Remove useless check, patch by Benoit Fouet, benoit.fouet purplelabs com.
[libav.git] / libavcodec / amr.c
1 /*
2 * AMR Audio decoder stub
3 * Copyright (c) 2003 the ffmpeg project
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21 /*
22 This code implements amr-nb and amr-wb audio encoder/decoder through external reference
23 code from www.3gpp.org. The licence of the code from 3gpp is unclear so you
24 have to download the code separately. Two versions exists: One fixed-point
25 and one with floats. For some reason the float-encoder is significant faster
26 atleast on a P4 1.5GHz (0.9s instead of 9.9s on a 30s audio clip at MR102).
27 Both float and fixed point is supported for amr-nb, but only float for
28 amr-wb.
29
30 --AMR-NB--
31 The fixed-point (TS26.073) can be downloaded from:
32 http://www.3gpp.org/ftp/Specs/archive/26_series/26.073/26073-510.zip
33 Extract the soure into ffmpeg/libavcodec/amr
34 To use the fixed version run "./configure" with "--enable-amr_nb-fixed"
35
36 The float version (default) can be downloaded from:
37 http://www.3gpp.org/ftp/Specs/archive/26_series/26.104/26104-510.zip
38 Extract the soure into ffmpeg/libavcodec/amr_float
39
40 The specification for amr-nb can be found in TS 26.071
41 (http://www.3gpp.org/ftp/Specs/html-info/26071.htm) and some other
42 info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm
43
44 --AMR-WB--
45 The reference code can be downloaded from:
46 http://www.3gpp.org/ftp/Specs/archive/26_series/26.204/26204-510.zip
47 It should be extracted to "libavcodec/amrwb_float". Enable it with
48 "--enable-amr_wb".
49
50 The specification for amr-wb can be downloaded from:
51 http://www.3gpp.org/ftp/Specs/archive/26_series/26.171/26171-500.zip
52
53 If someone want to use the fixed point version it can be downloaded
54 from: http://www.3gpp.org/ftp/Specs/archive/26_series/26.173/26173-571.zip
55
56 */
57
58 #include "avcodec.h"
59
60 #ifdef CONFIG_AMR_NB_FIXED
61
62 #define MMS_IO
63
64 #include "amr/sp_dec.h"
65 #include "amr/d_homing.h"
66 #include "amr/typedef.h"
67 #include "amr/sp_enc.h"
68 #include "amr/sid_sync.h"
69 #include "amr/e_homing.h"
70
71 #else
72 #include "amr_float/interf_dec.h"
73 #include "amr_float/interf_enc.h"
74 #endif
75
76 /* Common code for fixed and float version*/
77 typedef struct AMR_bitrates
78 {
79 int startrate;
80 int stoprate;
81 enum Mode mode;
82
83 } AMR_bitrates;
84
85 /* Match desired bitrate with closest one*/
86 static enum Mode getBitrateMode(int bitrate)
87 {
88 /* Adjusted so that all bitrates can be used from commandline where
89 only a multiple of 1000 can be specified*/
90 AMR_bitrates rates[]={ {0,4999,MR475}, //4
91 {5000,5899,MR515},//5
92 {5900,6699,MR59},//6
93 {6700,7000,MR67},//7
94 {7001,7949,MR74},//8
95 {7950,9999,MR795},//9
96 {10000,11999,MR102},//10
97 {12000,64000,MR122},//12
98
99 };
100 int i;
101 for(i=0;i<8;i++)
102 {
103 if(rates[i].startrate<=bitrate && rates[i].stoprate>=bitrate)
104 {
105 return(rates[i].mode);
106 }
107 }
108 /*Return highest possible*/
109 return(MR122);
110 }
111
112 static void amr_decode_fix_avctx(AVCodecContext * avctx)
113 {
114 const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
115
116 if(avctx->sample_rate == 0)
117 {
118 avctx->sample_rate = 8000 * is_amr_wb;
119 }
120
121 if(avctx->channels == 0)
122 {
123 avctx->channels = 1;
124 }
125
126 avctx->frame_size = 160 * is_amr_wb;
127 }
128
129 #ifdef CONFIG_AMR_NB_FIXED
130 /* fixed point version*/
131 /* frame size in serial bitstream file (frame type + serial stream + flags) */
132 #define SERIAL_FRAMESIZE (1+MAX_SERIAL_SIZE+5)
133
134 typedef struct AMRContext {
135 int frameCount;
136 Speech_Decode_FrameState *speech_decoder_state;
137 enum RXFrameType rx_type;
138 enum Mode mode;
139 Word16 reset_flag;
140 Word16 reset_flag_old;
141
142 enum Mode enc_bitrate;
143 Speech_Encode_FrameState *enstate;
144 sid_syncState *sidstate;
145 enum TXFrameType tx_frametype;
146
147
148 } AMRContext;
149
150 static int amr_nb_decode_init(AVCodecContext * avctx)
151 {
152 AMRContext *s = avctx->priv_data;
153 s->frameCount=0;
154 s->speech_decoder_state=NULL;
155 s->rx_type = (enum RXFrameType)0;
156 s->mode= (enum Mode)0;
157 s->reset_flag=0;
158 s->reset_flag_old=1;
159
160 if(Speech_Decode_Frame_init(&s->speech_decoder_state, "Decoder"))
161 {
162 av_log(avctx, AV_LOG_ERROR, "Speech_Decode_Frame_init error\n");
163 return -1;
164 }
165
166 amr_decode_fix_avctx(avctx);
167
168 if(avctx->channels > 1)
169 {
170 av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
171 return -1;
172 }
173
174 return 0;
175 }
176
177 static int amr_nb_encode_init(AVCodecContext * avctx)
178 {
179 AMRContext *s = avctx->priv_data;
180 s->frameCount=0;
181 s->speech_decoder_state=NULL;
182 s->rx_type = (enum RXFrameType)0;
183 s->mode= (enum Mode)0;
184 s->reset_flag=0;
185 s->reset_flag_old=1;
186
187 if(avctx->sample_rate!=8000)
188 {
189 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
190 return -1;
191 }
192
193 if(avctx->channels!=1)
194 {
195 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
196 return -1;
197 }
198
199 avctx->frame_size=160;
200 avctx->coded_frame= avcodec_alloc_frame();
201
202 if(Speech_Encode_Frame_init(&s->enstate, 0, "encoder") || sid_sync_init (&s->sidstate))
203 {
204 av_log(avctx, AV_LOG_ERROR, "Speech_Encode_Frame_init error\n");
205 return -1;
206 }
207
208 s->enc_bitrate=getBitrateMode(avctx->bit_rate);
209
210 return 0;
211 }
212
213 static int amr_nb_encode_close(AVCodecContext * avctx)
214 {
215 AMRContext *s = avctx->priv_data;
216 Speech_Encode_Frame_exit(&s->enstate);
217 sid_sync_exit (&s->sidstate);
218 av_freep(&avctx->coded_frame);
219 return 0;
220 }
221
222 static int amr_nb_decode_close(AVCodecContext * avctx)
223 {
224 AMRContext *s = avctx->priv_data;
225 Speech_Decode_Frame_exit(&s->speech_decoder_state);
226 return 0;
227 }
228
229 static int amr_nb_decode_frame(AVCodecContext * avctx,
230 void *data, int *data_size,
231 uint8_t * buf, int buf_size)
232 {
233 AMRContext *s = avctx->priv_data;
234
235 uint8_t*amrData=buf;
236 int offset=0;
237
238 UWord8 toc, q, ft;
239
240 Word16 serial[SERIAL_FRAMESIZE]; /* coded bits */
241 Word16 *synth;
242 UWord8 *packed_bits;
243
244 static Word16 packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
245 int i;
246
247 //printf("amr_decode_frame data_size=%i buf=0x%X buf_size=%d frameCount=%d!!\n",*data_size,buf,buf_size,s->frameCount);
248
249 synth=data;
250
251 // while(offset<buf_size)
252 {
253 toc=amrData[offset];
254 /* read rest of the frame based on ToC byte */
255 q = (toc >> 2) & 0x01;
256 ft = (toc >> 3) & 0x0F;
257
258 //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]);
259
260 offset++;
261
262 packed_bits=amrData+offset;
263
264 offset+=packed_size[ft];
265
266 //Unsort and unpack bits
267 s->rx_type = UnpackBits(q, ft, packed_bits, &s->mode, &serial[1]);
268
269 //We have a new frame
270 s->frameCount++;
271
272 if (s->rx_type == RX_NO_DATA)
273 {
274 s->mode = s->speech_decoder_state->prev_mode;
275 }
276 else {
277 s->speech_decoder_state->prev_mode = s->mode;
278 }
279
280 /* if homed: check if this frame is another homing frame */
281 if (s->reset_flag_old == 1)
282 {
283 /* only check until end of first subframe */
284 s->reset_flag = decoder_homing_frame_test_first(&serial[1], s->mode);
285 }
286 /* produce encoder homing frame if homed & input=decoder homing frame */
287 if ((s->reset_flag != 0) && (s->reset_flag_old != 0))
288 {
289 for (i = 0; i < L_FRAME; i++)
290 {
291 synth[i] = EHF_MASK;
292 }
293 }
294 else
295 {
296 /* decode frame */
297 Speech_Decode_Frame(s->speech_decoder_state, s->mode, &serial[1], s->rx_type, synth);
298 }
299
300 //Each AMR-frame results in 160 16-bit samples
301 *data_size+=160*2;
302 synth+=160;
303
304 /* if not homed: check whether current frame is a homing frame */
305 if (s->reset_flag_old == 0)
306 {
307 /* check whole frame */
308 s->reset_flag = decoder_homing_frame_test(&serial[1], s->mode);
309 }
310 /* reset decoder if current frame is a homing frame */
311 if (s->reset_flag != 0)
312 {
313 Speech_Decode_Frame_reset(s->speech_decoder_state);
314 }
315 s->reset_flag_old = s->reset_flag;
316
317 }
318 return offset;
319 }
320
321
322 static int amr_nb_encode_frame(AVCodecContext *avctx,
323 unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
324 {
325 short serial_data[250] = {0};
326
327 AMRContext *s = avctx->priv_data;
328 int written;
329
330 s->reset_flag = encoder_homing_frame_test(data);
331
332 Speech_Encode_Frame(s->enstate, s->enc_bitrate, data, &serial_data[1], &s->mode);
333
334 /* add frame type and mode */
335 sid_sync (s->sidstate, s->mode, &s->tx_frametype);
336
337 written = PackBits(s->mode, s->enc_bitrate, s->tx_frametype, &serial_data[1], frame);
338
339 if (s->reset_flag != 0)
340 {
341 Speech_Encode_Frame_reset(s->enstate);
342 sid_sync_reset(s->sidstate);
343 }
344 return written;
345 }
346
347
348 #elif defined(CONFIG_AMR_NB) /* Float point version*/
349
350 typedef struct AMRContext {
351 int frameCount;
352 void * decState;
353 int *enstate;
354 enum Mode enc_bitrate;
355 } AMRContext;
356
357 static int amr_nb_decode_init(AVCodecContext * avctx)
358 {
359 AMRContext *s = avctx->priv_data;
360 s->frameCount=0;
361 s->decState=Decoder_Interface_init();
362 if(!s->decState)
363 {
364 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\r\n");
365 return -1;
366 }
367
368 amr_decode_fix_avctx(avctx);
369
370 if(avctx->channels > 1)
371 {
372 av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
373 return -1;
374 }
375
376 return 0;
377 }
378
379 static int amr_nb_encode_init(AVCodecContext * avctx)
380 {
381 AMRContext *s = avctx->priv_data;
382 s->frameCount=0;
383
384 if(avctx->sample_rate!=8000)
385 {
386 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
387 return -1;
388 }
389
390 if(avctx->channels!=1)
391 {
392 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
393 return -1;
394 }
395
396 avctx->frame_size=160;
397 avctx->coded_frame= avcodec_alloc_frame();
398
399 s->enstate=Encoder_Interface_init(0);
400 if(!s->enstate)
401 {
402 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
403 return -1;
404 }
405
406 s->enc_bitrate=getBitrateMode(avctx->bit_rate);
407
408 return 0;
409 }
410
411 static int amr_nb_decode_close(AVCodecContext * avctx)
412 {
413 AMRContext *s = avctx->priv_data;
414 Decoder_Interface_exit(s->decState);
415 return 0;
416 }
417
418 static int amr_nb_encode_close(AVCodecContext * avctx)
419 {
420 AMRContext *s = avctx->priv_data;
421 Encoder_Interface_exit(s->enstate);
422 av_freep(&avctx->coded_frame);
423 return 0;
424 }
425
426 static int amr_nb_decode_frame(AVCodecContext * avctx,
427 void *data, int *data_size,
428 uint8_t * buf, int buf_size)
429 {
430 AMRContext *s = (AMRContext*)avctx->priv_data;
431
432 uint8_t*amrData=buf;
433 static short block_size[16]={ 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
434 enum Mode dec_mode;
435 int packet_size;
436
437 /* av_log(NULL,AV_LOG_DEBUG,"amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",buf,buf_size,s->frameCount); */
438
439 dec_mode = (buf[0] >> 3) & 0x000F;
440 packet_size = block_size[dec_mode]+1;
441
442 if(packet_size > buf_size) {
443 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", buf_size, packet_size);
444 return -1;
445 }
446
447 s->frameCount++;
448 /* 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]); */
449 /* call decoder */
450 Decoder_Interface_Decode(s->decState, amrData, data, 0);
451 *data_size=160*2;
452
453 return packet_size;
454 }
455
456 static int amr_nb_encode_frame(AVCodecContext *avctx,
457 unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
458 {
459 AMRContext *s = (AMRContext*)avctx->priv_data;
460 int written;
461
462 s->enc_bitrate=getBitrateMode(avctx->bit_rate);
463
464 written = Encoder_Interface_Encode(s->enstate,
465 s->enc_bitrate,
466 data,
467 frame,
468 0);
469 /* 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] ); */
470
471 return written;
472 }
473
474 #endif
475
476 #if defined(CONFIG_AMR_NB) || defined(CONFIG_AMR_NB_FIXED)
477
478 AVCodec amr_nb_decoder =
479 {
480 "amr_nb",
481 CODEC_TYPE_AUDIO,
482 CODEC_ID_AMR_NB,
483 sizeof(AMRContext),
484 amr_nb_decode_init,
485 NULL,
486 amr_nb_decode_close,
487 amr_nb_decode_frame,
488 };
489
490 AVCodec amr_nb_encoder =
491 {
492 "amr_nb",
493 CODEC_TYPE_AUDIO,
494 CODEC_ID_AMR_NB,
495 sizeof(AMRContext),
496 amr_nb_encode_init,
497 amr_nb_encode_frame,
498 amr_nb_encode_close,
499 NULL,
500 };
501
502 #endif
503
504 /* -----------AMR wideband ------------*/
505 #ifdef CONFIG_AMR_WB
506
507 #ifdef _TYPEDEF_H
508 //To avoid duplicate typedefs from typdef in amr-nb
509 #define typedef_h
510 #endif
511
512 #include "amrwb_float/enc_if.h"
513 #include "amrwb_float/dec_if.h"
514
515 /* Common code for fixed and float version*/
516 typedef struct AMRWB_bitrates
517 {
518 int startrate;
519 int stoprate;
520 int mode;
521
522 } AMRWB_bitrates;
523
524 static int getWBBitrateMode(int bitrate)
525 {
526 /* Adjusted so that all bitrates can be used from commandline where
527 only a multiple of 1000 can be specified*/
528 AMRWB_bitrates rates[]={ {0,7999,0}, //6.6kHz
529 {8000,9999,1},//8.85
530 {10000,13000,2},//12.65
531 {13001,14999,3},//14.25
532 {15000,17000,4},//15.85
533 {17001,18000,5},//18.25
534 {18001,22000,6},//19.85
535 {22001,23000,7},//23.05
536 {23001,24000,8},//23.85
537
538 };
539 int i;
540
541 for(i=0;i<9;i++)
542 {
543 if(rates[i].startrate<=bitrate && rates[i].stoprate>=bitrate)
544 {
545 return(rates[i].mode);
546 }
547 }
548 /*Return highest possible*/
549 return(8);
550 }
551
552
553 typedef struct AMRWBContext {
554 int frameCount;
555 void *state;
556 int mode;
557 Word16 allow_dtx;
558 } AMRWBContext;
559
560 static int amr_wb_encode_init(AVCodecContext * avctx)
561 {
562 AMRWBContext *s = (AMRWBContext*)avctx->priv_data;
563 s->frameCount=0;
564
565 if(avctx->sample_rate!=16000)
566 {
567 av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n");
568 return -1;
569 }
570
571 if(avctx->channels!=1)
572 {
573 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
574 return -1;
575 }
576
577 avctx->frame_size=320;
578 avctx->coded_frame= avcodec_alloc_frame();
579
580 s->state = E_IF_init();
581 s->mode=getWBBitrateMode(avctx->bit_rate);
582 s->allow_dtx=0;
583
584 return 0;
585 }
586
587 static int amr_wb_encode_close(AVCodecContext * avctx)
588 {
589 AMRWBContext *s = (AMRWBContext*) avctx->priv_data;
590 E_IF_exit(s->state);
591 av_freep(&avctx->coded_frame);
592 s->frameCount++;
593 return 0;
594 }
595
596 static int amr_wb_encode_frame(AVCodecContext *avctx,
597 unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
598 {
599 AMRWBContext *s;
600 int size;
601 s = (AMRWBContext*) avctx->priv_data;
602 s->mode=getWBBitrateMode(avctx->bit_rate);
603 size = E_IF_encode(s->state, s->mode, data, frame, s->allow_dtx);
604 return size;
605 }
606
607 static int amr_wb_decode_init(AVCodecContext * avctx)
608 {
609 AMRWBContext *s = (AMRWBContext *)avctx->priv_data;
610 s->frameCount=0;
611 s->state = D_IF_init();
612
613 amr_decode_fix_avctx(avctx);
614
615 if(avctx->channels > 1)
616 {
617 av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
618 return -1;
619 }
620
621 return 0;
622 }
623
624 extern const UWord8 block_size[];
625
626 static int amr_wb_decode_frame(AVCodecContext * avctx,
627 void *data, int *data_size,
628 uint8_t * buf, int buf_size)
629 {
630 AMRWBContext *s = (AMRWBContext*)avctx->priv_data;
631
632 uint8_t*amrData=buf;
633 int mode;
634 int packet_size;
635
636 if(buf_size==0) {
637 /* nothing to do */
638 return 0;
639 }
640
641 mode = (amrData[0] >> 3) & 0x000F;
642 packet_size = block_size[mode];
643
644 if(packet_size > buf_size) {
645 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", buf_size, packet_size+1);
646 return -1;
647 }
648
649 s->frameCount++;
650 D_IF_decode( s->state, amrData, data, _good_frame);
651 *data_size=320*2;
652 return packet_size;
653 }
654
655 static int amr_wb_decode_close(AVCodecContext * avctx)
656 {
657 AMRWBContext *s = (AMRWBContext *)avctx->priv_data;
658 D_IF_exit(s->state);
659 return 0;
660 }
661
662 AVCodec amr_wb_decoder =
663 {
664 "amr_wb",
665 CODEC_TYPE_AUDIO,
666 CODEC_ID_AMR_WB,
667 sizeof(AMRWBContext),
668 amr_wb_decode_init,
669 NULL,
670 amr_wb_decode_close,
671 amr_wb_decode_frame,
672 };
673
674 AVCodec amr_wb_encoder =
675 {
676 "amr_wb",
677 CODEC_TYPE_AUDIO,
678 CODEC_ID_AMR_WB,
679 sizeof(AMRWBContext),
680 amr_wb_encode_init,
681 amr_wb_encode_frame,
682 amr_wb_encode_close,
683 NULL,
684 };
685
686 #endif //CONFIG_AMR_WB