Libav 0.7.1
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00001 /* 00002 * AMR Audio decoder stub 00003 * Copyright (c) 2003 the ffmpeg project 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "avcodec.h" 00023 #include "libavutil/avstring.h" 00024 #include "libavutil/opt.h" 00025 00026 static void amr_decode_fix_avctx(AVCodecContext *avctx) 00027 { 00028 const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB); 00029 00030 if (!avctx->sample_rate) 00031 avctx->sample_rate = 8000 * is_amr_wb; 00032 00033 if (!avctx->channels) 00034 avctx->channels = 1; 00035 00036 avctx->frame_size = 160 * is_amr_wb; 00037 avctx->sample_fmt = AV_SAMPLE_FMT_S16; 00038 } 00039 00040 #if CONFIG_LIBOPENCORE_AMRNB 00041 00042 #include <opencore-amrnb/interf_dec.h> 00043 #include <opencore-amrnb/interf_enc.h> 00044 00045 /* Common code for fixed and float version*/ 00046 typedef struct AMR_bitrates { 00047 int rate; 00048 enum Mode mode; 00049 } AMR_bitrates; 00050 00051 /* Match desired bitrate */ 00052 static int get_bitrate_mode(int bitrate, void *log_ctx) 00053 { 00054 /* make the correspondance between bitrate and mode */ 00055 static const AMR_bitrates rates[] = { 00056 { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 }, 00057 { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 } 00058 }; 00059 int i, best = -1, min_diff = 0; 00060 char log_buf[200]; 00061 00062 for (i = 0; i < 8; i++) { 00063 if (rates[i].rate == bitrate) 00064 return rates[i].mode; 00065 if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) { 00066 best = i; 00067 min_diff = abs(rates[i].rate - bitrate); 00068 } 00069 } 00070 /* no bitrate matching exactly, log a warning */ 00071 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of "); 00072 for (i = 0; i < 8; i++) 00073 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f); 00074 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f); 00075 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf); 00076 00077 return best; 00078 } 00079 00080 typedef struct AMRContext { 00081 AVClass *av_class; 00082 int frame_count; 00083 void *dec_state; 00084 void *enc_state; 00085 int enc_bitrate; 00086 int enc_mode; 00087 int enc_dtx; 00088 } AMRContext; 00089 00090 static const AVOption options[] = { 00091 { "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 }, 00092 { NULL } 00093 }; 00094 00095 static const AVClass class = { 00096 "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT 00097 }; 00098 00099 static av_cold int amr_nb_decode_init(AVCodecContext *avctx) 00100 { 00101 AMRContext *s = avctx->priv_data; 00102 00103 s->frame_count = 0; 00104 s->dec_state = Decoder_Interface_init(); 00105 if (!s->dec_state) { 00106 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n"); 00107 return -1; 00108 } 00109 00110 amr_decode_fix_avctx(avctx); 00111 00112 if (avctx->channels > 1) { 00113 av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n"); 00114 return AVERROR(ENOSYS); 00115 } 00116 00117 return 0; 00118 } 00119 00120 static av_cold int amr_nb_decode_close(AVCodecContext *avctx) 00121 { 00122 AMRContext *s = avctx->priv_data; 00123 00124 Decoder_Interface_exit(s->dec_state); 00125 return 0; 00126 } 00127 00128 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data, 00129 int *data_size, AVPacket *avpkt) 00130 { 00131 const uint8_t *buf = avpkt->data; 00132 int buf_size = avpkt->size; 00133 AMRContext *s = avctx->priv_data; 00134 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 }; 00135 enum Mode dec_mode; 00136 int packet_size; 00137 00138 av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n", 00139 buf, buf_size, s->frame_count); 00140 00141 dec_mode = (buf[0] >> 3) & 0x000F; 00142 packet_size = block_size[dec_mode] + 1; 00143 00144 if (packet_size > buf_size) { 00145 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", 00146 buf_size, packet_size); 00147 return AVERROR_INVALIDDATA; 00148 } 00149 00150 s->frame_count++; 00151 av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n", 00152 packet_size, buf[0], buf[1], buf[2], buf[3]); 00153 /* call decoder */ 00154 Decoder_Interface_Decode(s->dec_state, buf, data, 0); 00155 *data_size = 160 * 2; 00156 00157 return packet_size; 00158 } 00159 00160 AVCodec ff_libopencore_amrnb_decoder = { 00161 "libopencore_amrnb", 00162 AVMEDIA_TYPE_AUDIO, 00163 CODEC_ID_AMR_NB, 00164 sizeof(AMRContext), 00165 amr_nb_decode_init, 00166 NULL, 00167 amr_nb_decode_close, 00168 amr_nb_decode_frame, 00169 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"), 00170 }; 00171 00172 static av_cold int amr_nb_encode_init(AVCodecContext *avctx) 00173 { 00174 AMRContext *s = avctx->priv_data; 00175 00176 s->frame_count = 0; 00177 00178 if (avctx->sample_rate != 8000) { 00179 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n"); 00180 return AVERROR(ENOSYS); 00181 } 00182 00183 if (avctx->channels != 1) { 00184 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); 00185 return AVERROR(ENOSYS); 00186 } 00187 00188 avctx->frame_size = 160; 00189 avctx->coded_frame = avcodec_alloc_frame(); 00190 00191 s->enc_state = Encoder_Interface_init(s->enc_dtx); 00192 if (!s->enc_state) { 00193 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n"); 00194 return -1; 00195 } 00196 00197 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx); 00198 s->enc_bitrate = avctx->bit_rate; 00199 00200 return 0; 00201 } 00202 00203 static av_cold int amr_nb_encode_close(AVCodecContext *avctx) 00204 { 00205 AMRContext *s = avctx->priv_data; 00206 00207 Encoder_Interface_exit(s->enc_state); 00208 av_freep(&avctx->coded_frame); 00209 return 0; 00210 } 00211 00212 static int amr_nb_encode_frame(AVCodecContext *avctx, 00213 unsigned char *frame/*out*/, 00214 int buf_size, void *data/*in*/) 00215 { 00216 AMRContext *s = avctx->priv_data; 00217 int written; 00218 00219 if (s->enc_bitrate != avctx->bit_rate) { 00220 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx); 00221 s->enc_bitrate = avctx->bit_rate; 00222 } 00223 00224 written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, data, 00225 frame, 0); 00226 av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n", 00227 written, s->enc_mode, frame[0]); 00228 00229 return written; 00230 } 00231 00232 AVCodec ff_libopencore_amrnb_encoder = { 00233 "libopencore_amrnb", 00234 AVMEDIA_TYPE_AUDIO, 00235 CODEC_ID_AMR_NB, 00236 sizeof(AMRContext), 00237 amr_nb_encode_init, 00238 amr_nb_encode_frame, 00239 amr_nb_encode_close, 00240 NULL, 00241 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE}, 00242 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"), 00243 .priv_class = &class, 00244 }; 00245 00246 #endif 00247 00248 /* -----------AMR wideband ------------*/ 00249 #if CONFIG_LIBOPENCORE_AMRWB 00250 00251 #include <opencore-amrwb/dec_if.h> 00252 #include <opencore-amrwb/if_rom.h> 00253 00254 typedef struct AMRWBContext { 00255 void *state; 00256 } AMRWBContext; 00257 00258 static av_cold int amr_wb_decode_init(AVCodecContext *avctx) 00259 { 00260 AMRWBContext *s = avctx->priv_data; 00261 00262 s->state = D_IF_init(); 00263 00264 amr_decode_fix_avctx(avctx); 00265 00266 if (avctx->channels > 1) { 00267 av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n"); 00268 return AVERROR(ENOSYS); 00269 } 00270 00271 return 0; 00272 } 00273 00274 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data, 00275 int *data_size, AVPacket *avpkt) 00276 { 00277 const uint8_t *buf = avpkt->data; 00278 int buf_size = avpkt->size; 00279 AMRWBContext *s = avctx->priv_data; 00280 int mode; 00281 int packet_size; 00282 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1}; 00283 00284 if (!buf_size) 00285 /* nothing to do */ 00286 return 0; 00287 00288 mode = (buf[0] >> 3) & 0x000F; 00289 packet_size = block_size[mode]; 00290 00291 if (packet_size > buf_size) { 00292 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", 00293 buf_size, packet_size + 1); 00294 return AVERROR_INVALIDDATA; 00295 } 00296 00297 D_IF_decode(s->state, buf, data, _good_frame); 00298 *data_size = 320 * 2; 00299 return packet_size; 00300 } 00301 00302 static int amr_wb_decode_close(AVCodecContext *avctx) 00303 { 00304 AMRWBContext *s = avctx->priv_data; 00305 00306 D_IF_exit(s->state); 00307 return 0; 00308 } 00309 00310 AVCodec ff_libopencore_amrwb_decoder = { 00311 "libopencore_amrwb", 00312 AVMEDIA_TYPE_AUDIO, 00313 CODEC_ID_AMR_WB, 00314 sizeof(AMRWBContext), 00315 amr_wb_decode_init, 00316 NULL, 00317 amr_wb_decode_close, 00318 amr_wb_decode_frame, 00319 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"), 00320 }; 00321 00322 #endif /* CONFIG_LIBOPENCORE_AMRWB */