libavcodec/libopencore-amr.c - vendor/opensource/ffmpeg - Git at Google

 /*
  * AMR Audio decoder stub
  * Copyright (c) 2003 the ffmpeg project
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg 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 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg 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 FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 #include "avcodec.h"

 static void amr_decode_fix_avctx(AVCodecContext *avctx)
 {
     const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);

     if (!avctx->sample_rate)
         avctx->sample_rate = 8000 * is_amr_wb;

     if (!avctx->channels)
         avctx->channels = 1;

     avctx->frame_size = 160 * is_amr_wb;
     avctx->sample_fmt = SAMPLE_FMT_S16;
 }

 #if CONFIG_LIBOPENCORE_AMRNB

 #include <opencore-amrnb/interf_dec.h>
 #include <opencore-amrnb/interf_enc.h>

 static const char nb_bitrate_unsupported[] =
     "bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k\n";

 /* Common code for fixed and float version*/
 typedef struct AMR_bitrates {
     int       rate;
     enum Mode mode;
 } AMR_bitrates;

 /* Match desired bitrate */
 static int getBitrateMode(int bitrate)
 {
     /* make the correspondance between bitrate and mode */
     AMR_bitrates rates[] = { { 4750, MR475},
                              { 5150, MR515},
                              { 5900, MR59},
                              { 6700, MR67},
                              { 7400, MR74},
                              { 7950, MR795},
                              {10200, MR102},
                              {12200, MR122}, };
     int i;

     for (i = 0; i < 8; i++)
         if (rates[i].rate == bitrate)
             return rates[i].mode;
     /* no bitrate matching, return an error */
     return -1;
 }

 typedef struct AMRContext {
     int   frameCount;
     void *decState;
     int  *enstate;
     int   enc_bitrate;
 } AMRContext;

 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
 {
     AMRContext *s = avctx->priv_data;

     s->frameCount = 0;
     s->decState   = Decoder_Interface_init();
     if (!s->decState) {
         av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\r\n");
         return -1;
     }

     amr_decode_fix_avctx(avctx);

     if (avctx->channels > 1) {
         av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
         return -1;
     }

     return 0;
 }

 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
 {
     AMRContext *s = avctx->priv_data;

     Decoder_Interface_exit(s->decState);
     return 0;
 }

 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
                                int *data_size,
                                const uint8_t *buf, int buf_size)
 {
     AMRContext *s = avctx->priv_data;
     const uint8_t *amrData = buf;
     static const uint8_t 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;

     /* av_log(NULL, AV_LOG_DEBUG, "amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",
               buf, buf_size, s->frameCount); */

     dec_mode = (buf[0] >> 3) & 0x000F;
     packet_size = block_size[dec_mode] + 1;

     if (packet_size > buf_size) {
         av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
                buf_size, packet_size);
         return -1;
     }

     s->frameCount++;
     /* av_log(NULL, AV_LOG_DEBUG, "packet_size=%d amrData= 0x%X %X %X %X\n",
               packet_size, amrData[0], amrData[1], amrData[2], amrData[3]); */
     /* call decoder */
     Decoder_Interface_Decode(s->decState, amrData, data, 0);
     *data_size = 160 * 2;

     return packet_size;
 }

 AVCodec libopencore_amrnb_decoder = {
     "libopencore_amrnb",
     CODEC_TYPE_AUDIO,
     CODEC_ID_AMR_NB,
     sizeof(AMRContext),
     amr_nb_decode_init,
     NULL,
     amr_nb_decode_close,
     amr_nb_decode_frame,
     .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
 };

 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
 {
     AMRContext *s = avctx->priv_data;

     s->frameCount = 0;

     if (avctx->sample_rate != 8000) {
         av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
         return -1;
     }

     if (avctx->channels != 1) {
         av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
         return -1;
     }

     avctx->frame_size  = 160;
     avctx->coded_frame = avcodec_alloc_frame();

     s->enstate=Encoder_Interface_init(0);
     if (!s->enstate) {
         av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
         return -1;
     }

     if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
         av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
         return -1;
     }

     return 0;
 }

 static av_cold 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_encode_frame(AVCodecContext *avctx,
                                unsigned char *frame/*out*/,
                                int buf_size, void *data/*in*/)
 {
     AMRContext *s = avctx->priv_data;
     int written;

     if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
         av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
         return -1;
     }

     written = Encoder_Interface_Encode(s->enstate, s->enc_bitrate, data,
                                        frame, 0);
     /* av_log(NULL, AV_LOG_DEBUG, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
               written, s->enc_bitrate, frame[0] ); */

     return written;
 }

 AVCodec libopencore_amrnb_encoder = {
     "libopencore_amrnb",
     CODEC_TYPE_AUDIO,
     CODEC_ID_AMR_NB,
     sizeof(AMRContext),
     amr_nb_encode_init,
     amr_nb_encode_frame,
     amr_nb_encode_close,
     NULL,
     .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
 };

 #endif

 /* -----------AMR wideband ------------*/
 #if CONFIG_LIBOPENCORE_AMRWB

 #ifdef _TYPEDEF_H
 //To avoid duplicate typedefs from typedef in amr-nb
 #define typedef_h
 #endif

 #include <opencore-amrwb/dec_if.h>
 #include <opencore-amrwb/if_rom.h>

 static const char wb_bitrate_unsupported[] =
     "bitrate not supported: use one of 6.6k, 8.85k, 12.65k, 14.25k, 15.85k, 18.25k, 19.85k, 23.05k, or 23.85k\n";

 /* Common code for fixed and float version*/
 typedef struct AMRWB_bitrates {
     int rate;
     int mode;
 } AMRWB_bitrates;

 typedef struct AMRWBContext {
     int    frameCount;
     void  *state;
     int    mode;
     Word16 allow_dtx;
 } AMRWBContext;

 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
 {
     AMRWBContext *s = avctx->priv_data;

     s->frameCount = 0;
     s->state      = D_IF_init();

     amr_decode_fix_avctx(avctx);

     if (avctx->channels > 1) {
         av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
         return -1;
     }

     return 0;
 }

 static int amr_wb_decode_frame(AVCodecContext *avctx,
                                void *data, int *data_size,
                                const uint8_t *buf, int buf_size)
 {
     AMRWBContext *s = avctx->priv_data;
     const uint8_t *amrData = buf;
     int mode;
     int packet_size;
     static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};

     if (!buf_size)
         /* nothing to do */
         return 0;

     mode = (amrData[0] >> 3) & 0x000F;
     packet_size = block_size[mode];

     if (packet_size > buf_size) {
         av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
                buf_size, packet_size + 1);
         return -1;
     }

     s->frameCount++;
     D_IF_decode(s->state, amrData, data, _good_frame);
     *data_size = 320 * 2;
     return packet_size;
 }

 static int amr_wb_decode_close(AVCodecContext *avctx)
 {
     AMRWBContext *s = avctx->priv_data;

     D_IF_exit(s->state);
     return 0;
 }

 AVCodec libopencore_amrwb_decoder = {
     "libopencore_amrwb",
     CODEC_TYPE_AUDIO,
     CODEC_ID_AMR_WB,
     sizeof(AMRWBContext),
     amr_wb_decode_init,
     NULL,
     amr_wb_decode_close,
     amr_wb_decode_frame,
     .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
 };

 #endif /* CONFIG_LIBOPENCORE_AMRWB */
	/*
	* AMR Audio decoder stub
	* Copyright (c) 2003 the ffmpeg project
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg 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 2.1 of the License, or (at your option) any later version.
	*
	* FFmpeg 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 FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include "avcodec.h"

	static void amr_decode_fix_avctx(AVCodecContext *avctx)
	{
	const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);

	if (!avctx->sample_rate)
	avctx->sample_rate = 8000 * is_amr_wb;

	if (!avctx->channels)
	avctx->channels = 1;

	avctx->frame_size = 160 * is_amr_wb;
	avctx->sample_fmt = SAMPLE_FMT_S16;
	}

	#if CONFIG_LIBOPENCORE_AMRNB

	#include <opencore-amrnb/interf_dec.h>
	#include <opencore-amrnb/interf_enc.h>

	static const char nb_bitrate_unsupported[] =
	"bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k\n";

	/* Common code for fixed and float version*/
	typedef struct AMR_bitrates {
	int rate;
	enum Mode mode;
	} AMR_bitrates;

	/* Match desired bitrate */
	static int getBitrateMode(int bitrate)
	{
	/* make the correspondance between bitrate and mode */
	AMR_bitrates rates[] = { { 4750, MR475},
	{ 5150, MR515},
	{ 5900, MR59},
	{ 6700, MR67},
	{ 7400, MR74},
	{ 7950, MR795},
	{10200, MR102},
	{12200, MR122}, };
	int i;

	for (i = 0; i < 8; i++)
	if (rates[i].rate == bitrate)
	return rates[i].mode;
	/* no bitrate matching, return an error */
	return -1;
	}

	typedef struct AMRContext {
	int frameCount;
	void *decState;
	int *enstate;
	int enc_bitrate;
	} AMRContext;

	static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
	{
	AMRContext *s = avctx->priv_data;

	s->frameCount = 0;
	s->decState = Decoder_Interface_init();
	if (!s->decState) {
	av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\r\n");
	return -1;
	}

	amr_decode_fix_avctx(avctx);

	if (avctx->channels > 1) {
	av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
	return -1;
	}

	return 0;
	}

	static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
	{
	AMRContext *s = avctx->priv_data;

	Decoder_Interface_exit(s->decState);
	return 0;
	}

	static int amr_nb_decode_frame(AVCodecContext avctx, void data,
	int *data_size,
	const uint8_t *buf, int buf_size)
	{
	AMRContext *s = avctx->priv_data;
	const uint8_t *amrData = buf;
	static const uint8_t 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;

	/* av_log(NULL, AV_LOG_DEBUG, "amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",
	buf, buf_size, s->frameCount); */

	dec_mode = (buf[0] >> 3) & 0x000F;
	packet_size = block_size[dec_mode] + 1;

	if (packet_size > buf_size) {
	av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
	buf_size, packet_size);
	return -1;
	}

	s->frameCount++;
	/* av_log(NULL, AV_LOG_DEBUG, "packet_size=%d amrData= 0x%X %X %X %X\n",
	packet_size, amrData[0], amrData[1], amrData[2], amrData[3]); */
	/* call decoder */
	Decoder_Interface_Decode(s->decState, amrData, data, 0);
	data_size = 160 2;

	return packet_size;
	}

	AVCodec libopencore_amrnb_decoder = {
	"libopencore_amrnb",
	CODEC_TYPE_AUDIO,
	CODEC_ID_AMR_NB,
	sizeof(AMRContext),
	amr_nb_decode_init,
	NULL,
	amr_nb_decode_close,
	amr_nb_decode_frame,
	.long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
	};

	static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
	{
	AMRContext *s = avctx->priv_data;

	s->frameCount = 0;

	if (avctx->sample_rate != 8000) {
	av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
	return -1;
	}

	if (avctx->channels != 1) {
	av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
	return -1;
	}

	avctx->frame_size = 160;
	avctx->coded_frame = avcodec_alloc_frame();

	s->enstate=Encoder_Interface_init(0);
	if (!s->enstate) {
	av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
	return -1;
	}

	if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
	av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
	return -1;
	}

	return 0;
	}

	static av_cold 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_encode_frame(AVCodecContext *avctx,
	unsigned char frame/out*/,
	int buf_size, void data/in*/)
	{
	AMRContext *s = avctx->priv_data;
	int written;

	if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
	av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
	return -1;
	}

	written = Encoder_Interface_Encode(s->enstate, s->enc_bitrate, data,
	frame, 0);
	/* av_log(NULL, AV_LOG_DEBUG, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
	written, s->enc_bitrate, frame[0] ); */

	return written;
	}

	AVCodec libopencore_amrnb_encoder = {
	"libopencore_amrnb",
	CODEC_TYPE_AUDIO,
	CODEC_ID_AMR_NB,
	sizeof(AMRContext),
	amr_nb_encode_init,
	amr_nb_encode_frame,
	amr_nb_encode_close,
	NULL,
	.sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
	.long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
	};

	#endif

	/* -----------AMR wideband ------------*/
	#if CONFIG_LIBOPENCORE_AMRWB

	#ifdef _TYPEDEF_H
	//To avoid duplicate typedefs from typedef in amr-nb
	#define typedef_h
	#endif

	#include <opencore-amrwb/dec_if.h>
	#include <opencore-amrwb/if_rom.h>

	static const char wb_bitrate_unsupported[] =
	"bitrate not supported: use one of 6.6k, 8.85k, 12.65k, 14.25k, 15.85k, 18.25k, 19.85k, 23.05k, or 23.85k\n";

	/* Common code for fixed and float version*/
	typedef struct AMRWB_bitrates {
	int rate;
	int mode;
	} AMRWB_bitrates;

	typedef struct AMRWBContext {
	int frameCount;
	void *state;
	int mode;
	Word16 allow_dtx;
	} AMRWBContext;

	static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
	{
	AMRWBContext *s = avctx->priv_data;

	s->frameCount = 0;
	s->state = D_IF_init();

	amr_decode_fix_avctx(avctx);

	if (avctx->channels > 1) {
	av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
	return -1;
	}

	return 0;
	}

	static int amr_wb_decode_frame(AVCodecContext *avctx,
	void data, int data_size,
	const uint8_t *buf, int buf_size)
	{
	AMRWBContext *s = avctx->priv_data;
	const uint8_t *amrData = buf;
	int mode;
	int packet_size;
	static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};

	if (!buf_size)
	/* nothing to do */
	return 0;

	mode = (amrData[0] >> 3) & 0x000F;
	packet_size = block_size[mode];

	if (packet_size > buf_size) {
	av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
	buf_size, packet_size + 1);
	return -1;
	}

	s->frameCount++;
	D_IF_decode(s->state, amrData, data, _good_frame);
	data_size = 320 2;
	return packet_size;
	}

	static int amr_wb_decode_close(AVCodecContext *avctx)
	{
	AMRWBContext *s = avctx->priv_data;

	D_IF_exit(s->state);
	return 0;
	}

	AVCodec libopencore_amrwb_decoder = {
	"libopencore_amrwb",
	CODEC_TYPE_AUDIO,
	CODEC_ID_AMR_WB,
	sizeof(AMRWBContext),
	amr_wb_decode_init,
	NULL,
	amr_wb_decode_close,
	amr_wb_decode_frame,
	.long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
	};

	#endif /* CONFIG_LIBOPENCORE_AMRWB */