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 <inttypes.h>
23
24 #include "libavutil/avstring.h"
25 #include "libavutil/channel_layout.h"
26 #include "libavutil/common.h"
27 #include "libavutil/opt.h"
28 #include "avcodec.h"
29 #include "audio_frame_queue.h"
30 #include "internal.h"
31
32 #if CONFIG_LIBOPENCORE_AMRNB_DECODER || CONFIG_LIBOPENCORE_AMRWB_DECODER
amr_decode_fix_avctx(AVCodecContext * avctx)33 static int amr_decode_fix_avctx(AVCodecContext *avctx)
34 {
35 const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB);
36
37 if (!avctx->sample_rate)
38 avctx->sample_rate = 8000 * is_amr_wb;
39
40 if (avctx->channels > 1) {
41 avpriv_report_missing_feature(avctx, "multi-channel AMR");
42 return AVERROR_PATCHWELCOME;
43 }
44
45 avctx->channels = 1;
46 avctx->channel_layout = AV_CH_LAYOUT_MONO;
47 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
48 return 0;
49 }
50 #endif
51
52 #if CONFIG_LIBOPENCORE_AMRNB
53
54 #include <opencore-amrnb/interf_dec.h>
55 #include <opencore-amrnb/interf_enc.h>
56
57 typedef struct AMRContext {
58 AVClass *av_class;
59 void *dec_state;
60 void *enc_state;
61 int enc_bitrate;
62 int enc_mode;
63 int enc_dtx;
64 int enc_last_frame;
65 AudioFrameQueue afq;
66 } AMRContext;
67
68 #if CONFIG_LIBOPENCORE_AMRNB_DECODER
amr_nb_decode_init(AVCodecContext * avctx)69 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
70 {
71 AMRContext *s = avctx->priv_data;
72 int ret;
73
74 if ((ret = amr_decode_fix_avctx(avctx)) < 0)
75 return ret;
76
77 s->dec_state = Decoder_Interface_init();
78 if (!s->dec_state) {
79 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
80 return -1;
81 }
82
83 return 0;
84 }
85
amr_nb_decode_close(AVCodecContext * avctx)86 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
87 {
88 AMRContext *s = avctx->priv_data;
89
90 Decoder_Interface_exit(s->dec_state);
91
92 return 0;
93 }
94
amr_nb_decode_frame(AVCodecContext * avctx,void * data,int * got_frame_ptr,AVPacket * avpkt)95 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
96 int *got_frame_ptr, AVPacket *avpkt)
97 {
98 AVFrame *frame = data;
99 const uint8_t *buf = avpkt->data;
100 int buf_size = avpkt->size;
101 AMRContext *s = avctx->priv_data;
102 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
103 enum Mode dec_mode;
104 int packet_size, ret;
105
106 ff_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
107 buf, buf_size, avctx->frame_number);
108
109 /* get output buffer */
110 frame->nb_samples = 160;
111 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
112 return ret;
113
114 dec_mode = (buf[0] >> 3) & 0x000F;
115 packet_size = block_size[dec_mode] + 1;
116
117 if (packet_size > buf_size) {
118 av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
119 buf_size, packet_size);
120 return AVERROR_INVALIDDATA;
121 }
122
123 ff_dlog(avctx, "packet_size=%d buf= 0x%"PRIx8" %"PRIx8" %"PRIx8" %"PRIx8"\n",
124 packet_size, buf[0], buf[1], buf[2], buf[3]);
125 /* call decoder */
126 Decoder_Interface_Decode(s->dec_state, buf, (short *)frame->data[0], 0);
127
128 *got_frame_ptr = 1;
129
130 return packet_size;
131 }
132
133 AVCodec ff_libopencore_amrnb_decoder = {
134 .name = "libopencore_amrnb",
135 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
136 .type = AVMEDIA_TYPE_AUDIO,
137 .id = AV_CODEC_ID_AMR_NB,
138 .priv_data_size = sizeof(AMRContext),
139 .init = amr_nb_decode_init,
140 .close = amr_nb_decode_close,
141 .decode = amr_nb_decode_frame,
142 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
143 };
144 #endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */
145
146 #if CONFIG_LIBOPENCORE_AMRNB_ENCODER
147 /* Common code for fixed and float version*/
148 typedef struct AMR_bitrates {
149 int rate;
150 enum Mode mode;
151 } AMR_bitrates;
152
153 /* Match desired bitrate */
get_bitrate_mode(int bitrate,void * log_ctx)154 static int get_bitrate_mode(int bitrate, void *log_ctx)
155 {
156 /* make the correspondence between bitrate and mode */
157 static const AMR_bitrates rates[] = {
158 { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
159 { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
160 };
161 int i, best = -1, min_diff = 0;
162 char log_buf[200];
163
164 for (i = 0; i < 8; i++) {
165 if (rates[i].rate == bitrate)
166 return rates[i].mode;
167 if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
168 best = i;
169 min_diff = abs(rates[i].rate - bitrate);
170 }
171 }
172 /* no bitrate matching exactly, log a warning */
173 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
174 for (i = 0; i < 8; i++)
175 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
176 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
177 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
178
179 return best;
180 }
181
182 static const AVOption options[] = {
183 { "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 },
184 { NULL }
185 };
186
187 static const AVClass amrnb_class = {
188 .class_name = "libopencore_amrnb",
189 .item_name = av_default_item_name,
190 .option = options,
191 .version = LIBAVUTIL_VERSION_INT,
192 };
193
amr_nb_encode_init(AVCodecContext * avctx)194 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
195 {
196 AMRContext *s = avctx->priv_data;
197
198 if (avctx->sample_rate != 8000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
199 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
200 return AVERROR(ENOSYS);
201 }
202
203 if (avctx->channels != 1) {
204 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
205 return AVERROR(ENOSYS);
206 }
207
208 avctx->frame_size = 160;
209 avctx->initial_padding = 50;
210 ff_af_queue_init(avctx, &s->afq);
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 return -1;
216 }
217
218 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
219 s->enc_bitrate = avctx->bit_rate;
220
221 return 0;
222 }
223
amr_nb_encode_close(AVCodecContext * avctx)224 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
225 {
226 AMRContext *s = avctx->priv_data;
227
228 Encoder_Interface_exit(s->enc_state);
229 ff_af_queue_close(&s->afq);
230 return 0;
231 }
232
amr_nb_encode_frame(AVCodecContext * avctx,AVPacket * avpkt,const AVFrame * frame,int * got_packet_ptr)233 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
234 const AVFrame *frame, int *got_packet_ptr)
235 {
236 AMRContext *s = avctx->priv_data;
237 int written, ret;
238 int16_t *flush_buf = NULL;
239 const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
240
241 if (s->enc_bitrate != avctx->bit_rate) {
242 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
243 s->enc_bitrate = avctx->bit_rate;
244 }
245
246 if ((ret = ff_alloc_packet2(avctx, avpkt, 32, 0)) < 0)
247 return ret;
248
249 if (frame) {
250 if (frame->nb_samples < avctx->frame_size) {
251 flush_buf = av_mallocz_array(avctx->frame_size, sizeof(*flush_buf));
252 if (!flush_buf)
253 return AVERROR(ENOMEM);
254 memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
255 samples = flush_buf;
256 if (frame->nb_samples < avctx->frame_size - avctx->initial_padding)
257 s->enc_last_frame = -1;
258 }
259 if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
260 av_freep(&flush_buf);
261 return ret;
262 }
263 } else {
264 if (s->enc_last_frame < 0)
265 return 0;
266 flush_buf = av_mallocz_array(avctx->frame_size, sizeof(*flush_buf));
267 if (!flush_buf)
268 return AVERROR(ENOMEM);
269 samples = flush_buf;
270 s->enc_last_frame = -1;
271 }
272
273 written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
274 avpkt->data, 0);
275 ff_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
276 written, s->enc_mode, avpkt->data[0]);
277
278 /* Get the next frame pts/duration */
279 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
280 &avpkt->duration);
281
282 avpkt->size = written;
283 *got_packet_ptr = 1;
284 av_freep(&flush_buf);
285 return 0;
286 }
287
288 AVCodec ff_libopencore_amrnb_encoder = {
289 .name = "libopencore_amrnb",
290 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
291 .type = AVMEDIA_TYPE_AUDIO,
292 .id = AV_CODEC_ID_AMR_NB,
293 .priv_data_size = sizeof(AMRContext),
294 .init = amr_nb_encode_init,
295 .encode2 = amr_nb_encode_frame,
296 .close = amr_nb_encode_close,
297 .capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SMALL_LAST_FRAME,
298 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
299 AV_SAMPLE_FMT_NONE },
300 .priv_class = &amrnb_class,
301 };
302 #endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */
303
304 #endif /* CONFIG_LIBOPENCORE_AMRNB */
305
306 /* -----------AMR wideband ------------*/
307 #if CONFIG_LIBOPENCORE_AMRWB_DECODER
308
309 #include <opencore-amrwb/dec_if.h>
310 #include <opencore-amrwb/if_rom.h>
311
312 typedef struct AMRWBContext {
313 void *state;
314 } AMRWBContext;
315
amr_wb_decode_init(AVCodecContext * avctx)316 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
317 {
318 AMRWBContext *s = avctx->priv_data;
319 int ret;
320
321 if ((ret = amr_decode_fix_avctx(avctx)) < 0)
322 return ret;
323
324 s->state = D_IF_init();
325
326 return 0;
327 }
328
amr_wb_decode_frame(AVCodecContext * avctx,void * data,int * got_frame_ptr,AVPacket * avpkt)329 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
330 int *got_frame_ptr, AVPacket *avpkt)
331 {
332 AVFrame *frame = data;
333 const uint8_t *buf = avpkt->data;
334 int buf_size = avpkt->size;
335 AMRWBContext *s = avctx->priv_data;
336 int mode, ret;
337 int packet_size;
338 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
339
340 /* get output buffer */
341 frame->nb_samples = 320;
342 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
343 return ret;
344
345 mode = (buf[0] >> 3) & 0x000F;
346 packet_size = block_size[mode];
347
348 if (packet_size > buf_size) {
349 av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
350 buf_size, packet_size + 1);
351 return AVERROR_INVALIDDATA;
352 }
353 if (!packet_size) {
354 av_log(avctx, AV_LOG_ERROR, "amr packet_size invalid\n");
355 return AVERROR_INVALIDDATA;
356 }
357
358 D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame);
359
360 *got_frame_ptr = 1;
361
362 return packet_size;
363 }
364
amr_wb_decode_close(AVCodecContext * avctx)365 static int amr_wb_decode_close(AVCodecContext *avctx)
366 {
367 AMRWBContext *s = avctx->priv_data;
368
369 D_IF_exit(s->state);
370 return 0;
371 }
372
373 AVCodec ff_libopencore_amrwb_decoder = {
374 .name = "libopencore_amrwb",
375 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
376 .type = AVMEDIA_TYPE_AUDIO,
377 .id = AV_CODEC_ID_AMR_WB,
378 .priv_data_size = sizeof(AMRWBContext),
379 .init = amr_wb_decode_init,
380 .close = amr_wb_decode_close,
381 .decode = amr_wb_decode_frame,
382 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
383 .wrapper_name = "libopencore_amrwb",
384 };
385
386 #endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */
387