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99 lines
3.1 KiB
99 lines
3.1 KiB
/* |
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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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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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} 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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