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Diffstat (limited to 'ffmpeg/libavcodec/mlp.h')
| -rw-r--r-- | ffmpeg/libavcodec/mlp.h | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/ffmpeg/libavcodec/mlp.h b/ffmpeg/libavcodec/mlp.h deleted file mode 100644 index d8d1292..0000000 --- a/ffmpeg/libavcodec/mlp.h +++ /dev/null @@ -1,127 +0,0 @@ -/* - * 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 3 - -/** 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; -} - -#endif /* AVCODEC_MLP_H */ |