libavcodec/libfaac.c - nest-android-app/ffmpeg - Git at Google

 /*
  * Interface to libfaac for aac encoding
  * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
  *
  * 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 libfaac for aac encoding.
  */

 #include <faac.h>

 #include "libavutil/channel_layout.h"
 #include "libavutil/common.h"
 #include "avcodec.h"
 #include "audio_frame_queue.h"
 #include "internal.h"


 /* libfaac has an encoder delay of 1024 samples */
 #define FAAC_DELAY_SAMPLES 1024

 typedef struct FaacAudioContext {
     faacEncHandle faac_handle;
     AudioFrameQueue afq;
 } FaacAudioContext;

 static av_cold int Faac_encode_close(AVCodecContext *avctx)
 {
     FaacAudioContext *s = avctx->priv_data;

     av_freep(&avctx->extradata);
     ff_af_queue_close(&s->afq);

     if (s->faac_handle)
         faacEncClose(s->faac_handle);

     return 0;
 }

 static const int channel_maps[][6] = {
     { 2, 0, 1 },          //< C L R
     { 2, 0, 1, 3 },       //< C L R Cs
     { 2, 0, 1, 3, 4 },    //< C L R Ls Rs
     { 2, 0, 1, 4, 5, 3 }, //< C L R Ls Rs LFE
 };

 static av_cold int Faac_encode_init(AVCodecContext *avctx)
 {
     FaacAudioContext *s = avctx->priv_data;
     faacEncConfigurationPtr faac_cfg;
     unsigned long samples_input, max_bytes_output;
     int ret;

     /* number of channels */
     if (avctx->channels < 1 || avctx->channels > 6) {
         av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
         ret = AVERROR(EINVAL);
         goto error;
     }

     s->faac_handle = faacEncOpen(avctx->sample_rate,
                                  avctx->channels,
                                  &samples_input, &max_bytes_output);
     if (!s->faac_handle) {
         av_log(avctx, AV_LOG_ERROR, "error in faacEncOpen()\n");
         ret = AVERROR_UNKNOWN;
         goto error;
     }

     /* check faac version */
     faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
     if (faac_cfg->version != FAAC_CFG_VERSION) {
         av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
         ret = AVERROR(EINVAL);
         goto error;
     }

     /* put the options in the configuration struct */
     switch(avctx->profile) {
         case FF_PROFILE_AAC_MAIN:
             faac_cfg->aacObjectType = MAIN;
             break;
         case FF_PROFILE_UNKNOWN:
         case FF_PROFILE_AAC_LOW:
             faac_cfg->aacObjectType = LOW;
             break;
         case FF_PROFILE_AAC_SSR:
             faac_cfg->aacObjectType = SSR;
             break;
         case FF_PROFILE_AAC_LTP:
             faac_cfg->aacObjectType = LTP;
             break;
         default:
             av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
             ret = AVERROR(EINVAL);
             goto error;
     }
     faac_cfg->mpegVersion = MPEG4;
     faac_cfg->useTns = 0;
     faac_cfg->allowMidside = 1;
     faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
     faac_cfg->bandWidth = avctx->cutoff;
     if(avctx->flags & AV_CODEC_FLAG_QSCALE) {
         faac_cfg->bitRate = 0;
         faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
     }
     faac_cfg->outputFormat = 1;
     faac_cfg->inputFormat = FAAC_INPUT_16BIT;
     if (avctx->channels > 2)
         memcpy(faac_cfg->channel_map, channel_maps[avctx->channels-3],
                avctx->channels * sizeof(int));

     avctx->frame_size = samples_input / avctx->channels;

     /* Set decoder specific info */
     avctx->extradata_size = 0;
     if (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {

         unsigned char *buffer = NULL;
         unsigned long decoder_specific_info_size;

         if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
                                            &decoder_specific_info_size)) {
             avctx->extradata = av_malloc(decoder_specific_info_size + AV_INPUT_BUFFER_PADDING_SIZE);
             if (!avctx->extradata) {
                 ret = AVERROR(ENOMEM);
                 goto error;
             }
             avctx->extradata_size = decoder_specific_info_size;
             memcpy(avctx->extradata, buffer, avctx->extradata_size);
             faac_cfg->outputFormat = 0;
         }
         free(buffer);
     }

     if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
         int i;
         for (i = avctx->bit_rate/1000; i ; i--) {
             faac_cfg->bitRate = 1000*i / avctx->channels;
             if (faacEncSetConfiguration(s->faac_handle, faac_cfg))
                 break;
         }
         if (!i) {
             av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
             ret = AVERROR(EINVAL);
             goto error;
         } else {
             avctx->bit_rate = 1000*i;
             av_log(avctx, AV_LOG_WARNING, "libfaac doesn't support the specified bitrate, using %dkbit/s instead\n", i);
         }
     }

     avctx->initial_padding = FAAC_DELAY_SAMPLES;
     ff_af_queue_init(avctx, &s->afq);

     return 0;
 error:
     Faac_encode_close(avctx);
     return ret;
 }

 static int Faac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
                              const AVFrame *frame, int *got_packet_ptr)
 {
     FaacAudioContext *s = avctx->priv_data;
     int bytes_written, ret;
     int num_samples  = frame ? frame->nb_samples : 0;
     void *samples    = frame ? frame->data[0]    : NULL;

     if ((ret = ff_alloc_packet2(avctx, avpkt, (7 + 768) * avctx->channels, 0)) < 0)
         return ret;

     bytes_written = faacEncEncode(s->faac_handle, samples,
                                   num_samples * avctx->channels,
                                   avpkt->data, avpkt->size);
     if (bytes_written < 0) {
         av_log(avctx, AV_LOG_ERROR, "faacEncEncode() error\n");
         return bytes_written;
     }

     /* add current frame to the queue */
     if (frame) {
         if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
             return ret;
     }

     if (!bytes_written)
         return 0;

     /* Get the next frame pts/duration */
     ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
                        &avpkt->duration);

     avpkt->size = bytes_written;
     *got_packet_ptr = 1;
     return 0;
 }

 static const AVProfile profiles[] = {
     { FF_PROFILE_AAC_MAIN, "Main" },
     { FF_PROFILE_AAC_LOW,  "LC"   },
     { FF_PROFILE_AAC_SSR,  "SSR"  },
     { FF_PROFILE_AAC_LTP,  "LTP"  },
     { FF_PROFILE_UNKNOWN },
 };

 static const uint64_t faac_channel_layouts[] = {
     AV_CH_LAYOUT_MONO,
     AV_CH_LAYOUT_STEREO,
     AV_CH_LAYOUT_SURROUND,
     AV_CH_LAYOUT_4POINT0,
     AV_CH_LAYOUT_5POINT0_BACK,
     AV_CH_LAYOUT_5POINT1_BACK,
     0
 };

 AVCodec ff_libfaac_encoder = {
     .name           = "libfaac",
     .long_name      = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Coding)"),
     .type           = AVMEDIA_TYPE_AUDIO,
     .id             = AV_CODEC_ID_AAC,
     .priv_data_size = sizeof(FaacAudioContext),
     .init           = Faac_encode_init,
     .encode2        = Faac_encode_frame,
     .close          = Faac_encode_close,
     .capabilities   = AV_CODEC_CAP_SMALL_LAST_FRAME | AV_CODEC_CAP_DELAY,
     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
                                                      AV_SAMPLE_FMT_NONE },
     .profiles       = NULL_IF_CONFIG_SMALL(profiles),
     .channel_layouts = faac_channel_layouts,
 };
	/*
	* Interface to libfaac for aac encoding
	* Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
	*
	* 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 libfaac for aac encoding.
	*/

	#include <faac.h>

	#include "libavutil/channel_layout.h"
	#include "libavutil/common.h"
	#include "avcodec.h"
	#include "audio_frame_queue.h"
	#include "internal.h"


	/* libfaac has an encoder delay of 1024 samples */
	#define FAAC_DELAY_SAMPLES 1024

	typedef struct FaacAudioContext {
	faacEncHandle faac_handle;
	AudioFrameQueue afq;
	} FaacAudioContext;

	static av_cold int Faac_encode_close(AVCodecContext *avctx)
	{
	FaacAudioContext *s = avctx->priv_data;

	av_freep(&avctx->extradata);
	ff_af_queue_close(&s->afq);

	if (s->faac_handle)
	faacEncClose(s->faac_handle);

	return 0;
	}

	static const int channel_maps[][6] = {
	{ 2, 0, 1 }, //< C L R
	{ 2, 0, 1, 3 }, //< C L R Cs
	{ 2, 0, 1, 3, 4 }, //< C L R Ls Rs
	{ 2, 0, 1, 4, 5, 3 }, //< C L R Ls Rs LFE
	};

	static av_cold int Faac_encode_init(AVCodecContext *avctx)
	{
	FaacAudioContext *s = avctx->priv_data;
	faacEncConfigurationPtr faac_cfg;
	unsigned long samples_input, max_bytes_output;
	int ret;

	/* number of channels */
	if (avctx->channels < 1 \|\| avctx->channels > 6) {
	av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
	ret = AVERROR(EINVAL);
	goto error;
	}

	s->faac_handle = faacEncOpen(avctx->sample_rate,
	avctx->channels,
	&samples_input, &max_bytes_output);
	if (!s->faac_handle) {
	av_log(avctx, AV_LOG_ERROR, "error in faacEncOpen()\n");
	ret = AVERROR_UNKNOWN;
	goto error;
	}

	/* check faac version */
	faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
	if (faac_cfg->version != FAAC_CFG_VERSION) {
	av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
	ret = AVERROR(EINVAL);
	goto error;
	}

	/* put the options in the configuration struct */
	switch(avctx->profile) {
	case FF_PROFILE_AAC_MAIN:
	faac_cfg->aacObjectType = MAIN;
	break;
	case FF_PROFILE_UNKNOWN:
	case FF_PROFILE_AAC_LOW:
	faac_cfg->aacObjectType = LOW;
	break;
	case FF_PROFILE_AAC_SSR:
	faac_cfg->aacObjectType = SSR;
	break;
	case FF_PROFILE_AAC_LTP:
	faac_cfg->aacObjectType = LTP;
	break;
	default:
	av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
	ret = AVERROR(EINVAL);
	goto error;
	}
	faac_cfg->mpegVersion = MPEG4;
	faac_cfg->useTns = 0;
	faac_cfg->allowMidside = 1;
	faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
	faac_cfg->bandWidth = avctx->cutoff;
	if(avctx->flags & AV_CODEC_FLAG_QSCALE) {
	faac_cfg->bitRate = 0;
	faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
	}
	faac_cfg->outputFormat = 1;
	faac_cfg->inputFormat = FAAC_INPUT_16BIT;
	if (avctx->channels > 2)
	memcpy(faac_cfg->channel_map, channel_maps[avctx->channels-3],
	avctx->channels * sizeof(int));

	avctx->frame_size = samples_input / avctx->channels;

	/* Set decoder specific info */
	avctx->extradata_size = 0;
	if (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {

	unsigned char *buffer = NULL;
	unsigned long decoder_specific_info_size;

	if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
	&decoder_specific_info_size)) {
	avctx->extradata = av_malloc(decoder_specific_info_size + AV_INPUT_BUFFER_PADDING_SIZE);
	if (!avctx->extradata) {
	ret = AVERROR(ENOMEM);
	goto error;
	}
	avctx->extradata_size = decoder_specific_info_size;
	memcpy(avctx->extradata, buffer, avctx->extradata_size);
	faac_cfg->outputFormat = 0;
	}
	free(buffer);
	}

	if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
	int i;
	for (i = avctx->bit_rate/1000; i ; i--) {
	faac_cfg->bitRate = 1000*i / avctx->channels;
	if (faacEncSetConfiguration(s->faac_handle, faac_cfg))
	break;
	}
	if (!i) {
	av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
	ret = AVERROR(EINVAL);
	goto error;
	} else {
	avctx->bit_rate = 1000*i;
	av_log(avctx, AV_LOG_WARNING, "libfaac doesn't support the specified bitrate, using %dkbit/s instead\n", i);
	}
	}

	avctx->initial_padding = FAAC_DELAY_SAMPLES;
	ff_af_queue_init(avctx, &s->afq);

	return 0;
	error:
	Faac_encode_close(avctx);
	return ret;
	}

	static int Faac_encode_frame(AVCodecContext avctx, AVPacket avpkt,
	const AVFrame frame, int got_packet_ptr)
	{
	FaacAudioContext *s = avctx->priv_data;
	int bytes_written, ret;
	int num_samples = frame ? frame->nb_samples : 0;
	void *samples = frame ? frame->data[0] : NULL;

	if ((ret = ff_alloc_packet2(avctx, avpkt, (7 + 768) * avctx->channels, 0)) < 0)
	return ret;

	bytes_written = faacEncEncode(s->faac_handle, samples,
	num_samples * avctx->channels,
	avpkt->data, avpkt->size);
	if (bytes_written < 0) {
	av_log(avctx, AV_LOG_ERROR, "faacEncEncode() error\n");
	return bytes_written;
	}

	/* add current frame to the queue */
	if (frame) {
	if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
	return ret;
	}

	if (!bytes_written)
	return 0;

	/* Get the next frame pts/duration */
	ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
	&avpkt->duration);

	avpkt->size = bytes_written;
	*got_packet_ptr = 1;
	return 0;
	}

	static const AVProfile profiles[] = {
	{ FF_PROFILE_AAC_MAIN, "Main" },
	{ FF_PROFILE_AAC_LOW, "LC" },
	{ FF_PROFILE_AAC_SSR, "SSR" },
	{ FF_PROFILE_AAC_LTP, "LTP" },
	{ FF_PROFILE_UNKNOWN },
	};

	static const uint64_t faac_channel_layouts[] = {
	AV_CH_LAYOUT_MONO,
	AV_CH_LAYOUT_STEREO,
	AV_CH_LAYOUT_SURROUND,
	AV_CH_LAYOUT_4POINT0,
	AV_CH_LAYOUT_5POINT0_BACK,
	AV_CH_LAYOUT_5POINT1_BACK,
	0
	};

	AVCodec ff_libfaac_encoder = {
	.name = "libfaac",
	.long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Coding)"),
	.type = AVMEDIA_TYPE_AUDIO,
	.id = AV_CODEC_ID_AAC,
	.priv_data_size = sizeof(FaacAudioContext),
	.init = Faac_encode_init,
	.encode2 = Faac_encode_frame,
	.close = Faac_encode_close,
	.capabilities = AV_CODEC_CAP_SMALL_LAST_FRAME \| AV_CODEC_CAP_DELAY,
	.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
	AV_SAMPLE_FMT_NONE },
	.profiles = NULL_IF_CONFIG_SMALL(profiles),
	.channel_layouts = faac_channel_layouts,
	};