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/common.h"
25 #include "libavutil/opt.h"
26 #include "audio_frame_queue.h"
29 static void amr_decode_fix_avctx(AVCodecContext *avctx)
31 const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB);
33 if (!avctx->sample_rate)
34 avctx->sample_rate = 8000 * is_amr_wb;
39 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
42 #if CONFIG_LIBOPENCORE_AMRNB
44 #include <opencore-amrnb/interf_dec.h>
45 #include <opencore-amrnb/interf_enc.h>
47 /* Common code for fixed and float version*/
48 typedef struct AMR_bitrates {
53 /* Match desired bitrate */
54 static int get_bitrate_mode(int bitrate, void *log_ctx)
56 /* make the correspondance between bitrate and mode */
57 static const AMR_bitrates rates[] = {
58 { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
59 { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
61 int i, best = -1, min_diff = 0;
64 for (i = 0; i < 8; i++) {
65 if (rates[i].rate == bitrate)
67 if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
69 min_diff = abs(rates[i].rate - bitrate);
72 /* no bitrate matching exactly, log a warning */
73 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
74 for (i = 0; i < 8; i++)
75 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
76 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
77 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
82 typedef struct AMRContext {
94 static const AVOption options[] = {
95 { "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 },
99 static const AVClass class = {
100 "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
103 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
105 AMRContext *s = avctx->priv_data;
107 s->dec_state = Decoder_Interface_init();
109 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
113 amr_decode_fix_avctx(avctx);
115 if (avctx->channels > 1) {
116 av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
117 return AVERROR(ENOSYS);
120 avcodec_get_frame_defaults(&s->frame);
121 avctx->coded_frame = &s->frame;
126 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
128 AMRContext *s = avctx->priv_data;
130 Decoder_Interface_exit(s->dec_state);
135 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
136 int *got_frame_ptr, AVPacket *avpkt)
138 const uint8_t *buf = avpkt->data;
139 int buf_size = avpkt->size;
140 AMRContext *s = avctx->priv_data;
141 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
143 int packet_size, ret;
145 av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
146 buf, buf_size, avctx->frame_number);
148 /* get output buffer */
149 s->frame.nb_samples = 160;
150 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
151 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
155 dec_mode = (buf[0] >> 3) & 0x000F;
156 packet_size = block_size[dec_mode] + 1;
158 if (packet_size > buf_size) {
159 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
160 buf_size, packet_size);
161 return AVERROR_INVALIDDATA;
164 av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
165 packet_size, buf[0], buf[1], buf[2], buf[3]);
167 Decoder_Interface_Decode(s->dec_state, buf, (short *)s->frame.data[0], 0);
170 *(AVFrame *)data = s->frame;
175 AVCodec ff_libopencore_amrnb_decoder = {
176 .name = "libopencore_amrnb",
177 .type = AVMEDIA_TYPE_AUDIO,
178 .id = AV_CODEC_ID_AMR_NB,
179 .priv_data_size = sizeof(AMRContext),
180 .init = amr_nb_decode_init,
181 .close = amr_nb_decode_close,
182 .decode = amr_nb_decode_frame,
183 .capabilities = CODEC_CAP_DR1,
184 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
187 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
189 AMRContext *s = avctx->priv_data;
191 if (avctx->sample_rate != 8000) {
192 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
193 return AVERROR(ENOSYS);
196 if (avctx->channels != 1) {
197 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
198 return AVERROR(ENOSYS);
201 avctx->frame_size = 160;
203 ff_af_queue_init(avctx, &s->afq);
204 #if FF_API_OLD_ENCODE_AUDIO
205 avctx->coded_frame = avcodec_alloc_frame();
206 if (!avctx->coded_frame)
207 return AVERROR(ENOMEM);
210 s->enc_state = Encoder_Interface_init(s->enc_dtx);
212 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
213 av_freep(&avctx->coded_frame);
217 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
218 s->enc_bitrate = avctx->bit_rate;
223 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
225 AMRContext *s = avctx->priv_data;
227 Encoder_Interface_exit(s->enc_state);
228 ff_af_queue_close(&s->afq);
229 #if FF_API_OLD_ENCODE_AUDIO
230 av_freep(&avctx->coded_frame);
235 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
236 const AVFrame *frame, int *got_packet_ptr)
238 AMRContext *s = avctx->priv_data;
240 int16_t *flush_buf = NULL;
241 const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
243 if (s->enc_bitrate != avctx->bit_rate) {
244 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
245 s->enc_bitrate = avctx->bit_rate;
248 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 = AV_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,
300 AV_SAMPLE_FMT_NONE },
301 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
302 .priv_class = &class,
307 /* -----------AMR wideband ------------*/
308 #if CONFIG_LIBOPENCORE_AMRWB
310 #include <opencore-amrwb/dec_if.h>
311 #include <opencore-amrwb/if_rom.h>
313 typedef struct AMRWBContext {
318 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
320 AMRWBContext *s = avctx->priv_data;
322 s->state = D_IF_init();
324 amr_decode_fix_avctx(avctx);
326 if (avctx->channels > 1) {
327 av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
328 return AVERROR(ENOSYS);
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 */