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path: root/libavcodec/libopencore-amr.c (plain)
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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 <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
32static int amr_decode_fix_avctx(AVCodecContext *avctx)
33{
34 const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB);
35
36 if (!avctx->sample_rate)
37 avctx->sample_rate = 8000 * is_amr_wb;
38
39 if (avctx->channels > 1) {
40 avpriv_report_missing_feature(avctx, "multi-channel AMR");
41 return AVERROR_PATCHWELCOME;
42 }
43
44 avctx->channels = 1;
45 avctx->channel_layout = AV_CH_LAYOUT_MONO;
46 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
47 return 0;
48}
49
50#if CONFIG_LIBOPENCORE_AMRNB
51
52#include <opencore-amrnb/interf_dec.h>
53#include <opencore-amrnb/interf_enc.h>
54
55typedef struct AMRContext {
56 AVClass *av_class;
57 void *dec_state;
58 void *enc_state;
59 int enc_bitrate;
60 int enc_mode;
61 int enc_dtx;
62 int enc_last_frame;
63 AudioFrameQueue afq;
64} AMRContext;
65
66#if CONFIG_LIBOPENCORE_AMRNB_DECODER
67static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
68{
69 AMRContext *s = avctx->priv_data;
70 int ret;
71
72 if ((ret = amr_decode_fix_avctx(avctx)) < 0)
73 return ret;
74
75 s->dec_state = Decoder_Interface_init();
76 if (!s->dec_state) {
77 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
78 return -1;
79 }
80
81 return 0;
82}
83
84static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
85{
86 AMRContext *s = avctx->priv_data;
87
88 Decoder_Interface_exit(s->dec_state);
89
90 return 0;
91}
92
93static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
94 int *got_frame_ptr, AVPacket *avpkt)
95{
96 AVFrame *frame = data;
97 const uint8_t *buf = avpkt->data;
98 int buf_size = avpkt->size;
99 AMRContext *s = avctx->priv_data;
100 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
101 enum Mode dec_mode;
102 int packet_size, ret;
103
104 ff_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
105 buf, buf_size, avctx->frame_number);
106
107 /* get output buffer */
108 frame->nb_samples = 160;
109 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
110 return ret;
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 (%d, should be %d)\n",
117 buf_size, packet_size);
118 return AVERROR_INVALIDDATA;
119 }
120
121 ff_dlog(avctx, "packet_size=%d buf= 0x%"PRIx8" %"PRIx8" %"PRIx8" %"PRIx8"\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
131AVCodec ff_libopencore_amrnb_decoder = {
132 .name = "libopencore_amrnb",
133 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
134 .type = AVMEDIA_TYPE_AUDIO,
135 .id = AV_CODEC_ID_AMR_NB,
136 .priv_data_size = sizeof(AMRContext),
137 .init = amr_nb_decode_init,
138 .close = amr_nb_decode_close,
139 .decode = amr_nb_decode_frame,
140 .capabilities = AV_CODEC_CAP_DR1,
141};
142#endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */
143
144#if CONFIG_LIBOPENCORE_AMRNB_ENCODER
145/* Common code for fixed and float version*/
146typedef struct AMR_bitrates {
147 int rate;
148 enum Mode mode;
149} AMR_bitrates;
150
151/* Match desired bitrate */
152static int get_bitrate_mode(int bitrate, void *log_ctx)
153{
154 /* make the correspondence 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
180static 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
185static const AVClass amrnb_class = {
186 "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
187};
188
189static 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->initial_padding = 50;
205 ff_af_queue_init(avctx, &s->afq);
206
207 s->enc_state = Encoder_Interface_init(s->enc_dtx);
208 if (!s->enc_state) {
209 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
210 return -1;
211 }
212
213 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
214 s->enc_bitrate = avctx->bit_rate;
215
216 return 0;
217}
218
219static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
220{
221 AMRContext *s = avctx->priv_data;
222
223 Encoder_Interface_exit(s->enc_state);
224 ff_af_queue_close(&s->afq);
225 return 0;
226}
227
228static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
229 const AVFrame *frame, int *got_packet_ptr)
230{
231 AMRContext *s = avctx->priv_data;
232 int written, ret;
233 int16_t *flush_buf = NULL;
234 const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
235
236 if (s->enc_bitrate != avctx->bit_rate) {
237 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
238 s->enc_bitrate = avctx->bit_rate;
239 }
240
241 if ((ret = ff_alloc_packet2(avctx, avpkt, 32, 0)) < 0)
242 return ret;
243
244 if (frame) {
245 if (frame->nb_samples < avctx->frame_size) {
246 flush_buf = av_mallocz_array(avctx->frame_size, sizeof(*flush_buf));
247 if (!flush_buf)
248 return AVERROR(ENOMEM);
249 memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
250 samples = flush_buf;
251 if (frame->nb_samples < avctx->frame_size - avctx->initial_padding)
252 s->enc_last_frame = -1;
253 }
254 if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
255 av_freep(&flush_buf);
256 return ret;
257 }
258 } else {
259 if (s->enc_last_frame < 0)
260 return 0;
261 flush_buf = av_mallocz_array(avctx->frame_size, sizeof(*flush_buf));
262 if (!flush_buf)
263 return AVERROR(ENOMEM);
264 samples = flush_buf;
265 s->enc_last_frame = -1;
266 }
267
268 written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
269 avpkt->data, 0);
270 ff_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
271 written, s->enc_mode, avpkt->data[0]);
272
273 /* Get the next frame pts/duration */
274 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
275 &avpkt->duration);
276
277 avpkt->size = written;
278 *got_packet_ptr = 1;
279 av_freep(&flush_buf);
280 return 0;
281}
282
283AVCodec ff_libopencore_amrnb_encoder = {
284 .name = "libopencore_amrnb",
285 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
286 .type = AVMEDIA_TYPE_AUDIO,
287 .id = AV_CODEC_ID_AMR_NB,
288 .priv_data_size = sizeof(AMRContext),
289 .init = amr_nb_encode_init,
290 .encode2 = amr_nb_encode_frame,
291 .close = amr_nb_encode_close,
292 .capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SMALL_LAST_FRAME,
293 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
294 AV_SAMPLE_FMT_NONE },
295 .priv_class = &amrnb_class,
296};
297#endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */
298
299#endif /* CONFIG_LIBOPENCORE_AMRNB */
300
301/* -----------AMR wideband ------------*/
302#if CONFIG_LIBOPENCORE_AMRWB_DECODER
303
304#include <opencore-amrwb/dec_if.h>
305#include <opencore-amrwb/if_rom.h>
306
307typedef struct AMRWBContext {
308 void *state;
309} AMRWBContext;
310
311static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
312{
313 AMRWBContext *s = avctx->priv_data;
314 int ret;
315
316 if ((ret = amr_decode_fix_avctx(avctx)) < 0)
317 return ret;
318
319 s->state = D_IF_init();
320
321 return 0;
322}
323
324static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
325 int *got_frame_ptr, AVPacket *avpkt)
326{
327 AVFrame *frame = data;
328 const uint8_t *buf = avpkt->data;
329 int buf_size = avpkt->size;
330 AMRWBContext *s = avctx->priv_data;
331 int mode, ret;
332 int packet_size;
333 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
334
335 /* get output buffer */
336 frame->nb_samples = 320;
337 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
338 return ret;
339
340 mode = (buf[0] >> 3) & 0x000F;
341 packet_size = block_size[mode];
342
343 if (packet_size > buf_size) {
344 av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
345 buf_size, packet_size + 1);
346 return AVERROR_INVALIDDATA;
347 }
348 if (!packet_size) {
349 av_log(avctx, AV_LOG_ERROR, "amr packet_size invalid\n");
350 return AVERROR_INVALIDDATA;
351 }
352
353 D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame);
354
355 *got_frame_ptr = 1;
356
357 return packet_size;
358}
359
360static int amr_wb_decode_close(AVCodecContext *avctx)
361{
362 AMRWBContext *s = avctx->priv_data;
363
364 D_IF_exit(s->state);
365 return 0;
366}
367
368AVCodec ff_libopencore_amrwb_decoder = {
369 .name = "libopencore_amrwb",
370 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
371 .type = AVMEDIA_TYPE_AUDIO,
372 .id = AV_CODEC_ID_AMR_WB,
373 .priv_data_size = sizeof(AMRWBContext),
374 .init = amr_wb_decode_init,
375 .close = amr_wb_decode_close,
376 .decode = amr_wb_decode_frame,
377 .capabilities = AV_CODEC_CAP_DR1,
378};
379
380#endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */
381
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