2 * AMR Audio decoder stub
3 * Copyright (c) 2003 the ffmpeg project
5 * This file is part of FFmpeg.
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.
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.
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
23 * Adaptive Multi-Rate (AMR) Audio decoder stub.
25 * This code implements both an AMR-NarrowBand (AMR-NB) and an AMR-WideBand
26 * (AMR-WB) audio encoder/decoder through external reference code from
27 * http://www.3gpp.org/. The license of the code from 3gpp is unclear so you
28 * have to download the code separately. Two versions exists: One fixed-point
29 * and one floating-point. For some reason the float encoder is significantly
30 * faster at least on a P4 1.5GHz (0.9s instead of 9.9s on a 30s audio clip
31 * at MR102). Both float and fixed point are supported for AMR-NB, but only
37 * The float version (default) can be downloaded from:
38 * http://www.3gpp.org/ftp/Specs/archive/26_series/26.104/26104-610.zip
40 * \subsection Specification
41 * The specification for AMR-NB can be found in TS 26.071
42 * (http://www.3gpp.org/ftp/Specs/html-info/26071.htm) and some other
43 * info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm.
48 * The reference code can be downloaded from:
49 * http://www.3gpp.org/ftp/Specs/archive/26_series/26.204/26204-600.zip
51 * \subsection Specification
52 * The specification for AMR-WB can be found in TS 26.171
53 * (http://www.3gpp.org/ftp/Specs/html-info/26171.htm) and some other
54 * info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm.
60 #include <amrnb/interf_dec.h>
61 #include <amrnb/interf_enc.h>
63 static const char nb_bitrate_unsupported[] =
64 "bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k\n";
65 static const char wb_bitrate_unsupported[] =
66 "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";
68 /* Common code for fixed and float version*/
69 typedef struct AMR_bitrates
75 /* Match desired bitrate */
76 static int getBitrateMode(int bitrate)
78 /* make the correspondance between bitrate and mode */
79 AMR_bitrates rates[]={ {4750,MR475},
92 if(rates[i].rate==bitrate)
97 /* no bitrate matching, return an error */
101 static void amr_decode_fix_avctx(AVCodecContext * avctx)
103 const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
105 if(avctx->sample_rate == 0)
107 avctx->sample_rate = 8000 * is_amr_wb;
110 if(avctx->channels == 0)
115 avctx->frame_size = 160 * is_amr_wb;
116 avctx->sample_fmt = SAMPLE_FMT_S16;
121 typedef struct AMRContext {
128 static av_cold int amr_nb_decode_init(AVCodecContext * avctx)
130 AMRContext *s = avctx->priv_data;
133 s->decState=Decoder_Interface_init();
136 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\r\n");
140 amr_decode_fix_avctx(avctx);
142 if(avctx->channels > 1)
144 av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
151 static av_cold int amr_nb_decode_close(AVCodecContext * avctx)
153 AMRContext *s = avctx->priv_data;
155 Decoder_Interface_exit(s->decState);
159 static int amr_nb_decode_frame(AVCodecContext * avctx,
160 void *data, int *data_size,
163 const uint8_t *buf = avpkt->data;
164 int buf_size = avpkt->size;
165 AMRContext *s = avctx->priv_data;
166 const uint8_t*amrData=buf;
167 static const uint8_t block_size[16]={ 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
171 /* av_log(NULL,AV_LOG_DEBUG,"amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",buf,buf_size,s->frameCount); */
173 dec_mode = (buf[0] >> 3) & 0x000F;
174 packet_size = block_size[dec_mode]+1;
176 if(packet_size > buf_size) {
177 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", buf_size, packet_size);
182 /* 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]); */
184 Decoder_Interface_Decode(s->decState, amrData, data, 0);
190 AVCodec libamr_nb_decoder =
200 .long_name = NULL_IF_CONFIG_SMALL("libamr-nb Adaptive Multi-Rate (AMR) Narrow-Band"),
203 static av_cold int amr_nb_encode_init(AVCodecContext * avctx)
205 AMRContext *s = avctx->priv_data;
209 if(avctx->sample_rate!=8000)
211 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
215 if(avctx->channels!=1)
217 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
221 avctx->frame_size=160;
222 avctx->coded_frame= avcodec_alloc_frame();
224 s->enstate=Encoder_Interface_init(0);
227 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
231 if((s->enc_bitrate=getBitrateMode(avctx->bit_rate))<0)
233 av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
240 static av_cold int amr_nb_encode_close(AVCodecContext * avctx)
242 AMRContext *s = avctx->priv_data;
244 Encoder_Interface_exit(s->enstate);
245 av_freep(&avctx->coded_frame);
249 static int amr_nb_encode_frame(AVCodecContext *avctx,
250 unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
252 AMRContext *s = avctx->priv_data;
255 if((s->enc_bitrate=getBitrateMode(avctx->bit_rate))<0)
257 av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
261 written = Encoder_Interface_Encode(s->enstate,
266 /* 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] ); */
271 AVCodec libamr_nb_encoder =
281 .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
282 .long_name = NULL_IF_CONFIG_SMALL("libamr-nb Adaptive Multi-Rate (AMR) Narrow-Band"),
287 /* -----------AMR wideband ------------*/
291 //To avoid duplicate typedefs from typedef in amr-nb
295 #include <amrwb/dec_if.h>
296 #include <amrwb/if_rom.h>
298 /* Common code for fixed and float version*/
299 typedef struct AMRWB_bitrates
305 typedef struct AMRWBContext {
312 #if CONFIG_LIBAMR_WB_ENCODER
314 #include <amrwb/enc_if.h>
316 static int getWBBitrateMode(int bitrate)
318 /* make the correspondance between bitrate and mode */
319 AMRWB_bitrates rates[]={ {6600,0},
333 if(rates[i].rate==bitrate)
335 return rates[i].mode;
338 /* no bitrate matching, return an error */
342 static av_cold int amr_wb_encode_init(AVCodecContext * avctx)
344 AMRWBContext *s = avctx->priv_data;
348 if(avctx->sample_rate!=16000)
350 av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n");
354 if(avctx->channels!=1)
356 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
360 if((s->mode=getWBBitrateMode(avctx->bit_rate))<0)
362 av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported);
366 avctx->frame_size=320;
367 avctx->coded_frame= avcodec_alloc_frame();
369 s->state = E_IF_init();
375 static int amr_wb_encode_close(AVCodecContext * avctx)
377 AMRWBContext *s = avctx->priv_data;
380 av_freep(&avctx->coded_frame);
385 static int amr_wb_encode_frame(AVCodecContext *avctx,
386 unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
388 AMRWBContext *s = avctx->priv_data;
391 if((s->mode=getWBBitrateMode(avctx->bit_rate))<0)
393 av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported);
396 size = E_IF_encode(s->state, s->mode, data, frame, s->allow_dtx);
400 AVCodec libamr_wb_encoder =
405 sizeof(AMRWBContext),
410 .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
411 .long_name = NULL_IF_CONFIG_SMALL("libamr-wb Adaptive Multi-Rate (AMR) Wide-Band"),
416 static av_cold int amr_wb_decode_init(AVCodecContext * avctx)
418 AMRWBContext *s = avctx->priv_data;
421 s->state = D_IF_init();
423 amr_decode_fix_avctx(avctx);
425 if(avctx->channels > 1)
427 av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
434 static int amr_wb_decode_frame(AVCodecContext * avctx,
435 void *data, int *data_size,
438 const uint8_t *buf = avpkt->data;
439 int buf_size = avpkt->size;
440 AMRWBContext *s = avctx->priv_data;
441 const uint8_t*amrData=buf;
444 static const uint8_t block_size[16] = {18, 23, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
451 mode = (amrData[0] >> 3) & 0x000F;
452 packet_size = block_size[mode];
454 if(packet_size > buf_size) {
455 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", buf_size, packet_size+1);
460 D_IF_decode( s->state, amrData, data, _good_frame);
465 static int amr_wb_decode_close(AVCodecContext * avctx)
467 AMRWBContext *s = avctx->priv_data;
473 AVCodec libamr_wb_decoder =
478 sizeof(AMRWBContext),
483 .long_name = NULL_IF_CONFIG_SMALL("libamr-wb Adaptive Multi-Rate (AMR) Wide-Band"),
486 #endif //CONFIG_LIBAMR_WB