libavcodec/libgsm.c - third_party/ffmpeg - Git at Google

 /*
  * Interface to libgsm for gsm encoding/decoding
  * Copyright (c) 2005 Alban Bedel <albeu@free.fr>
  * Copyright (c) 2006, 2007 Michel Bardiaux <mbardiaux@mediaxim.be>
  *
  * 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
  */

 /**
  * @file
  * Interface to libgsm for gsm encoding/decoding
  */

 // The idiosyncrasies of GSM-in-WAV are explained at http://kbs.cs.tu-berlin.de/~jutta/toast.html

 #include <gsm/gsm.h>

 #include "avcodec.h"
 #include "gsm.h"

 static av_cold int libgsm_encode_init(AVCodecContext *avctx) {
     if (avctx->channels > 1) {
         av_log(avctx, AV_LOG_ERROR, "Mono required for GSM, got %d channels\n",
                avctx->channels);
         return -1;
     }

     if (avctx->sample_rate != 8000) {
         av_log(avctx, AV_LOG_ERROR, "Sample rate 8000Hz required for GSM, got %dHz\n",
                avctx->sample_rate);
         if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL)
             return -1;
     }
     if (avctx->bit_rate != 13000 /* Official */ &&
         avctx->bit_rate != 13200 /* Very common */ &&
         avctx->bit_rate != 0 /* Unknown; a.o. mov does not set bitrate when decoding */ ) {
         av_log(avctx, AV_LOG_ERROR, "Bitrate 13000bps required for GSM, got %dbps\n",
                avctx->bit_rate);
         if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL)
             return -1;
     }

     avctx->priv_data = gsm_create();

     switch(avctx->codec_id) {
     case CODEC_ID_GSM:
         avctx->frame_size = GSM_FRAME_SIZE;
         avctx->block_align = GSM_BLOCK_SIZE;
         break;
     case CODEC_ID_GSM_MS: {
         int one = 1;
         gsm_option(avctx->priv_data, GSM_OPT_WAV49, &one);
         avctx->frame_size = 2*GSM_FRAME_SIZE;
         avctx->block_align = GSM_MS_BLOCK_SIZE;
         }
     }

     avctx->coded_frame= avcodec_alloc_frame();
     avctx->coded_frame->key_frame= 1;

     return 0;
 }

 static av_cold int libgsm_encode_close(AVCodecContext *avctx) {
     av_freep(&avctx->coded_frame);
     gsm_destroy(avctx->priv_data);
     avctx->priv_data = NULL;
     return 0;
 }

 static int libgsm_encode_frame(AVCodecContext *avctx,
                                unsigned char *frame, int buf_size, void *data) {
     // we need a full block
     if(buf_size < avctx->block_align) return 0;

     switch(avctx->codec_id) {
     case CODEC_ID_GSM:
         gsm_encode(avctx->priv_data,data,frame);
         break;
     case CODEC_ID_GSM_MS:
         gsm_encode(avctx->priv_data,data,frame);
         gsm_encode(avctx->priv_data,((short*)data)+GSM_FRAME_SIZE,frame+32);
     }
     return avctx->block_align;
 }


 AVCodec ff_libgsm_encoder = {
     .name           = "libgsm",
     .type           = AVMEDIA_TYPE_AUDIO,
     .id             = CODEC_ID_GSM,
     .init           = libgsm_encode_init,
     .encode         = libgsm_encode_frame,
     .close          = libgsm_encode_close,
     .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
 };

 AVCodec ff_libgsm_ms_encoder = {
     .name           = "libgsm_ms",
     .type           = AVMEDIA_TYPE_AUDIO,
     .id             = CODEC_ID_GSM_MS,
     .init           = libgsm_encode_init,
     .encode         = libgsm_encode_frame,
     .close          = libgsm_encode_close,
     .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
 };

 typedef struct LibGSMDecodeContext {
     AVFrame frame;
     struct gsm_state *state;
 } LibGSMDecodeContext;

 static av_cold int libgsm_decode_init(AVCodecContext *avctx) {
     LibGSMDecodeContext *s = avctx->priv_data;

     if (avctx->channels > 1) {
         av_log(avctx, AV_LOG_ERROR, "Mono required for GSM, got %d channels\n",
                avctx->channels);
         return -1;
     }

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

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

     avctx->sample_fmt = AV_SAMPLE_FMT_S16;

     s->state = gsm_create();

     switch(avctx->codec_id) {
     case CODEC_ID_GSM:
         avctx->frame_size  = GSM_FRAME_SIZE;
         avctx->block_align = GSM_BLOCK_SIZE;
         break;
     case CODEC_ID_GSM_MS: {
         int one = 1;
         gsm_option(s->state, GSM_OPT_WAV49, &one);
         avctx->frame_size  = 2 * GSM_FRAME_SIZE;
         avctx->block_align = GSM_MS_BLOCK_SIZE;
         }
     }

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

     return 0;
 }

 static av_cold int libgsm_decode_close(AVCodecContext *avctx) {
     LibGSMDecodeContext *s = avctx->priv_data;

     gsm_destroy(s->state);
     s->state = NULL;
     return 0;
 }

 static int libgsm_decode_frame(AVCodecContext *avctx, void *data,
                                int *got_frame_ptr, AVPacket *avpkt)
 {
     int i, ret;
     LibGSMDecodeContext *s = avctx->priv_data;
     uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
     int16_t *samples;

     if (buf_size < avctx->block_align) {
         av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
         return AVERROR_INVALIDDATA;
     }

     /* get output buffer */
     s->frame.nb_samples = avctx->frame_size;
     if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return ret;
     }
     samples = (int16_t *)s->frame.data[0];

     for (i = 0; i < avctx->frame_size / GSM_FRAME_SIZE; i++) {
         if ((ret = gsm_decode(s->state, buf, samples)) < 0)
             return -1;
         buf     += GSM_BLOCK_SIZE;
         samples += GSM_FRAME_SIZE;
     }

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

     return avctx->block_align;
 }

 static void libgsm_flush(AVCodecContext *avctx) {
     LibGSMDecodeContext *s = avctx->priv_data;
     int one = 1;

     gsm_destroy(s->state);
     s->state = gsm_create();
     if (avctx->codec_id == CODEC_ID_GSM_MS)
         gsm_option(s->state, GSM_OPT_WAV49, &one);
 }

 AVCodec ff_libgsm_decoder = {
     .name           = "libgsm",
     .type           = AVMEDIA_TYPE_AUDIO,
     .id             = CODEC_ID_GSM,
     .priv_data_size = sizeof(LibGSMDecodeContext),
     .init           = libgsm_decode_init,
     .close          = libgsm_decode_close,
     .decode         = libgsm_decode_frame,
     .flush          = libgsm_flush,
     .capabilities   = CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
 };

 AVCodec ff_libgsm_ms_decoder = {
     .name           = "libgsm_ms",
     .type           = AVMEDIA_TYPE_AUDIO,
     .id             = CODEC_ID_GSM_MS,
     .priv_data_size = sizeof(LibGSMDecodeContext),
     .init           = libgsm_decode_init,
     .close          = libgsm_decode_close,
     .decode         = libgsm_decode_frame,
     .flush          = libgsm_flush,
     .capabilities   = CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
 };
	/*
	* Interface to libgsm for gsm encoding/decoding
	* Copyright (c) 2005 Alban Bedel <albeu@free.fr>
	* Copyright (c) 2006, 2007 Michel Bardiaux <mbardiaux@mediaxim.be>
	*
	* 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
	*/

	/**
	* @file
	* Interface to libgsm for gsm encoding/decoding
	*/

	// The idiosyncrasies of GSM-in-WAV are explained at http://kbs.cs.tu-berlin.de/~jutta/toast.html

	#include <gsm/gsm.h>

	#include "avcodec.h"
	#include "gsm.h"

	static av_cold int libgsm_encode_init(AVCodecContext *avctx) {
	if (avctx->channels > 1) {
	av_log(avctx, AV_LOG_ERROR, "Mono required for GSM, got %d channels\n",
	avctx->channels);
	return -1;
	}

	if (avctx->sample_rate != 8000) {
	av_log(avctx, AV_LOG_ERROR, "Sample rate 8000Hz required for GSM, got %dHz\n",
	avctx->sample_rate);
	if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL)
	return -1;
	}
	if (avctx->bit_rate != 13000 /* Official */ &&
	avctx->bit_rate != 13200 /* Very common */ &&
	avctx->bit_rate != 0 /* Unknown; a.o. mov does not set bitrate when decoding */ ) {
	av_log(avctx, AV_LOG_ERROR, "Bitrate 13000bps required for GSM, got %dbps\n",
	avctx->bit_rate);
	if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL)
	return -1;
	}

	avctx->priv_data = gsm_create();

	switch(avctx->codec_id) {
	case CODEC_ID_GSM:
	avctx->frame_size = GSM_FRAME_SIZE;
	avctx->block_align = GSM_BLOCK_SIZE;
	break;
	case CODEC_ID_GSM_MS: {
	int one = 1;
	gsm_option(avctx->priv_data, GSM_OPT_WAV49, &one);
	avctx->frame_size = 2*GSM_FRAME_SIZE;
	avctx->block_align = GSM_MS_BLOCK_SIZE;
	}
	}

	avctx->coded_frame= avcodec_alloc_frame();
	avctx->coded_frame->key_frame= 1;

	return 0;
	}

	static av_cold int libgsm_encode_close(AVCodecContext *avctx) {
	av_freep(&avctx->coded_frame);
	gsm_destroy(avctx->priv_data);
	avctx->priv_data = NULL;
	return 0;
	}

	static int libgsm_encode_frame(AVCodecContext *avctx,
	unsigned char frame, int buf_size, void data) {
	// we need a full block
	if(buf_size < avctx->block_align) return 0;

	switch(avctx->codec_id) {
	case CODEC_ID_GSM:
	gsm_encode(avctx->priv_data,data,frame);
	break;
	case CODEC_ID_GSM_MS:
	gsm_encode(avctx->priv_data,data,frame);
	gsm_encode(avctx->priv_data,((short*)data)+GSM_FRAME_SIZE,frame+32);
	}
	return avctx->block_align;
	}


	AVCodec ff_libgsm_encoder = {
	.name = "libgsm",
	.type = AVMEDIA_TYPE_AUDIO,
	.id = CODEC_ID_GSM,
	.init = libgsm_encode_init,
	.encode = libgsm_encode_frame,
	.close = libgsm_encode_close,
	.sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
	.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
	};

	AVCodec ff_libgsm_ms_encoder = {
	.name = "libgsm_ms",
	.type = AVMEDIA_TYPE_AUDIO,
	.id = CODEC_ID_GSM_MS,
	.init = libgsm_encode_init,
	.encode = libgsm_encode_frame,
	.close = libgsm_encode_close,
	.sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
	.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
	};

	typedef struct LibGSMDecodeContext {
	AVFrame frame;
	struct gsm_state *state;
	} LibGSMDecodeContext;

	static av_cold int libgsm_decode_init(AVCodecContext *avctx) {
	LibGSMDecodeContext *s = avctx->priv_data;

	if (avctx->channels > 1) {
	av_log(avctx, AV_LOG_ERROR, "Mono required for GSM, got %d channels\n",
	avctx->channels);
	return -1;
	}

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

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

	avctx->sample_fmt = AV_SAMPLE_FMT_S16;

	s->state = gsm_create();

	switch(avctx->codec_id) {
	case CODEC_ID_GSM:
	avctx->frame_size = GSM_FRAME_SIZE;
	avctx->block_align = GSM_BLOCK_SIZE;
	break;
	case CODEC_ID_GSM_MS: {
	int one = 1;
	gsm_option(s->state, GSM_OPT_WAV49, &one);
	avctx->frame_size = 2 * GSM_FRAME_SIZE;
	avctx->block_align = GSM_MS_BLOCK_SIZE;
	}
	}

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

	return 0;
	}

	static av_cold int libgsm_decode_close(AVCodecContext *avctx) {
	LibGSMDecodeContext *s = avctx->priv_data;

	gsm_destroy(s->state);
	s->state = NULL;
	return 0;
	}

	static int libgsm_decode_frame(AVCodecContext avctx, void data,
	int got_frame_ptr, AVPacket avpkt)
	{
	int i, ret;
	LibGSMDecodeContext *s = avctx->priv_data;
	uint8_t *buf = avpkt->data;
	int buf_size = avpkt->size;
	int16_t *samples;

	if (buf_size < avctx->block_align) {
	av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
	return AVERROR_INVALIDDATA;
	}

	/* get output buffer */
	s->frame.nb_samples = avctx->frame_size;
	if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
	av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
	return ret;
	}
	samples = (int16_t *)s->frame.data[0];

	for (i = 0; i < avctx->frame_size / GSM_FRAME_SIZE; i++) {
	if ((ret = gsm_decode(s->state, buf, samples)) < 0)
	return -1;
	buf += GSM_BLOCK_SIZE;
	samples += GSM_FRAME_SIZE;
	}

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

	return avctx->block_align;
	}

	static void libgsm_flush(AVCodecContext *avctx) {
	LibGSMDecodeContext *s = avctx->priv_data;
	int one = 1;

	gsm_destroy(s->state);
	s->state = gsm_create();
	if (avctx->codec_id == CODEC_ID_GSM_MS)
	gsm_option(s->state, GSM_OPT_WAV49, &one);
	}

	AVCodec ff_libgsm_decoder = {
	.name = "libgsm",
	.type = AVMEDIA_TYPE_AUDIO,
	.id = CODEC_ID_GSM,
	.priv_data_size = sizeof(LibGSMDecodeContext),
	.init = libgsm_decode_init,
	.close = libgsm_decode_close,
	.decode = libgsm_decode_frame,
	.flush = libgsm_flush,
	.capabilities = CODEC_CAP_DR1,
	.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
	};

	AVCodec ff_libgsm_ms_decoder = {
	.name = "libgsm_ms",
	.type = AVMEDIA_TYPE_AUDIO,
	.id = CODEC_ID_GSM_MS,
	.priv_data_size = sizeof(LibGSMDecodeContext),
	.init = libgsm_decode_init,
	.close = libgsm_decode_close,
	.decode = libgsm_decode_frame,
	.flush = libgsm_flush,
	.capabilities = CODEC_CAP_DR1,
	.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
	};