libavcodec/libopencore-amr.c - third_party/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"
 #include "libavutil/avstring.h"
 #include "libavutil/opt.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 = AV_SAMPLE_FMT_S16;
 }

 #if CONFIG_LIBOPENCORE_AMRNB

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

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

 /* Match desired bitrate */
 static int get_bitrate_mode(int bitrate, void *log_ctx)
 {
     /* make the correspondance between bitrate and mode */
     static const AMR_bitrates rates[] = {
         { 4750, MR475 }, { 5150, MR515 }, {  5900, MR59  }, {  6700, MR67  },
         { 7400, MR74 },  { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
     };
     int i, best = -1, min_diff = 0;
     char log_buf[200];

     for (i = 0; i < 8; i++) {
         if (rates[i].rate == bitrate)
             return rates[i].mode;
         if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
             best     = i;
             min_diff = abs(rates[i].rate - bitrate);
         }
     }
     /* no bitrate matching exactly, log a warning */
     snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
     for (i = 0; i < 8; i++)
         av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate    / 1000.f);
     av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
     av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);

     return best;
 }

 typedef struct AMRContext {
     AVClass *av_class;
     AVFrame frame;
     void *dec_state;
     void *enc_state;
     int   enc_bitrate;
     int   enc_mode;
     int   enc_dtx;
 } AMRContext;

 static const AVOption options[] = {
     { "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 },
     { NULL }
 };

 static const AVClass class = {
     "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
 };

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

     s->dec_state   = Decoder_Interface_init();
     if (!s->dec_state) {
         av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\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 AVERROR(ENOSYS);
     }

     avcodec_get_frame_defaults(&s->frame);
     avctx->coded_frame = &s->frame;

     return 0;
 }

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

     Decoder_Interface_exit(s->dec_state);

     return 0;
 }

 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
                                int *got_frame_ptr, AVPacket *avpkt)
 {
     const uint8_t *buf = avpkt->data;
     int buf_size       = avpkt->size;
     AMRContext *s      = avctx->priv_data;
     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, ret;

     av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
             buf, buf_size, avctx->frame_number);

     /* get output buffer */
     s->frame.nb_samples = 160;
     if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return ret;
     }

     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 AVERROR_INVALIDDATA;
     }

     av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
               packet_size, buf[0], buf[1], buf[2], buf[3]);
     /* call decoder */
     Decoder_Interface_Decode(s->dec_state, buf, (short *)s->frame.data[0], 0);

     *got_frame_ptr   = 1;
     *(AVFrame *)data = s->frame;

     return packet_size;
 }

 AVCodec ff_libopencore_amrnb_decoder = {
     .name           = "libopencore_amrnb",
     .type           = AVMEDIA_TYPE_AUDIO,
     .id             = CODEC_ID_AMR_NB,
     .priv_data_size = sizeof(AMRContext),
     .init           = amr_nb_decode_init,
     .close          = amr_nb_decode_close,
     .decode         = amr_nb_decode_frame,
     .capabilities   = CODEC_CAP_DR1,
     .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;

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

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

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

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

     s->enc_mode    = get_bitrate_mode(avctx->bit_rate, avctx);
     s->enc_bitrate = avctx->bit_rate;

     return 0;
 }

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

     Encoder_Interface_exit(s->enc_state);
     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 != avctx->bit_rate) {
         s->enc_mode    = get_bitrate_mode(avctx->bit_rate, avctx);
         s->enc_bitrate = avctx->bit_rate;
     }

     written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, data,
                                        frame, 0);
     av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
             written, s->enc_mode, frame[0]);

     return written;
 }

 AVCodec ff_libopencore_amrnb_encoder = {
     .name           = "libopencore_amrnb",
     .type           = AVMEDIA_TYPE_AUDIO,
     .id             = CODEC_ID_AMR_NB,
     .priv_data_size = sizeof(AMRContext),
     .init           = amr_nb_encode_init,
     .encode         = amr_nb_encode_frame,
     .close          = amr_nb_encode_close,
     .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
     .priv_class = &class,
 };

 #endif

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

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

 typedef struct AMRWBContext {
     AVFrame frame;
     void  *state;
 } AMRWBContext;

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

     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 AVERROR(ENOSYS);
     }

     avcodec_get_frame_defaults(&s->frame);
     avctx->coded_frame = &s->frame;

     return 0;
 }

 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
                                int *got_frame_ptr, AVPacket *avpkt)
 {
     const uint8_t *buf = avpkt->data;
     int buf_size       = avpkt->size;
     AMRWBContext *s    = avctx->priv_data;
     int mode, ret;
     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};

     /* get output buffer */
     s->frame.nb_samples = 320;
     if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return ret;
     }

     mode        = (buf[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 AVERROR_INVALIDDATA;
     }

     D_IF_decode(s->state, buf, (short *)s->frame.data[0], _good_frame);

     *got_frame_ptr   = 1;
     *(AVFrame *)data = s->frame;

     return packet_size;
 }

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

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

 AVCodec ff_libopencore_amrwb_decoder = {
     .name           = "libopencore_amrwb",
     .type           = AVMEDIA_TYPE_AUDIO,
     .id             = CODEC_ID_AMR_WB,
     .priv_data_size = sizeof(AMRWBContext),
     .init           = amr_wb_decode_init,
     .close          = amr_wb_decode_close,
     .decode         = amr_wb_decode_frame,
     .capabilities   = CODEC_CAP_DR1,
     .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"
	#include "libavutil/avstring.h"
	#include "libavutil/opt.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 = AV_SAMPLE_FMT_S16;
	}

	#if CONFIG_LIBOPENCORE_AMRNB

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

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

	/* Match desired bitrate */
	static int get_bitrate_mode(int bitrate, void *log_ctx)
	{
	/* make the correspondance between bitrate and mode */
	static const AMR_bitrates rates[] = {
	{ 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
	{ 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
	};
	int i, best = -1, min_diff = 0;
	char log_buf[200];

	for (i = 0; i < 8; i++) {
	if (rates[i].rate == bitrate)
	return rates[i].mode;
	if (best < 0 \|\| abs(rates[i].rate - bitrate) < min_diff) {
	best = i;
	min_diff = abs(rates[i].rate - bitrate);
	}
	}
	/* no bitrate matching exactly, log a warning */
	snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
	for (i = 0; i < 8; i++)
	av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
	av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
	av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);

	return best;
	}

	typedef struct AMRContext {
	AVClass *av_class;
	AVFrame frame;
	void *dec_state;
	void *enc_state;
	int enc_bitrate;
	int enc_mode;
	int enc_dtx;
	} AMRContext;

	static const AVOption options[] = {
	{ "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 },
	{ NULL }
	};

	static const AVClass class = {
	"libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
	};

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

	s->dec_state = Decoder_Interface_init();
	if (!s->dec_state) {
	av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\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 AVERROR(ENOSYS);
	}

	avcodec_get_frame_defaults(&s->frame);
	avctx->coded_frame = &s->frame;

	return 0;
	}

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

	Decoder_Interface_exit(s->dec_state);

	return 0;
	}

	static int amr_nb_decode_frame(AVCodecContext avctx, void data,
	int got_frame_ptr, AVPacket avpkt)
	{
	const uint8_t *buf = avpkt->data;
	int buf_size = avpkt->size;
	AMRContext *s = avctx->priv_data;
	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, ret;

	av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
	buf, buf_size, avctx->frame_number);

	/* get output buffer */
	s->frame.nb_samples = 160;
	if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
	av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
	return ret;
	}

	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 AVERROR_INVALIDDATA;
	}

	av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
	packet_size, buf[0], buf[1], buf[2], buf[3]);
	/* call decoder */
	Decoder_Interface_Decode(s->dec_state, buf, (short *)s->frame.data[0], 0);

	*got_frame_ptr = 1;
	(AVFrame )data = s->frame;

	return packet_size;
	}

	AVCodec ff_libopencore_amrnb_decoder = {
	.name = "libopencore_amrnb",
	.type = AVMEDIA_TYPE_AUDIO,
	.id = CODEC_ID_AMR_NB,
	.priv_data_size = sizeof(AMRContext),
	.init = amr_nb_decode_init,
	.close = amr_nb_decode_close,
	.decode = amr_nb_decode_frame,
	.capabilities = CODEC_CAP_DR1,
	.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;

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

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

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

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

	s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
	s->enc_bitrate = avctx->bit_rate;

	return 0;
	}

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

	Encoder_Interface_exit(s->enc_state);
	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 != avctx->bit_rate) {
	s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
	s->enc_bitrate = avctx->bit_rate;
	}

	written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, data,
	frame, 0);
	av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
	written, s->enc_mode, frame[0]);

	return written;
	}

	AVCodec ff_libopencore_amrnb_encoder = {
	.name = "libopencore_amrnb",
	.type = AVMEDIA_TYPE_AUDIO,
	.id = CODEC_ID_AMR_NB,
	.priv_data_size = sizeof(AMRContext),
	.init = amr_nb_encode_init,
	.encode = amr_nb_encode_frame,
	.close = amr_nb_encode_close,
	.sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
	.long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
	.priv_class = &class,
	};

	#endif

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

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

	typedef struct AMRWBContext {
	AVFrame frame;
	void *state;
	} AMRWBContext;

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

	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 AVERROR(ENOSYS);
	}

	avcodec_get_frame_defaults(&s->frame);
	avctx->coded_frame = &s->frame;

	return 0;
	}

	static int amr_wb_decode_frame(AVCodecContext avctx, void data,
	int got_frame_ptr, AVPacket avpkt)
	{
	const uint8_t *buf = avpkt->data;
	int buf_size = avpkt->size;
	AMRWBContext *s = avctx->priv_data;
	int mode, ret;
	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};

	/* get output buffer */
	s->frame.nb_samples = 320;
	if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
	av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
	return ret;
	}

	mode = (buf[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 AVERROR_INVALIDDATA;
	}

	D_IF_decode(s->state, buf, (short *)s->frame.data[0], _good_frame);

	*got_frame_ptr = 1;
	(AVFrame )data = s->frame;

	return packet_size;
	}

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

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

	AVCodec ff_libopencore_amrwb_decoder = {
	.name = "libopencore_amrwb",
	.type = AVMEDIA_TYPE_AUDIO,
	.id = CODEC_ID_AMR_WB,
	.priv_data_size = sizeof(AMRWBContext),
	.init = amr_wb_decode_init,
	.close = amr_wb_decode_close,
	.decode = amr_wb_decode_frame,
	.capabilities = CODEC_CAP_DR1,
	.long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
	};

	#endif /* CONFIG_LIBOPENCORE_AMRWB */