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 "config_components.h"
23
24 #include <inttypes.h>
25
26 #include "libavutil/avstring.h"
27 #include "libavutil/channel_layout.h"
28 #include "libavutil/common.h"
29 #include "libavutil/opt.h"
30 #include "avcodec.h"
31 #include "audio_frame_queue.h"
32 #include "codec_internal.h"
33 #include "encode.h"
34 #include "internal.h"
35
36 #if CONFIG_LIBOPENCORE_AMRNB_DECODER || CONFIG_LIBOPENCORE_AMRWB_DECODER
amr_decode_fix_avctx(AVCodecContext * avctx)37 static int amr_decode_fix_avctx(AVCodecContext *avctx)
38 {
39 const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB);
40
41 if (!avctx->sample_rate)
42 avctx->sample_rate = 8000 * is_amr_wb;
43
44 if (avctx->ch_layout.nb_channels > 1) {
45 avpriv_report_missing_feature(avctx, "multi-channel AMR");
46 return AVERROR_PATCHWELCOME;
47 }
48
49 av_channel_layout_uninit(&avctx->ch_layout);
50 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
51 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
52 return 0;
53 }
54 #endif
55
56 #if CONFIG_LIBOPENCORE_AMRNB
57
58 #include <opencore-amrnb/interf_dec.h>
59 #include <opencore-amrnb/interf_enc.h>
60
61 typedef struct AMRContext {
62 AVClass *av_class;
63 void *dec_state;
64 void *enc_state;
65 int enc_bitrate;
66 int enc_mode;
67 int enc_dtx;
68 int enc_last_frame;
69 AudioFrameQueue afq;
70 } AMRContext;
71
72 #if CONFIG_LIBOPENCORE_AMRNB_DECODER
amr_nb_decode_init(AVCodecContext * avctx)73 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
74 {
75 AMRContext *s = avctx->priv_data;
76 int ret;
77
78 if ((ret = amr_decode_fix_avctx(avctx)) < 0)
79 return ret;
80
81 s->dec_state = Decoder_Interface_init();
82 if (!s->dec_state) {
83 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
84 return -1;
85 }
86
87 return 0;
88 }
89
amr_nb_decode_close(AVCodecContext * avctx)90 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
91 {
92 AMRContext *s = avctx->priv_data;
93
94 Decoder_Interface_exit(s->dec_state);
95
96 return 0;
97 }
98
amr_nb_decode_frame(AVCodecContext * avctx,AVFrame * frame,int * got_frame_ptr,AVPacket * avpkt)99 static int amr_nb_decode_frame(AVCodecContext *avctx, AVFrame *frame,
100 int *got_frame_ptr, AVPacket *avpkt)
101 {
102 const uint8_t *buf = avpkt->data;
103 int buf_size = avpkt->size;
104 AMRContext *s = avctx->priv_data;
105 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
106 enum Mode dec_mode;
107 int packet_size, ret;
108
109 ff_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
110 buf, buf_size, avctx->frame_number);
111
112 /* get output buffer */
113 frame->nb_samples = 160;
114 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
115 return ret;
116
117 dec_mode = (buf[0] >> 3) & 0x000F;
118 packet_size = block_size[dec_mode] + 1;
119
120 if (packet_size > buf_size) {
121 av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
122 buf_size, packet_size);
123 return AVERROR_INVALIDDATA;
124 }
125
126 ff_dlog(avctx, "packet_size=%d buf= 0x%"PRIx8" %"PRIx8" %"PRIx8" %"PRIx8"\n",
127 packet_size, buf[0], buf[1], buf[2], buf[3]);
128 /* call decoder */
129 Decoder_Interface_Decode(s->dec_state, buf, (short *)frame->data[0], 0);
130
131 *got_frame_ptr = 1;
132
133 return packet_size;
134 }
135
136 const FFCodec ff_libopencore_amrnb_decoder = {
137 .p.name = "libopencore_amrnb",
138 .p.long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
139 .p.type = AVMEDIA_TYPE_AUDIO,
140 .p.id = AV_CODEC_ID_AMR_NB,
141 .priv_data_size = sizeof(AMRContext),
142 .init = amr_nb_decode_init,
143 .close = amr_nb_decode_close,
144 FF_CODEC_DECODE_CB(amr_nb_decode_frame),
145 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
146 };
147 #endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */
148
149 #if CONFIG_LIBOPENCORE_AMRNB_ENCODER
150 /* Common code for fixed and float version*/
151 typedef struct AMR_bitrates {
152 int rate;
153 enum Mode mode;
154 } AMR_bitrates;
155
156 /* Match desired bitrate */
get_bitrate_mode(int bitrate,void * log_ctx)157 static int get_bitrate_mode(int bitrate, void *log_ctx)
158 {
159 /* make the correspondence between bitrate and mode */
160 static const AMR_bitrates rates[] = {
161 { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
162 { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
163 };
164 int i, best = -1, min_diff = 0;
165 char log_buf[200];
166
167 for (i = 0; i < 8; i++) {
168 if (rates[i].rate == bitrate)
169 return rates[i].mode;
170 if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
171 best = i;
172 min_diff = abs(rates[i].rate - bitrate);
173 }
174 }
175 /* no bitrate matching exactly, log a warning */
176 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
177 for (i = 0; i < 8; i++)
178 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
179 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
180 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
181
182 return best;
183 }
184
185 static const AVOption options[] = {
186 { "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 },
187 { NULL }
188 };
189
190 static const AVClass amrnb_class = {
191 .class_name = "libopencore_amrnb",
192 .item_name = av_default_item_name,
193 .option = options,
194 .version = LIBAVUTIL_VERSION_INT,
195 };
196
amr_nb_encode_init(AVCodecContext * avctx)197 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
198 {
199 AMRContext *s = avctx->priv_data;
200
201 if (avctx->sample_rate != 8000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
202 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
203 return AVERROR(ENOSYS);
204 }
205
206 if (avctx->ch_layout.nb_channels != 1) {
207 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
208 return AVERROR(ENOSYS);
209 }
210
211 avctx->frame_size = 160;
212 avctx->initial_padding = 50;
213 ff_af_queue_init(avctx, &s->afq);
214
215 s->enc_state = Encoder_Interface_init(s->enc_dtx);
216 if (!s->enc_state) {
217 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
218 return -1;
219 }
220
221 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
222 s->enc_bitrate = avctx->bit_rate;
223
224 return 0;
225 }
226
amr_nb_encode_close(AVCodecContext * avctx)227 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
228 {
229 AMRContext *s = avctx->priv_data;
230
231 Encoder_Interface_exit(s->enc_state);
232 ff_af_queue_close(&s->afq);
233 return 0;
234 }
235
amr_nb_encode_frame(AVCodecContext * avctx,AVPacket * avpkt,const AVFrame * frame,int * got_packet_ptr)236 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
237 const AVFrame *frame, int *got_packet_ptr)
238 {
239 AMRContext *s = avctx->priv_data;
240 int written, ret;
241 int16_t *flush_buf = NULL;
242 const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
243
244 if (s->enc_bitrate != avctx->bit_rate) {
245 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
246 s->enc_bitrate = avctx->bit_rate;
247 }
248
249 if ((ret = ff_alloc_packet(avctx, avpkt, 32)) < 0)
250 return ret;
251
252 if (frame) {
253 if (frame->nb_samples < avctx->frame_size) {
254 flush_buf = av_calloc(avctx->frame_size, sizeof(*flush_buf));
255 if (!flush_buf)
256 return AVERROR(ENOMEM);
257 memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
258 samples = flush_buf;
259 if (frame->nb_samples < avctx->frame_size - avctx->initial_padding)
260 s->enc_last_frame = -1;
261 }
262 if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
263 av_freep(&flush_buf);
264 return ret;
265 }
266 } else {
267 if (s->enc_last_frame < 0)
268 return 0;
269 flush_buf = av_calloc(avctx->frame_size, sizeof(*flush_buf));
270 if (!flush_buf)
271 return AVERROR(ENOMEM);
272 samples = flush_buf;
273 s->enc_last_frame = -1;
274 }
275
276 written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
277 avpkt->data, 0);
278 ff_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
279 written, s->enc_mode, avpkt->data[0]);
280
281 /* Get the next frame pts/duration */
282 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
283 &avpkt->duration);
284
285 avpkt->size = written;
286 *got_packet_ptr = 1;
287 av_freep(&flush_buf);
288 return 0;
289 }
290
291 const FFCodec ff_libopencore_amrnb_encoder = {
292 .p.name = "libopencore_amrnb",
293 .p.long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
294 .p.type = AVMEDIA_TYPE_AUDIO,
295 .p.id = AV_CODEC_ID_AMR_NB,
296 .priv_data_size = sizeof(AMRContext),
297 .init = amr_nb_encode_init,
298 FF_CODEC_ENCODE_CB(amr_nb_encode_frame),
299 .close = amr_nb_encode_close,
300 .p.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SMALL_LAST_FRAME,
301 .p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
302 AV_SAMPLE_FMT_NONE },
303 .p.priv_class = &amrnb_class,
304 };
305 #endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */
306
307 #endif /* CONFIG_LIBOPENCORE_AMRNB */
308
309 /* -----------AMR wideband ------------*/
310 #if CONFIG_LIBOPENCORE_AMRWB_DECODER
311
312 #include <opencore-amrwb/dec_if.h>
313 #include <opencore-amrwb/if_rom.h>
314
315 typedef struct AMRWBContext {
316 void *state;
317 } AMRWBContext;
318
amr_wb_decode_init(AVCodecContext * avctx)319 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
320 {
321 AMRWBContext *s = avctx->priv_data;
322 int ret;
323
324 if ((ret = amr_decode_fix_avctx(avctx)) < 0)
325 return ret;
326
327 s->state = D_IF_init();
328
329 return 0;
330 }
331
amr_wb_decode_frame(AVCodecContext * avctx,AVFrame * frame,int * got_frame_ptr,AVPacket * avpkt)332 static int amr_wb_decode_frame(AVCodecContext *avctx, AVFrame *frame,
333 int *got_frame_ptr, AVPacket *avpkt)
334 {
335 const uint8_t *buf = avpkt->data;
336 int buf_size = avpkt->size;
337 AMRWBContext *s = avctx->priv_data;
338 int mode, ret;
339 int packet_size;
340 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
341
342 /* get output buffer */
343 frame->nb_samples = 320;
344 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
345 return ret;
346
347 mode = (buf[0] >> 3) & 0x000F;
348 packet_size = block_size[mode];
349
350 if (packet_size > buf_size) {
351 av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
352 buf_size, packet_size + 1);
353 return AVERROR_INVALIDDATA;
354 }
355 if (!packet_size) {
356 av_log(avctx, AV_LOG_ERROR, "amr packet_size invalid\n");
357 return AVERROR_INVALIDDATA;
358 }
359
360 D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame);
361
362 *got_frame_ptr = 1;
363
364 return packet_size;
365 }
366
amr_wb_decode_close(AVCodecContext * avctx)367 static int amr_wb_decode_close(AVCodecContext *avctx)
368 {
369 AMRWBContext *s = avctx->priv_data;
370
371 D_IF_exit(s->state);
372 return 0;
373 }
374
375 const FFCodec ff_libopencore_amrwb_decoder = {
376 .p.name = "libopencore_amrwb",
377 .p.long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
378 .p.type = AVMEDIA_TYPE_AUDIO,
379 .p.id = AV_CODEC_ID_AMR_WB,
380 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
381 .p.wrapper_name = "libopencore_amrwb",
382 .priv_data_size = sizeof(AMRWBContext),
383 .init = amr_wb_decode_init,
384 .close = amr_wb_decode_close,
385 FF_CODEC_DECODE_CB(amr_wb_decode_frame),
386 };
387
388 #endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */
389