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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  ff_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  ff_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->initial_padding = 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  return -1;
209  }
210 
211  s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
212  s->enc_bitrate = avctx->bit_rate;
213 
214  return 0;
215 }
216 
217 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
218 {
219  AMRContext *s = avctx->priv_data;
220 
221  Encoder_Interface_exit(s->enc_state);
222  ff_af_queue_close(&s->afq);
223  return 0;
224 }
225 
226 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
227  const AVFrame *frame, int *got_packet_ptr)
228 {
229  AMRContext *s = avctx->priv_data;
230  int written, ret;
231  int16_t *flush_buf = NULL;
232  const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
233 
234  if (s->enc_bitrate != avctx->bit_rate) {
235  s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
236  s->enc_bitrate = avctx->bit_rate;
237  }
238 
239  if ((ret = ff_alloc_packet2(avctx, avpkt, 32)) < 0)
240  return ret;
241 
242  if (frame) {
243  if (frame->nb_samples < avctx->frame_size) {
244  flush_buf = av_mallocz_array(avctx->frame_size, sizeof(*flush_buf));
245  if (!flush_buf)
246  return AVERROR(ENOMEM);
247  memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
248  samples = flush_buf;
249  if (frame->nb_samples < avctx->frame_size - avctx->initial_padding)
250  s->enc_last_frame = -1;
251  }
252  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
253  av_freep(&flush_buf);
254  return ret;
255  }
256  } else {
257  if (s->enc_last_frame < 0)
258  return 0;
259  flush_buf = av_mallocz_array(avctx->frame_size, sizeof(*flush_buf));
260  if (!flush_buf)
261  return AVERROR(ENOMEM);
262  samples = flush_buf;
263  s->enc_last_frame = -1;
264  }
265 
266  written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
267  avpkt->data, 0);
268  ff_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
269  written, s->enc_mode, avpkt->data[0]);
270 
271  /* Get the next frame pts/duration */
272  ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
273  &avpkt->duration);
274 
275  avpkt->size = written;
276  *got_packet_ptr = 1;
277  av_freep(&flush_buf);
278  return 0;
279 }
280 
281 AVCodec ff_libopencore_amrnb_encoder = {
282  .name = "libopencore_amrnb",
283  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
284  .type = AVMEDIA_TYPE_AUDIO,
285  .id = AV_CODEC_ID_AMR_NB,
286  .priv_data_size = sizeof(AMRContext),
287  .init = amr_nb_encode_init,
288  .encode2 = amr_nb_encode_frame,
289  .close = amr_nb_encode_close,
291  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
293  .priv_class = &amrnb_class,
294 };
295 #endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */
296 
297 #endif /* CONFIG_LIBOPENCORE_AMRNB */
298 
299 /* -----------AMR wideband ------------*/
300 #if CONFIG_LIBOPENCORE_AMRWB_DECODER
301 
302 #include <opencore-amrwb/dec_if.h>
303 #include <opencore-amrwb/if_rom.h>
304 
305 typedef struct AMRWBContext {
306  void *state;
307 } AMRWBContext;
308 
309 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
310 {
311  AMRWBContext *s = avctx->priv_data;
312  int ret;
313 
314  if ((ret = amr_decode_fix_avctx(avctx)) < 0)
315  return ret;
316 
317  s->state = D_IF_init();
318 
319  return 0;
320 }
321 
322 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
323  int *got_frame_ptr, AVPacket *avpkt)
324 {
325  AVFrame *frame = data;
326  const uint8_t *buf = avpkt->data;
327  int buf_size = avpkt->size;
328  AMRWBContext *s = avctx->priv_data;
329  int mode, ret;
330  int packet_size;
331  static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
332 
333  /* get output buffer */
334  frame->nb_samples = 320;
335  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
336  return ret;
337 
338  mode = (buf[0] >> 3) & 0x000F;
339  packet_size = block_size[mode];
340 
341  if (packet_size > buf_size) {
342  av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
343  buf_size, packet_size + 1);
344  return AVERROR_INVALIDDATA;
345  }
346  if (!packet_size) {
347  av_log(avctx, AV_LOG_ERROR, "amr packet_size invalid\n");
348  return AVERROR_INVALIDDATA;
349  }
350 
351  D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame);
352 
353  *got_frame_ptr = 1;
354 
355  return packet_size;
356 }
357 
358 static int amr_wb_decode_close(AVCodecContext *avctx)
359 {
360  AMRWBContext *s = avctx->priv_data;
361 
362  D_IF_exit(s->state);
363  return 0;
364 }
365 
366 AVCodec ff_libopencore_amrwb_decoder = {
367  .name = "libopencore_amrwb",
368  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
369  .type = AVMEDIA_TYPE_AUDIO,
370  .id = AV_CODEC_ID_AMR_WB,
371  .priv_data_size = sizeof(AMRWBContext),
372  .init = amr_wb_decode_init,
373  .close = amr_wb_decode_close,
374  .decode = amr_wb_decode_frame,
375  .capabilities = CODEC_CAP_DR1,
376 };
377 
378 #endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */