/* * 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 <stdint.h> #include "libavutil/crc.h" #include "libavutil/float_dsp.h" #include "libavutil/log.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