--- /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,
+};
projects / synfig.git / blobdiff