2 * AMR Audio decoder stub
3 * Copyright (c) 2003 the ffmpeg project
5 * This file is part of FFmpeg.
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.
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.
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
23 #include "libavutil/avstring.h"
24 #include "libavutil/opt.h"
25 #include "audio_frame_queue.h"
28 static void amr_decode_fix_avctx(AVCodecContext *avctx)
30 const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
32 if (!avctx->sample_rate)
33 avctx->sample_rate = 8000 * is_amr_wb;
38 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
41 #if CONFIG_LIBOPENCORE_AMRNB
43 #include <opencore-amrnb/interf_dec.h>
44 #include <opencore-amrnb/interf_enc.h>
46 /* Common code for fixed and float version*/
47 typedef struct AMR_bitrates {
52 /* Match desired bitrate */
53 static int get_bitrate_mode(int bitrate, void *log_ctx)
55 /* make the correspondance between bitrate and mode */
56 static const AMR_bitrates rates[] = {
57 { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
58 { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
60 int i, best = -1, min_diff = 0;
63 for (i = 0; i < 8; i++) {
64 if (rates[i].rate == bitrate)
66 if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
68 min_diff = abs(rates[i].rate - bitrate);
71 /* no bitrate matching exactly, log a warning */
72 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
73 for (i = 0; i < 8; i++)
74 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
75 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
76 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
81 typedef struct AMRContext {
93 static const AVOption options[] = {
94 { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRContext, enc_dtx), AV_OPT_TYPE_INT, { 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
98 static const AVClass class = {
99 "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
102 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
104 AMRContext *s = avctx->priv_data;
106 s->dec_state = Decoder_Interface_init();
108 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
112 amr_decode_fix_avctx(avctx);
114 if (avctx->channels > 1) {
115 av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
116 return AVERROR(ENOSYS);
119 avcodec_get_frame_defaults(&s->frame);
120 avctx->coded_frame = &s->frame;
125 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
127 AMRContext *s = avctx->priv_data;
129 Decoder_Interface_exit(s->dec_state);
134 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
135 int *got_frame_ptr, AVPacket *avpkt)
137 const uint8_t *buf = avpkt->data;
138 int buf_size = avpkt->size;
139 AMRContext *s = avctx->priv_data;
140 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
142 int packet_size, ret;
144 av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
145 buf, buf_size, avctx->frame_number);
147 /* get output buffer */
148 s->frame.nb_samples = 160;
149 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
150 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
154 dec_mode = (buf[0] >> 3) & 0x000F;
155 packet_size = block_size[dec_mode] + 1;
157 if (packet_size > buf_size) {
158 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
159 buf_size, packet_size);
160 return AVERROR_INVALIDDATA;
163 av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
164 packet_size, buf[0], buf[1], buf[2], buf[3]);
166 Decoder_Interface_Decode(s->dec_state, buf, (short *)s->frame.data[0], 0);
169 *(AVFrame *)data = s->frame;
174 AVCodec ff_libopencore_amrnb_decoder = {
175 .name = "libopencore_amrnb",
176 .type = AVMEDIA_TYPE_AUDIO,
177 .id = CODEC_ID_AMR_NB,
178 .priv_data_size = sizeof(AMRContext),
179 .init = amr_nb_decode_init,
180 .close = amr_nb_decode_close,
181 .decode = amr_nb_decode_frame,
182 .capabilities = CODEC_CAP_DR1,
183 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
186 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
188 AMRContext *s = avctx->priv_data;
190 if (avctx->sample_rate != 8000) {
191 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
192 return AVERROR(ENOSYS);
195 if (avctx->channels != 1) {
196 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
197 return AVERROR(ENOSYS);
200 avctx->frame_size = 160;
202 ff_af_queue_init(avctx, &s->afq);
203 #if FF_API_OLD_ENCODE_AUDIO
204 avctx->coded_frame = avcodec_alloc_frame();
205 if (!avctx->coded_frame)
206 return AVERROR(ENOMEM);
209 s->enc_state = Encoder_Interface_init(s->enc_dtx);
211 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
212 av_freep(&avctx->coded_frame);
216 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
217 s->enc_bitrate = avctx->bit_rate;
222 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
224 AMRContext *s = avctx->priv_data;
226 Encoder_Interface_exit(s->enc_state);
227 ff_af_queue_close(&s->afq);
228 #if FF_API_OLD_ENCODE_AUDIO
229 av_freep(&avctx->coded_frame);
234 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
235 const AVFrame *frame, int *got_packet_ptr)
237 AMRContext *s = avctx->priv_data;
239 int16_t *flush_buf = NULL;
240 const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
242 if (s->enc_bitrate != avctx->bit_rate) {
243 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
244 s->enc_bitrate = avctx->bit_rate;
247 if ((ret = ff_alloc_packet2(avctx, avpkt, 32))) {
252 if (frame->nb_samples < avctx->frame_size) {
253 flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
255 return AVERROR(ENOMEM);
256 memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
258 if (frame->nb_samples < avctx->frame_size - avctx->delay)
259 s->enc_last_frame = -1;
261 if ((ret = ff_af_queue_add(&s->afq, frame) < 0)) {
262 av_freep(&flush_buf);
266 if (s->enc_last_frame < 0)
268 flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
270 return AVERROR(ENOMEM);
272 s->enc_last_frame = -1;
275 written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
277 av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
278 written, s->enc_mode, frame[0]);
280 /* Get the next frame pts/duration */
281 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
284 avpkt->size = written;
286 av_freep(&flush_buf);
290 AVCodec ff_libopencore_amrnb_encoder = {
291 .name = "libopencore_amrnb",
292 .type = AVMEDIA_TYPE_AUDIO,
293 .id = CODEC_ID_AMR_NB,
294 .priv_data_size = sizeof(AMRContext),
295 .init = amr_nb_encode_init,
296 .encode2 = amr_nb_encode_frame,
297 .close = amr_nb_encode_close,
298 .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME,
299 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
300 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
301 .priv_class = &class,
306 /* -----------AMR wideband ------------*/
307 #if CONFIG_LIBOPENCORE_AMRWB
309 #include <opencore-amrwb/dec_if.h>
310 #include <opencore-amrwb/if_rom.h>
312 typedef struct AMRWBContext {
317 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
319 AMRWBContext *s = avctx->priv_data;
321 s->state = D_IF_init();
323 amr_decode_fix_avctx(avctx);
325 if (avctx->channels > 1) {
326 av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
327 return AVERROR(ENOSYS);
330 avcodec_get_frame_defaults(&s->frame);
331 avctx->coded_frame = &s->frame;
336 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
337 int *got_frame_ptr, AVPacket *avpkt)
339 const uint8_t *buf = avpkt->data;
340 int buf_size = avpkt->size;
341 AMRWBContext *s = avctx->priv_data;
344 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
346 /* get output buffer */
347 s->frame.nb_samples = 320;
348 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
349 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
353 mode = (buf[0] >> 3) & 0x000F;
354 packet_size = block_size[mode];
356 if (packet_size > buf_size) {
357 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
358 buf_size, packet_size + 1);
359 return AVERROR_INVALIDDATA;
362 D_IF_decode(s->state, buf, (short *)s->frame.data[0], _good_frame);
365 *(AVFrame *)data = s->frame;
370 static int amr_wb_decode_close(AVCodecContext *avctx)
372 AMRWBContext *s = avctx->priv_data;
378 AVCodec ff_libopencore_amrwb_decoder = {
379 .name = "libopencore_amrwb",
380 .type = AVMEDIA_TYPE_AUDIO,
381 .id = CODEC_ID_AMR_WB,
382 .priv_data_size = sizeof(AMRWBContext),
383 .init = amr_wb_decode_init,
384 .close = amr_wb_decode_close,
385 .decode = amr_wb_decode_frame,
386 .capabilities = CODEC_CAP_DR1,
387 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
390 #endif /* CONFIG_LIBOPENCORE_AMRWB */