nest-open-source / nest-client-apple-tv / 5.9.0 / ffmpeg / refs/heads/master / . / jaspertv_gpl_out / lib / ffmpeg / ffmpeg / libavcodec / mlp.h

/* | |

* MLP codec common header file | |

* Copyright (c) 2007-2008 Ian Caulfield | |

* | |

* 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_MLP_H | |

#define AVCODEC_MLP_H | |

#include <stdint.h> | |

#include "avcodec.h" | |

/** Last possible matrix channel for each codec */ | |

#define MAX_MATRIX_CHANNEL_MLP 5 | |

#define MAX_MATRIX_CHANNEL_TRUEHD 7 | |

/** Maximum number of channels in a valid stream. | |

* MLP : 5.1 + 2 noise channels -> 8 channels | |

* TrueHD: 7.1 -> 8 channels | |

*/ | |

#define MAX_CHANNELS 8 | |

/** Maximum number of matrices used in decoding; most streams have one matrix | |

* per output channel, but some rematrix a channel (usually 0) more than once. | |

*/ | |

#define MAX_MATRICES_MLP 6 | |

#define MAX_MATRICES_TRUEHD 8 | |

#define MAX_MATRICES 8 | |

/** Maximum number of substreams that can be decoded. | |

* MLP's limit is 2. TrueHD supports at least up to 3. | |

*/ | |

#define MAX_SUBSTREAMS 4 | |

/** which multiple of 48000 the maximum sample rate is */ | |

#define MAX_RATEFACTOR 4 | |

/** maximum sample frequency seen in files */ | |

#define MAX_SAMPLERATE (MAX_RATEFACTOR * 48000) | |

/** maximum number of audio samples within one access unit */ | |

#define MAX_BLOCKSIZE (40 * MAX_RATEFACTOR) | |

/** next power of two greater than MAX_BLOCKSIZE */ | |

#define MAX_BLOCKSIZE_POW2 (64 * MAX_RATEFACTOR) | |

/** number of allowed filters */ | |

#define NUM_FILTERS 2 | |

/** The maximum number of taps in IIR and FIR filters. */ | |

#define MAX_FIR_ORDER 8 | |

#define MAX_IIR_ORDER 4 | |

/** Code that signals end of a stream. */ | |

#define END_OF_STREAM 0xd234d234 | |

#define FIR 0 | |

#define IIR 1 | |

/** filter data */ | |

typedef struct FilterParams { | |

uint8_t order; ///< number of taps in filter | |

uint8_t shift; ///< Right shift to apply to output of filter. | |

int32_t state[MAX_FIR_ORDER]; | |

} FilterParams; | |

/** sample data coding information */ | |

typedef struct ChannelParams { | |

FilterParams filter_params[NUM_FILTERS]; | |

int32_t coeff[NUM_FILTERS][MAX_FIR_ORDER]; | |

int16_t huff_offset; ///< Offset to apply to residual values. | |

int32_t sign_huff_offset; ///< sign/rounding-corrected version of huff_offset | |

uint8_t codebook; ///< Which VLC codebook to use to read residuals. | |

uint8_t huff_lsbs; ///< Size of residual suffix not encoded using VLC. | |

} ChannelParams; | |

/** Tables defining the Huffman codes. | |

* There are three entropy coding methods used in MLP (four if you count | |

* "none" as a method). These use the same sequences for codes starting with | |

* 00 or 01, but have different codes starting with 1. | |

*/ | |

extern const uint8_t ff_mlp_huffman_tables[3][18][2]; | |

/** MLP uses checksums that seem to be based on the standard CRC algorithm, but | |

* are not (in implementation terms, the table lookup and XOR are reversed). | |

* We can implement this behavior using a standard av_crc on all but the | |

* last element, then XOR that with the last element. | |

*/ | |

uint8_t ff_mlp_checksum8 (const uint8_t *buf, unsigned int buf_size); | |

uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size); | |

/** Calculate an 8-bit checksum over a restart header -- a non-multiple-of-8 | |

* number of bits, starting two bits into the first byte of buf. | |

*/ | |

uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size); | |

/** XOR together all the bytes of a buffer. | |

* Does this belong in dspcontext? | |

*/ | |

uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size); | |

void ff_mlp_init_crc(void); | |

/** XOR four bytes into one. */ | |

static inline uint8_t xor_32_to_8(uint32_t value) | |

{ | |

value ^= value >> 16; | |

value ^= value >> 8; | |

return value; | |

} | |

typedef enum THDChannelModifier { | |

THD_CH_MODIFIER_NOTINDICATED = 0x0, | |

THD_CH_MODIFIER_STEREO = 0x0, // Stereo (not Dolby Surround) | |

THD_CH_MODIFIER_LTRT = 0x1, // Dolby Surround | |

THD_CH_MODIFIER_LBINRBIN = 0x2, // Dolby Headphone | |

THD_CH_MODIFIER_MONO = 0x3, // Mono or Dual Mono | |

THD_CH_MODIFIER_NOTSURROUNDEX = 0x1, // Not Dolby Digital EX | |

THD_CH_MODIFIER_SURROUNDEX = 0x2, // Dolby Digital EX | |

} THDChannelModifier; | |

#endif /* AVCODEC_MLP_H */ |