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FFmpeg/libavcodec/dca.h
Andreas Rheinhardt 3afb41655e avcodec/dca: Unavpriv dca_sample_rates 
Said table is 64 bytes long and exported so that it can be used both
in libavcodec and libavformat. This commit stops doing so and instead
duplicates it for shared builds, because the overhead of exporting the
symbol is bigger than 64 bytes. It consists of the length of the name of
the symbol (2x24 bytes), two entries in .dynsym (2x24 bytes), two
entries for symbol version (2x2 bytes), one hash value in the exporting
library (4 bytes) in addition to one entry in the importing library's
.got and .rela.dyn (8 + 24 bytes).
(The above numbers are for a Linux/GNU/Elf system; the numbers for other
platforms may be different.)

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-01-04 13:16:49 +01:00

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8.6 KiB
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/*
* DCA compatible decoder
* Copyright (C) 2004 Gildas Bazin
* Copyright (C) 2004 Benjamin Zores
* Copyright (C) 2006 Benjamin Larsson
* Copyright (C) 2007 Konstantin Shishkov
* Copyright (C) 2016 foo86
*
* 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_DCA_H
#define AVCODEC_DCA_H
#include <stdint.h>
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "get_bits.h"
#define DCA_CORE_FRAME_HEADER_SIZE 18
enum DCAParseError {
DCA_PARSE_ERROR_SYNC_WORD = -1,
DCA_PARSE_ERROR_DEFICIT_SAMPLES = -2,
DCA_PARSE_ERROR_PCM_BLOCKS = -3,
DCA_PARSE_ERROR_FRAME_SIZE = -4,
DCA_PARSE_ERROR_AMODE = -5,
DCA_PARSE_ERROR_SAMPLE_RATE = -6,
DCA_PARSE_ERROR_RESERVED_BIT = -7,
DCA_PARSE_ERROR_LFE_FLAG = -8,
DCA_PARSE_ERROR_PCM_RES = -9,
};
typedef struct DCACoreFrameHeader {
uint8_t normal_frame; ///< Frame type
uint8_t deficit_samples; ///< Deficit sample count
uint8_t crc_present; ///< CRC present flag
uint8_t npcmblocks; ///< Number of PCM sample blocks
uint16_t frame_size; ///< Primary frame byte size
uint8_t audio_mode; ///< Audio channel arrangement
uint8_t sr_code; ///< Core audio sampling frequency
uint8_t br_code; ///< Transmission bit rate
uint8_t drc_present; ///< Embedded dynamic range flag
uint8_t ts_present; ///< Embedded time stamp flag
uint8_t aux_present; ///< Auxiliary data flag
uint8_t hdcd_master; ///< HDCD mastering flag
uint8_t ext_audio_type; ///< Extension audio descriptor flag
uint8_t ext_audio_present; ///< Extended coding flag
uint8_t sync_ssf; ///< Audio sync word insertion flag
uint8_t lfe_present; ///< Low frequency effects flag
uint8_t predictor_history; ///< Predictor history flag switch
uint8_t filter_perfect; ///< Multirate interpolator switch
uint8_t encoder_rev; ///< Encoder software revision
uint8_t copy_hist; ///< Copy history
uint8_t pcmr_code; ///< Source PCM resolution
uint8_t sumdiff_front; ///< Front sum/difference flag
uint8_t sumdiff_surround; ///< Surround sum/difference flag
uint8_t dn_code; ///< Dialog normalization / unspecified
} DCACoreFrameHeader;
enum DCASpeaker {
DCA_SPEAKER_C, DCA_SPEAKER_L, DCA_SPEAKER_R, DCA_SPEAKER_Ls,
DCA_SPEAKER_Rs, DCA_SPEAKER_LFE1, DCA_SPEAKER_Cs, DCA_SPEAKER_Lsr,
DCA_SPEAKER_Rsr, DCA_SPEAKER_Lss, DCA_SPEAKER_Rss, DCA_SPEAKER_Lc,
DCA_SPEAKER_Rc, DCA_SPEAKER_Lh, DCA_SPEAKER_Ch, DCA_SPEAKER_Rh,
DCA_SPEAKER_LFE2, DCA_SPEAKER_Lw, DCA_SPEAKER_Rw, DCA_SPEAKER_Oh,
DCA_SPEAKER_Lhs, DCA_SPEAKER_Rhs, DCA_SPEAKER_Chr, DCA_SPEAKER_Lhr,
DCA_SPEAKER_Rhr, DCA_SPEAKER_Cl, DCA_SPEAKER_Ll, DCA_SPEAKER_Rl,
DCA_SPEAKER_RSV1, DCA_SPEAKER_RSV2, DCA_SPEAKER_RSV3, DCA_SPEAKER_RSV4,
DCA_SPEAKER_COUNT
};
enum DCASpeakerMask {
DCA_SPEAKER_MASK_C = 0x00000001,
DCA_SPEAKER_MASK_L = 0x00000002,
DCA_SPEAKER_MASK_R = 0x00000004,
DCA_SPEAKER_MASK_Ls = 0x00000008,
DCA_SPEAKER_MASK_Rs = 0x00000010,
DCA_SPEAKER_MASK_LFE1 = 0x00000020,
DCA_SPEAKER_MASK_Cs = 0x00000040,
DCA_SPEAKER_MASK_Lsr = 0x00000080,
DCA_SPEAKER_MASK_Rsr = 0x00000100,
DCA_SPEAKER_MASK_Lss = 0x00000200,
DCA_SPEAKER_MASK_Rss = 0x00000400,
DCA_SPEAKER_MASK_Lc = 0x00000800,
DCA_SPEAKER_MASK_Rc = 0x00001000,
DCA_SPEAKER_MASK_Lh = 0x00002000,
DCA_SPEAKER_MASK_Ch = 0x00004000,
DCA_SPEAKER_MASK_Rh = 0x00008000,
DCA_SPEAKER_MASK_LFE2 = 0x00010000,
DCA_SPEAKER_MASK_Lw = 0x00020000,
DCA_SPEAKER_MASK_Rw = 0x00040000,
DCA_SPEAKER_MASK_Oh = 0x00080000,
DCA_SPEAKER_MASK_Lhs = 0x00100000,
DCA_SPEAKER_MASK_Rhs = 0x00200000,
DCA_SPEAKER_MASK_Chr = 0x00400000,
DCA_SPEAKER_MASK_Lhr = 0x00800000,
DCA_SPEAKER_MASK_Rhr = 0x01000000,
DCA_SPEAKER_MASK_Cl = 0x02000000,
DCA_SPEAKER_MASK_Ll = 0x04000000,
DCA_SPEAKER_MASK_Rl = 0x08000000,
};
#define DCA_SPEAKER_LAYOUT_MONO (DCA_SPEAKER_MASK_C)
#define DCA_SPEAKER_LAYOUT_STEREO (DCA_SPEAKER_MASK_L | DCA_SPEAKER_MASK_R)
#define DCA_SPEAKER_LAYOUT_2POINT1 (DCA_SPEAKER_LAYOUT_STEREO | DCA_SPEAKER_MASK_LFE1)
#define DCA_SPEAKER_LAYOUT_3_0 (DCA_SPEAKER_LAYOUT_STEREO | DCA_SPEAKER_MASK_C)
#define DCA_SPEAKER_LAYOUT_2_1 (DCA_SPEAKER_LAYOUT_STEREO | DCA_SPEAKER_MASK_Cs)
#define DCA_SPEAKER_LAYOUT_3_1 (DCA_SPEAKER_LAYOUT_3_0 | DCA_SPEAKER_MASK_Cs)
#define DCA_SPEAKER_LAYOUT_2_2 (DCA_SPEAKER_LAYOUT_STEREO | DCA_SPEAKER_MASK_Ls | DCA_SPEAKER_MASK_Rs)
#define DCA_SPEAKER_LAYOUT_5POINT0 (DCA_SPEAKER_LAYOUT_3_0 | DCA_SPEAKER_MASK_Ls | DCA_SPEAKER_MASK_Rs)
#define DCA_SPEAKER_LAYOUT_5POINT1 (DCA_SPEAKER_LAYOUT_5POINT0 | DCA_SPEAKER_MASK_LFE1)
#define DCA_SPEAKER_LAYOUT_7POINT0_WIDE (DCA_SPEAKER_LAYOUT_5POINT0 | DCA_SPEAKER_MASK_Lw | DCA_SPEAKER_MASK_Rw)
#define DCA_SPEAKER_LAYOUT_7POINT1_WIDE (DCA_SPEAKER_LAYOUT_7POINT0_WIDE | DCA_SPEAKER_MASK_LFE1)
#define DCA_HAS_STEREO(mask) \
((mask & DCA_SPEAKER_LAYOUT_STEREO) == DCA_SPEAKER_LAYOUT_STEREO)
enum DCASpeakerPair {
DCA_SPEAKER_PAIR_C = 0x0001,
DCA_SPEAKER_PAIR_LR = 0x0002,
DCA_SPEAKER_PAIR_LsRs = 0x0004,
DCA_SPEAKER_PAIR_LFE1 = 0x0008,
DCA_SPEAKER_PAIR_Cs = 0x0010,
DCA_SPEAKER_PAIR_LhRh = 0x0020,
DCA_SPEAKER_PAIR_LsrRsr = 0x0040,
DCA_SPEAKER_PAIR_Ch = 0x0080,
DCA_SPEAKER_PAIR_Oh = 0x0100,
DCA_SPEAKER_PAIR_LcRc = 0x0200,
DCA_SPEAKER_PAIR_LwRw = 0x0400,
DCA_SPEAKER_PAIR_LssRss = 0x0800,
DCA_SPEAKER_PAIR_LFE2 = 0x1000,
DCA_SPEAKER_PAIR_LhsRhs = 0x2000,
DCA_SPEAKER_PAIR_Chr = 0x4000,
DCA_SPEAKER_PAIR_LhrRhr = 0x8000
};
/**
* Return number of individual channels in DCASpeakerPair mask
*/
static inline int ff_dca_count_chs_for_mask(unsigned int mask)
{
return av_popcount((mask & 0xffff) | ((mask & 0xae66) << 16));
}
enum DCARepresentationType {
DCA_REPR_TYPE_LtRt = 2,
DCA_REPR_TYPE_LhRh = 3
};
enum DCAExtensionMask {
DCA_CSS_CORE = 0x001,
DCA_CSS_XXCH = 0x002,
DCA_CSS_X96 = 0x004,
DCA_CSS_XCH = 0x008,
DCA_CSS_MASK = 0x00f,
DCA_EXSS_CORE = 0x010,
DCA_EXSS_XBR = 0x020,
DCA_EXSS_XXCH = 0x040,
DCA_EXSS_X96 = 0x080,
DCA_EXSS_LBR = 0x100,
DCA_EXSS_XLL = 0x200,
DCA_EXSS_RSV1 = 0x400,
DCA_EXSS_RSV2 = 0x800,
DCA_EXSS_MASK = 0xff0,
};
enum DCADownMixType {
DCA_DMIX_TYPE_1_0,
DCA_DMIX_TYPE_LoRo,
DCA_DMIX_TYPE_LtRt,
DCA_DMIX_TYPE_3_0,
DCA_DMIX_TYPE_2_1,
DCA_DMIX_TYPE_2_2,
DCA_DMIX_TYPE_3_1,
DCA_DMIX_TYPE_COUNT
};
extern const uint32_t ff_dca_sample_rates[16];
extern const uint32_t ff_dca_sampling_freqs[16];
extern const uint8_t ff_dca_freq_ranges[16];
extern const uint8_t ff_dca_bits_per_sample[8];
/**
* Convert bitstream to one representation based on sync marker
*/
int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
int max_size);
/**
* Parse and validate core frame header
* @param[out] h Pointer to struct where header info is written.
* @param[in] buf Pointer to the data buffer
* @param[in] size Size of the data buffer
* @return 0 on success, negative AVERROR code on failure
*/
int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, const uint8_t *buf, int size);
/**
* Parse and validate core frame header
* @param[out] h Pointer to struct where header info is written.
* @param[in] gbc BitContext containing the first 120 bits of the frame.
* @return 0 on success, negative DCA_PARSE_ERROR_ code on failure
*/
int ff_dca_parse_core_frame_header(DCACoreFrameHeader *h, GetBitContext *gb);
#endif /* AVCODEC_DCA_H */
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