bitstream reader API header. More...

#include <stdint.h>
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/avassert.h"
#include "mathops.h"

Include dependency graph for get_bits.h:

Go to the source code of this file.

Data Structures
struct	GetBitContext

struct	VLC

struct	RL_VLC_ELEM

Macros
#define	UNCHECKED_BITSTREAM_READER !CONFIG_SAFE_BITSTREAM_READER

#define	VLC_TYPE int16_t

#define	MIN_CACHE_BITS 25

#define	OPEN_READER(name, gb)

#define	HAVE_BITS_REMAINING(name, gb) 1

#define	CLOSE_READER(name, gb) (gb)->index = name ## _index

#define	UPDATE_CACHE(name, gb)

#define	SKIP_CACHE(name, gb, num) name ## _cache <<= (num)

#define	SKIP_COUNTER(name, gb, num) name ## _index += (num)

#define	SKIP_BITS(name, gb, num)

#define	LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)

#define	SHOW_UBITS(name, gb, num) NEG_USR32(name ## _cache, num)

#define	SHOW_SBITS(name, gb, num) NEG_SSR32(name ## _cache, num)

#define	GET_CACHE(name, gb) ((uint32_t) name ## _cache)

#define	init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)

#define	INIT_VLC_LE 2

#define	INIT_VLC_USE_NEW_STATIC 4

#define	INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)

#define	GET_VLC(code, name, gb, table, bits, max_depth)
	If the vlc code is invalid and max_depth=1, then no bits will be removed. More...

#define	GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)

#define	tprintf(p, ...) { }

Typedefs
typedef struct GetBitContext	GetBitContext

typedef struct VLC	VLC

typedef struct RL_VLC_ELEM	RL_VLC_ELEM

Functions
static int	get_bits_count (const GetBitContext *s)

static void	skip_bits_long (GetBitContext *s, int n)

static int	get_xbits (GetBitContext *s, int n)
	read mpeg1 dc style vlc (sign bit + mantisse with no MSB). More...

static int	get_sbits (GetBitContext *s, int n)

static unsigned int	get_bits (GetBitContext *s, int n)
	Read 1-25 bits. More...

static unsigned int	show_bits (GetBitContext *s, int n)
	Show 1-25 bits. More...

static void	skip_bits (GetBitContext *s, int n)

static unsigned int	get_bits1 (GetBitContext *s)

static unsigned int	show_bits1 (GetBitContext *s)

static void	skip_bits1 (GetBitContext *s)

static unsigned int	get_bits_long (GetBitContext *s, int n)
	Read 0-32 bits. More...

static uint64_t	get_bits64 (GetBitContext *s, int n)
	Read 0-64 bits. More...

static int	get_sbits_long (GetBitContext *s, int n)
	Read 0-32 bits as a signed integer. More...

static unsigned int	show_bits_long (GetBitContext *s, int n)
	Show 0-32 bits. More...

static int	check_marker (GetBitContext s, const char msg)

static int	init_get_bits (GetBitContext s, const uint8_t buffer, int bit_size)
	Initialize GetBitContext. More...

static int	init_get_bits8 (GetBitContext s, const uint8_t buffer, int byte_size)
	Initialize GetBitContext. More...

static const uint8_t *	align_get_bits (GetBitContext *s)

int	ff_init_vlc_sparse (VLC vlc, int nb_bits, int nb_codes, const void bits, int bits_wrap, int bits_size, const void codes, int codes_wrap, int codes_size, const void symbols, int symbols_wrap, int symbols_size, int flags)

void	ff_free_vlc (VLC *vlc)

static av_always_inline int	get_vlc2 (GetBitContext s, VLC_TYPE(table)[2], int bits, int max_depth)
	Parse a vlc code. More...

static int	decode012 (GetBitContext *gb)

static int	decode210 (GetBitContext *gb)

static int	get_bits_left (GetBitContext *gb)

Detailed Description

bitstream reader API header.

Definition in file get_bits.h.

Macro Definition Documentation

#define CLOSE_READER	(	name,
		gb
	)	(gb)->index = name ## _index

Definition at line 140 of file get_bits.h.

Referenced by decode_ac_coeffs(), decode_block(), decode_block_intra(), decode_block_progressive(), decode_block_refinement(), decode_dc_coeffs(), decode_spectrum_and_dequant(), decode_vlc_codeword(), dirac_get_se_golomb(), dnxhd_decode_dct_block(), dv_decode_ac(), ff_msmpeg4_decode_block(), get_bits(), get_level_prefix(), get_sbits(), get_se_golomb(), get_ue_golomb(), get_ue_golomb_31(), get_ur_golomb(), get_ur_golomb_jpegls(), get_vlc2(), get_xbits(), mdec_decode_block_intra(), mpeg1_decode_block_inter(), mpeg1_decode_block_intra(), mpeg1_fast_decode_block_inter(), mpeg2_decode_block_intra(), mpeg2_decode_block_non_intra(), mpeg2_fast_decode_block_intra(), mpeg2_fast_decode_block_non_intra(), mpeg4_decode_block(), read_argb_line(), read_rgb24_component_line(), skip_bits(), svq3_get_se_golomb(), and svq3_get_ue_golomb().

#define GET_CACHE	(	name,
		gb
	)	((uint32_t) name ## _cache)

#define GET_RL_VLC	(	level,
		run,
		name,
		gb,
		table,
		bits,
		max_depth,
		need_update
	)

Value:

do {                                                        \
        int n, nb_bits;                                         \
        unsigned int index;                                     \
                                                                \
        index = SHOW_UBITS(name, gb, bits);                     \
        level = table[index].level;                             \
        n     = table[index].len;                               \
                                                                \
        if (max_depth > 1 && n < 0) {                           \
            SKIP_BITS(name, gb, bits);                          \
            if (need_update) {                                  \
                UPDATE_CACHE(name, gb);                         \
            }                                                   \
                                                                \
            nb_bits = -n;                                       \
                                                                \
            index = SHOW_UBITS(name, gb, nb_bits) + level;      \
            level = table[index].level;                         \
            n     = table[index].len;                           \
        }                                                       \
        run = table[index].run;                                 \
        SKIP_BITS(name, gb, n);                                 \
    } while (0)

Definition at line 490 of file get_bits.h.

Referenced by decode_block_intra(), ff_msmpeg4_decode_block(), mdec_decode_block_intra(), mpeg1_decode_block_inter(), mpeg1_decode_block_intra(), mpeg1_fast_decode_block_inter(), mpeg2_decode_block_intra(), mpeg2_decode_block_non_intra(), mpeg2_fast_decode_block_intra(), mpeg2_fast_decode_block_non_intra(), and mpeg4_decode_block().

#define GET_VLC	(	code,
		name,
		gb,
		table,
		bits,
		max_depth
	)

Value:

do {                                                        \
        int n, nb_bits;                                         \
        unsigned int index;                                     \
                                                                \
        index = SHOW_UBITS(name, gb, bits);                     \
        code  = table[index][0];                                \
        n     = table[index][1];                                \
                                                                \
        if (max_depth > 1 && n < 0) {                           \
            LAST_SKIP_BITS(name, gb, bits);                     \
            UPDATE_CACHE(name, gb);                             \
                                                                \
            nb_bits = -n;                                       \
                                                                \
            index = SHOW_UBITS(name, gb, nb_bits) + code;       \
            code  = table[index][0];                            \
            n     = table[index][1];                            \
            if (max_depth > 2 && n < 0) {                       \
                LAST_SKIP_BITS(name, gb, nb_bits);              \
                UPDATE_CACHE(name, gb);                         \
                                                                \
                nb_bits = -n;                                   \
                                                                \
                index = SHOW_UBITS(name, gb, nb_bits) + code;   \
                code  = table[index][0];                        \
                n     = table[index][1];                        \
            }                                                   \
        }                                                       \
        SKIP_BITS(name, gb, n);                                 \
    } while (0)

If the vlc code is invalid and max_depth=1, then no bits will be removed.

If the vlc code is invalid and max_depth>1, then the number of bits removed is undefined.

Definition at line 458 of file get_bits.h.

Referenced by decode_block(), decode_block_progressive(), decode_block_refinement(), decode_spectrum_and_dequant(), dnxhd_decode_dct_block(), get_vlc2(), read_argb_line(), and read_rgb24_component_line().

#define HAVE_BITS_REMAINING	(	name,
		gb
	)	1

Definition at line 130 of file get_bits.h.

Referenced by svq3_get_ue_golomb().

#define init_vlc	(	vlc,
		nb_bits,
		nb_codes,
		bits,
		bits_wrap,
		bits_size,
		codes,
		codes_wrap,
		codes_size,
		flags
	)

Value:

ff_init_vlc_sparse(vlc, nb_bits, nb_codes,          \
                       bits, bits_wrap, bits_size,      \
                       codes, codes_wrap, codes_size,   \
                       NULL, 0, 0, flags)

Definition at line 426 of file get_bits.h.

Referenced by atrac3_init_static_data(), dca_init_vlcs(), decode_init(), decode_init_static(), decode_rle(), dnxhd_init_vlc(), ff_dvvideo_init(), ff_h264_decode_init_vlc(), ff_vc1_init_common(), generate_joint_tables(), imc_decode_init(), init_coef_vlc(), init_cook_vlc_tables(), init_vlcs(), ir2_decode_init(), ivi_create_huff_from_desc(), mimic_decode_init(), mp_decode_frame(), mpc7_decode_init(), mpc8_decode_init(), qdm2_init_vlc(), read_huffman_tables(), read_old_huffman_tables(), rv40_init_tables(), smacker_decode_header_tree(), smka_decode_frame(), svq1_decode_init(), tm2_build_huff_table(), vorbis_parse_setup_hdr_codebooks(), vp3_decode_init(), and wma_decode_init().

#define INIT_VLC_LE 2

Definition at line 442 of file get_bits.h.

Referenced by build_table(), decode_init(), init_vlcs(), ir2_decode_init(), ivi_create_huff_from_desc(), qdm2_init_vlc(), smacker_decode_header_tree(), smka_decode_frame(), and vorbis_parse_setup_hdr_codebooks().

#define INIT_VLC_STATIC	(	vlc,
		bits,
		a,
		b,
		c,
		d,
		e,
		f,
		g,
		static_size
	)

Value:

do {                                                                   \
        static VLC_TYPE table[static_size][2];                             \
        (vlc)->table           = table;                                    \
        (vlc)->table_allocated = static_size;                              \
        init_vlc(vlc, bits, a, b, c, d, e, f, g, INIT_VLC_USE_NEW_STATIC); \
    } while (0)

Definition at line 445 of file get_bits.h.

Referenced by aac_decode_init(), decode_init(), decode_vbmtree(), ff_ccitt_unpack_init(), ff_h263_decode_init_vlc(), ff_mpeg12_init_vlcs(), ff_mpeg4videodec_static_init(), ff_msmpeg4_decode_init(), ff_vc1_init_common(), h261_decode_init_vlc(), init_static(), init_vlcs(), rv10_decode_init(), and svq1_decode_init().

#define INIT_VLC_USE_NEW_STATIC 4

#define LAST_SKIP_BITS	(	name,
		gb,
		num
	)	SKIP_COUNTER(name, gb, num)

#define MIN_CACHE_BITS 25

Definition at line 122 of file get_bits.h.

Referenced by bit_copy(), decode_block(), decode_block_progressive(), ff_wma_init(), get_bits_long(), get_ur_golomb_jpegls(), mss2_decode_frame(), show_bits_long(), tgv_decode_inter(), and tta_decode_frame().

#define OPEN_READER	(	name,
		gb
	)

Value:

unsigned int name ## _index = (gb)->index; \

unsigned int av_unused name ## _cache

name

const char * name

Definition: avisynth_c.h:675

index

int index

Definition: gxfenc.c:89

av_unused

#define av_unused

Definition: attributes.h:114

Definition at line 126 of file get_bits.h.

Referenced by decode_ac_coeffs(), decode_block(), decode_block_intra(), decode_block_progressive(), decode_block_refinement(), decode_dc_coeffs(), decode_spectrum_and_dequant(), decode_vlc_codeword(), dirac_get_se_golomb(), dnxhd_decode_dct_block(), dv_decode_ac(), ff_msmpeg4_decode_block(), get_bits(), get_level_prefix(), get_sbits(), get_se_golomb(), get_ue_golomb(), get_ue_golomb_31(), get_ur_golomb(), get_ur_golomb_jpegls(), get_vlc2(), get_xbits(), mdec_decode_block_intra(), mpeg1_decode_block_inter(), mpeg1_decode_block_intra(), mpeg1_fast_decode_block_inter(), mpeg2_decode_block_intra(), mpeg2_decode_block_non_intra(), mpeg2_fast_decode_block_intra(), mpeg2_fast_decode_block_non_intra(), mpeg4_decode_block(), read_argb_line(), read_rgb24_component_line(), show_bits(), skip_bits(), svq3_get_se_golomb(), and svq3_get_ue_golomb().

#define SHOW_SBITS	(	name,
		gb,
		num
	)	NEG_SSR32(name ## _cache, num)

Definition at line 188 of file get_bits.h.

Referenced by decode_ac_coeffs(), decode_block_intra(), dirac_get_se_golomb(), dnxhd_decode_dct_block(), ff_msmpeg4_decode_block(), get_sbits(), mdec_decode_block_intra(), mpeg1_decode_block_inter(), mpeg1_decode_block_intra(), mpeg1_fast_decode_block_inter(), mpeg2_decode_block_intra(), mpeg2_decode_block_non_intra(), mpeg2_fast_decode_block_intra(), mpeg2_fast_decode_block_non_intra(), and mpeg4_decode_block().

#define SHOW_UBITS	(	name,
		gb,
		num
	)	NEG_USR32(name ## _cache, num)

#define SKIP_BITS	(	name,
		gb,
		num
	)

Value:

do {                                        \
        SKIP_CACHE(name, gb, num);              \
        SKIP_COUNTER(name, gb, num);            \
    } while (0)

Definition at line 175 of file get_bits.h.

Referenced by decode_ac_coeffs(), decode_block_intra(), decode_spectrum_and_dequant(), dnxhd_decode_dct_block(), ff_msmpeg4_decode_block(), get_ur_golomb_jpegls(), mdec_decode_block_intra(), mpeg1_decode_block_inter(), mpeg1_decode_block_intra(), mpeg1_fast_decode_block_inter(), mpeg2_decode_block_intra(), mpeg2_decode_block_non_intra(), mpeg2_fast_decode_block_intra(), mpeg2_fast_decode_block_non_intra(), and mpeg4_decode_block().

#define SKIP_CACHE	(	name,
		gb,
		num
	)	name ## _cache <<= (num)

Definition at line 164 of file get_bits.h.

Referenced by ff_msmpeg4_decode_block(), and mpeg4_decode_block().

#define SKIP_COUNTER	(	name,
		gb,
		num
	)	name ## _index += (num)

Definition at line 169 of file get_bits.h.

Referenced by ff_msmpeg4_decode_block(), and mpeg4_decode_block().

#define tprintf	(	p,
		...
	)	{ }

#define UNCHECKED_BITSTREAM_READER !CONFIG_SAFE_BITSTREAM_READER

Definition at line 51 of file get_bits.h.

#define UPDATE_CACHE	(	name,
		gb
	)

Value:

name ## _cache = \

AV_RB32((gb)->buffer + (name ## _index >> 3)) << (name ## _index & 7)

name

const char * name

Definition: avisynth_c.h:675

AV_RB32

#define AV_RB32

Definition: avr32/intreadwrite.h:130

buffer

the buffer and buffer reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFilterBuffer structures They must not be accessed but through references stored in AVFilterBufferRef structures Several references can point to the same buffer

Definition: filter_design.txt:45

Definition at line 160 of file get_bits.h.

Referenced by decode_ac_coeffs(), decode_block(), decode_block_intra(), decode_block_progressive(), decode_block_refinement(), decode_spectrum_and_dequant(), decode_vlc_codeword(), dirac_get_se_golomb(), dnxhd_decode_dct_block(), dv_decode_ac(), ff_msmpeg4_decode_block(), get_bits(), get_level_prefix(), get_sbits(), get_se_golomb(), get_ue_golomb(), get_ue_golomb_31(), get_ur_golomb(), get_ur_golomb_jpegls(), get_vlc2(), get_xbits(), mdec_decode_block_intra(), mpeg1_decode_block_inter(), mpeg1_decode_block_intra(), mpeg1_fast_decode_block_inter(), mpeg2_decode_block_intra(), mpeg2_decode_block_non_intra(), mpeg2_fast_decode_block_intra(), mpeg2_fast_decode_block_non_intra(), mpeg4_decode_block(), read_argb_line(), read_rgb24_component_line(), show_bits(), skip_bits(), svq3_get_se_golomb(), and svq3_get_ue_golomb().

#define VLC_TYPE int16_t

Definition at line 61 of file get_bits.h.

Referenced by alloc_table(), build_table(), dca_init_vlcs(), decode_init(), decode_spectrum_and_dequant(), ff_ccitt_unpack_init(), ff_ivi_init_static_vlc(), ff_vc1_init_common(), get_bits_left(), init_vlcs(), ir2_decode_init(), mpc7_decode_init(), mpc8_decode_init(), qdm2_init_vlc(), read_sbr_envelope(), read_sbr_noise(), rv40_init_tables(), svq1_decode_init(), unpack_vlcs(), and x8_vlc_init().

Typedef Documentation

typedef struct GetBitContext GetBitContext

typedef struct RL_VLC_ELEM RL_VLC_ELEM

typedef struct VLC VLC

Function Documentation

static const uint8_t* align_get_bits ( GetBitContext * s )

inlinestatic

Definition at line 418 of file get_bits.h.

Referenced by avpriv_copy_pce_data(), avs_decode_frame(), decode_band(), decode_band_hdr(), decode_component(), decode_frame(), decode_gop_header(), decode_lowdelay(), decode_mb_info(), decode_pce(), decode_pic_hdr(), decode_rle(), decode_slice(), dirac_unpack_block_motion_data(), dirac_unpack_idwt_params(), dirac_unpack_prediction_parameters(), ff_ccitt_unpack(), ff_dirac_init_arith_decoder(), ff_h261_resync(), ff_h263_decode_picture_header(), ff_h263_resync(), ff_h264_decode_mb_cavlc(), ff_h264_decode_sei(), ff_jpegls_decode_picture(), ff_lag_rac_init(), ff_mjpeg_decode_sos(), ff_mpeg4_decode_picture_header(), ff_tak_decode_frame_header(), handle_rstn(), ivi_dec_tile_data_size(), ivi_decode_blocks(), ljpeg_decode_rgb_scan(), ljpeg_decode_yuv_scan(), mp_decode_frame(), mpeg4_is_resync(), mpeg_decode_slice(), mss2_decode_frame(), predictor_calc_error(), read_channel_data(), read_frame_data(), read_specific_config(), read_var_block_data(), skip_data_stream_element(), tak_decode_frame(), tta_decode_frame(), and wma_decode_block().

static int check_marker	(	GetBitContext *	s,
		const char *	msg
	)

inlinestatic

Definition at line 362 of file get_bits.h.

Referenced by decode_vol_header(), decode_vop_header(), and ff_mpeg4_decode_video_packet_header().

static int decode012 ( GetBitContext * gb )

inlinestatic

Definition at line 539 of file get_bits.h.

Referenced by ff_msmpeg4_decode_picture_header(), ff_vc1_parse_frame_header(), ff_vc1_parse_frame_header_adv(), ff_wmv2_decode_mb(), ff_wmv2_decode_secondary_picture_header(), msmpeg4v34_decode_mb(), mss4_decode_frame(), vc1_decode_b_mb(), vc1_decode_b_mb_intfi(), vc1_decode_b_mb_intfr(), vc1_decode_p_block(), and wmv2_decode_inter_block().

static int decode210 ( GetBitContext * gb )

inlinestatic

Definition at line 549 of file get_bits.h.

Referenced by decode_mb(), ff_vc1_parse_frame_header_adv(), and vc1_decode_ac_coeff().

int ff_init_vlc_sparse	(	VLC *	vlc,
		int	nb_bits,
		int	nb_codes,
		const void *	bits,
		int	bits_wrap,
		int	bits_size,
		const void *	codes,
		int	codes_wrap,
		int	codes_size,
		const void *	symbols,
		int	symbols_wrap,
		int	symbols_size,
		int	flags
	)

Definition at line 262 of file bitstream.c.

Referenced by build_huff(), build_huff_tree(), build_vlc(), ff_ccitt_unpack_init(), ff_init_vlc_sparse(), generate_joint_tables(), init_ralf_vlc(), init_vlcs(), mpc8_decode_init(), mss4_init_vlc(), read_code_table(), rv34_gen_vlc(), and rv40_init_tables().

static unsigned int get_bits	(	GetBitContext *	s,
		int	n
	)

inlinestatic

Read 1-25 bits.

Definition at line 240 of file get_bits.h.

static unsigned int get_bits1 ( GetBitContext * s )

inlinestatic

Definition at line 273 of file get_bits.h.

Referenced by ac3_parse_header(), arith_normalise(), avpriv_aac_parse_header(), avpriv_ac3_parse_header(), avpriv_mpeg4audio_get_config(), avpriv_tak_parse_streaminfo(), avs_decode_frame(), aw_pulse_set2(), bink_decode_plane(), binkb_decode_plane(), bitline2chunky(), bitplanar2chunky(), bitplane_decoding(), check_bits_for_superframe(), check_marker(), codeblock(), coeff_unpack_golomb(), dca_exss_parse_asset_header(), dca_exss_parse_header(), dca_parse_audio_coding_header(), dca_xbr_parse_frame(), decode(), decode012(), decode210(), decode2x2(), decode4x4(), decode8x8(), decode_audio_block(), decode_band(), decode_band_hdr(), decode_band_structure(), decode_block(), decode_cce(), decode_cdlms(), decode_channel_map(), decode_channel_residues(), decode_channel_transform(), decode_coeff(), decode_coeffs(), decode_colskip(), decode_cpe(), decode_decorrelation_matrix(), decode_drc_channel_exclusions(), decode_dynamic_range(), decode_element(), decode_ext_header(), decode_frame(), decode_ga_specific_config(), decode_gain_info(), decode_gop_header(), decode_header_trees(), decode_hrd_parameters(), decode_ics(), decode_ics_info(), decode_line(), decode_ltp(), decode_macroblock(), decode_mb_i(), decode_mb_info(), decode_mb_p(), decode_mclms(), decode_mid_side_stereo(), decode_motion(), decode_mv_component(), decode_packet(), decode_pce(), decode_pic(), decode_pic_hdr(), decode_prediction(), decode_residual(), decode_residues(), decode_rice(), decode_rle(), decode_rowskip(), decode_run_8bit(), decode_scale_factors(), decode_scaling_list(), decode_scaling_matrices(), decode_segment(), decode_seq_header(), decode_sequence_header_adv(), decode_skip_count(), decode_slice_header(), decode_spectrum(), decode_subframe(), decode_subframe_length(), decode_tilehdr(), decode_tns(), decode_tonal_components(), decode_vol_header(), decode_vop_header(), decode_vui_parameters(), decorrelate(), decouple_info(), dequant(), dirac_unpack_idwt_params(), dirac_unpack_prediction_parameters(), dv_decode_video_segment(), dvbsub_read_2bit_string(), dvbsub_read_4bit_string(), escape124_decode_frame(), escape130_decode_frame(), ff_bgmc_decode(), ff_ccitt_unpack(), ff_decode_sbr_extension(), ff_eac3_decode_transform_coeffs_aht_ch(), ff_eac3_parse_header(), ff_flac_decode_frame_header(), ff_flv2_decode_ac_esc(), ff_flv_decode_picture_header(), ff_h263_decode_mb(), ff_h263_decode_motion(), ff_h263_decode_picture_header(), ff_h264_decode_mb_cavlc(), ff_h264_decode_picture_parameter_set(), ff_h264_decode_ref_pic_list_reordering(), ff_h264_decode_ref_pic_marking(), ff_h264_decode_seq_parameter_set(), ff_intel_h263_decode_picture_header(), ff_intrax8_decode_picture(), ff_mlp_read_major_sync(), ff_mpeg4_decode_video_packet_header(), ff_msmpeg4_decode_ext_header(), ff_msmpeg4_decode_picture_header(), ff_ps_read_data(), ff_rdt_parse_header(), ff_rv_decode_dc(), ff_vc1_decode_blocks(), ff_vc1_decode_entry_point(), ff_vc1_decode_sequence_header(), ff_vc1_parse_frame_header(), ff_vc1_parse_frame_header_adv(), ff_vorbis_len2vlc(), ff_wma_get_large_val(), ff_wma_run_level_decode(), ff_wmv2_decode_mb(), ff_wmv2_decode_picture_header(), ff_wmv2_decode_secondary_picture_header(), fill_slice(), find_group3_syncmarker(), flashsv_decode_frame(), gb_get_v(), get_bits1_vector(), get_bits_esc4(), get_dimension(), get_dmv(), get_float(), get_tail(), get_te0_golomb(), get_te_golomb(), get_unary(), get_value_cached(), h261_decode_block(), h261_decode_gob_header(), h261_decode_picture_header(), h261_probe(), h263_decode_block(), h263_decode_dquant(), h263_decode_gob_header(), h263_get_modb(), h263p_decode_umotion(), huffman_decode(), idx_to_quant(), imc_decode_block(), imc_get_skip_coeff(), init_tone_level_dequantization(), intlist_read(), ivi_dec_tile_data_size(), lag_decode_prob(), ls_decode_line(), merge(), mjpeg_decode_scan(), mov_write_ac3_tag(), mov_write_dvc1_structs(), mp_decode_layer3(), mp_get_code(), mpc7_decode_frame(), mpc7_decode_init(), mpc8_dec_base(), mpc8_decode_frame(), mpc8_decode_init(), mpeg1_decode_picture(), mpeg1_decode_sequence(), mpeg4_decode_dc(), mpeg4_decode_mb(), mpeg4_decode_partition_a(), mpeg4_decode_partition_b(), mpeg4_is_resync(), mpeg_decode_gop(), mpeg_decode_mb(), mpeg_decode_motion(), mpeg_decode_picture_coding_extension(), mpeg_decode_quant_matrix_extension(), mpeg_decode_sequence_display_extension(), mpeg_decode_sequence_extension(), mpeg_decode_slice(), msmpeg4_decode_dc(), msmpeg4v12_decode_mb(), msmpeg4v2_decode_motion(), msmpeg4v34_decode_mb(), mss2_decode_frame(), mss4_decode_image_block(), parse_mb_skip(), parse_nal_units(), parse_packet_header(), parse_setup_header(), parse_source_parameters(), pred_weight_table(), predictor_calc_error(), preview_obmc(), ps_read_extension_data(), qdm2_fft_decode_tones(), qt_rtp_parse_packet(), read_access_unit(), read_and_decode_spectrum(), read_block(), read_block_types(), read_channel_data(), read_channel_params(), read_colors(), read_const_block_data(), read_dcs(), read_dct_coeffs(), read_decoding_params(), read_filter_params(), read_frame_data(), read_huff_channels(), read_huffman_tree(), read_matrix_params(), read_motion_values(), read_residue(), read_restart_header(), read_runs(), read_sbr_channel_pair_element(), read_sbr_data(), read_sbr_grid(), read_sbr_header(), read_sbr_single_channel_element(), read_sl_header(), read_specific_config(), read_tree(), read_var_block_data(), read_vec_pos(), rv10_decode_picture_header(), rv20_decode_picture_header(), rv30_parse_slice_header(), rv34_decode_cbp(), rv34_decode_intra_mb_header(), rv40_decode_intra_types(), rv40_parse_slice_header(), skip_data_stream_element(), smacker_decode_bigtree(), smacker_decode_header_tree(), smacker_decode_tree(), smk_get_code(), smka_decode_frame(), svq1_decode_frame_header(), svq1_decode_motion_vector(), svq3_decode_init(), svq3_decode_mb(), svq3_decode_slice_header(), synth_block_fcb_acb(), synth_superframe(), synthfilt_build_sb_samples(), tak_decode_frame(), tm2_read_tree(), truespeech_read_frame(), tscc2_decode_mb(), tta_get_unary(), unpack_bitstream(), unpack_block_qpis(), unpack_frame(), unpack_SQVH(), unpack_superblocks(), unpack_vectors(), vaapi_mpeg2_decode_slice(), vble_unpack(), vc1_decode_ac_coeff(), vc1_decode_b_mb(), vc1_decode_b_mb_intfi(), vc1_decode_b_mb_intfr(), vc1_decode_frame(), vc1_decode_i_block(), vc1_decode_i_block_adv(), vc1_decode_i_blocks(), vc1_decode_i_blocks_adv(), vc1_decode_intra_block(), vc1_decode_p_mb(), vc1_decode_p_mb_intfi(), vc1_decode_p_mb_intfr(), vc1_pred_b_mv(), vc1_pred_mv(), vop_dquant_decoding(), vorbis_floor1_decode(), vorbis_parse_audio_packet(), vorbis_parse_id_hdr(), vorbis_parse_setup_hdr(), vorbis_parse_setup_hdr_codebooks(), vorbis_parse_setup_hdr_mappings(), vorbis_parse_setup_hdr_modes(), vorbis_parse_setup_hdr_residues(), vp3_decode_frame(), vp3_init_thread_copy(), vp6_get_nb_null(), vp6_parse_coeff_huffman(), wma_decode_block(), wmv2_decode_motion(), wmv2_pred_motion(), wv_get_value(), wv_get_value_float(), x8_decode_intra_mb(), x8_get_ac_rlf(), and xan_huffman_decode().

static uint64_t get_bits64	(	GetBitContext *	s,
		int	n
	)

inlinestatic

Read 0-64 bits.

Definition at line 326 of file get_bits.h.

Referenced by avpriv_flac_parse_streaminfo(), avpriv_tak_parse_streaminfo(), get_ts64(), and tak_read_header().

static int get_bits_count ( const GetBitContext * s )

inlinestatic

Definition at line 193 of file get_bits.h.

Referenced by aac_adtstoasc_filter(), aac_decode_frame(), adpcm_swf_decode(), alac_decode_frame(), align_get_bits(), avpriv_mpeg4audio_get_config(), bink_decode_plane(), binkb_decode_plane(), categorize(), check_bits_for_superframe(), check_for_slice(), cook_decode_frame(), dca_decode_frame(), dca_exss_parse_asset_header(), dca_exss_parse_header(), dca_parse_audio_coding_header(), dca_xbr_parse_frame(), dca_xxch_decode_frame(), decode_audio_specific_config(), decode_band(), decode_component(), decode_frame(), decode_gain_info(), decode_line(), decode_lowdelay(), decode_lowdelay_slice(), decode_packet(), decode_rle(), decode_slice(), decode_subframe(), decode_user_data(), decode_vol_header(), dvbsub_read_2bit_string(), dvbsub_read_4bit_string(), encode_picture_ls(), escape124_decode_frame(), escape130_decode_frame(), ff_dirac_init_arith_decoder(), ff_flac_decode_frame_header(), ff_h263_decode_frame(), ff_h263_resync(), ff_h264_decode_picture_parameter_set(), ff_lag_rac_init(), ff_mjpeg_decode_frame(), ff_mlp_read_major_sync(), ff_mpeg4_decode_picture_header(), ff_mpeg4_decode_video_packet_header(), ff_msmpeg4_decode_ext_header(), ff_ps_read_data(), ff_rdt_parse_header(), ff_rtjpeg_decode_frame_yuv420(), ff_vc1_decode_blocks(), fill_slice(), fill_slice_long(), find_group3_syncmarker(), flac_decode_frame(), flashsv_decode_block(), flashsv_decode_frame(), get_bits_align32(), get_bits_left(), get_consumed_bytes(), get_level_prefix(), get_sr_golomb_shorten(), handle_rstn(), huffman_decode(), imc_decode_block(), imc_get_coeffs(), latm_decode_audio_specific_config(), loco_decode_plane(), lowdelay_subband(), mp_decode_frame(), mp_decode_layer3(), mpc7_decode_frame(), mpc8_decode_frame(), mpeg4_is_resync(), mpeg_decode_slice(), mss2_decode_frame(), mxpeg_decode_frame(), parse_bintree(), parse_setup_header(), predictor_calc_error(), ps_read_extension_data(), qdm2_decode_sub_packet_header(), qdm2_decode_super_block(), qt_rtp_parse_packet(), read_access_unit(), read_block_data(), read_huffman_tables(), read_restart_header(), read_sbr_data(), read_sbr_header(), read_sl_header(), remaining_bits(), rv10_decode_packet(), save_bits(), seq_unpack_rle_block(), shorten_decode_frame(), svq3_decode_frame(), svq3_decode_init(), svq3_decode_slice_header(), switch_buffer(), tak_decode_frame(), tak_parse(), tm2_read_stream(), unpack_SQVH(), vaapi_h264_decode_slice(), vaapi_mpeg2_decode_slice(), vaapi_mpeg4_decode_slice(), vaapi_vc1_decode_slice(), vc1_decode_b_blocks(), vc1_decode_frame(), vc1_decode_i_blocks(), vc1_decode_i_blocks_adv(), vc1_decode_init(), vc1_decode_p_blocks(), vorbis_decode_frame(), vorbis_floor1_decode(), vp3_init_thread_copy(), wma_decode_superframe(), and wmavoice_decode_packet().

static int get_bits_left ( GetBitContext * gb )

inlinestatic

Definition at line 557 of file get_bits.h.

Referenced by aac_decode_frame_int(), alac_decode_frame(), ape_decode_value_3860(), avpriv_mpeg4audio_get_config(), bit_copy(), can_safely_read(), check_bits_for_superframe(), check_slice_end(), copy_bits(), dca_exss_parse_asset_header(), dca_exss_parse_header(), dca_subframe_header(), dca_subsubframe(), decode_422_bitstream(), decode_ac_coeffs(), decode_band_types(), decode_block(), decode_channel(), decode_channel_residues(), decode_component(), decode_element(), decode_frame(), decode_gray_bitstream(), decode_i_block(), decode_lowdelay(), decode_lowdelay_slice(), decode_mb(), decode_pce(), decode_plane(), decode_rice(), decode_skip_count(), decode_slice(), decode_subframe(), decode_vop_header(), decode_vui_parameters(), dv_decode_video_segment(), escape130_decode_frame(), ff_dirac_init_arith_decoder(), ff_h261_resync(), ff_h263_decode_frame(), ff_h263_decode_mb(), ff_h263_decode_picture_header(), ff_h263_resync(), ff_h264_decode_sei(), ff_ivi_decode_frame(), ff_lag_rac_init(), ff_mjpeg_decode_sos(), ff_msmpeg4_decode_block(), flashsv_decode_frame(), fraps2_decode_plane(), g726_reset(), get_block(), get_rice_ook(), get_ts64(), h261_decode_mb(), h261_decode_picture_header(), h263_decode_gob_header(), h263_handle_packet(), handle_rstn(), init_quantized_coeffs_elem0(), init_tone_level_dequantization(), latm_decode_audio_specific_config(), mjpeg_decode_app(), mjpeg_decode_com(), mjpeg_decode_scan(), mp_decode_frame(), mp_decode_layer3(), mpc8_decode_frame(), mpeg_decode_slice(), parse_bintree(), parse_config_ALS(), parse_fmtp_config(), parse_packet_header(), parse_setup_header(), qdm2_fft_decode_tones(), read_audio_mux_element(), read_len_table(), read_specific_config(), rice_decompress(), seq_unpack_rle_block(), shorten_decode_frame(), skip_data_stream_element(), smka_decode_frame(), synthfilt_build_sb_samples(), tak_decode_frame(), tgv_decode_inter(), tm2_read_stream(), tscc2_decode_mb(), tta_decode_frame(), tta_get_unary(), unpack_block_qpis(), unpack_modes(), unpack_superblocks(), unpack_vectors(), unpack_vlcs(), vble_unpack(), vc1_decode_ac_coeff(), vp6_parse_coeff_huffman(), wavpack_decode_block(), wma_decode_superframe(), wmavoice_decode_packet(), wv_get_value(), wv_get_value_float(), and wv_get_value_integer().

static unsigned int get_bits_long	(	GetBitContext *	s,
		int	n
	)

inlinestatic

Read 0-32 bits.

Definition at line 306 of file get_bits.h.

Referenced by avpriv_flac_parse_streaminfo(), dca_decode_frame(), dca_exss_parse_asset_header(), dca_exss_parse_header(), decode_band_hdr(), decode_block(), decode_buffering_period(), decode_channel_residues(), decode_element(), decode_frame(), decode_gop_header(), decode_lowdelay_slice(), decode_pic_hdr(), decode_picture_timing(), decode_rice(), decode_scalar(), decode_segment(), decode_user_data_itu_t_t35(), decode_vui_parameters(), dirac_decode_picture_header(), escape124_decode_frame(), ff_bgmc_decode_init(), ff_flv_decode_picture_header(), ff_intel_h263_decode_picture_header(), ff_mlp_read_major_sync(), ff_mpeg4_decode_partitions(), ff_msmpeg4_decode_picture_header(), ff_rdt_parse_header(), ff_vc1_decode_blocks(), ff_wma_get_large_val(), flac_header(), get_bits64(), get_block_sizes(), get_float(), get_sbits_long(), get_ue_golomb_long(), init_entropy_decoder(), ivi_dec_tile_data_size(), lag_decode_prob(), latm_get_value(), ls_decode_line(), mjpeg_decode_app(), mjpegb_decode_frame(), mov_read_stsz(), mp_read_changes_map(), mpc8_dec_base(), parse_config_ALS(), read_channel_data(), read_header(), read_offs(), read_specific_config(), read_var_block_data(), rtp_parse_mp4_au(), show_bits_long(), tak_read_header(), theora_header(), tm2_build_huff_table(), tm2_read_deltas(), tm2_read_tree(), truespeech_read_frame(), tta_decode_init(), vaapi_mpeg2_decode_slice(), vorbis_parse_id_hdr(), vorbis_parse_setup_hdr_codebooks(), vp3_init_thread_copy(), and wavpack_decode_block().

static int get_sbits	(	GetBitContext *	s,
		int	n
	)

inlinestatic

static int get_sbits_long	(	GetBitContext *	s,
		int	n
	)

inlinestatic

Read 0-32 bits as a signed integer.

Definition at line 344 of file get_bits.h.

Referenced by decode_channel_residues(), decode_element(), decode_residuals(), decode_subframe(), decode_subframe_fixed(), decode_subframe_lpc(), and read_const_block_data().

static av_always_inline int get_vlc2	(	GetBitContext *	s,
		VLC_TYPE(*)	table[2],
		int	bits,
		int	max_depth
	)

static

Parse a vlc code.

Parameters

bits	is the number of bits which will be read at once, must be identical to nb_bits in init_vlc()
max_depth	is the number of times bits bits must be read to completely read the longest vlc code = (max_vlc_length + bits - 1) / bits

Definition at line 524 of file get_bits.h.

Referenced by asv1_decode_block(), asv1_get_level(), asv2_decode_block(), asv2_get_level(), bitplane_decoding(), check_bits_for_superframe(), decode_bgr_1(), decode_cce(), decode_channel(), decode_coeff(), decode_coeffs(), decode_dc(), decode_envelope(), decode_exp_vlc(), decode_group3_1d_line(), decode_group3_2d_line(), decode_i_block(), decode_i_frame(), decode_mb_info(), decode_mv_component(), decode_p_block(), decode_plane(), decode_residual(), decode_rle(), decode_scale_factors(), decode_scalefactors(), decouple_info(), ff_h263_decode_mb(), ff_h263_decode_motion(), ff_msmpeg4_decode_motion(), ff_rv_decode_dc(), ff_vc1_parse_frame_header(), ff_vc1_parse_frame_header_adv(), ff_wma_run_level_decode(), ff_wmv2_decode_mb(), fraps2_decode_plane(), get_bitalloc(), get_bits_left(), get_coeff(), get_mvdata_interlaced(), get_scale_idx(), h261_decode_block(), h261_decode_mb(), h263_decode_block(), huffman_decode(), idx_to_quant(), imc_read_level_coeffs(), ir2_get_code(), ivi_decode_blocks(), mjpeg_decode_dc(), mp_get_vlc(), mpc7_decode_frame(), mpc8_decode_frame(), mpeg4_decode_dc(), mpeg4_decode_mb(), mpeg4_decode_partition_a(), mpeg4_decode_partition_b(), mpeg4_decode_sprite_trajectory(), mpeg_decode_mb(), mpeg_decode_motion(), mpeg_decode_slice(), msmpeg4_decode_dc(), msmpeg4v12_decode_mb(), msmpeg4v2_decode_motion(), msmpeg4v34_decode_mb(), mss4_decode_dct(), preview_obmc(), qdm2_get_vlc(), read_huff_channels(), read_quant_spectral_coeffs(), read_sbr_envelope(), read_sbr_noise(), rv34_decode_block(), rv34_decode_cbp(), rv40_decode_intra_types(), rv40_decode_mb_info(), smacker_decode_bigtree(), smka_decode_frame(), svq1_decode_block_intra(), svq1_decode_block_non_intra(), svq1_decode_delta_block(), svq1_decode_motion_vector(), synth_frame(), tm2_get_token(), tscc2_decode_mb(), unpack_block_qpis(), unpack_modes(), unpack_SQVH(), unpack_superblocks(), unpack_vectors(), unpack_vlcs(), vc1_decode_ac_coeff(), vc1_decode_b_mb(), vc1_decode_b_mb_intfi(), vc1_decode_b_mb_intfr(), vc1_decode_i_block(), vc1_decode_i_block_adv(), vc1_decode_i_blocks(), vc1_decode_i_blocks_adv(), vc1_decode_intra_block(), vc1_decode_p_block(), vc1_decode_p_mb(), vc1_decode_p_mb_intfi(), vc1_decode_p_mb_intfr(), vlc_decode_block(), vorbis_floor0_decode(), vorbis_floor1_decode(), vorbis_residue_decode_internal(), vp6_parse_coeff_huffman(), wma_decode_block(), wnv1_get_code(), x8_get_ac_rlf(), x8_get_dc_rlf(), and x8_get_orient_vlc().

static int get_xbits	(	GetBitContext *	s,
		int	n
	)

inlinestatic

read mpeg1 dc style vlc (sign bit + mantisse with no MSB).

if MSB not set it is negative

Parameters

n	length in bits

Definition at line 212 of file get_bits.h.

Referenced by decode_dc(), decode_i_block(), get_bits_left(), mjpeg_decode_dc(), mpeg4_decode_dc(), and mpeg4_decode_sprite_trajectory().

static int init_get_bits	(	GetBitContext *	s,
		const uint8_t *	buffer,
		int	bit_size
	)

inlinestatic

Initialize GetBitContext.

Parameters

buffer	bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger than the actual read bits because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
bit_size	the size of the buffer in bits

Returns: 0 on success, AVERROR_INVALIDDATA if the buffer_size would overflow.

Definition at line 379 of file get_bits.h.

Referenced by aac_adtstoasc_filter(), aac_decode_frame(), aac_sync(), ac3_decode_frame(), ac3_eac3_probe(), ac3_sync(), adpcm_swf_decode(), adts_decode_extradata(), adx_decode(), alac_decode_frame(), ape_decode_frame(), atrac1_decode_frame(), av_mpeg4_decode_header(), avpriv_flac_parse_streaminfo(), avpriv_mpeg4audio_get_config(), avs_decode_frame(), bitline2chunky(), bitplanar2chunky(), cavs_decode_frame(), check_bits_for_superframe(), cllc_decode_frame(), dca_decode_frame(), dca_parse_frame_header(), dca_parse_params(), decode_audio_specific_config(), decode_bytes_and_gain(), decode_chunks(), decode_ext_header(), decode_frame(), decode_header_trees(), decode_i_frame(), decode_lowdelay(), decode_nal_units(), decode_p_frame(), decode_packet(), decode_plane(), decode_rle(), decode_slice(), decode_slice_chroma(), decode_slice_luma(), decode_slice_plane(), decode_subband_internal(), decode_wmv9(), dirac_decode_data_unit(), dirac_header(), dnxhd_decode_macroblocks(), dv_decode_video_segment(), dvbsub_read_2bit_string(), dvbsub_read_4bit_string(), encode_picture_ls(), escape124_decode_frame(), escape130_decode_frame(), evrc_decode_frame(), ff_ccitt_unpack(), ff_h263_decode_frame(), ff_h264_find_frame_end(), ff_ivi_decode_frame(), ff_mjpeg_decode_init(), ff_msgsm_decode_block(), ff_rdt_parse_header(), ff_rtjpeg_decode_frame_yuv420(), ff_rtp_send_h263_rfc2190(), ff_rv34_decode_frame(), ff_vorbis_len2vlc(), fill_slice(), flac_decode_frame(), flac_header(), flashsv_decode_frame(), frame_header_is_valid(), fraps2_decode_plane(), g722_decode_frame(), g726_reset(), gsm_decode_frame(), h261_decode_frame(), h261_probe(), h263_handle_packet(), hl_decode_mb(), hl_decode_mb_444(), imc_decode_frame(), init_get_bits8(), ipvideo_decode_opcodes(), ir2_decode_frame(), lag_decode_arith_plane(), latm_write_frame_header(), loco_decode_plane(), main(), mimic_decode_frame(), mjpeg_decode_scan(), mjpegb_decode_frame(), mlp_parse(), mov_read_stsz(), mov_write_ac3_tag(), mov_write_dvc1_structs(), mp_decode_frame(), mp_decode_layer3(), mpc7_decode_frame(), mpc7_decode_init(), mpc8_decode_frame(), mpc8_decode_init(), mpc8_parse_seektable(), mpeg1_decode_picture(), mpeg1_decode_sequence(), mpeg_decode_gop(), mpeg_decode_slice(), mss1_decode_frame(), mss2_decode_frame(), mxpeg_decode_frame(), nelly_decode_block(), parse_fmtp_config(), parse_nal_units(), parse_setup_header(), predictor_calc_error(), process_subpacket_10(), process_subpacket_11(), process_subpacket_12(), process_subpacket_9(), qcelp_decode_frame(), qdm2_decode_fft_packets(), qdm2_decode_super_block(), qt_rtp_parse_packet(), ra144_decode_frame(), ra288_decode_frame(), read_access_unit(), read_huffman_tables(), read_old_huffman_tables(), read_sl_header(), rtp_parse_mp4_au(), rv10_decode_packet(), rv34_decode_slice(), save_bits(), seq_decode_op1(), seq_unpack_rle_block(), seqvideo_decode(), shorten_decode_frame(), sipr_decode_frame(), smka_decode_frame(), spdif_get_offset_and_codec(), spdif_header_aac(), svq1_decode_frame(), svq3_decode_frame(), svq3_decode_init(), synth_superframe(), tak_parse(), tak_read_header(), tgq_decode_mb(), tgv_decode_inter(), theora_header(), tm2_read_stream(), tqi_decode_frame(), truespeech_read_frame(), tscc2_decode_slice(), tta_decode_frame(), tta_decode_init(), twin_decode_frame(), unpack_bitstream(), vaapi_mpeg2_decode_slice(), vble_decode_frame(), vc1_decode_frame(), vc1_decode_init(), vc1_extract_headers(), vorbis_decode_frame(), vorbis_decode_init(), vp3_decode_frame(), vp3_init_thread_copy(), vp6_parse_header(), wavpack_decode_block(), wma_decode_superframe(), wmavoice_decode_init(), wmavoice_decode_packet(), and xan_huffman_decode().

static int init_get_bits8	(	GetBitContext *	s,
		const uint8_t *	buffer,
		int	byte_size
	)

inlinestatic

Initialize GetBitContext.

Parameters

buffer	bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger than the actual read bits because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
byte_size	the size of the buffer in bytes