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 static void amr_decode_fix_avctx(AVCodecContext *avctx)
26 const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
28 if (!avctx->sample_rate)
29 avctx->sample_rate = 8000 * is_amr_wb;
34 avctx->frame_size = 160 * is_amr_wb;
35 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
38 #if CONFIG_LIBOPENCORE_AMRNB
40 #include <opencore-amrnb/interf_dec.h>
41 #include <opencore-amrnb/interf_enc.h>
43 static const char nb_bitrate_unsupported[] =
44 "bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k\n";
46 /* Common code for fixed and float version*/
47 typedef struct AMR_bitrates {
52 /* Match desired bitrate */
53 static int getBitrateMode(int bitrate)
55 /* make the correspondance between bitrate and mode */
56 static const AMR_bitrates rates[] = {{ 4750, MR475},
66 for (i = 0; i < 8; i++)
67 if (rates[i].rate == bitrate)
69 /* no bitrate matching, return an error */
73 typedef struct AMRContext {
80 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
82 AMRContext *s = avctx->priv_data;
85 s->decState = Decoder_Interface_init();
87 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
91 amr_decode_fix_avctx(avctx);
93 if (avctx->channels > 1) {
94 av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
95 return AVERROR(ENOSYS);
101 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
103 AMRContext *s = avctx->priv_data;
105 Decoder_Interface_exit(s->decState);
109 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
110 int *data_size, AVPacket *avpkt)
112 const uint8_t *buf = avpkt->data;
113 int buf_size = avpkt->size;
114 AMRContext *s = avctx->priv_data;
115 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
119 /* av_log(NULL, AV_LOG_DEBUG, "amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",
120 buf, buf_size, s->frameCount); */
122 dec_mode = (buf[0] >> 3) & 0x000F;
123 packet_size = block_size[dec_mode] + 1;
125 if (packet_size > buf_size) {
126 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
127 buf_size, packet_size);
128 return AVERROR_INVALIDDATA;
132 /* av_log(NULL, AV_LOG_DEBUG, "packet_size=%d buf= 0x%X %X %X %X\n",
133 packet_size, buf[0], buf[1], buf[2], buf[3]); */
135 Decoder_Interface_Decode(s->decState, buf, data, 0);
136 *data_size = 160 * 2;
141 AVCodec ff_libopencore_amrnb_decoder = {
150 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
153 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
155 AMRContext *s = avctx->priv_data;
159 if (avctx->sample_rate != 8000) {
160 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
161 return AVERROR(ENOSYS);
164 if (avctx->channels != 1) {
165 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
166 return AVERROR(ENOSYS);
169 avctx->frame_size = 160;
170 avctx->coded_frame = avcodec_alloc_frame();
172 s->enstate=Encoder_Interface_init(0);
174 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
178 if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
179 av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
180 return AVERROR(ENOSYS);
186 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
188 AMRContext *s = avctx->priv_data;
190 Encoder_Interface_exit(s->enstate);
191 av_freep(&avctx->coded_frame);
195 static int amr_nb_encode_frame(AVCodecContext *avctx,
196 unsigned char *frame/*out*/,
197 int buf_size, void *data/*in*/)
199 AMRContext *s = avctx->priv_data;
202 if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
203 av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
204 return AVERROR(ENOSYS);
207 written = Encoder_Interface_Encode(s->enstate, s->enc_bitrate, data,
209 /* av_log(NULL, AV_LOG_DEBUG, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
210 written, s->enc_bitrate, frame[0] ); */
215 AVCodec ff_libopencore_amrnb_encoder = {
224 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
225 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
230 /* -----------AMR wideband ------------*/
231 #if CONFIG_LIBOPENCORE_AMRWB
233 #include <opencore-amrwb/dec_if.h>
234 #include <opencore-amrwb/if_rom.h>
236 typedef struct AMRWBContext {
240 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
242 AMRWBContext *s = avctx->priv_data;
244 s->state = D_IF_init();
246 amr_decode_fix_avctx(avctx);
248 if (avctx->channels > 1) {
249 av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
250 return AVERROR(ENOSYS);
256 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
257 int *data_size, AVPacket *avpkt)
259 const uint8_t *buf = avpkt->data;
260 int buf_size = avpkt->size;
261 AMRWBContext *s = avctx->priv_data;
264 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
270 mode = (buf[0] >> 3) & 0x000F;
271 packet_size = block_size[mode];
273 if (packet_size > buf_size) {
274 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
275 buf_size, packet_size + 1);
276 return AVERROR_INVALIDDATA;
279 D_IF_decode(s->state, buf, data, _good_frame);
280 *data_size = 320 * 2;
284 static int amr_wb_decode_close(AVCodecContext *avctx)
286 AMRWBContext *s = avctx->priv_data;
292 AVCodec ff_libopencore_amrwb_decoder = {
296 sizeof(AMRWBContext),
301 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
304 #endif /* CONFIG_LIBOPENCORE_AMRWB */