//To avoid duplicate typedefs from typedef in amr-nb
#define typedef_h
#endif
#include <amrwb/enc_if.h>
#include <amrwb/dec_if.h>
#include <amrwb/if_rom.h>
/* Common code for fixed and float version*/
typedef struct AMRWB_bitrates
{
int rate;
int mode;
} AMRWB_bitrates;
static int getWBBitrateMode(int bitrate)
{
/* make the correspondance between bitrate and mode */
AMRWB_bitrates rates[]={ {6600,0},
{8850,1},
{12650,2},
{14250,3},
{15850,4},
{18250,5},
{19850,6},
{23050,7},
{23850,8},
};
int i;
for(i=0;i<9;i++)
{
if(rates[i].rate==bitrate)
{
return rates[i].mode;
}
}
/* no bitrate matching, return an error */
return -1;
}
typedef struct AMRWBContext {
int frameCount;
void *state;
int mode;
Word16 allow_dtx;
} AMRWBContext;
static int amr_wb_encode_init(AVCodecContext * avctx)
{
AMRWBContext *s = avctx->priv_data;
s->frameCount=0;
if(avctx->sample_rate!=16000)
{
av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n");
return -1;
}
if(avctx->channels!=1)
{
av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
return -1;
}
if((s->mode=getWBBitrateMode(avctx->bit_rate))<0)
{
av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported);
return -1;
}
avctx->frame_size=320;
avctx->coded_frame= avcodec_alloc_frame();
s->state = E_IF_init();
s->allow_dtx=0;
return 0;
}
static int amr_wb_encode_close(AVCodecContext * avctx)
{
AMRWBContext *s = avctx->priv_data;
E_IF_exit(s->state);
av_freep(&avctx->coded_frame);
s->frameCount++;
return 0;
}
static int amr_wb_encode_frame(AVCodecContext *avctx,
unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
{
AMRWBContext *s = avctx->priv_data;
int size;
if((s->mode=getWBBitrateMode(avctx->bit_rate))<0)
{
av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported);
return -1;
}
size = E_IF_encode(s->state, s->mode, data, frame, s->allow_dtx);
return size;
}
static int amr_wb_decode_init(AVCodecContext * avctx)
{
AMRWBContext *s = avctx->priv_data;
s->frameCount=0;
s->state = D_IF_init();
amr_decode_fix_avctx(avctx);
if(avctx->channels > 1)
{
av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
return -1;
}
return 0;
}
static int amr_wb_decode_frame(AVCodecContext * avctx,
void *data, int *data_size,
uint8_t * buf, int buf_size)
{
AMRWBContext *s = avctx->priv_data;
uint8_t*amrData=buf;
int mode;
int packet_size;
static const uint8_t block_size[16] = {18, 23, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
if(buf_size==0) {
/* nothing to do */
return 0;
}
mode = (amrData[0] >> 3) & 0x000F;
packet_size = block_size[mode];
if(packet_size > buf_size) {
av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", buf_size, packet_size+1);
return -1;
}
s->frameCount++;
D_IF_decode( s->state, amrData, data, _good_frame);
*data_size=320*2;
return packet_size;
}
static int amr_wb_decode_close(AVCodecContext * avctx)
{
AMRWBContext *s = avctx->priv_data;
D_IF_exit(s->state);
return 0;
}
AVCodec libamr_wb_decoder =
{
"libamr_wb",
CODEC_TYPE_AUDIO,
CODEC_ID_AMR_WB,
sizeof(AMRWBContext),
amr_wb_decode_init,
NULL,
amr_wb_decode_close,
amr_wb_decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("libamr-wb Adaptive Multi-Rate (AMR) Wide-Band"),
};
AVCodec libamr_wb_encoder =
{
"libamr_wb",
CODEC_TYPE_AUDIO,
CODEC_ID_AMR_WB,
sizeof(AMRWBContext),
amr_wb_encode_init,
amr_wb_encode_frame,
amr_wb_encode_close,
NULL,
.sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
.long_name = NULL_IF_CONFIG_SMALL("libamr-wb Adaptive Multi-Rate (AMR) Wide-Band"),
};
#endif //CONFIG_LIBAMR_WB
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