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libopencore-amr.c
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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 #include "libavutil/avstring.h"
24 #include "libavutil/common.h"
25 #include "libavutil/opt.h"
26 #include "avcodec.h"
27 #include "audio_frame_queue.h"
28 #include "internal.h"
29 
31 {
32  const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB);
33 
34  if (!avctx->sample_rate)
35  avctx->sample_rate = 8000 * is_amr_wb;
36 
37  if (avctx->channels > 1) {
38  av_log_missing_feature(avctx, "multi-channel AMR", 0);
39  return AVERROR_PATCHWELCOME;
40  }
41 
42  avctx->channels = 1;
45  return 0;
46 }
47 
48 #if CONFIG_LIBOPENCORE_AMRNB
49 
50 #include <opencore-amrnb/interf_dec.h>
51 #include <opencore-amrnb/interf_enc.h>
52 
53 typedef struct AMRContext {
55  void *dec_state;
56  void *enc_state;
57  int enc_bitrate;
58  int enc_mode;
59  int enc_dtx;
60  int enc_last_frame;
61  AudioFrameQueue afq;
62 } AMRContext;
63 
64 #if CONFIG_LIBOPENCORE_AMRNB_DECODER
65 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
66 {
67  AMRContext *s = avctx->priv_data;
68  int ret;
69 
70  if ((ret = amr_decode_fix_avctx(avctx)) < 0)
71  return ret;
72 
73  s->dec_state = Decoder_Interface_init();
74  if (!s->dec_state) {
75  av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
76  return -1;
77  }
78 
79  return 0;
80 }
81 
82 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
83 {
84  AMRContext *s = avctx->priv_data;
85 
86  Decoder_Interface_exit(s->dec_state);
87 
88  return 0;
89 }
90 
91 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
92  int *got_frame_ptr, AVPacket *avpkt)
93 {
94  AVFrame *frame = data;
95  const uint8_t *buf = avpkt->data;
96  int buf_size = avpkt->size;
97  AMRContext *s = avctx->priv_data;
98  static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
99  enum Mode dec_mode;
100  int packet_size, ret;
101 
102  av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
103  buf, buf_size, avctx->frame_number);
104 
105  /* get output buffer */
106  frame->nb_samples = 160;
107  if ((ret = ff_get_buffer(avctx, frame)) < 0) {
108  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
109  return ret;
110  }
111 
112  dec_mode = (buf[0] >> 3) & 0x000F;
113  packet_size = block_size[dec_mode] + 1;
114 
115  if (packet_size > buf_size) {
116  av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
117  buf_size, packet_size);
118  return AVERROR_INVALIDDATA;
119  }
120 
121  av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
122  packet_size, buf[0], buf[1], buf[2], buf[3]);
123  /* call decoder */
124  Decoder_Interface_Decode(s->dec_state, buf, (short *)frame->data[0], 0);
125 
126  *got_frame_ptr = 1;
127 
128  return packet_size;
129 }
130 
131 AVCodec ff_libopencore_amrnb_decoder = {
132  .name = "libopencore_amrnb",
133  .type = AVMEDIA_TYPE_AUDIO,
134  .id = AV_CODEC_ID_AMR_NB,
135  .priv_data_size = sizeof(AMRContext),
136  .init = amr_nb_decode_init,
137  .close = amr_nb_decode_close,
138  .decode = amr_nb_decode_frame,
139  .capabilities = CODEC_CAP_DR1,
140  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
141 };
142 #endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */
143 
144 #if CONFIG_LIBOPENCORE_AMRNB_ENCODER
145 /* Common code for fixed and float version*/
146 typedef struct AMR_bitrates {
147  int rate;
148  enum Mode mode;
149 } AMR_bitrates;
150 
151 /* Match desired bitrate */
152 static int get_bitrate_mode(int bitrate, void *log_ctx)
153 {
154  /* make the correspondance between bitrate and mode */
155  static const AMR_bitrates rates[] = {
156  { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
157  { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
158  };
159  int i, best = -1, min_diff = 0;
160  char log_buf[200];
161 
162  for (i = 0; i < 8; i++) {
163  if (rates[i].rate == bitrate)
164  return rates[i].mode;
165  if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
166  best = i;
167  min_diff = abs(rates[i].rate - bitrate);
168  }
169  }
170  /* no bitrate matching exactly, log a warning */
171  snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
172  for (i = 0; i < 8; i++)
173  av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
174  av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
175  av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
176 
177  return best;
178 }
179 
180 static const AVOption options[] = {
181  { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRContext, enc_dtx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
182  { NULL }
183 };
184 
185 static const AVClass class = {
186  "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
187 };
188 
189 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
190 {
191  AMRContext *s = avctx->priv_data;
192 
193  if (avctx->sample_rate != 8000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
194  av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
195  return AVERROR(ENOSYS);
196  }
197 
198  if (avctx->channels != 1) {
199  av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
200  return AVERROR(ENOSYS);
201  }
202 
203  avctx->frame_size = 160;
204  avctx->delay = 50;
205  ff_af_queue_init(avctx, &s->afq);
206 #if FF_API_OLD_ENCODE_AUDIO
207  avctx->coded_frame = avcodec_alloc_frame();
208  if (!avctx->coded_frame)
209  return AVERROR(ENOMEM);
210 #endif
211 
212  s->enc_state = Encoder_Interface_init(s->enc_dtx);
213  if (!s->enc_state) {
214  av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
215  av_freep(&avctx->coded_frame);
216  return -1;
217  }
218 
219  s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
220  s->enc_bitrate = avctx->bit_rate;
221 
222  return 0;
223 }
224 
225 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
226 {
227  AMRContext *s = avctx->priv_data;
228 
229  Encoder_Interface_exit(s->enc_state);
230  ff_af_queue_close(&s->afq);
231 #if FF_API_OLD_ENCODE_AUDIO
232  av_freep(&avctx->coded_frame);
233 #endif
234  return 0;
235 }
236 
237 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
238  const AVFrame *frame, int *got_packet_ptr)
239 {
240  AMRContext *s = avctx->priv_data;
241  int written, ret;
242  int16_t *flush_buf = NULL;
243  const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
244 
245  if (s->enc_bitrate != avctx->bit_rate) {
246  s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
247  s->enc_bitrate = avctx->bit_rate;
248  }
249 
250  if ((ret = ff_alloc_packet2(avctx, avpkt, 32)) < 0)
251  return ret;
252 
253  if (frame) {
254  if (frame->nb_samples < avctx->frame_size) {
255  flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
256  if (!flush_buf)
257  return AVERROR(ENOMEM);
258  memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
259  samples = flush_buf;
260  if (frame->nb_samples < avctx->frame_size - avctx->delay)
261  s->enc_last_frame = -1;
262  }
263  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
264  av_freep(&flush_buf);
265  return ret;
266  }
267  } else {
268  if (s->enc_last_frame < 0)
269  return 0;
270  flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
271  if (!flush_buf)
272  return AVERROR(ENOMEM);
273  samples = flush_buf;
274  s->enc_last_frame = -1;
275  }
276 
277  written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
278  avpkt->data, 0);
279  av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
280  written, s->enc_mode, avpkt->data[0]);
281 
282  /* Get the next frame pts/duration */
283  ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
284  &avpkt->duration);
285 
286  avpkt->size = written;
287  *got_packet_ptr = 1;
288  av_freep(&flush_buf);
289  return 0;
290 }
291 
292 AVCodec ff_libopencore_amrnb_encoder = {
293  .name = "libopencore_amrnb",
294  .type = AVMEDIA_TYPE_AUDIO,
295  .id = AV_CODEC_ID_AMR_NB,
296  .priv_data_size = sizeof(AMRContext),
297  .init = amr_nb_encode_init,
298  .encode2 = amr_nb_encode_frame,
299  .close = amr_nb_encode_close,
301  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
303  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
304  .priv_class = &class,
305 };
306 #endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */
307 
308 #endif /* CONFIG_LIBOPENCORE_AMRNB */
309 
310 /* -----------AMR wideband ------------*/
311 #if CONFIG_LIBOPENCORE_AMRWB_DECODER
312 
313 #include <opencore-amrwb/dec_if.h>
314 #include <opencore-amrwb/if_rom.h>
315 
316 typedef struct AMRWBContext {
317  void *state;
318 } AMRWBContext;
319 
320 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
321 {
322  AMRWBContext *s = avctx->priv_data;
323  int ret;
324 
325  if ((ret = amr_decode_fix_avctx(avctx)) < 0)
326  return ret;
327 
328  s->state = D_IF_init();
329 
330  return 0;
331 }
332 
333 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
334  int *got_frame_ptr, AVPacket *avpkt)
335 {
336  AVFrame *frame = data;
337  const uint8_t *buf = avpkt->data;
338  int buf_size = avpkt->size;
339  AMRWBContext *s = avctx->priv_data;
340  int mode, ret;
341  int packet_size;
342  static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
343 
344  /* get output buffer */
345  frame->nb_samples = 320;
346  if ((ret = ff_get_buffer(avctx, frame)) < 0) {
347  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
348  return ret;
349  }
350 
351  mode = (buf[0] >> 3) & 0x000F;
352  packet_size = block_size[mode];
353 
354  if (packet_size > buf_size) {
355  av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
356  buf_size, packet_size + 1);
357  return AVERROR_INVALIDDATA;
358  }
359  if (!packet_size) {
360  av_log(avctx, AV_LOG_ERROR, "amr packet_size invalid\n");
361  return AVERROR_INVALIDDATA;
362  }
363 
364  D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame);
365 
366  *got_frame_ptr = 1;
367 
368  return packet_size;
369 }
370 
371 static int amr_wb_decode_close(AVCodecContext *avctx)
372 {
373  AMRWBContext *s = avctx->priv_data;
374 
375  D_IF_exit(s->state);
376  return 0;
377 }
378 
379 AVCodec ff_libopencore_amrwb_decoder = {
380  .name = "libopencore_amrwb",
381  .type = AVMEDIA_TYPE_AUDIO,
382  .id = AV_CODEC_ID_AMR_WB,
383  .priv_data_size = sizeof(AMRWBContext),
384  .init = amr_wb_decode_init,
385  .close = amr_wb_decode_close,
386  .decode = amr_wb_decode_frame,
387  .capabilities = CODEC_CAP_DR1,
388  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
389 };
390 
391 #endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */