FFmpeg
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Data Structures | |
struct | BSCTX |
Macros | |
#define | BS_SUFFIX_LOWER _be |
#define | BS_SUFFIX_UPPER BE |
#define | BS_JOIN(x, y, z) x ## y ## z |
#define | BS_JOIN3(x, y, z) BS_JOIN(x, y, z) |
#define | BS_FUNC(x) BS_JOIN3(bits_, x, BS_SUFFIX_LOWER) |
#define | BSCTX BS_JOIN3(Bitstream, Context, BS_SUFFIX_UPPER) |
Functions | |
static int BS_FUNC() | priv_refill_64 (BSCTX *bc) |
static int BS_FUNC() | priv_refill_32 (BSCTX *bc) |
static int BS_FUNC() | init (BSCTX *bc, const uint8_t *buffer, unsigned int bit_size) |
Initialize BitstreamContext. More... | |
static int BS_FUNC() | init8 (BSCTX *bc, const uint8_t *buffer, unsigned int byte_size) |
Initialize BitstreamContext. More... | |
static int BS_FUNC() | tell (const BSCTX *bc) |
Return number of bits already read. More... | |
static int BS_FUNC() | size (const BSCTX *bc) |
Return buffer size in bits. More... | |
static int BS_FUNC() | left (const BSCTX *bc) |
Return the number of the bits left in a buffer. More... | |
static uint64_t BS_FUNC() | priv_val_show (BSCTX *bc, unsigned int n) |
static void BS_FUNC() | priv_skip_remaining (BSCTX *bc, unsigned int n) |
static uint64_t BS_FUNC() | priv_val_get (BSCTX *bc, unsigned int n) |
static unsigned int BS_FUNC() | read_bit (BSCTX *bc) |
Return one bit from the buffer. More... | |
static uint32_t BS_FUNC() | read_nz (BSCTX *bc, unsigned int n) |
Return n bits from the buffer, n has to be in the 1-32 range. More... | |
static uint32_t BS_FUNC() | read (BSCTX *bc, unsigned int n) |
Return n bits from the buffer, n has to be in the 0-32 range. More... | |
static uint64_t BS_FUNC() | read_63 (BSCTX *bc, unsigned int n) |
Return n bits from the buffer, n has to be in the 0-63 range. More... | |
static uint64_t BS_FUNC() | read_64 (BSCTX *bc, unsigned int n) |
Return n bits from the buffer, n has to be in the 0-64 range. More... | |
static int32_t BS_FUNC() | read_signed_nz (BSCTX *bc, unsigned int n) |
Return n bits from the buffer as a signed integer, n has to be in the 1-32 range. More... | |
static int32_t BS_FUNC() | read_signed (BSCTX *bc, unsigned int n) |
Return n bits from the buffer as a signed integer. More... | |
static uint32_t BS_FUNC() | peek_nz (BSCTX *bc, unsigned int n) |
Return n bits from the buffer but do not change the buffer state. More... | |
static uint32_t BS_FUNC() | peek (BSCTX *bc, unsigned int n) |
Return n bits from the buffer but do not change the buffer state. More... | |
static int BS_FUNC() | peek_signed_nz (BSCTX *bc, unsigned int n) |
Return n bits from the buffer as a signed integer, do not change the buffer state. More... | |
static int BS_FUNC() | peek_signed (BSCTX *bc, unsigned int n) |
Return n bits from the buffer as a signed integer, do not change the buffer state. More... | |
static void BS_FUNC() | skip (BSCTX *bc, unsigned int n) |
Skip n bits in the buffer. More... | |
static void BS_FUNC() | seek (BSCTX *bc, unsigned pos) |
Seek to the given bit position. More... | |
static const uint8_t *BS_FUNC() | align (BSCTX *bc) |
Skip bits to a byte boundary. More... | |
static int BS_FUNC() | read_xbits (BSCTX *bc, unsigned int n) |
Read MPEG-1 dc-style VLC (sign bit + mantissa with no MSB). More... | |
static int BS_FUNC() | decode012 (BSCTX *bc) |
Return decoded truncated unary code for the values 0, 1, 2. More... | |
static int BS_FUNC() | decode210 (BSCTX *bc) |
Return decoded truncated unary code for the values 2, 1, 0. More... | |
static int BS_FUNC() | apply_sign (BSCTX *bc, int val) |
static int BS_FUNC() | skip_1stop_8data (BSCTX *s) |
static int BS_FUNC() | priv_set_idx (BSCTX *bc, int code, int *n, int *nb_bits, const VLCElem *table) |
Return the LUT element for the given bitstream configuration. More... | |
static int BS_FUNC() | read_vlc (BSCTX *bc, const VLCElem *table, int bits, int max_depth) |
Parse a vlc code. More... | |
static int BS_FUNC() | read_vlc_multi (BSCTX *bc, uint8_t dst[8], const VLC_MULTI_ELEM *const Jtable, const VLCElem *const table, const int bits, const int max_depth) |
Parse a vlc / vlc_multi code. More... | |
#define BS_SUFFIX_LOWER _be |
Definition at line 25 of file bitstream_template.h.
#define BS_SUFFIX_UPPER BE |
Definition at line 26 of file bitstream_template.h.
#define BS_JOIN | ( | x, | |
y, | |||
z | |||
) | x ## y ## z |
Definition at line 29 of file bitstream_template.h.
#define BS_JOIN3 | ( | x, | |
y, | |||
z | |||
) | BS_JOIN(x, y, z) |
Definition at line 30 of file bitstream_template.h.
#define BS_FUNC | ( | x | ) | BS_JOIN3(bits_, x, BS_SUFFIX_LOWER) |
Definition at line 31 of file bitstream_template.h.
#define BSCTX BS_JOIN3(Bitstream, Context, BS_SUFFIX_UPPER) |
Definition at line 33 of file bitstream_template.h.
Always succeeds when UNCHECKED_BITSTREAM_READER is enabled.
Definition at line 50 of file bitstream_template.h.
Referenced by init(), read_63(), read_bit(), and skip().
Always succeeds when UNCHECKED_BITSTREAM_READER is enabled.
Definition at line 75 of file bitstream_template.h.
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inlinestatic |
Initialize BitstreamContext.
buffer | bitstream buffer, must be AV_INPUT_BUFFER_PADDING_SIZE bytes larger than the actual read bits because some optimized bitstream readers read 32 or 64 bits at once and could read over the end |
bit_size | the size of the buffer in bits |
Definition at line 101 of file bitstream_template.h.
Referenced by init8().
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inlinestatic |
Initialize BitstreamContext.
buffer | bitstream buffer, must be AV_INPUT_BUFFER_PADDING_SIZE bytes larger than the actual read bits because some optimized bitstream readers read 32 or 64 bits at once and could read over the end |
byte_size | the size of the buffer in bytes |
Definition at line 135 of file bitstream_template.h.
Return number of bits already read.
Definition at line 146 of file bitstream_template.h.
Referenced by align(), and quant_band_template().
Return buffer size in bits.
Definition at line 154 of file bitstream_template.h.
Return the number of the bits left in a buffer.
Definition at line 162 of file bitstream_template.h.
Referenced by read_63(), and skip_1stop_8data().
Definition at line 167 of file bitstream_template.h.
Referenced by peek_nz(), and priv_val_get().
Definition at line 178 of file bitstream_template.h.
Referenced by priv_val_get(), read_vlc(), read_vlc_multi(), read_xbits(), and skip().
Definition at line 188 of file bitstream_template.h.
Referenced by read_63(), read_bit(), and read_nz().
Return one bit from the buffer.
Definition at line 203 of file bitstream_template.h.
Referenced by decode012(), decode210(), read_64(), and skip_1stop_8data().
Return n bits from the buffer, n has to be in the 1-32 range.
May be faster than bits_read() when n is not a compile-time constant and is known to be non-zero;
Definition at line 216 of file bitstream_template.h.
Referenced by read(), and read_signed_nz().
Return n bits from the buffer, n has to be in the 0-32 range.
Definition at line 231 of file bitstream_template.h.
Referenced by audio_read_packet(), av_file_map(), cache_read(), check(), ebml_read_num(), ff_amf_read_number(), ff_get_cpu_flags_ppc(), file_read(), flv_set_video_codec(), ftp_read(), get_strl(), headphone_convolute(), jpegxl_anim_read_header(), lag_decode_arith_plane(), main(), mlp_read_header(), mxf_parse_klv(), read_key(), read_line_to_bprint_escaped(), read_string_to_bprint(), retry_transfer_wrapper(), rtmp_packet_read_one_chunk(), skip_icc_profile(), smush_read_header(), sofalizer_convolute(), and tls_read_cb().
Return n bits from the buffer, n has to be in the 0-63 range.
Definition at line 244 of file bitstream_template.h.
Referenced by read_64().
Return n bits from the buffer, n has to be in the 0-64 range.
Definition at line 278 of file bitstream_template.h.
Return n bits from the buffer as a signed integer, n has to be in the 1-32 range.
May be faster than bits_read_signed() when n is not a compile-time constant and is known to be non-zero;
Definition at line 298 of file bitstream_template.h.
Referenced by read_signed().
Return n bits from the buffer as a signed integer.
n has to be in the 0-32 range.
Definition at line 308 of file bitstream_template.h.
Referenced by apply_sign().
Return n bits from the buffer but do not change the buffer state.
n has to be in the 1-32 range. May
Definition at line 322 of file bitstream_template.h.
Referenced by peek(), and peek_signed_nz().
Return n bits from the buffer but do not change the buffer state.
n has to be in the 0-32 range.
Definition at line 336 of file bitstream_template.h.
Referenced by priv_set_idx(), read_vlc(), read_vlc_multi(), read_xbits(), and receive_for_stream().
Return n bits from the buffer as a signed integer, do not change the buffer state.
n has to be in the 1-32 range. May be faster than bits_peek_signed() when n is not a compile-time constant and is known to be non-zero;
Definition at line 351 of file bitstream_template.h.
Referenced by peek_signed().
Return n bits from the buffer as a signed integer, do not change the buffer state.
n has to be in the 0-32 range.
Definition at line 362 of file bitstream_template.h.
Skip n bits in the buffer.
Definition at line 375 of file bitstream_template.h.
Referenced by aax_read_packet(), ac3_decode_frame(), align(), append_flv_data(), asf_read_multiple_payload(), av_read_image_line2(), av_write_image_line2(), avui_decode_frame(), avui_encode_frame(), cbs_h264_discarded_nal_unit(), cbs_h265_discarded_nal_unit(), cdtoons_render_sprite(), clv_decode_frame(), conv_down(), convert_coeffs(), convert_frame(), convert_frame_partial(), cpia_decode_frame(), cri_decode_frame(), decode_555(), decode_block(), decode_dct(), decode_frame(), decode_header_trees(), decode_inter_block(), decode_inter_blocks(), decode_inter_plane(), decode_intra_block(), decode_intra_blocks(), decode_intra_plane(), decode_long_vertical_delta2(), decode_mad1(), decode_motion_vectors(), decode_mvdv(), decode_rle(), decode_scale_factors(), decode_tdlt(), decompress_5(), decompress_68(), dshow_cycle_devices(), dtshd_read_header(), dwa_uncompress(), dwt_plane(), dxv_decompress_yo(), encode_slices(), end_ebml_master_crc32(), escape124_decode_frame(), escape130_decode_frame(), ff_cbs_discard_units(), ff_configure_buffers_for_index(), ff_h264_decode_mb_cabac(), ff_hevc_hls_filter(), ff_htmlmarkup_to_ass(), ff_libwebp_get_frame(), ff_mjpeg_decode_frame_from_buf(), ff_mjpeg_find_marker(), ff_rm_read_mdpr_codecdata(), ff_tx_decompose_length(), ff_vk_filter_init_context(), fic_decode_frame(), filter_channel(), filter_start(), find_frame_end(), finished_reading_packet(), flush(), flv_data_packet(), flv_read_packet(), forward(), frame_data_apply(), g722_decode_frame(), gif_read_header(), gxf_packet(), handle_notify(), ipvideo_decode_format_10_opcodes(), is_animated_webp_packet(), main(), mp_decode_layer3(), mpc7_decode_frame(), mpegps_read_packet(), mpegps_read_pes_header(), mpegts_push_data(), mss4_decode_dct(), mxf_read_packet(), nut_read_packet(), old_codec47(), opus_packet(), output_chunk_list(), pnm_parse(), qpeg_decode_inter(), qtrle_decode_1bpp(), r3d_read_packet(), read_code(), read_header(), read_kuki_chunk(), read_packet(), rm_read_index(), rm_sync(), rtmp_write(), rtp_asf_fix_header(), seek(), sga_read_header(), skip_1stop_8data(), swf_read_packet(), tm2_read_stream(), ulti_decode_frame(), vc1_decode_ac_coeff(), vc1_decode_i_block(), vc1_decode_i_block_adv(), vc1_decode_intra_block(), vc1_decode_p_block(), vc1_unescape_buffer_neon(), vorbis_packet(), vpk_read_packet(), and webvtt_event_to_ass().
Seek to the given bit position.
Definition at line 399 of file bitstream_template.h.
Referenced by avio_alloc_context(), ffio_init_context(), id3v2_parse(), and main().
Skip bits to a byte boundary.
Definition at line 411 of file bitstream_template.h.
Referenced by ads_read_header(), av_frame_get_buffer(), av_image_alloc(), av_image_copy_to_buffer(), av_image_fill_arrays(), av_image_get_buffer_size(), av_samples_alloc(), av_samples_alloc_array_and_samples(), av_samples_fill_arrays(), av_samples_get_buffer_size(), avcodec_align_dimensions(), avcodec_fill_audio_frame(), check_for_slice(), check_idct(), dcstr_read_header(), decode_0(), decode_block(), decode_frame(), ff_create_memory_sample(), ff_default_get_audio_buffer(), ff_default_get_video_buffer2(), ff_frame_pool_audio_init(), ff_frame_pool_get_audio_config(), ff_frame_pool_get_video_config(), ff_frame_pool_video_init(), ff_mjpeg_escape_FF(), genh_read_header(), get_audio_buffer(), get_video_buffer(), main(), read_vblock(), run_single_test(), save_bits(), svag_read_header(), sws_receive_slice(), and v210_stride().
Read MPEG-1 dc-style VLC (sign bit + mantissa with no MSB).
If MSB not set it is negative.
n | length in bits |
Definition at line 424 of file bitstream_template.h.
Return decoded truncated unary code for the values 0, 1, 2.
Definition at line 436 of file bitstream_template.h.
Referenced by decode_frame_header(), ff_msmpeg4_decode_picture_header(), ff_vc1_parse_frame_header(), ff_vc1_parse_frame_header_adv(), 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(), wmv2_decode_inter_block(), and wmv2_decode_mb().
Return decoded truncated unary code for the values 2, 1, 0.
Definition at line 447 of file bitstream_template.h.
Referenced by decode_mb(), ff_vc1_parse_frame_header_adv(), and vc1_decode_ac_coeff().
Definition at line 456 of file bitstream_template.h.
Definition at line 462 of file bitstream_template.h.
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inlinestatic |
Return the LUT element for the given bitstream configuration.
Definition at line 479 of file bitstream_template.h.
Referenced by read_vlc(), and read_vlc_multi().
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inlinestatic |
Parse a vlc code.
bits | is the number of bits which will be read at once, must be identical to nb_bits in vlc_init() |
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 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 502 of file bitstream_template.h.
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inlinestatic |
Parse a vlc / vlc_multi code.
bits | is the number of bits which will be read at once, must be identical to nb_bits in vlc_init() |
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 |
dst | the parsed symbol(s) will be stored here. Up to 8 bytes are written |
Definition at line 536 of file bitstream_template.h.