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FFmpeg
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Functions | |
| int | av_crc_init (AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size) |
| Initialize a CRC table. More... | |
| const AVCRC * | av_crc_get_table (AVCRCId crc_id) |
| Get an initialized standard CRC table. More... | |
| uint32_t | av_crc (const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length) |
| Calculate the CRC of a block. More... | |
Variables | |
| struct { | |
| uint8_t le | |
| uint8_t bits | |
| uint32_t poly | |
| } | av_crc_table_params [AV_CRC_MAX] |
| static AVCRC | av_crc_table [AV_CRC_MAX][257] |
Function Documentation
Calculate the CRC of a block.
- Parameters
-
crc CRC of previous blocks if any or initial value for CRC
- Returns
- CRC updated with the data from the given block
- See also
- av_crc_init() "le" parameter
Definition at line 275 of file crc.c.
Referenced by ac3_decode_frame(), ac3_eac3_probe(), av_crc(), check_header_mismatch(), decode_frame(), doTest(), encode_frame(), ff_crc04C11DB7_update(), ff_flac_decode_frame_header(), ff_mlp_checksum16(), ff_mlp_checksum8(), ff_mlp_restart_checksum(), ff_tak_check_crc(), flac_decode_frame(), mpegts_write_section(), output_frame_end(), read_extra_header(), tta_check_crc(), write_extradata(), write_frame_footer(), write_frame_header(), and write_section_data().
Get an initialized standard CRC table.
- Parameters
-
crc_id ID of a standard CRC
- Returns
- a pointer to the CRC table or NULL on failure
Definition at line 261 of file crc.c.
Referenced by ac3_decode_frame(), ac3_eac3_probe(), av_crc(), check_header_mismatch(), decode_frame(), doTest(), encode_frame(), ff_crc04C11DB7_update(), ff_flac_decode_frame_header(), flac_decode_frame(), mpegts_write_section(), output_frame_end(), read_extra_header(), read_specific_config(), tta_decode_init(), write_extradata(), write_frame_footer(), write_frame_header(), and write_section_data().
| int av_crc_init | ( | AVCRC * | ctx, |
| int | le, | ||
| int | bits, | ||
| uint32_t | poly, | ||
| int | ctx_size | ||
| ) |
Initialize a CRC table.
- Parameters
-
ctx must be an array of size sizeof(AVCRC)*257 or sizeof(AVCRC)*1024 le If 1, the lowest bit represents the coefficient for the highest exponent of the corresponding polynomial (both for poly and actual CRC). If 0, you must swap the CRC parameter and the result of av_crc if you need the standard representation (can be simplified in most cases to e.g. bswap16): av_bswap32(crc << (32-bits)) bits number of bits for the CRC poly generator polynomial without the x**bits coefficient, in the representation as specified by le ctx_size size of ctx in bytes
- Returns
- <0 on failure
Definition at line 228 of file crc.c.
Referenced by av_crc_get_table(), ff_mlp_init_crc(), and ff_tak_init_crc().
Variable Documentation
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static |
Definition at line 225 of file crc.c.
Referenced by av_crc_get_table().
| struct { ... } av_crc_table_params[AV_CRC_MAX] |
Referenced by av_crc_get_table().
| uint8_t bits |
Definition at line 216 of file crc.c.
Referenced by aac_sync(), ac3_compute_mantissa_size_c(), ac3_decode_transform_coeffs_ch(), adaptive_quantization(), apply_lpc(), arith2_get_consumed_bytes(), arith_get_bits(), av_base64_decode(), av_crc_get_table(), av_crc_init(), av_get_bits_per_pixel(), av_get_padded_bits_per_pixel(), avisynth_read_packet_video(), avpriv_copy_bits(), avpriv_copy_pce_data(), aw_parse_coords(), binkb_get_value(), binkb_read_bundle(), bit8x8_c(), bits2qp(), build_huff(), build_huff_tree(), build_table(), calc_bit_demand(), calc_rice_params(), can_safely_read(), check_slice_end(), codebook_trellis_rate(), dca_decode_frame(), dct_error(), decode_band_types(), decode_block(), decode_i2_frame(), decode_init(), decode_rgb_frame(), decode_rle(), decode_spectrum_and_dequant(), decode_subframe(), decode_vbmtree(), dequant(), dnxhd_calc_ac_bits(), dnxhd_encode_rdo(), dnxhd_find_qscale(), dvbsub_read_2bit_string(), dvbsub_read_4bit_string(), dvbsub_read_8bit_string(), encode_block(), encode_frame(), encode_picture(), encode_residual_ch(), encode_rgb_frame(), encode_thread(), estimate_acs(), estimate_dcs(), estimate_slice_plane(), extend_code(), ff_acelp_fc_pulse_per_track(), ff_decode_10_pulses_35bits(), ff_eac3_decode_transform_coeffs_aht_ch(), ff_h263_encode_motion(), ff_h264_decode_mb_cabac(), ff_huffyuv_generate_bits_table(), ff_mp_get_chroma_shift(), ff_mpeg1_encode_init(), ff_mpeg4_merge_partitions(), ff_MPV_encode_picture(), ff_rate_control_init(), ff_rate_estimate_qscale(), ff_rv34_decode_init(), fillPlane16(), find_slice_quant(), find_subframe_rice_params(), fold(), gb_get_v(), generate_joint_tables(), get_bits_diff(), get_bits_left(), get_mvdata_interlaced(), get_qscale(), get_sr_golomb_shorten(), hScale16To19_c(), imc_decode_block(), init_pass2(), init_static(), init_uni_h263_rl_tab(), init_uni_mpeg4_rl_tab(), intlist_read(), ivi_create_huff_from_desc(), lag_decode_prob(), ljpeg_decode_yuv_scan(), main(), mp_decode_layer2(), mpc8_dec_enum(), mpc8_decode_frame(), mpeg1_encode_motion(), mpeg4_decode_partition_a(), msmpeg4v2_encode_motion(), mss4_init_vlc(), nelly_decode_block(), put_codebook_header(), quantize(), rd8x8_c(), read_argb_line(), read_code_table(), read_dct_coeffs(), read_huffman_tables(), read_quant_spectral_coeffs(), read_rgb24_component_line(), read_sbr_envelope(), s302m_parse_frame_header(), scale_vector(), search_for_quantizers_twoloop(), seq_decode_op1(), smka_decode_frame(), vorbis_parse_setup_hdr_floors(), vp56_rac_renorm(), wp_log2(), xan_unpack_luma(), and zero_extend().
| uint8_t le |
Definition at line 215 of file crc.c.
Referenced by av_crc_get_table(), epaf_read_header(), and ircam_read_header().
| uint32_t poly |
Definition at line 217 of file crc.c.
Referenced by av_crc_get_table(), mul_poly(), and tta_check_crc64().
Generated on Fri Dec 20 2024 06:56:11 for FFmpeg by
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