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
22 #include "libavutil/audioconvert.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/common.h"
26 #include "libavutil/opt.h"
27 #include "audio_frame_queue.h"
30 static int amr_decode_fix_avctx(AVCodecContext *avctx)
32 const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB);
34 if (!avctx->sample_rate)
35 avctx->sample_rate = 8000 * is_amr_wb;
37 if (avctx->channels > 1) {
38 av_log_missing_feature(avctx, "multi-channel AMR", 0);
39 return AVERROR_PATCHWELCOME;
43 avctx->channel_layout = AV_CH_LAYOUT_MONO;
44 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
48 #if CONFIG_LIBOPENCORE_AMRNB
50 #include <opencore-amrnb/interf_dec.h>
51 #include <opencore-amrnb/interf_enc.h>
53 /* Common code for fixed and float version*/
54 typedef struct AMR_bitrates {
59 /* Match desired bitrate */
60 static int get_bitrate_mode(int bitrate, void *log_ctx)
62 /* make the correspondance between bitrate and mode */
63 static const AMR_bitrates rates[] = {
64 { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
65 { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
67 int i, best = -1, min_diff = 0;
70 for (i = 0; i < 8; i++) {
71 if (rates[i].rate == bitrate)
73 if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
75 min_diff = abs(rates[i].rate - bitrate);
78 /* no bitrate matching exactly, log a warning */
79 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
80 for (i = 0; i < 8; i++)
81 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
82 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
83 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
88 typedef struct AMRContext {
100 static const AVOption options[] = {
101 { "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 },
105 static const AVClass class = {
106 "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
109 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
111 AMRContext *s = avctx->priv_data;
114 if ((ret = amr_decode_fix_avctx(avctx)) < 0)
117 s->dec_state = Decoder_Interface_init();
119 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
123 avcodec_get_frame_defaults(&s->frame);
124 avctx->coded_frame = &s->frame;
129 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
131 AMRContext *s = avctx->priv_data;
133 Decoder_Interface_exit(s->dec_state);
138 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
139 int *got_frame_ptr, AVPacket *avpkt)
141 const uint8_t *buf = avpkt->data;
142 int buf_size = avpkt->size;
143 AMRContext *s = avctx->priv_data;
144 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
146 int packet_size, ret;
148 av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
149 buf, buf_size, avctx->frame_number);
151 /* get output buffer */
152 s->frame.nb_samples = 160;
153 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
154 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
158 dec_mode = (buf[0] >> 3) & 0x000F;
159 packet_size = block_size[dec_mode] + 1;
161 if (packet_size > buf_size) {
162 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
163 buf_size, packet_size);
164 return AVERROR_INVALIDDATA;
167 av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
168 packet_size, buf[0], buf[1], buf[2], buf[3]);
170 Decoder_Interface_Decode(s->dec_state, buf, (short *)s->frame.data[0], 0);
173 *(AVFrame *)data = s->frame;
178 AVCodec ff_libopencore_amrnb_decoder = {
179 .name = "libopencore_amrnb",
180 .type = AVMEDIA_TYPE_AUDIO,
181 .id = AV_CODEC_ID_AMR_NB,
182 .priv_data_size = sizeof(AMRContext),
183 .init = amr_nb_decode_init,
184 .close = amr_nb_decode_close,
185 .decode = amr_nb_decode_frame,
186 .capabilities = CODEC_CAP_DR1,
187 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
190 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
192 AMRContext *s = avctx->priv_data;
194 if (avctx->sample_rate != 8000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
195 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
196 return AVERROR(ENOSYS);
199 if (avctx->channels != 1) {
200 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
201 return AVERROR(ENOSYS);
204 avctx->frame_size = 160;
206 ff_af_queue_init(avctx, &s->afq);
207 #if FF_API_OLD_ENCODE_AUDIO
208 avctx->coded_frame = avcodec_alloc_frame();
209 if (!avctx->coded_frame)
210 return AVERROR(ENOMEM);
213 s->enc_state = Encoder_Interface_init(s->enc_dtx);
215 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
216 av_freep(&avctx->coded_frame);
220 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
221 s->enc_bitrate = avctx->bit_rate;
226 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
228 AMRContext *s = avctx->priv_data;
230 Encoder_Interface_exit(s->enc_state);
231 ff_af_queue_close(&s->afq);
232 #if FF_API_OLD_ENCODE_AUDIO
233 av_freep(&avctx->coded_frame);
238 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
239 const AVFrame *frame, int *got_packet_ptr)
241 AMRContext *s = avctx->priv_data;
243 int16_t *flush_buf = NULL;
244 const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
246 if (s->enc_bitrate != avctx->bit_rate) {
247 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
248 s->enc_bitrate = avctx->bit_rate;
251 if ((ret = ff_alloc_packet2(avctx, avpkt, 32)))
255 if (frame->nb_samples < avctx->frame_size) {
256 flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
258 return AVERROR(ENOMEM);
259 memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
261 if (frame->nb_samples < avctx->frame_size - avctx->delay)
262 s->enc_last_frame = -1;
264 if ((ret = ff_af_queue_add(&s->afq, frame) < 0)) {
265 av_freep(&flush_buf);
269 if (s->enc_last_frame < 0)
271 flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
273 return AVERROR(ENOMEM);
275 s->enc_last_frame = -1;
278 written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
280 av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
281 written, s->enc_mode, avpkt->data[0]);
283 /* Get the next frame pts/duration */
284 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
287 avpkt->size = written;
289 av_freep(&flush_buf);
293 AVCodec ff_libopencore_amrnb_encoder = {
294 .name = "libopencore_amrnb",
295 .type = AVMEDIA_TYPE_AUDIO,
296 .id = AV_CODEC_ID_AMR_NB,
297 .priv_data_size = sizeof(AMRContext),
298 .init = amr_nb_encode_init,
299 .encode2 = amr_nb_encode_frame,
300 .close = amr_nb_encode_close,
301 .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME,
302 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
303 AV_SAMPLE_FMT_NONE },
304 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
305 .priv_class = &class,
310 /* -----------AMR wideband ------------*/
311 #if CONFIG_LIBOPENCORE_AMRWB
313 #include <opencore-amrwb/dec_if.h>
314 #include <opencore-amrwb/if_rom.h>
316 typedef struct AMRWBContext {
321 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
323 AMRWBContext *s = avctx->priv_data;
326 if ((ret = amr_decode_fix_avctx(avctx)) < 0)
329 s->state = D_IF_init();
331 avcodec_get_frame_defaults(&s->frame);
332 avctx->coded_frame = &s->frame;
337 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
338 int *got_frame_ptr, AVPacket *avpkt)
340 const uint8_t *buf = avpkt->data;
341 int buf_size = avpkt->size;
342 AMRWBContext *s = avctx->priv_data;
345 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
347 /* get output buffer */
348 s->frame.nb_samples = 320;
349 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
350 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
354 mode = (buf[0] >> 3) & 0x000F;
355 packet_size = block_size[mode];
357 if (packet_size > buf_size) {
358 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
359 buf_size, packet_size + 1);
360 return AVERROR_INVALIDDATA;
363 D_IF_decode(s->state, buf, (short *)s->frame.data[0], _good_frame);
366 *(AVFrame *)data = s->frame;
371 static int amr_wb_decode_close(AVCodecContext *avctx)
373 AMRWBContext *s = avctx->priv_data;
379 AVCodec ff_libopencore_amrwb_decoder = {
380 .name = "libopencore_amrwb",
381 .type = AVMEDIA_TYPE_AUDIO,
382 .id = AV_CODEC_ID_AMR_WB,
383 .priv_data_size = sizeof(AMRWBContext),
384 .init = amr_wb_decode_init,
385 .close = amr_wb_decode_close,
386 .decode = amr_wb_decode_frame,
387 .capabilities = CODEC_CAP_DR1,
388 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
391 #endif /* CONFIG_LIBOPENCORE_AMRWB */