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Diffstat (limited to 'libavcodec/dcadec.h')
-rw-r--r-- | libavcodec/dcadec.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/libavcodec/dcadec.h b/libavcodec/dcadec.h new file mode 100644 index 0000000..456f3c4 --- /dev/null +++ b/libavcodec/dcadec.h @@ -0,0 +1,97 @@ +/* + * 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 < s->index || p > s->size_in_bits) + return -1; + s->index = p; + return 0; +} + +#endif |