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461 lines
12 KiB
C
461 lines
12 KiB
C
/*
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* AMR Audio decoder stub
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* Copyright (c) 2003 the ffmpeg project
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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This code implements amr-nb audio encoder/decoder through external reference
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code from www.3gpp.org. The licence of the code from 3gpp is unclear so you
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have to download the code separately. Two versions exists: One fixed-point
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and one with floats. For some reason the float-encoder is significant faster
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atleast on a P4 1.5GHz (0.9s instead of 9.9s on a 30s audio clip at MR102).
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The fixed-point (TS26.073) can be downloaded from:
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http://www.3gpp.org/ftp/Specs/latest/Rel-5/26_series/26073-510.zip
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Extract the soure into ffmpeg/libavcodec/amr
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To use the float version run "./configure" with "--enable-amr-nb-fixed"
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The float version (default) can be downloaded from:
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http://www.3gpp.org/ftp/Specs/latest/Rel-5/26_series/26104-510.zip
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Extract the soure into ffmpeg/libavcodec/amr_float
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The specification for amr-nb can be found in TS 26.071
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(http://www.3gpp.org/ftp/Specs/html-info/26071.htm) and some other
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info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm
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In the future support for AMR-WB might also be included here.
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Reference code exist in TS26.173 and TS 26.204.
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*/
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#define DEBUG
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//#define AMR_NB_FIXED
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#include "../config.h"
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#include "avcodec.h"
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#ifdef AMR_NB_FIXED
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#define MMS_IO
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#include "amr/sp_dec.h"
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#include "amr/d_homing.h"
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#include "amr/typedef.h"
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#include "amr/sp_enc.h"
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#include "amr/sid_sync.h"
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#include "amr/e_homing.h"
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#else
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#include "amr_float/interf_dec.h"
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#include "amr_float/interf_enc.h"
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#endif
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/* Common code for fixed and float version*/
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typedef struct AMR_bitrates
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{
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int startrate;
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int stoprate;
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enum Mode mode;
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} AMR_bitrates;
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/* Match desired bitrate with closest one*/
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static enum Mode getBitrateMode(int bitrate)
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{
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/* Adjusted so that all bitrates can be used from commandline where
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only a multiple of 1000 can be specified*/
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AMR_bitrates rates[]={ {0,4999,MR475}, //4
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{5000,5899,MR515},//5
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{5900,6699,MR59},//6
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{6700,7000,MR67},//7
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{7001,7949,MR74},//8
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{7950,9999,MR795},//9
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{10000,11999,MR102},//10
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{12000,64000,MR122},//12
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};
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int i;
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for(i=0;i<sizeof(rates);i++)
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{
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if(rates[i].startrate<=bitrate && rates[i].stoprate>=bitrate)
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{
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return(rates[i].mode);
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}
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}
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/*Return highest possible*/
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return(MR122);
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}
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#ifdef AMR_NB_FIXED
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/* fixed point version*/
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/* frame size in serial bitstream file (frame type + serial stream + flags) */
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#define SERIAL_FRAMESIZE (1+MAX_SERIAL_SIZE+5)
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typedef struct AMRContext {
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int frameCount;
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Speech_Decode_FrameState *speech_decoder_state;
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enum RXFrameType rx_type;
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enum Mode mode;
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Word16 reset_flag;
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Word16 reset_flag_old;
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enum Mode enc_bitrate;
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Speech_Encode_FrameState *enstate;
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sid_syncState *sidstate;
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enum TXFrameType tx_frametype;
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} AMRContext;
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static int amr_nb_decode_init(AVCodecContext * avctx)
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{
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AMRContext *s = avctx->priv_data;
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s->frameCount=0;
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s->speech_decoder_state=NULL;
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s->rx_type = (enum RXFrameType)0;
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s->mode= (enum Mode)0;
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s->reset_flag=0;
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s->reset_flag_old=1;
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if(Speech_Decode_Frame_init(&s->speech_decoder_state, "Decoder"))
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{
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printf("Speech_Decode_Frame_init error\n");
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return -1;
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}
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return 0;
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}
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static int amr_nb_encode_init(AVCodecContext * avctx)
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{
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AMRContext *s = avctx->priv_data;
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s->frameCount=0;
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s->speech_decoder_state=NULL;
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s->rx_type = (enum RXFrameType)0;
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s->mode= (enum Mode)0;
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s->reset_flag=0;
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s->reset_flag_old=1;
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if(avctx->sample_rate!=8000)
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{
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#ifdef DEBUG
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printf("Only 8000Hz sample rate supported\n");
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#endif
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return -1;
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}
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if(avctx->channels!=1)
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{
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#ifdef DEBUG
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printf("Only mono supported\n");
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#endif
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return -1;
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}
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avctx->frame_size=160;
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avctx->coded_frame= avcodec_alloc_frame();
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if(Speech_Encode_Frame_init(&s->enstate, 0, "encoder") || sid_sync_init (&s->sidstate))
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{
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#ifdef DEBUG
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printf("Speech_Encode_Frame_init error\n");
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#endif
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return -1;
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}
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s->enc_bitrate=getBitrateMode(avctx->bit_rate);
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return 0;
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}
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static int amr_nb_encode_close(AVCodecContext * avctx)
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{
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AMRContext *s = avctx->priv_data;
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Speech_Encode_Frame_exit(&s->enstate);
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sid_sync_exit (&s->sidstate);
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av_freep(&avctx->coded_frame);
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return 0;
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}
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static int amr_nb_decode_close(AVCodecContext * avctx)
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{
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AMRContext *s = avctx->priv_data;
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Speech_Decode_Frame_exit(&s->speech_decoder_state);
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return 0;
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}
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static int amr_nb_decode_frame(AVCodecContext * avctx,
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void *data, int *data_size,
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uint8_t * buf, int buf_size)
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{
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AMRContext *s = avctx->priv_data;
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uint8_t*amrData=buf;
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int offset=0;
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UWord8 toc, q, ft;
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Word16 serial[SERIAL_FRAMESIZE]; /* coded bits */
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Word16 *synth;
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UWord8 *packed_bits;
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*data_size=0;
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static Word16 packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
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int i;
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//printf("amr_decode_frame data_size=%i buf=0x%X buf_size=%d frameCount=%d!!\n",*data_size,buf,buf_size,s->frameCount);
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synth=data;
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// while(offset<buf_size)
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{
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toc=amrData[offset];
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/* read rest of the frame based on ToC byte */
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q = (toc >> 2) & 0x01;
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ft = (toc >> 3) & 0x0F;
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//printf("offset=%d, packet_size=%d amrData= 0x%X %X %X %X\n",offset,packed_size[ft],amrData[offset],amrData[offset+1],amrData[offset+2],amrData[offset+3]);
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offset++;
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packed_bits=amrData+offset;
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offset+=packed_size[ft];
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//Unsort and unpack bits
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s->rx_type = UnpackBits(q, ft, packed_bits, &s->mode, &serial[1]);
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//We have a new frame
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s->frameCount++;
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if (s->rx_type == RX_NO_DATA)
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{
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s->mode = s->speech_decoder_state->prev_mode;
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}
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else {
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s->speech_decoder_state->prev_mode = s->mode;
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}
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/* if homed: check if this frame is another homing frame */
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if (s->reset_flag_old == 1)
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{
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/* only check until end of first subframe */
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s->reset_flag = decoder_homing_frame_test_first(&serial[1], s->mode);
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}
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/* produce encoder homing frame if homed & input=decoder homing frame */
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if ((s->reset_flag != 0) && (s->reset_flag_old != 0))
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{
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for (i = 0; i < L_FRAME; i++)
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{
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synth[i] = EHF_MASK;
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}
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}
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else
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{
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/* decode frame */
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Speech_Decode_Frame(s->speech_decoder_state, s->mode, &serial[1], s->rx_type, synth);
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}
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//Each AMR-frame results in 160 16-bit samples
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*data_size+=160*2;
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synth+=160;
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/* if not homed: check whether current frame is a homing frame */
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if (s->reset_flag_old == 0)
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{
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/* check whole frame */
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s->reset_flag = decoder_homing_frame_test(&serial[1], s->mode);
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}
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/* reset decoder if current frame is a homing frame */
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if (s->reset_flag != 0)
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{
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Speech_Decode_Frame_reset(s->speech_decoder_state);
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}
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s->reset_flag_old = s->reset_flag;
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}
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return offset;
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}
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static int amr_nb_encode_frame(AVCodecContext *avctx,
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unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
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{
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short serial_data[250] = {0};
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AMRContext *s = avctx->priv_data;
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int written;
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s->reset_flag = encoder_homing_frame_test(data);
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Speech_Encode_Frame(s->enstate, s->enc_bitrate, data, &serial_data[1], &s->mode);
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/* add frame type and mode */
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sid_sync (s->sidstate, s->mode, &s->tx_frametype);
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written = PackBits(s->mode, s->enc_bitrate, s->tx_frametype, &serial_data[1], frame);
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if (s->reset_flag != 0)
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{
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Speech_Encode_Frame_reset(s->enstate);
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sid_sync_reset(s->sidstate);
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}
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return written;
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}
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#else /* Float point version*/
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typedef struct AMRContext {
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int frameCount;
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void * decState;
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int *enstate;
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enum Mode enc_bitrate;
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} AMRContext;
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static int amr_nb_decode_init(AVCodecContext * avctx)
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{
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AMRContext *s = avctx->priv_data;
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s->frameCount=0;
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s->decState=Decoder_Interface_init();
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if(!s->decState)
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{
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printf("Decoder_Interface_init error\r\n");
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return -1;
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}
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return 0;
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}
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static int amr_nb_encode_init(AVCodecContext * avctx)
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{
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AMRContext *s = avctx->priv_data;
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s->frameCount=0;
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if(avctx->sample_rate!=8000)
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{
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#ifdef DEBUG
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printf("Only 8000Hz sample rate supported\n");
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#endif
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return -1;
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}
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if(avctx->channels!=1)
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{
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#ifdef DEBUG
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printf("Only mono supported\n");
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#endif
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return -1;
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}
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avctx->frame_size=160;
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avctx->coded_frame= avcodec_alloc_frame();
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s->enstate=Encoder_Interface_init(0);
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if(!s->enstate)
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{
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printf("Encoder_Interface_init error\n");
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return -1;
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}
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s->enc_bitrate=getBitrateMode(avctx->bit_rate);
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return 0;
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}
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static int amr_nb_decode_close(AVCodecContext * avctx)
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{
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AMRContext *s = avctx->priv_data;
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Decoder_Interface_exit(s->decState);
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return 0;
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}
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static int amr_nb_encode_close(AVCodecContext * avctx)
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{
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AMRContext *s = avctx->priv_data;
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Encoder_Interface_exit(s->enstate);
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av_freep(&avctx->coded_frame);
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return 0;
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}
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static int amr_nb_decode_frame(AVCodecContext * avctx,
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void *data, int *data_size,
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uint8_t * buf, int buf_size)
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{
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AMRContext *s = (AMRContext*)avctx->priv_data;
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uint8_t*amrData=buf;
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int offset=0;
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static short block_size[16]={ 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
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enum Mode dec_mode;
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int packet_size;
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*data_size=0;
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//printf("amr_decode_frame data_size=%i buf=0x%X buf_size=%d frameCount=%d!!\n",*data_size,buf,buf_size,s->frameCount);
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while(offset<buf_size)
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{
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dec_mode = (amrData[offset] >> 3) & 0x000F;
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packet_size = block_size[dec_mode];
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s->frameCount++;
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//printf("offset=%d, packet_size=%d amrData= 0x%X %X %X %X\n",offset,packet_size,amrData[offset],amrData[offset+1],amrData[offset+2],amrData[offset+3]);
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/* call decoder */
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Decoder_Interface_Decode(s->decState, &amrData[offset], data+*data_size, 0);
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*data_size+=160*2;
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offset+=packet_size+1;
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}
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return buf_size;
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}
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static int amr_nb_encode_frame(AVCodecContext *avctx,
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unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
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{
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AMRContext *s = (AMRContext*)avctx->priv_data;
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int written;
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written = Encoder_Interface_Encode(s->enstate,
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s->enc_bitrate,
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data,
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frame,
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0);
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return written;
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}
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#endif
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AVCodec amr_nb_decoder =
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{
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"amr_nb",
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CODEC_TYPE_AUDIO,
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CODEC_ID_AMR_NB,
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sizeof(AMRContext),
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amr_nb_decode_init,
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NULL,
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amr_nb_decode_close,
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amr_nb_decode_frame,
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};
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AVCodec amr_nb_encoder =
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{
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"amr_nb",
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CODEC_TYPE_AUDIO,
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CODEC_ID_AMR_NB,
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sizeof(AMRContext),
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amr_nb_encode_init,
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amr_nb_encode_frame,
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amr_nb_encode_close,
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NULL,
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};
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