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
24 #include "libavutil/avstring.h"
25 #include "libavutil/channel_layout.h"
26 #include "libavutil/common.h"
27 #include "libavutil/opt.h"
29 #include "audio_frame_queue.h"
32 static int amr_decode_fix_avctx(AVCodecContext *avctx)
34 const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB);
36 avctx->sample_rate = 8000 * is_amr_wb;
38 if (avctx->channels > 1) {
39 avpriv_report_missing_feature(avctx, "multi-channel AMR");
40 return AVERROR_PATCHWELCOME;
44 avctx->channel_layout = AV_CH_LAYOUT_MONO;
45 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
49 #if CONFIG_LIBOPENCORE_AMRNB
51 #include <opencore-amrnb/interf_dec.h>
52 #include <opencore-amrnb/interf_enc.h>
54 typedef struct AMRContext {
65 #if CONFIG_LIBOPENCORE_AMRNB_DECODER
66 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
68 AMRContext *s = avctx->priv_data;
71 if ((ret = amr_decode_fix_avctx(avctx)) < 0)
74 s->dec_state = Decoder_Interface_init();
76 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
83 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
85 AMRContext *s = avctx->priv_data;
87 Decoder_Interface_exit(s->dec_state);
92 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
93 int *got_frame_ptr, AVPacket *avpkt)
95 AVFrame *frame = data;
96 const uint8_t *buf = avpkt->data;
97 int buf_size = avpkt->size;
98 AMRContext *s = avctx->priv_data;
99 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
101 int packet_size, ret;
103 ff_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
104 buf, buf_size, avctx->frame_number);
106 /* get output buffer */
107 frame->nb_samples = 160;
108 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
109 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
113 dec_mode = (buf[0] >> 3) & 0x000F;
114 packet_size = block_size[dec_mode] + 1;
116 if (packet_size > buf_size) {
117 av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
118 buf_size, packet_size);
119 return AVERROR_INVALIDDATA;
122 ff_dlog(avctx, "packet_size=%d buf= 0x%"PRIx8" %"PRIx8" %"PRIx8" %"PRIx8"\n",
123 packet_size, buf[0], buf[1], buf[2], buf[3]);
125 Decoder_Interface_Decode(s->dec_state, buf, (short *)frame->data[0], 0);
132 AVCodec ff_libopencore_amrnb_decoder = {
133 .name = "libopencore_amrnb",
134 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
135 .type = AVMEDIA_TYPE_AUDIO,
136 .id = AV_CODEC_ID_AMR_NB,
137 .priv_data_size = sizeof(AMRContext),
138 .init = amr_nb_decode_init,
139 .close = amr_nb_decode_close,
140 .decode = amr_nb_decode_frame,
141 .capabilities = AV_CODEC_CAP_DR1,
143 #endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */
145 #if CONFIG_LIBOPENCORE_AMRNB_ENCODER
146 /* Common code for fixed and float version*/
147 typedef struct AMR_bitrates {
152 /* Match desired bitrate */
153 static int get_bitrate_mode(int bitrate, void *log_ctx)
155 /* make the correspondence between bitrate and mode */
156 static const AMR_bitrates rates[] = {
157 { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
158 { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
160 int i, best = -1, min_diff = 0;
163 for (i = 0; i < 8; i++) {
164 if (rates[i].rate == bitrate)
165 return rates[i].mode;
166 if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
168 min_diff = abs(rates[i].rate - bitrate);
171 /* no bitrate matching exactly, log a warning */
172 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
173 for (i = 0; i < 8; i++)
174 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
175 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
176 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
181 static const AVOption options[] = {
182 { "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 },
186 static const AVClass class = {
187 "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
190 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
192 AMRContext *s = avctx->priv_data;
194 if (avctx->sample_rate != 8000) {
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;
205 avctx->initial_padding = 50;
206 ff_af_queue_init(avctx, &s->afq);
208 s->enc_state = Encoder_Interface_init(s->enc_dtx);
210 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
214 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
215 s->enc_bitrate = avctx->bit_rate;
220 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
222 AMRContext *s = avctx->priv_data;
224 Encoder_Interface_exit(s->enc_state);
225 ff_af_queue_close(&s->afq);
229 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
230 const AVFrame *frame, int *got_packet_ptr)
232 AMRContext *s = avctx->priv_data;
234 int16_t *flush_buf = NULL;
235 const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
237 if (s->enc_bitrate != avctx->bit_rate) {
238 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
239 s->enc_bitrate = avctx->bit_rate;
242 if ((ret = ff_alloc_packet(avpkt, 32))) {
243 av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
248 if (frame->nb_samples < avctx->frame_size) {
249 flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
251 return AVERROR(ENOMEM);
252 memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
254 if (frame->nb_samples < avctx->frame_size - avctx->initial_padding)
255 s->enc_last_frame = -1;
257 if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
258 av_freep(&flush_buf);
262 if (s->enc_last_frame < 0)
264 flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
266 return AVERROR(ENOMEM);
268 s->enc_last_frame = -1;
271 written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
273 ff_dlog(avctx, "amr_nb_encode_frame encoded %d bytes, bitrate %d, first byte was %#02"PRIx8"\n",
274 written, s->enc_mode, *frame->data[0]);
276 /* Get the next frame pts/duration */
277 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
280 avpkt->size = written;
282 av_freep(&flush_buf);
286 AVCodec ff_libopencore_amrnb_encoder = {
287 .name = "libopencore_amrnb",
288 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
289 .type = AVMEDIA_TYPE_AUDIO,
290 .id = AV_CODEC_ID_AMR_NB,
291 .priv_data_size = sizeof(AMRContext),
292 .init = amr_nb_encode_init,
293 .encode2 = amr_nb_encode_frame,
294 .close = amr_nb_encode_close,
295 .capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SMALL_LAST_FRAME,
296 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
297 AV_SAMPLE_FMT_NONE },
298 .priv_class = &class,
300 #endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */
302 #endif /* CONFIG_LIBOPENCORE_AMRNB */
304 /* -----------AMR wideband ------------*/
305 #if CONFIG_LIBOPENCORE_AMRWB_DECODER
307 #include <opencore-amrwb/dec_if.h>
308 #include <opencore-amrwb/if_rom.h>
310 typedef struct AMRWBContext {
314 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
316 AMRWBContext *s = avctx->priv_data;
319 if ((ret = amr_decode_fix_avctx(avctx)) < 0)
322 s->state = D_IF_init();
327 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
328 int *got_frame_ptr, AVPacket *avpkt)
330 AVFrame *frame = data;
331 const uint8_t *buf = avpkt->data;
332 int buf_size = avpkt->size;
333 AMRWBContext *s = avctx->priv_data;
336 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
338 /* get output buffer */
339 frame->nb_samples = 320;
340 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
341 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
345 mode = (buf[0] >> 3) & 0x000F;
346 packet_size = block_size[mode];
348 if (packet_size > buf_size) {
349 av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
350 buf_size, packet_size + 1);
351 return AVERROR_INVALIDDATA;
354 D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame);
361 static int amr_wb_decode_close(AVCodecContext *avctx)
363 AMRWBContext *s = avctx->priv_data;
369 AVCodec ff_libopencore_amrwb_decoder = {
370 .name = "libopencore_amrwb",
371 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
372 .type = AVMEDIA_TYPE_AUDIO,
373 .id = AV_CODEC_ID_AMR_WB,
374 .priv_data_size = sizeof(AMRWBContext),
375 .init = amr_wb_decode_init,
376 .close = amr_wb_decode_close,
377 .decode = amr_wb_decode_frame,
378 .capabilities = AV_CODEC_CAP_DR1,
381 #endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */