aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* Copyright (C) 2016 foo86
*
* 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
*/
#ifndef AVCODEC_DCADEC_H
#define AVCODEC_DCADEC_H
#include "libavutil/common.h"
#include "libavutil/crc.h"
#include "libavutil/float_dsp.h"
#include "avcodec.h"
#include "get_bits.h"
#include "dca.h"
#include "dcadsp.h"
#include "dca_core.h"
#include "dca_exss.h"
#include "dca_xll.h"
#include "dca_lbr.h"
#define DCA_PACKET_CORE 0x01
#define DCA_PACKET_EXSS 0x02
#define DCA_PACKET_XLL 0x04
#define DCA_PACKET_LBR 0x08
#define DCA_PACKET_MASK 0x0f
#define DCA_PACKET_RECOVERY 0x10 ///< Sync error recovery flag
#define DCA_PACKET_RESIDUAL 0x20 ///< Core valid for residual decoding
typedef struct DCAContext {
const AVClass *class; ///< class for AVOptions
AVCodecContext *avctx;
DCACoreDecoder core; ///< Core decoder context
DCAExssParser exss; ///< EXSS parser context
DCAXllDecoder xll; ///< XLL decoder context
DCALbrDecoder lbr; ///< LBR decoder context
DCADSPContext dcadsp;
const AVCRC *crctab;
uint8_t *buffer; ///< Packet buffer
unsigned int buffer_size;
int packet; ///< Packet flags
int request_channel_layout; ///< Converted from avctx.request_channel_layout
int core_only; ///< Core only decoding flag
} DCAContext;
int ff_dca_set_channel_layout(AVCodecContext *avctx, int *ch_remap, int dca_mask);
void ff_dca_downmix_to_stereo_fixed(DCADSPContext *dcadsp, int32_t **samples,
int *coeff_l, int nsamples, int ch_mask);
void ff_dca_downmix_to_stereo_float(AVFloatDSPContext *fdsp, float **samples,
int *coeff_l, int nsamples, int ch_mask);
static inline int ff_dca_check_crc(AVCodecContext *avctx, GetBitContext *s,
int p1, int p2)
{
DCAContext *dca = avctx->priv_data;
if (!(avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_CAREFUL)))
return 0;
if (((p1 | p2) & 7) || p1 < 0 || p2 > s->size_in_bits || p2 - p1 < 16)
return -1;
if (av_crc(dca->crctab, 0xffff, s->buffer + p1 / 8, (p2 - p1) / 8))
return -1;
return 0;
}
static inline int ff_dca_seek_bits(GetBitContext *s, int p)
{
if (p < get_bits_count(s) || p > s->size_in_bits)
return -1;
skip_bits_long(s, p - get_bits_count(s));
return 0;
}
#endif
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