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"

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.

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

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

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).

static int	get_sbits (GetBitContext *s, int n)

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

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

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.

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

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

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

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.

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

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.

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 UNCHECKED_BITSTREAM_READER !CONFIG_SAFE_BITSTREAM_READER

Definition at line 51 of file get_bits.h.

#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(), 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().

#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

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 HAVE_BITS_REMAINING	(	name,
		gb
	)	1

Definition at line 130 of file get_bits.h.

Referenced by svq3_get_ue_golomb().

#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 UPDATE_CACHE	(	name,
		gb
	)

Value:

name ## _cache = \

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

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 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 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 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)

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 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
	)

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_USE_NEW_STATIC 4

#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 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 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 tprintf	(	p,
		...
	)	{ }

Function Documentation

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_rdt_parse_header(), ff_rtjpeg_decode_frame_yuv420(), 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(), 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(), 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(), wma_decode_superframe(), and wmavoice_decode_packet().

static void skip_bits_long	(	GetBitContext *	s,
		int	n
	)

inlinestatic

Definition at line 198 of file get_bits.h.

Referenced by adts_decode_extradata(), avpriv_flac_parse_streaminfo(), avpriv_mpeg4audio_get_config(), bink_decode_plane(), binkb_decode_plane(), check_bits_for_superframe(), check_for_slice(), dca_decode_frame(), dca_exss_parse_asset_header(), dca_exss_parse_header(), dca_exss_skip_mix_coeffs(), dca_parse_audio_coding_header(), dca_parse_frame_header(), dca_parse_params(), dca_subframe_footer(), dca_xbr_parse_frame(), dca_xxch_decode_frame(), decode_audio_specific_config(), decode_component(), decode_extension_payload(), decode_fill(), decode_frame(), decode_gop_header(), decode_lowdelay_slice(), decode_pce(), decode_pic_hdr(), decode_slice(), decode_subframe(), decode_vol_header(), decode_vop_header(), escape130_decode_frame(), ff_bgmc_decode_end(), ff_decode_sbr_extension(), ff_dirac_init_arith_decoder(), ff_eac3_parse_header(), ff_h264_decode_mb_cavlc(), ff_ivi_decode_frame(), ff_mlp_read_major_sync(), flac_header(), flashsv_decode_block(), get_ue_golomb_long(), handle_rstn(), huffman_decode(), latm_decode_audio_specific_config(), latm_write_frame_header(), mov_write_dvc1_structs(), mp_decode_layer3(), mpc7_decode_frame(), mpc7_decode_init(), nelly_decode_block(), parse_config_ALS(), parse_setup_header(), read_frame_data(), read_sbr_extension(), read_sl_header(), read_specific_config(), read_stream_mux_config(), save_bits(), skip_data_stream_element(), svq3_decode_slice_header(), switch_buffer(), theora_header(), tta_decode_frame(), tta_decode_init(), vp3_decode_frame(), and wmavoice_decode_packet().

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(), mjpeg_decode_dc(), mpeg4_decode_dc(), and mpeg4_decode_sprite_trajectory().

static int get_sbits	(	GetBitContext *	s,
		int	n
	)

inlinestatic

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 show_bits	(	GetBitContext *	s,
		int	n
	)

inlinestatic

Show 1-25 bits.

Definition at line 255 of file get_bits.h.

Referenced by aac_adtstoasc_filter(), aac_decode_frame_int(), avpriv_mpeg4audio_get_config(), check_for_slice(), check_slice_end(), dca_decode_frame(), decode_ac_coeffs(), decode_packet(), decode_pic(), decode_residual(), decode_scalar(), decode_slice(), decode_user_data(), decode_vop_header(), ff_ccitt_unpack(), ff_h261_resync(), ff_h263_decode_mb(), ff_h263_resync(), ff_h264_decode_sei(), ff_ivi_decode_frame(), ff_mjpeg_decode_sos(), ff_mpeg4_decode_partitions(), ff_mpeg4_decode_picture_header(), ff_msmpeg4_decode_block(), ff_wmv2_decode_mb(), h261_decode_block(), h261_decode_gob_header(), h263_decode_gob_header(), handle_rstn(), latm_decode_frame(), main(), mjpegb_decode_frame(), mpeg1_decode_sequence(), mpeg4_decode_gop_header(), mpeg4_decode_partition_a(), mpeg4_is_resync(), mpeg_decode_slice(), msmpeg4v34_decode_mb(), read_sbr_extension(), rv10_decode_packet(), rv10_decode_picture_header(), show_bits1(), show_bits_long(), svq3_decode_frame(), svq3_decode_slice_header(), tgq_decode_block(), and vble_unpack().

static void skip_bits	(	GetBitContext *	s,
		int	n
	)

inlinestatic

Definition at line 265 of file get_bits.h.

static unsigned int get_bits1 ( GetBitContext * s )

inlinestatic

Definition at line 273 of file get_bits.h.

static unsigned int show_bits1 ( GetBitContext * s )

inlinestatic

Definition at line 293 of file get_bits.h.

static void skip_bits1 ( GetBitContext * s )

inlinestatic

Definition at line 298 of file get_bits.h.

Referenced by avpriv_aac_parse_header(), dca_xxch_decode_frame(), decode_channel_map(), decode_dynamic_range(), decode_ga_specific_config(), decode_pic(), decode_seq_header(), decode_sequence_header_adv(), decode_vol_header(), decode_vop_header(), dnxhd_decode_macroblock(), ff_eac3_parse_header(), ff_flv_decode_picture_header(), ff_h263_decode_mb(), ff_h263_decode_picture_header(), ff_h263_resync(), ff_h264_decode_ref_pic_marking(), ff_intel_h263_decode_picture_header(), flac_header(), h261_decode_picture_header(), mpeg4_decode_gop_header(), mpeg4_decode_partition_a(), mpeg4_decode_sprite_trajectory(), mpeg_decode_mb(), mpeg_decode_sequence_extension(), mpeg_decode_slice(), preview_obmc(), read_access_unit(), read_specific_config(), rv30_parse_slice_header(), rv40_parse_slice_header(), smacker_decode_header_tree(), smka_decode_frame(), svq1_decode_frame_header(), svq3_decode_init(), svq3_decode_slice_header(), unpack_bitstream(), and vorbis_parse_audio_packet().

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_wma_get_large_val(), flac_header(), get_bits64(), get_block_sizes(), get_float(), get_sbits_long(), get_ue_golomb_long(), 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(), and wavpack_decode_block().

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_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 unsigned int show_bits_long	(	GetBitContext *	s,
		int	n
	)

inlinestatic

Show 0-32 bits.

Definition at line 352 of file get_bits.h.

Referenced by avpriv_ac3_parse_header(), avpriv_mpeg4audio_get_config(), check_for_slice(), decode_subframe(), ff_vc1_decode_entry_point(), ff_vc1_decode_sequence_header(), get_ue_golomb_long(), ls_get_code_regular(), ls_get_code_runterm(), main(), mpeg4_decode_partition_a(), read_access_unit(), and tta_decode_init().

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 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(), 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_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(), 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(), mss4_decode_frame(), mxpeg_decode_frame(), nelly_decode_block(), parse_fmtp_config(), parse_nal_units(), parse_setup_header(), 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(), 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

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

Definition at line 410 of file get_bits.h.

Referenced by decode_frame(), latm_decode_frame(), pcx_decode_frame(), read_specific_config(), and tak_decode_frame().

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(), 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().

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 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_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_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().