2
* AMR Audio decoder stub
3
* Copyright (c) 2003 the ffmpeg project
5
* This library is free software; you can redistribute it and/or
6
* modify it under the terms of the GNU Lesser General Public
7
* License as published by the Free Software Foundation; either
8
* version 2 of the License, or (at your option) any later version.
10
* This library is distributed in the hope that it will be useful,
11
* but WITHOUT ANY WARRANTY; without even the implied warranty of
12
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13
* Lesser General Public License for more details.
15
* You should have received a copy of the GNU Lesser General Public
16
* License along with this library; if not, write to the Free Software
17
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20
This code implements amr-nb audio encoder/decoder through external reference
21
code from www.3gpp.org. The licence of the code from 3gpp is unclear so you
22
have to download the code separately. Two versions exists: One fixed-point
23
and one with floats. For some reason the float-encoder is significant faster
24
atleast on a P4 1.5GHz (0.9s instead of 9.9s on a 30s audio clip at MR102).
26
The fixed-point (TS26.073) can be downloaded from:
27
http://www.3gpp.org/ftp/Specs/latest/Rel-5/26_series/26073-510.zip
28
Extract the soure into ffmpeg/libavcodec/amr
29
To use the float version run "./configure" with "--enable-amr-nb-fixed"
31
The float version (default) can be downloaded from:
32
http://www.3gpp.org/ftp/Specs/latest/Rel-5/26_series/26104-510.zip
33
Extract the soure into ffmpeg/libavcodec/amr_float
35
The specification for amr-nb can be found in TS 26.071
36
(http://www.3gpp.org/ftp/Specs/html-info/26071.htm) and some other
37
info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm
39
In the future support for AMR-WB might also be included here.
40
Reference code exist in TS26.173 and TS 26.204.
44
//#define AMR_NB_FIXED
45
#include "../config.h"
52
#include "amr/sp_dec.h"
53
#include "amr/d_homing.h"
54
#include "amr/typedef.h"
55
#include "amr/sp_enc.h"
56
#include "amr/sid_sync.h"
57
#include "amr/e_homing.h"
60
#include "amr_float/interf_dec.h"
61
#include "amr_float/interf_enc.h"
64
/* Common code for fixed and float version*/
65
typedef struct AMR_bitrates
73
/* Match desired bitrate with closest one*/
74
static enum Mode getBitrateMode(int bitrate)
76
/* Adjusted so that all bitrates can be used from commandline where
77
only a multiple of 1000 can be specified*/
78
AMR_bitrates rates[]={ {0,4999,MR475}, //4
84
{10000,11999,MR102},//10
85
{12000,64000,MR122},//12
89
for(i=0;i<sizeof(rates);i++)
91
if(rates[i].startrate<=bitrate && rates[i].stoprate>=bitrate)
93
return(rates[i].mode);
96
/*Return highest possible*/
101
/* fixed point version*/
102
/* frame size in serial bitstream file (frame type + serial stream + flags) */
103
#define SERIAL_FRAMESIZE (1+MAX_SERIAL_SIZE+5)
105
typedef struct AMRContext {
107
Speech_Decode_FrameState *speech_decoder_state;
108
enum RXFrameType rx_type;
111
Word16 reset_flag_old;
113
enum Mode enc_bitrate;
114
Speech_Encode_FrameState *enstate;
115
sid_syncState *sidstate;
116
enum TXFrameType tx_frametype;
121
static int amr_nb_decode_init(AVCodecContext * avctx)
123
AMRContext *s = avctx->priv_data;
125
s->speech_decoder_state=NULL;
126
s->rx_type = (enum RXFrameType)0;
127
s->mode= (enum Mode)0;
131
if(Speech_Decode_Frame_init(&s->speech_decoder_state, "Decoder"))
133
printf("Speech_Decode_Frame_init error\n");
139
static int amr_nb_encode_init(AVCodecContext * avctx)
141
AMRContext *s = avctx->priv_data;
143
s->speech_decoder_state=NULL;
144
s->rx_type = (enum RXFrameType)0;
145
s->mode= (enum Mode)0;
149
if(avctx->sample_rate!=8000)
152
printf("Only 8000Hz sample rate supported\n");
157
if(avctx->channels!=1)
160
printf("Only mono supported\n");
165
avctx->frame_size=160;
166
avctx->coded_frame= avcodec_alloc_frame();
168
if(Speech_Encode_Frame_init(&s->enstate, 0, "encoder") || sid_sync_init (&s->sidstate))
171
printf("Speech_Encode_Frame_init error\n");
176
s->enc_bitrate=getBitrateMode(avctx->bit_rate);
181
static int amr_nb_encode_close(AVCodecContext * avctx)
183
AMRContext *s = avctx->priv_data;
184
Speech_Encode_Frame_exit(&s->enstate);
185
sid_sync_exit (&s->sidstate);
186
av_freep(&avctx->coded_frame);
190
static int amr_nb_decode_close(AVCodecContext * avctx)
192
AMRContext *s = avctx->priv_data;
193
Speech_Decode_Frame_exit(&s->speech_decoder_state);
197
static int amr_nb_decode_frame(AVCodecContext * avctx,
198
void *data, int *data_size,
199
uint8_t * buf, int buf_size)
201
AMRContext *s = avctx->priv_data;
208
Word16 serial[SERIAL_FRAMESIZE]; /* coded bits */
213
static Word16 packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
216
//printf("amr_decode_frame data_size=%i buf=0x%X buf_size=%d frameCount=%d!!\n",*data_size,buf,buf_size,s->frameCount);
220
// while(offset<buf_size)
223
/* read rest of the frame based on ToC byte */
224
q = (toc >> 2) & 0x01;
225
ft = (toc >> 3) & 0x0F;
227
//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]);
231
packed_bits=amrData+offset;
233
offset+=packed_size[ft];
235
//Unsort and unpack bits
236
s->rx_type = UnpackBits(q, ft, packed_bits, &s->mode, &serial[1]);
238
//We have a new frame
241
if (s->rx_type == RX_NO_DATA)
243
s->mode = s->speech_decoder_state->prev_mode;
246
s->speech_decoder_state->prev_mode = s->mode;
249
/* if homed: check if this frame is another homing frame */
250
if (s->reset_flag_old == 1)
252
/* only check until end of first subframe */
253
s->reset_flag = decoder_homing_frame_test_first(&serial[1], s->mode);
255
/* produce encoder homing frame if homed & input=decoder homing frame */
256
if ((s->reset_flag != 0) && (s->reset_flag_old != 0))
258
for (i = 0; i < L_FRAME; i++)
266
Speech_Decode_Frame(s->speech_decoder_state, s->mode, &serial[1], s->rx_type, synth);
269
//Each AMR-frame results in 160 16-bit samples
273
/* if not homed: check whether current frame is a homing frame */
274
if (s->reset_flag_old == 0)
276
/* check whole frame */
277
s->reset_flag = decoder_homing_frame_test(&serial[1], s->mode);
279
/* reset decoder if current frame is a homing frame */
280
if (s->reset_flag != 0)
282
Speech_Decode_Frame_reset(s->speech_decoder_state);
284
s->reset_flag_old = s->reset_flag;
291
static int amr_nb_encode_frame(AVCodecContext *avctx,
292
unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
294
short serial_data[250] = {0};
296
AMRContext *s = avctx->priv_data;
299
s->reset_flag = encoder_homing_frame_test(data);
301
Speech_Encode_Frame(s->enstate, s->enc_bitrate, data, &serial_data[1], &s->mode);
303
/* add frame type and mode */
304
sid_sync (s->sidstate, s->mode, &s->tx_frametype);
306
written = PackBits(s->mode, s->enc_bitrate, s->tx_frametype, &serial_data[1], frame);
308
if (s->reset_flag != 0)
310
Speech_Encode_Frame_reset(s->enstate);
311
sid_sync_reset(s->sidstate);
317
#else /* Float point version*/
319
typedef struct AMRContext {
323
enum Mode enc_bitrate;
326
static int amr_nb_decode_init(AVCodecContext * avctx)
328
AMRContext *s = avctx->priv_data;
330
s->decState=Decoder_Interface_init();
333
printf("Decoder_Interface_init error\r\n");
339
static int amr_nb_encode_init(AVCodecContext * avctx)
341
AMRContext *s = avctx->priv_data;
344
if(avctx->sample_rate!=8000)
347
printf("Only 8000Hz sample rate supported\n");
352
if(avctx->channels!=1)
355
printf("Only mono supported\n");
360
avctx->frame_size=160;
361
avctx->coded_frame= avcodec_alloc_frame();
363
s->enstate=Encoder_Interface_init(0);
366
printf("Encoder_Interface_init error\n");
370
s->enc_bitrate=getBitrateMode(avctx->bit_rate);
375
static int amr_nb_decode_close(AVCodecContext * avctx)
377
AMRContext *s = avctx->priv_data;
378
Decoder_Interface_exit(s->decState);
382
static int amr_nb_encode_close(AVCodecContext * avctx)
384
AMRContext *s = avctx->priv_data;
385
Encoder_Interface_exit(s->enstate);
386
av_freep(&avctx->coded_frame);
390
static int amr_nb_decode_frame(AVCodecContext * avctx,
391
void *data, int *data_size,
392
uint8_t * buf, int buf_size)
394
AMRContext *s = (AMRContext*)avctx->priv_data;
398
static short block_size[16]={ 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
403
//printf("amr_decode_frame data_size=%i buf=0x%X buf_size=%d frameCount=%d!!\n",*data_size,buf,buf_size,s->frameCount);
405
while(offset<buf_size)
407
dec_mode = (amrData[offset] >> 3) & 0x000F;
408
packet_size = block_size[dec_mode];
411
//printf("offset=%d, packet_size=%d amrData= 0x%X %X %X %X\n",offset,packet_size,amrData[offset],amrData[offset+1],amrData[offset+2],amrData[offset+3]);
413
Decoder_Interface_Decode(s->decState, &amrData[offset], data+*data_size, 0);
416
offset+=packet_size+1;
421
static int amr_nb_encode_frame(AVCodecContext *avctx,
422
unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
424
AMRContext *s = (AMRContext*)avctx->priv_data;
427
written = Encoder_Interface_Encode(s->enstate,
438
AVCodec amr_nb_decoder =
450
AVCodec amr_nb_encoder =