blob: 456f3c433bb0467f4f2fe7ff6bbe687af2b253cf
| 1 | /* |
| 2 | * Copyright (C) 2016 foo86 |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #ifndef AVCODEC_DCADEC_H |
| 22 | #define AVCODEC_DCADEC_H |
| 23 | |
| 24 | #include "libavutil/common.h" |
| 25 | #include "libavutil/crc.h" |
| 26 | #include "libavutil/float_dsp.h" |
| 27 | |
| 28 | #include "avcodec.h" |
| 29 | #include "get_bits.h" |
| 30 | #include "dca.h" |
| 31 | #include "dcadsp.h" |
| 32 | #include "dca_core.h" |
| 33 | #include "dca_exss.h" |
| 34 | #include "dca_xll.h" |
| 35 | #include "dca_lbr.h" |
| 36 | |
| 37 | #define DCA_PACKET_CORE 0x01 |
| 38 | #define DCA_PACKET_EXSS 0x02 |
| 39 | #define DCA_PACKET_XLL 0x04 |
| 40 | #define DCA_PACKET_LBR 0x08 |
| 41 | #define DCA_PACKET_MASK 0x0f |
| 42 | |
| 43 | #define DCA_PACKET_RECOVERY 0x10 ///< Sync error recovery flag |
| 44 | #define DCA_PACKET_RESIDUAL 0x20 ///< Core valid for residual decoding |
| 45 | |
| 46 | typedef struct DCAContext { |
| 47 | const AVClass *class; ///< class for AVOptions |
| 48 | AVCodecContext *avctx; |
| 49 | |
| 50 | DCACoreDecoder core; ///< Core decoder context |
| 51 | DCAExssParser exss; ///< EXSS parser context |
| 52 | DCAXllDecoder xll; ///< XLL decoder context |
| 53 | DCALbrDecoder lbr; ///< LBR decoder context |
| 54 | |
| 55 | DCADSPContext dcadsp; |
| 56 | |
| 57 | const AVCRC *crctab; |
| 58 | |
| 59 | uint8_t *buffer; ///< Packet buffer |
| 60 | unsigned int buffer_size; |
| 61 | |
| 62 | int packet; ///< Packet flags |
| 63 | |
| 64 | int request_channel_layout; ///< Converted from avctx.request_channel_layout |
| 65 | int core_only; ///< Core only decoding flag |
| 66 | } DCAContext; |
| 67 | |
| 68 | int ff_dca_set_channel_layout(AVCodecContext *avctx, int *ch_remap, int dca_mask); |
| 69 | |
| 70 | void ff_dca_downmix_to_stereo_fixed(DCADSPContext *dcadsp, int32_t **samples, |
| 71 | int *coeff_l, int nsamples, int ch_mask); |
| 72 | void ff_dca_downmix_to_stereo_float(AVFloatDSPContext *fdsp, float **samples, |
| 73 | int *coeff_l, int nsamples, int ch_mask); |
| 74 | |
| 75 | static inline int ff_dca_check_crc(AVCodecContext *avctx, GetBitContext *s, |
| 76 | int p1, int p2) |
| 77 | { |
| 78 | DCAContext *dca = avctx->priv_data; |
| 79 | |
| 80 | if (!(avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_CAREFUL))) |
| 81 | return 0; |
| 82 | if (((p1 | p2) & 7) || p1 < 0 || p2 > s->size_in_bits || p2 - p1 < 16) |
| 83 | return -1; |
| 84 | if (av_crc(dca->crctab, 0xffff, s->buffer + p1 / 8, (p2 - p1) / 8)) |
| 85 | return -1; |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | static inline int ff_dca_seek_bits(GetBitContext *s, int p) |
| 90 | { |
| 91 | if (p < s->index || p > s->size_in_bits) |
| 92 | return -1; |
| 93 | s->index = p; |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | #endif |
| 98 |