mirror of
https://github.com/FFmpeg/FFmpeg.git
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107 lines
3.3 KiB
C
107 lines
3.3 KiB
C
/*
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* Copyright (C) 2016 foo86
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_DCADEC_H
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#define AVCODEC_DCADEC_H
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#include <stdint.h>
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#include "libavutil/crc.h"
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#include "libavutil/float_dsp.h"
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#include "libavutil/log.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "dca.h"
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#include "dcadsp.h"
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#include "dca_core.h"
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#include "dca_exss.h"
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#include "dca_xll.h"
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#include "dca_lbr.h"
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#define DCA_PACKET_CORE 0x01
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#define DCA_PACKET_EXSS 0x02
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#define DCA_PACKET_XLL 0x04
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#define DCA_PACKET_LBR 0x08
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#define DCA_PACKET_MASK 0x0f
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#define DCA_PACKET_RECOVERY 0x10 ///< Sync error recovery flag
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#define DCA_PACKET_RESIDUAL 0x20 ///< Core valid for residual decoding
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enum DCAOutputChannelOrder {
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CHANNEL_ORDER_DEFAULT,
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CHANNEL_ORDER_CODED,
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};
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typedef struct DCAContext {
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const AVClass *class; ///< class for AVOptions
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AVCodecContext *avctx;
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DCACoreDecoder core; ///< Core decoder context
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DCAExssParser exss; ///< EXSS parser context
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DCAXllDecoder xll; ///< XLL decoder context
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DCALbrDecoder lbr; ///< LBR decoder context
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DCADSPContext dcadsp;
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const AVCRC *crctab;
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uint8_t *buffer; ///< Packet buffer
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unsigned int buffer_size;
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int packet; ///< Packet flags
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int request_channel_layout; ///< Converted from avctx.request_channel_layout
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int core_only; ///< Core only decoding flag
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int output_channel_order;
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AVChannelLayout downmix_layout;
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} DCAContext;
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int ff_dca_set_channel_layout(AVCodecContext *avctx, int *ch_remap, int dca_mask);
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void ff_dca_downmix_to_stereo_fixed(DCADSPContext *dcadsp, int32_t **samples,
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int *coeff_l, int nsamples, int ch_mask);
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void ff_dca_downmix_to_stereo_float(AVFloatDSPContext *fdsp, float **samples,
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int *coeff_l, int nsamples, int ch_mask);
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static inline int ff_dca_check_crc(AVCodecContext *avctx, GetBitContext *s,
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int p1, int p2)
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{
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DCAContext *dca = avctx->priv_data;
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if (!(avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_CAREFUL)))
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return 0;
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if (((p1 | p2) & 7) || p1 < 0 || p2 > s->size_in_bits || p2 - p1 < 16)
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return -1;
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if (av_crc(dca->crctab, 0xffff, s->buffer + p1 / 8, (p2 - p1) / 8))
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return -1;
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return 0;
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}
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static inline int ff_dca_seek_bits(GetBitContext *s, int p)
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{
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if (p < get_bits_count(s) || p > s->size_in_bits)
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return -1;
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skip_bits_long(s, p - get_bits_count(s));
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return 0;
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}
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#endif
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