2 * AMR Audio decoder stub
3 * Copyright (c) 2003 the ffmpeg project
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/avstring.h"
23 #include "libavutil/channel_layout.h"
24 #include "libavutil/common.h"
25 #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 avctx->sample_rate = 8000 * is_amr_wb;
36 if (avctx->channels > 1) {
37 avpriv_report_missing_feature(avctx, "multi-channel AMR");
38 return AVERROR_PATCHWELCOME;
42 avctx->channel_layout = AV_CH_LAYOUT_MONO;
43 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
47 #if CONFIG_LIBOPENCORE_AMRNB
49 #include <opencore-amrnb/interf_dec.h>
50 #include <opencore-amrnb/interf_enc.h>
52 typedef struct AMRContext {
63 #if CONFIG_LIBOPENCORE_AMRNB_DECODER
64 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
66 AMRContext *s = avctx->priv_data;
69 if ((ret = amr_decode_fix_avctx(avctx)) < 0)
72 s->dec_state = Decoder_Interface_init();
74 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
81 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
83 AMRContext *s = avctx->priv_data;
85 Decoder_Interface_exit(s->dec_state);
90 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
91 int *got_frame_ptr, AVPacket *avpkt)
93 AVFrame *frame = data;
94 const uint8_t *buf = avpkt->data;
95 int buf_size = avpkt->size;
96 AMRContext *s = avctx->priv_data;
97 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
101 av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
102 buf, buf_size, avctx->frame_number);
104 /* get output buffer */
105 frame->nb_samples = 160;
106 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
107 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
111 dec_mode = (buf[0] >> 3) & 0x000F;
112 packet_size = block_size[dec_mode] + 1;
114 if (packet_size > buf_size) {
115 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
116 buf_size, packet_size);
117 return AVERROR_INVALIDDATA;
120 av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
121 packet_size, buf[0], buf[1], buf[2], buf[3]);
123 Decoder_Interface_Decode(s->dec_state, buf, (short *)frame->data[0], 0);
130 AVCodec ff_libopencore_amrnb_decoder = {
131 .name = "libopencore_amrnb",
132 .type = AVMEDIA_TYPE_AUDIO,
133 .id = AV_CODEC_ID_AMR_NB,
134 .priv_data_size = sizeof(AMRContext),
135 .init = amr_nb_decode_init,
136 .close = amr_nb_decode_close,
137 .decode = amr_nb_decode_frame,
138 .capabilities = CODEC_CAP_DR1,
139 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
141 #endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */
143 #if CONFIG_LIBOPENCORE_AMRNB_ENCODER
144 /* Common code for fixed and float version*/
145 typedef struct AMR_bitrates {
150 /* Match desired bitrate */
151 static int get_bitrate_mode(int bitrate, void *log_ctx)
153 /* make the correspondance between bitrate and mode */
154 static const AMR_bitrates rates[] = {
155 { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
156 { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
158 int i, best = -1, min_diff = 0;
161 for (i = 0; i < 8; i++) {
162 if (rates[i].rate == bitrate)
163 return rates[i].mode;
164 if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
166 min_diff = abs(rates[i].rate - bitrate);
169 /* no bitrate matching exactly, log a warning */
170 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
171 for (i = 0; i < 8; i++)
172 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
173 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
174 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
179 static const AVOption options[] = {
180 { "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 },
184 static const AVClass class = {
185 "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
188 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
190 AMRContext *s = avctx->priv_data;
192 if (avctx->sample_rate != 8000) {
193 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
194 return AVERROR(ENOSYS);
197 if (avctx->channels != 1) {
198 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
199 return AVERROR(ENOSYS);
202 avctx->frame_size = 160;
204 ff_af_queue_init(avctx, &s->afq);
206 s->enc_state = Encoder_Interface_init(s->enc_dtx);
208 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
209 av_freep(&avctx->coded_frame);
213 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
214 s->enc_bitrate = avctx->bit_rate;
219 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
221 AMRContext *s = avctx->priv_data;
223 Encoder_Interface_exit(s->enc_state);
224 ff_af_queue_close(&s->afq);
228 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
229 const AVFrame *frame, int *got_packet_ptr)
231 AMRContext *s = avctx->priv_data;
233 int16_t *flush_buf = NULL;
234 const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
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;
241 if ((ret = ff_alloc_packet(avpkt, 32))) {
242 av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
247 if (frame->nb_samples < avctx->frame_size) {
248 flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
250 return AVERROR(ENOMEM);
251 memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
253 if (frame->nb_samples < avctx->frame_size - avctx->delay)
254 s->enc_last_frame = -1;
256 if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
257 av_freep(&flush_buf);
261 if (s->enc_last_frame < 0)
263 flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
265 return AVERROR(ENOMEM);
267 s->enc_last_frame = -1;
270 written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
272 av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
273 written, s->enc_mode, frame[0]);
275 /* Get the next frame pts/duration */
276 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
279 avpkt->size = written;
281 av_freep(&flush_buf);
285 AVCodec ff_libopencore_amrnb_encoder = {
286 .name = "libopencore_amrnb",
287 .type = AVMEDIA_TYPE_AUDIO,
288 .id = AV_CODEC_ID_AMR_NB,
289 .priv_data_size = sizeof(AMRContext),
290 .init = amr_nb_encode_init,
291 .encode2 = amr_nb_encode_frame,
292 .close = amr_nb_encode_close,
293 .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME,
294 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
295 AV_SAMPLE_FMT_NONE },
296 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
297 .priv_class = &class,
299 #endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */
301 #endif /* CONFIG_LIBOPENCORE_AMRNB */
303 /* -----------AMR wideband ------------*/
304 #if CONFIG_LIBOPENCORE_AMRWB_DECODER
306 #include <opencore-amrwb/dec_if.h>
307 #include <opencore-amrwb/if_rom.h>
309 typedef struct AMRWBContext {
313 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
315 AMRWBContext *s = avctx->priv_data;
318 if ((ret = amr_decode_fix_avctx(avctx)) < 0)
321 s->state = D_IF_init();
326 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
327 int *got_frame_ptr, AVPacket *avpkt)
329 AVFrame *frame = data;
330 const uint8_t *buf = avpkt->data;
331 int buf_size = avpkt->size;
332 AMRWBContext *s = avctx->priv_data;
335 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
337 /* get output buffer */
338 frame->nb_samples = 320;
339 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
340 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
344 mode = (buf[0] >> 3) & 0x000F;
345 packet_size = block_size[mode];
347 if (packet_size > buf_size) {
348 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
349 buf_size, packet_size + 1);
350 return AVERROR_INVALIDDATA;
353 D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame);
360 static int amr_wb_decode_close(AVCodecContext *avctx)
362 AMRWBContext *s = avctx->priv_data;
368 AVCodec ff_libopencore_amrwb_decoder = {
369 .name = "libopencore_amrwb",
370 .type = AVMEDIA_TYPE_AUDIO,
371 .id = AV_CODEC_ID_AMR_WB,
372 .priv_data_size = sizeof(AMRWBContext),
373 .init = amr_wb_decode_init,
374 .close = amr_wb_decode_close,
375 .decode = amr_wb_decode_frame,
376 .capabilities = CODEC_CAP_DR1,
377 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
380 #endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */