libavcodec/libopencore-amr.c
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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 "internal.h"
00024 #include "libavutil/avstring.h"
00025 #include "libavutil/opt.h"
00026 
00027 static void amr_decode_fix_avctx(AVCodecContext *avctx)
00028 {
00029     const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
00030 
00031     if (!avctx->sample_rate)
00032         avctx->sample_rate = 8000 * is_amr_wb;
00033 
00034     if (!avctx->channels)
00035         avctx->channels = 1;
00036 
00037     avctx->frame_size = 160 * is_amr_wb;
00038     avctx->sample_fmt = AV_SAMPLE_FMT_S16;
00039 }
00040 
00041 #if CONFIG_LIBOPENCORE_AMRNB
00042 
00043 #include <opencore-amrnb/interf_dec.h>
00044 #include <opencore-amrnb/interf_enc.h>
00045 
00046 /* Common code for fixed and float version*/
00047 typedef struct AMR_bitrates {
00048     int       rate;
00049     enum Mode mode;
00050 } AMR_bitrates;
00051 
00052 /* Match desired bitrate */
00053 static int get_bitrate_mode(int bitrate, void *log_ctx)
00054 {
00055     /* make the correspondance between bitrate and mode */
00056     static const AMR_bitrates rates[] = {
00057         { 4750, MR475 }, { 5150, MR515 }, {  5900, MR59  }, {  6700, MR67  },
00058         { 7400, MR74 },  { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
00059     };
00060     int i, best = -1, min_diff = 0;
00061     char log_buf[200];
00062 
00063     for (i = 0; i < 8; i++) {
00064         if (rates[i].rate == bitrate)
00065             return rates[i].mode;
00066         if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
00067             best     = i;
00068             min_diff = abs(rates[i].rate - bitrate);
00069         }
00070     }
00071     /* no bitrate matching exactly, log a warning */
00072     snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
00073     for (i = 0; i < 8; i++)
00074         av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate    / 1000.f);
00075     av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
00076     av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
00077 
00078     return best;
00079 }
00080 
00081 typedef struct AMRContext {
00082     AVClass *av_class;
00083     AVFrame frame;
00084     void *dec_state;
00085     void *enc_state;
00086     int   enc_bitrate;
00087     int   enc_mode;
00088     int   enc_dtx;
00089 } AMRContext;
00090 
00091 static const AVOption options[] = {
00092     { "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 },
00093     { NULL }
00094 };
00095 
00096 static const AVClass class = {
00097     "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
00098 };
00099 
00100 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
00101 {
00102     AMRContext *s  = avctx->priv_data;
00103 
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     avcodec_get_frame_defaults(&s->frame);
00118     avctx->coded_frame = &s->frame;
00119 
00120     return 0;
00121 }
00122 
00123 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
00124 {
00125     AMRContext *s = avctx->priv_data;
00126 
00127     Decoder_Interface_exit(s->dec_state);
00128 
00129     return 0;
00130 }
00131 
00132 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
00133                                int *got_frame_ptr, AVPacket *avpkt)
00134 {
00135     const uint8_t *buf = avpkt->data;
00136     int buf_size       = avpkt->size;
00137     AMRContext *s      = avctx->priv_data;
00138     static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
00139     enum Mode dec_mode;
00140     int packet_size, ret;
00141 
00142     av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
00143             buf, buf_size, avctx->frame_number);
00144 
00145     /* get output buffer */
00146     s->frame.nb_samples = 160;
00147     if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {
00148         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00149         return ret;
00150     }
00151 
00152     dec_mode    = (buf[0] >> 3) & 0x000F;
00153     packet_size = block_size[dec_mode] + 1;
00154 
00155     if (packet_size > buf_size) {
00156         av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
00157                buf_size, packet_size);
00158         return AVERROR_INVALIDDATA;
00159     }
00160 
00161     av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
00162               packet_size, buf[0], buf[1], buf[2], buf[3]);
00163     /* call decoder */
00164     Decoder_Interface_Decode(s->dec_state, buf, (short *)s->frame.data[0], 0);
00165 
00166     *got_frame_ptr   = 1;
00167     *(AVFrame *)data = s->frame;
00168 
00169     return packet_size;
00170 }
00171 
00172 AVCodec ff_libopencore_amrnb_decoder = {
00173     .name           = "libopencore_amrnb",
00174     .type           = AVMEDIA_TYPE_AUDIO,
00175     .id             = CODEC_ID_AMR_NB,
00176     .priv_data_size = sizeof(AMRContext),
00177     .init           = amr_nb_decode_init,
00178     .close          = amr_nb_decode_close,
00179     .decode         = amr_nb_decode_frame,
00180     .capabilities   = CODEC_CAP_DR1,
00181     .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
00182 };
00183 
00184 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
00185 {
00186     AMRContext *s = avctx->priv_data;
00187 
00188     if (avctx->sample_rate != 8000) {
00189         av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
00190         return AVERROR(ENOSYS);
00191     }
00192 
00193     if (avctx->channels != 1) {
00194         av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
00195         return AVERROR(ENOSYS);
00196     }
00197 
00198     avctx->frame_size  = 160;
00199     avctx->coded_frame = avcodec_alloc_frame();
00200 
00201     s->enc_state = Encoder_Interface_init(s->enc_dtx);
00202     if (!s->enc_state) {
00203         av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
00204         return -1;
00205     }
00206 
00207     s->enc_mode    = get_bitrate_mode(avctx->bit_rate, avctx);
00208     s->enc_bitrate = avctx->bit_rate;
00209 
00210     return 0;
00211 }
00212 
00213 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
00214 {
00215     AMRContext *s = avctx->priv_data;
00216 
00217     Encoder_Interface_exit(s->enc_state);
00218     av_freep(&avctx->coded_frame);
00219     return 0;
00220 }
00221 
00222 static int amr_nb_encode_frame(AVCodecContext *avctx,
00223                                unsigned char *frame/*out*/,
00224                                int buf_size, void *data/*in*/)
00225 {
00226     AMRContext *s = avctx->priv_data;
00227     int written;
00228 
00229     if (s->enc_bitrate != avctx->bit_rate) {
00230         s->enc_mode    = get_bitrate_mode(avctx->bit_rate, avctx);
00231         s->enc_bitrate = avctx->bit_rate;
00232     }
00233 
00234     written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, data,
00235                                        frame, 0);
00236     av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
00237             written, s->enc_mode, frame[0]);
00238 
00239     return written;
00240 }
00241 
00242 AVCodec ff_libopencore_amrnb_encoder = {
00243     .name           = "libopencore_amrnb",
00244     .type           = AVMEDIA_TYPE_AUDIO,
00245     .id             = CODEC_ID_AMR_NB,
00246     .priv_data_size = sizeof(AMRContext),
00247     .init           = amr_nb_encode_init,
00248     .encode         = amr_nb_encode_frame,
00249     .close          = amr_nb_encode_close,
00250     .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
00251     .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
00252     .priv_class = &class,
00253 };
00254 
00255 #endif
00256 
00257 /* -----------AMR wideband ------------*/
00258 #if CONFIG_LIBOPENCORE_AMRWB
00259 
00260 #include <opencore-amrwb/dec_if.h>
00261 #include <opencore-amrwb/if_rom.h>
00262 
00263 typedef struct AMRWBContext {
00264     AVFrame frame;
00265     void  *state;
00266 } AMRWBContext;
00267 
00268 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
00269 {
00270     AMRWBContext *s = avctx->priv_data;
00271 
00272     s->state        = D_IF_init();
00273 
00274     amr_decode_fix_avctx(avctx);
00275 
00276     if (avctx->channels > 1) {
00277         av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
00278         return AVERROR(ENOSYS);
00279     }
00280 
00281     avcodec_get_frame_defaults(&s->frame);
00282     avctx->coded_frame = &s->frame;
00283 
00284     return 0;
00285 }
00286 
00287 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
00288                                int *got_frame_ptr, AVPacket *avpkt)
00289 {
00290     const uint8_t *buf = avpkt->data;
00291     int buf_size       = avpkt->size;
00292     AMRWBContext *s    = avctx->priv_data;
00293     int mode, ret;
00294     int packet_size;
00295     static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
00296 
00297     /* get output buffer */
00298     s->frame.nb_samples = 320;
00299     if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {
00300         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00301         return ret;
00302     }
00303 
00304     mode        = (buf[0] >> 3) & 0x000F;
00305     packet_size = block_size[mode];
00306 
00307     if (packet_size > buf_size) {
00308         av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
00309                buf_size, packet_size + 1);
00310         return AVERROR_INVALIDDATA;
00311     }
00312 
00313     D_IF_decode(s->state, buf, (short *)s->frame.data[0], _good_frame);
00314 
00315     *got_frame_ptr   = 1;
00316     *(AVFrame *)data = s->frame;
00317 
00318     return packet_size;
00319 }
00320 
00321 static int amr_wb_decode_close(AVCodecContext *avctx)
00322 {
00323     AMRWBContext *s = avctx->priv_data;
00324 
00325     D_IF_exit(s->state);
00326     return 0;
00327 }
00328 
00329 AVCodec ff_libopencore_amrwb_decoder = {
00330     .name           = "libopencore_amrwb",
00331     .type           = AVMEDIA_TYPE_AUDIO,
00332     .id             = CODEC_ID_AMR_WB,
00333     .priv_data_size = sizeof(AMRWBContext),
00334     .init           = amr_wb_decode_init,
00335     .close          = amr_wb_decode_close,
00336     .decode         = amr_wb_decode_frame,
00337     .capabilities   = CODEC_CAP_DR1,
00338     .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
00339 };
00340 
00341 #endif /* CONFIG_LIBOPENCORE_AMRWB */