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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  avpriv_report_missing_feature(avctx, "multi-channel AMR");
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)) < 0)
108  return ret;
109 
110  dec_mode = (buf[0] >> 3) & 0x000F;
111  packet_size = block_size[dec_mode] + 1;
112 
113  if (packet_size > buf_size) {
114  av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
115  buf_size, packet_size);
116  return AVERROR_INVALIDDATA;
117  }
118 
119  av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
120  packet_size, buf[0], buf[1], buf[2], buf[3]);
121  /* call decoder */
122  Decoder_Interface_Decode(s->dec_state, buf, (short *)frame->data[0], 0);
123 
124  *got_frame_ptr = 1;
125 
126  return packet_size;
127 }
128 
129 AVCodec ff_libopencore_amrnb_decoder = {
130  .name = "libopencore_amrnb",
131  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
132  .type = AVMEDIA_TYPE_AUDIO,
133  .id = AV_CODEC_ID_AMR_NB,
134  .priv_data_size = sizeof(AMRContext),
135  .init = amr_nb_decode_init,
136  .close = amr_nb_decode_close,
137  .decode = amr_nb_decode_frame,
138  .capabilities = CODEC_CAP_DR1,
139 };
140 #endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */
141 
142 #if CONFIG_LIBOPENCORE_AMRNB_ENCODER
143 /* Common code for fixed and float version*/
144 typedef struct AMR_bitrates {
145  int rate;
146  enum Mode mode;
147 } AMR_bitrates;
148 
149 /* Match desired bitrate */
150 static int get_bitrate_mode(int bitrate, void *log_ctx)
151 {
152  /* make the correspondance between bitrate and mode */
153  static const AMR_bitrates rates[] = {
154  { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
155  { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
156  };
157  int i, best = -1, min_diff = 0;
158  char log_buf[200];
159 
160  for (i = 0; i < 8; i++) {
161  if (rates[i].rate == bitrate)
162  return rates[i].mode;
163  if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
164  best = i;
165  min_diff = abs(rates[i].rate - bitrate);
166  }
167  }
168  /* no bitrate matching exactly, log a warning */
169  snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
170  for (i = 0; i < 8; i++)
171  av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
172  av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
173  av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
174 
175  return best;
176 }
177 
178 static const AVOption options[] = {
179  { "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 },
180  { NULL }
181 };
182 
183 static const AVClass amrnb_class = {
184  "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
185 };
186 
187 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
188 {
189  AMRContext *s = avctx->priv_data;
190 
191  if (avctx->sample_rate != 8000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
192  av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
193  return AVERROR(ENOSYS);
194  }
195 
196  if (avctx->channels != 1) {
197  av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
198  return AVERROR(ENOSYS);
199  }
200 
201  avctx->frame_size = 160;
202  avctx->delay = 50;
203  ff_af_queue_init(avctx, &s->afq);
204 
205  s->enc_state = Encoder_Interface_init(s->enc_dtx);
206  if (!s->enc_state) {
207  av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
208  av_freep(&avctx->coded_frame);
209  return -1;
210  }
211 
212  s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
213  s->enc_bitrate = avctx->bit_rate;
214 
215  return 0;
216 }
217 
218 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
219 {
220  AMRContext *s = avctx->priv_data;
221 
222  Encoder_Interface_exit(s->enc_state);
223  ff_af_queue_close(&s->afq);
224  return 0;
225 }
226 
227 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
228  const AVFrame *frame, int *got_packet_ptr)
229 {
230  AMRContext *s = avctx->priv_data;
231  int written, ret;
232  int16_t *flush_buf = NULL;
233  const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
234 
235  if (s->enc_bitrate != avctx->bit_rate) {
236  s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
237  s->enc_bitrate = avctx->bit_rate;
238  }
239 
240  if ((ret = ff_alloc_packet2(avctx, avpkt, 32)) < 0)
241  return ret;
242 
243  if (frame) {
244  if (frame->nb_samples < avctx->frame_size) {
245  flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
246  if (!flush_buf)
247  return AVERROR(ENOMEM);
248  memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
249  samples = flush_buf;
250  if (frame->nb_samples < avctx->frame_size - avctx->delay)
251  s->enc_last_frame = -1;
252  }
253  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
254  av_freep(&flush_buf);
255  return ret;
256  }
257  } else {
258  if (s->enc_last_frame < 0)
259  return 0;
260  flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
261  if (!flush_buf)
262  return AVERROR(ENOMEM);
263  samples = flush_buf;
264  s->enc_last_frame = -1;
265  }
266 
267  written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
268  avpkt->data, 0);
269  av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
270  written, s->enc_mode, avpkt->data[0]);
271 
272  /* Get the next frame pts/duration */
273  ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
274  &avpkt->duration);
275 
276  avpkt->size = written;
277  *got_packet_ptr = 1;
278  av_freep(&flush_buf);
279  return 0;
280 }
281 
282 AVCodec ff_libopencore_amrnb_encoder = {
283  .name = "libopencore_amrnb",
284  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
285  .type = AVMEDIA_TYPE_AUDIO,
286  .id = AV_CODEC_ID_AMR_NB,
287  .priv_data_size = sizeof(AMRContext),
288  .init = amr_nb_encode_init,
289  .encode2 = amr_nb_encode_frame,
290  .close = amr_nb_encode_close,
292  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
294  .priv_class = &amrnb_class,
295 };
296 #endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */
297 
298 #endif /* CONFIG_LIBOPENCORE_AMRNB */
299 
300 /* -----------AMR wideband ------------*/
301 #if CONFIG_LIBOPENCORE_AMRWB_DECODER
302 
303 #include <opencore-amrwb/dec_if.h>
304 #include <opencore-amrwb/if_rom.h>
305 
306 typedef struct AMRWBContext {
307  void *state;
308 } AMRWBContext;
309 
310 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
311 {
312  AMRWBContext *s = avctx->priv_data;
313  int ret;
314 
315  if ((ret = amr_decode_fix_avctx(avctx)) < 0)
316  return ret;
317 
318  s->state = D_IF_init();
319 
320  return 0;
321 }
322 
323 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
324  int *got_frame_ptr, AVPacket *avpkt)
325 {
326  AVFrame *frame = data;
327  const uint8_t *buf = avpkt->data;
328  int buf_size = avpkt->size;
329  AMRWBContext *s = avctx->priv_data;
330  int mode, ret;
331  int packet_size;
332  static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
333 
334  /* get output buffer */
335  frame->nb_samples = 320;
336  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
337  return ret;
338 
339  mode = (buf[0] >> 3) & 0x000F;
340  packet_size = block_size[mode];
341 
342  if (packet_size > buf_size) {
343  av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
344  buf_size, packet_size + 1);
345  return AVERROR_INVALIDDATA;
346  }
347  if (!packet_size) {
348  av_log(avctx, AV_LOG_ERROR, "amr packet_size invalid\n");
349  return AVERROR_INVALIDDATA;
350  }
351 
352  D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame);
353 
354  *got_frame_ptr = 1;
355 
356  return packet_size;
357 }
358 
359 static int amr_wb_decode_close(AVCodecContext *avctx)
360 {
361  AMRWBContext *s = avctx->priv_data;
362 
363  D_IF_exit(s->state);
364  return 0;
365 }
366 
367 AVCodec ff_libopencore_amrwb_decoder = {
368  .name = "libopencore_amrwb",
369  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
370  .type = AVMEDIA_TYPE_AUDIO,
371  .id = AV_CODEC_ID_AMR_WB,
372  .priv_data_size = sizeof(AMRWBContext),
373  .init = amr_wb_decode_init,
374  .close = amr_wb_decode_close,
375  .decode = amr_wb_decode_frame,
376  .capabilities = CODEC_CAP_DR1,
377 };
378 
379 #endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */