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/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->frame_size = 160 * is_amr_wb;
37 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
40 #if CONFIG_LIBOPENCORE_AMRNB
42 #include <opencore-amrnb/interf_dec.h>
43 #include <opencore-amrnb/interf_enc.h>
45 /* Common code for fixed and float version*/
46 typedef struct AMR_bitrates {
51 /* Match desired bitrate */
52 static int get_bitrate_mode(int bitrate, void *log_ctx)
54 /* make the correspondance between bitrate and mode */
55 static const AMR_bitrates rates[] = {
56 { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
57 { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
59 int i, best = -1, min_diff = 0;
62 for (i = 0; i < 8; i++) {
63 if (rates[i].rate == bitrate)
65 if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
67 min_diff = abs(rates[i].rate - bitrate);
70 /* no bitrate matching exactly, log a warning */
71 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
72 for (i = 0; i < 8; i++)
73 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
74 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
75 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
80 typedef struct AMRContext {
90 static const AVOption options[] = {
91 { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRContext, enc_dtx), FF_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;
104 s->dec_state = Decoder_Interface_init();
106 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
110 amr_decode_fix_avctx(avctx);
112 if (avctx->channels > 1) {
113 av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
114 return AVERROR(ENOSYS);
120 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
122 AMRContext *s = avctx->priv_data;
124 Decoder_Interface_exit(s->dec_state);
128 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
129 int *data_size, AVPacket *avpkt)
131 const uint8_t *buf = avpkt->data;
132 int buf_size = avpkt->size;
133 AMRContext *s = avctx->priv_data;
134 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
138 av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
139 buf, buf_size, s->frame_count);
141 dec_mode = (buf[0] >> 3) & 0x000F;
142 packet_size = block_size[dec_mode] + 1;
144 if (packet_size > buf_size) {
145 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
146 buf_size, packet_size);
147 return AVERROR_INVALIDDATA;
151 av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
152 packet_size, buf[0], buf[1], buf[2], buf[3]);
154 Decoder_Interface_Decode(s->dec_state, buf, data, 0);
155 *data_size = 160 * 2;
160 AVCodec ff_libopencore_amrnb_decoder = {
169 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
172 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
174 AMRContext *s = avctx->priv_data;
178 if (avctx->sample_rate != 8000) {
179 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
180 return AVERROR(ENOSYS);
183 if (avctx->channels != 1) {
184 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
185 return AVERROR(ENOSYS);
188 avctx->frame_size = 160;
189 avctx->coded_frame = avcodec_alloc_frame();
191 s->enc_state = Encoder_Interface_init(s->enc_dtx);
193 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
197 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
198 s->enc_bitrate = avctx->bit_rate;
203 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
205 AMRContext *s = avctx->priv_data;
207 Encoder_Interface_exit(s->enc_state);
208 av_freep(&avctx->coded_frame);
212 static int amr_nb_encode_frame(AVCodecContext *avctx,
213 unsigned char *frame/*out*/,
214 int buf_size, void *data/*in*/)
216 AMRContext *s = avctx->priv_data;
219 if (s->enc_bitrate != avctx->bit_rate) {
220 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
221 s->enc_bitrate = avctx->bit_rate;
224 written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, data,
226 av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
227 written, s->enc_mode, frame[0]);
232 AVCodec ff_libopencore_amrnb_encoder = {
241 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
242 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
243 .priv_class = &class,
248 /* -----------AMR wideband ------------*/
249 #if CONFIG_LIBOPENCORE_AMRWB
251 #include <opencore-amrwb/dec_if.h>
252 #include <opencore-amrwb/if_rom.h>
254 typedef struct AMRWBContext {
258 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
260 AMRWBContext *s = avctx->priv_data;
262 s->state = D_IF_init();
264 amr_decode_fix_avctx(avctx);
266 if (avctx->channels > 1) {
267 av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
268 return AVERROR(ENOSYS);
274 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
275 int *data_size, AVPacket *avpkt)
277 const uint8_t *buf = avpkt->data;
278 int buf_size = avpkt->size;
279 AMRWBContext *s = avctx->priv_data;
282 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
288 mode = (buf[0] >> 3) & 0x000F;
289 packet_size = block_size[mode];
291 if (packet_size > buf_size) {
292 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
293 buf_size, packet_size + 1);
294 return AVERROR_INVALIDDATA;
297 D_IF_decode(s->state, buf, data, _good_frame);
298 *data_size = 320 * 2;
302 static int amr_wb_decode_close(AVCodecContext *avctx)
304 AMRWBContext *s = avctx->priv_data;
310 AVCodec ff_libopencore_amrwb_decoder = {
314 sizeof(AMRWBContext),
319 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
322 #endif /* CONFIG_LIBOPENCORE_AMRWB */