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