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15b86f480a
* Multichannel support for TrueHD is experimental
There should be downmix substreams present for 2+ channel bitstreams,
but ffmpeg decoder doesn't need it. Will add support for this soon.
* There might be lossless check failures on LFE channels
* 32-bit sample support has been removed for now, will add it later
While testing, some samples gave lossless check failures when enforcing
s32. Probably this will also get solved with the LFE issues.
Signed-off-by: Jai Luthra <me@jailuthra.in>
178 lines
6.2 KiB
C
178 lines
6.2 KiB
C
/*
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* MLP codec common header file
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* Copyright (c) 2007-2008 Ian Caulfield
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_MLP_H
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#define AVCODEC_MLP_H
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#include <stdint.h>
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#include "avcodec.h"
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/** Last possible matrix channel for each codec */
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#define MAX_MATRIX_CHANNEL_MLP 5
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#define MAX_MATRIX_CHANNEL_TRUEHD 7
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/** Maximum number of channels in a valid stream.
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* MLP : 5.1 + 2 noise channels -> 8 channels
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* TrueHD: 7.1 -> 8 channels
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*/
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#define MAX_CHANNELS 8
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/** Maximum number of matrices used in decoding; most streams have one matrix
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* per output channel, but some rematrix a channel (usually 0) more than once.
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*/
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#define MAX_MATRICES_MLP 6
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#define MAX_MATRICES_TRUEHD 8
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#define MAX_MATRICES 8
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/** Maximum number of substreams that can be decoded.
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* MLP's limit is 2. TrueHD supports at least up to 3.
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*/
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#define MAX_SUBSTREAMS 4
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/** which multiple of 48000 the maximum sample rate is */
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#define MAX_RATEFACTOR 4
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/** maximum sample frequency seen in files */
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#define MAX_SAMPLERATE (MAX_RATEFACTOR * 48000)
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/** maximum number of audio samples within one access unit */
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#define MAX_BLOCKSIZE (40 * MAX_RATEFACTOR)
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/** next power of two greater than MAX_BLOCKSIZE */
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#define MAX_BLOCKSIZE_POW2 (64 * MAX_RATEFACTOR)
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/** number of allowed filters */
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#define NUM_FILTERS 2
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/** The maximum number of taps in IIR and FIR filters. */
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#define MAX_FIR_ORDER 8
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#define MAX_IIR_ORDER 4
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/** Code that signals end of a stream. */
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#define END_OF_STREAM 0xd234d234
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#define FIR 0
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#define IIR 1
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/** filter data */
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typedef struct FilterParams {
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uint8_t order; ///< number of taps in filter
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uint8_t shift; ///< Right shift to apply to output of filter.
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int32_t state[MAX_FIR_ORDER];
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int coeff_bits;
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int coeff_shift;
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} FilterParams;
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/** sample data coding information */
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typedef struct ChannelParams {
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FilterParams filter_params[NUM_FILTERS];
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int32_t coeff[NUM_FILTERS][MAX_FIR_ORDER];
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int16_t huff_offset; ///< Offset to apply to residual values.
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int32_t sign_huff_offset; ///< sign/rounding-corrected version of huff_offset
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uint8_t codebook; ///< Which VLC codebook to use to read residuals.
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uint8_t huff_lsbs; ///< Size of residual suffix not encoded using VLC.
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} ChannelParams;
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/** Tables defining the Huffman codes.
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* There are three entropy coding methods used in MLP (four if you count
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* "none" as a method). These use the same sequences for codes starting with
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* 00 or 01, but have different codes starting with 1.
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*/
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extern const uint8_t ff_mlp_huffman_tables[3][18][2];
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typedef struct {
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uint8_t channel_occupancy;
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uint8_t group1_channels;
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uint8_t group2_channels;
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uint8_t summary_info;
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} ChannelInformation;
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/** Tables defining channel information.
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*
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* Possible channel arrangements are:
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*
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* (Group 1) C
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* (Group 1) L, R
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* (Group 1) Lf, Rf / (Group 2) S
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* (Group 1) Lf, Rf / (Group 2) Ls, Rs
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* (Group 1) Lf, Rf / (Group 2) LFE
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* (Group 1) Lf, Rf / (Group 2) LFE, S
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* (Group 1) Lf, Rf / (Group 2) LFE, Ls, Rs
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* (Group 1) Lf, Rf / (Group 2) C
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* (Group 1) Lf, Rf / (Group 2) C, S
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* (Group 1) Lf, Rf / (Group 2) C, Ls, Rs
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* (Group 1) Lf, Rf / (Group 2) C, LFE
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* (Group 1) Lf, Rf / (Group 2) C, LFE, S
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* (Group 1) Lf, Rf / (Group 2) C, LFE, Ls, Rs
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* (Group 1) Lf, Rf C / (Group 2) S
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* (Group 1) Lf, Rf C / (Group 2) Ls, Rs
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* (Group 1) Lf, Rf C / (Group 2) LFE
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* (Group 1) Lf, Rf C / (Group 2) LFE, S
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* (Group 1) Lf, Rf C / (Group 2) LFE, Ls, Rs
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* (Group 1) Lf, Rf Ls Rs / (Group 2) LFE
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* (Group 1) Lf, Rf Ls Rs / (Group 2) C
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* (Group 1) Lf, Rf, Ls, Rs / (Group 2) C, LFE
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*/
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extern const ChannelInformation ff_mlp_ch_info[21];
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extern const uint64_t ff_mlp_channel_layouts[12];
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/** MLP uses checksums that seem to be based on the standard CRC algorithm, but
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* are not (in implementation terms, the table lookup and XOR are reversed).
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* We can implement this behavior using a standard av_crc on all but the
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* last element, then XOR that with the last element.
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*/
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uint8_t ff_mlp_checksum8 (const uint8_t *buf, unsigned int buf_size);
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uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size);
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/** Calculate an 8-bit checksum over a restart header -- a non-multiple-of-8
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* number of bits, starting two bits into the first byte of buf.
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*/
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uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size);
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/** XOR together all the bytes of a buffer.
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* Does this belong in dspcontext?
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*/
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uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size);
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void ff_mlp_init_crc(void);
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/** XOR four bytes into one. */
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static inline uint8_t xor_32_to_8(uint32_t value)
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{
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value ^= value >> 16;
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value ^= value >> 8;
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return value;
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}
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typedef enum THDChannelModifier {
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THD_CH_MODIFIER_NOTINDICATED = 0x0,
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THD_CH_MODIFIER_STEREO = 0x0, // Stereo (not Dolby Surround)
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THD_CH_MODIFIER_LTRT = 0x1, // Dolby Surround
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THD_CH_MODIFIER_LBINRBIN = 0x2, // Dolby Headphone
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THD_CH_MODIFIER_MONO = 0x3, // Mono or Dual Mono
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THD_CH_MODIFIER_NOTSURROUNDEX = 0x1, // Not Dolby Digital EX
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THD_CH_MODIFIER_SURROUNDEX = 0x2, // Dolby Digital EX
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} THDChannelModifier;
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#endif /* AVCODEC_MLP_H */
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