| /* |
| * 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 "libavutil/channel_layout.h" |
| |
| #define SYNC_MLP 0xbb |
| #define SYNC_TRUEHD 0xba |
| |
| /** 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 PARAM_BLOCKSIZE (1 << 7) |
| #define PARAM_MATRIX (1 << 6) |
| #define PARAM_OUTSHIFT (1 << 5) |
| #define PARAM_QUANTSTEP (1 << 4) |
| #define PARAM_FIR (1 << 3) |
| #define PARAM_IIR (1 << 2) |
| #define PARAM_HUFFOFFSET (1 << 1) |
| #define PARAM_PRESENCE (1 << 0) |
| |
| #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]; |
| |
| int coeff_bits; |
| int coeff_shift; |
| } 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]; |
| |
| typedef struct { |
| uint8_t channel_occupancy; |
| uint8_t group1_channels; |
| uint8_t group2_channels; |
| uint8_t summary_info; |
| } ChannelInformation; |
| |
| /** Tables defining channel information. |
| * |
| * Possible channel arrangements are: |
| * |
| * (Group 1) C |
| * (Group 1) L, R |
| * (Group 1) Lf, Rf / (Group 2) S |
| * (Group 1) Lf, Rf / (Group 2) Ls, Rs |
| * (Group 1) Lf, Rf / (Group 2) LFE |
| * (Group 1) Lf, Rf / (Group 2) LFE, S |
| * (Group 1) Lf, Rf / (Group 2) LFE, Ls, Rs |
| * (Group 1) Lf, Rf / (Group 2) C |
| * (Group 1) Lf, Rf / (Group 2) C, S |
| * (Group 1) Lf, Rf / (Group 2) C, Ls, Rs |
| * (Group 1) Lf, Rf / (Group 2) C, LFE |
| * (Group 1) Lf, Rf / (Group 2) C, LFE, S |
| * (Group 1) Lf, Rf / (Group 2) C, LFE, Ls, Rs |
| * (Group 1) Lf, Rf C / (Group 2) S |
| * (Group 1) Lf, Rf C / (Group 2) Ls, Rs |
| * (Group 1) Lf, Rf C / (Group 2) LFE |
| * (Group 1) Lf, Rf C / (Group 2) LFE, S |
| * (Group 1) Lf, Rf C / (Group 2) LFE, Ls, Rs |
| * (Group 1) Lf, Rf Ls Rs / (Group 2) LFE |
| * (Group 1) Lf, Rf Ls Rs / (Group 2) C |
| * (Group 1) Lf, Rf, Ls, Rs / (Group 2) C, LFE |
| */ |
| extern const ChannelInformation ff_mlp_ch_info[21]; |
| |
| #if FF_API_OLD_CHANNEL_LAYOUT |
| extern const uint64_t ff_mlp_channel_layouts[12]; |
| #endif |
| extern const AVChannelLayout ff_mlp_ch_layouts[12]; |
| |
| /** 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 */ |
