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
23 #include "libavutil/avstring.h"
24 #include "libavutil/opt.h"
26 static void amr_decode_fix_avctx(AVCodecContext *avctx)
28 const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
30 if (!avctx->sample_rate)
31 avctx->sample_rate = 8000 * is_amr_wb;
36 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
39 #if CONFIG_LIBOPENCORE_AMRNB
41 #include <opencore-amrnb/interf_dec.h>
42 #include <opencore-amrnb/interf_enc.h>
44 /* Common code for fixed and float version*/
45 typedef struct AMR_bitrates {
50 /* Match desired bitrate */
51 static int get_bitrate_mode(int bitrate, void *log_ctx)
53 /* make the correspondance between bitrate and mode */
54 static const AMR_bitrates rates[] = {
55 { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
56 { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
58 int i, best = -1, min_diff = 0;
61 for (i = 0; i < 8; i++) {
62 if (rates[i].rate == bitrate)
64 if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
66 min_diff = abs(rates[i].rate - bitrate);
69 /* no bitrate matching exactly, log a warning */
70 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
71 for (i = 0; i < 8; i++)
72 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
73 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
74 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
79 typedef struct AMRContext {
90 static const AVOption options[] = {
91 { "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 },
95 static const AVClass class = {
96 "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
99 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
101 AMRContext *s = avctx->priv_data;
103 s->dec_state = Decoder_Interface_init();
105 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
109 amr_decode_fix_avctx(avctx);
111 if (avctx->channels > 1) {
112 av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
113 return AVERROR(ENOSYS);
116 avcodec_get_frame_defaults(&s->frame);
117 avctx->coded_frame = &s->frame;
122 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
124 AMRContext *s = avctx->priv_data;
126 Decoder_Interface_exit(s->dec_state);
131 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
132 int *got_frame_ptr, AVPacket *avpkt)
134 const uint8_t *buf = avpkt->data;
135 int buf_size = avpkt->size;
136 AMRContext *s = avctx->priv_data;
137 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
139 int packet_size, ret;
141 av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
142 buf, buf_size, avctx->frame_number);
144 /* get output buffer */
145 s->frame.nb_samples = 160;
146 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
147 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
151 dec_mode = (buf[0] >> 3) & 0x000F;
152 packet_size = block_size[dec_mode] + 1;
154 if (packet_size > buf_size) {
155 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
156 buf_size, packet_size);
157 return AVERROR_INVALIDDATA;
160 av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
161 packet_size, buf[0], buf[1], buf[2], buf[3]);
163 Decoder_Interface_Decode(s->dec_state, buf, (short *)s->frame.data[0], 0);
166 *(AVFrame *)data = s->frame;
171 AVCodec ff_libopencore_amrnb_decoder = {
172 .name = "libopencore_amrnb",
173 .type = AVMEDIA_TYPE_AUDIO,
174 .id = CODEC_ID_AMR_NB,
175 .priv_data_size = sizeof(AMRContext),
176 .init = amr_nb_decode_init,
177 .close = amr_nb_decode_close,
178 .decode = amr_nb_decode_frame,
179 .capabilities = CODEC_CAP_DR1,
180 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
183 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
185 AMRContext *s = avctx->priv_data;
187 if (avctx->sample_rate != 8000) {
188 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
189 return AVERROR(ENOSYS);
192 if (avctx->channels != 1) {
193 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
194 return AVERROR(ENOSYS);
197 avctx->frame_size = 160;
199 avctx->coded_frame = avcodec_alloc_frame();
200 if (!avctx->coded_frame)
201 return AVERROR(ENOMEM);
203 s->enc_state = Encoder_Interface_init(s->enc_dtx);
205 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
206 av_freep(&avctx->coded_frame);
210 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
211 s->enc_bitrate = avctx->bit_rate;
216 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
218 AMRContext *s = avctx->priv_data;
220 Encoder_Interface_exit(s->enc_state);
221 av_freep(&avctx->coded_frame);
225 static int amr_nb_encode_frame(AVCodecContext *avctx,
226 unsigned char *frame/*out*/,
227 int buf_size, void *data/*in*/)
229 AMRContext *s = avctx->priv_data;
231 int16_t *flush_buf = NULL;
232 const int16_t *samples = data;
234 if (s->enc_bitrate != avctx->bit_rate) {
235 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
236 s->enc_bitrate = avctx->bit_rate;
240 if (avctx->frame_size < 160) {
241 flush_buf = av_mallocz(160 * sizeof(*flush_buf));
243 return AVERROR(ENOMEM);
244 memcpy(flush_buf, samples, avctx->frame_size * sizeof(*flush_buf));
246 if (avctx->frame_size < 110)
247 s->enc_last_frame = -1;
250 if (s->enc_last_frame < 0)
252 flush_buf = av_mallocz(160 * sizeof(*flush_buf));
254 return AVERROR(ENOMEM);
256 s->enc_last_frame = -1;
259 written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
261 av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
262 written, s->enc_mode, frame[0]);
264 av_freep(&flush_buf);
268 AVCodec ff_libopencore_amrnb_encoder = {
269 .name = "libopencore_amrnb",
270 .type = AVMEDIA_TYPE_AUDIO,
271 .id = CODEC_ID_AMR_NB,
272 .priv_data_size = sizeof(AMRContext),
273 .init = amr_nb_encode_init,
274 .encode = amr_nb_encode_frame,
275 .close = amr_nb_encode_close,
276 .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME,
277 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
278 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
279 .priv_class = &class,
284 /* -----------AMR wideband ------------*/
285 #if CONFIG_LIBOPENCORE_AMRWB
287 #include <opencore-amrwb/dec_if.h>
288 #include <opencore-amrwb/if_rom.h>
290 typedef struct AMRWBContext {
295 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
297 AMRWBContext *s = avctx->priv_data;
299 s->state = D_IF_init();
301 amr_decode_fix_avctx(avctx);
303 if (avctx->channels > 1) {
304 av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
305 return AVERROR(ENOSYS);
308 avcodec_get_frame_defaults(&s->frame);
309 avctx->coded_frame = &s->frame;
314 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
315 int *got_frame_ptr, AVPacket *avpkt)
317 const uint8_t *buf = avpkt->data;
318 int buf_size = avpkt->size;
319 AMRWBContext *s = avctx->priv_data;
322 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
324 /* get output buffer */
325 s->frame.nb_samples = 320;
326 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
327 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
331 mode = (buf[0] >> 3) & 0x000F;
332 packet_size = block_size[mode];
334 if (packet_size > buf_size) {
335 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
336 buf_size, packet_size + 1);
337 return AVERROR_INVALIDDATA;
340 D_IF_decode(s->state, buf, (short *)s->frame.data[0], _good_frame);
343 *(AVFrame *)data = s->frame;
348 static int amr_wb_decode_close(AVCodecContext *avctx)
350 AMRWBContext *s = avctx->priv_data;
356 AVCodec ff_libopencore_amrwb_decoder = {
357 .name = "libopencore_amrwb",
358 .type = AVMEDIA_TYPE_AUDIO,
359 .id = CODEC_ID_AMR_WB,
360 .priv_data_size = sizeof(AMRWBContext),
361 .init = amr_wb_decode_init,
362 .close = amr_wb_decode_close,
363 .decode = amr_wb_decode_frame,
364 .capabilities = CODEC_CAP_DR1,
365 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
368 #endif /* CONFIG_LIBOPENCORE_AMRWB */