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https://github.com/FFmpeg/FFmpeg.git
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1fe77d4a63
Having these together allows us to find both pointers given the address of only one of them.
232 lines
6.7 KiB
C
232 lines
6.7 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_CBS_MPEG2_H
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#define AVCODEC_CBS_MPEG2_H
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#include <stddef.h>
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#include <stdint.h>
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#include "libavutil/buffer.h"
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enum {
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MPEG2_START_PICTURE = 0x00,
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MPEG2_START_SLICE_MIN = 0x01,
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MPEG2_START_SLICE_MAX = 0xaf,
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MPEG2_START_USER_DATA = 0xb2,
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MPEG2_START_SEQUENCE_HEADER = 0xb3,
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MPEG2_START_SEQUENCE_ERROR = 0xb4,
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MPEG2_START_EXTENSION = 0xb5,
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MPEG2_START_SEQUENCE_END = 0xb7,
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MPEG2_START_GROUP = 0xb8,
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};
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#define MPEG2_START_IS_SLICE(type) \
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((type) >= MPEG2_START_SLICE_MIN && \
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(type) <= MPEG2_START_SLICE_MAX)
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enum {
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MPEG2_EXTENSION_SEQUENCE = 0x1,
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MPEG2_EXTENSION_SEQUENCE_DISPLAY = 0x2,
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MPEG2_EXTENSION_QUANT_MATRIX = 0x3,
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MPEG2_EXTENSION_COPYRIGHT = 0x4,
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MPEG2_EXTENSION_SEQUENCE_SCALABLE = 0x5,
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MPEG2_EXTENSION_PICTURE_DISPLAY = 0x7,
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MPEG2_EXTENSION_PICTURE_CODING = 0x8,
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MPEG2_EXTENSION_PICTURE_SPATIAL_SCALABLE = 0x9,
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MPEG2_EXTENSION_PICTURE_TEMPORAL_SCALABLE = 0xa,
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MPEG2_EXTENSION_CAMERA_PARAMETERS = 0xb,
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MPEG2_EXTENSION_ITU_T = 0xc,
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};
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typedef struct MPEG2RawSequenceHeader {
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uint8_t sequence_header_code;
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uint16_t horizontal_size_value;
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uint16_t vertical_size_value;
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uint8_t aspect_ratio_information;
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uint8_t frame_rate_code;
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uint32_t bit_rate_value;
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uint16_t vbv_buffer_size_value;
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uint8_t constrained_parameters_flag;
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uint8_t load_intra_quantiser_matrix;
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uint8_t intra_quantiser_matrix[64];
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uint8_t load_non_intra_quantiser_matrix;
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uint8_t non_intra_quantiser_matrix[64];
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} MPEG2RawSequenceHeader;
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typedef struct MPEG2RawUserData {
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uint8_t user_data_start_code;
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uint8_t *user_data;
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AVBufferRef *user_data_ref;
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size_t user_data_length;
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} MPEG2RawUserData;
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typedef struct MPEG2RawSequenceExtension {
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uint8_t profile_and_level_indication;
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uint8_t progressive_sequence;
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uint8_t chroma_format;
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uint8_t horizontal_size_extension;
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uint8_t vertical_size_extension;
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uint16_t bit_rate_extension;
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uint8_t vbv_buffer_size_extension;
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uint8_t low_delay;
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uint8_t frame_rate_extension_n;
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uint8_t frame_rate_extension_d;
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} MPEG2RawSequenceExtension;
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typedef struct MPEG2RawSequenceDisplayExtension {
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uint8_t video_format;
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uint8_t colour_description;
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uint8_t colour_primaries;
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uint8_t transfer_characteristics;
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uint8_t matrix_coefficients;
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uint16_t display_horizontal_size;
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uint16_t display_vertical_size;
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} MPEG2RawSequenceDisplayExtension;
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typedef struct MPEG2RawGroupOfPicturesHeader {
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uint8_t group_start_code;
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uint32_t time_code;
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uint8_t closed_gop;
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uint8_t broken_link;
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} MPEG2RawGroupOfPicturesHeader;
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typedef struct MPEG2RawExtraInformation {
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uint8_t *extra_information;
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AVBufferRef *extra_information_ref;
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size_t extra_information_length;
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} MPEG2RawExtraInformation;
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typedef struct MPEG2RawPictureHeader {
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uint8_t picture_start_code;
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uint16_t temporal_reference;
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uint8_t picture_coding_type;
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uint16_t vbv_delay;
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uint8_t full_pel_forward_vector;
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uint8_t forward_f_code;
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uint8_t full_pel_backward_vector;
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uint8_t backward_f_code;
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MPEG2RawExtraInformation extra_information_picture;
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} MPEG2RawPictureHeader;
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typedef struct MPEG2RawPictureCodingExtension {
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uint8_t f_code[2][2];
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uint8_t intra_dc_precision;
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uint8_t picture_structure;
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uint8_t top_field_first;
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uint8_t frame_pred_frame_dct;
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uint8_t concealment_motion_vectors;
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uint8_t q_scale_type;
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uint8_t intra_vlc_format;
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uint8_t alternate_scan;
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uint8_t repeat_first_field;
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uint8_t chroma_420_type;
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uint8_t progressive_frame;
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uint8_t composite_display_flag;
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uint8_t v_axis;
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uint8_t field_sequence;
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uint8_t sub_carrier;
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uint8_t burst_amplitude;
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uint8_t sub_carrier_phase;
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} MPEG2RawPictureCodingExtension;
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typedef struct MPEG2RawQuantMatrixExtension {
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uint8_t load_intra_quantiser_matrix;
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uint8_t intra_quantiser_matrix[64];
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uint8_t load_non_intra_quantiser_matrix;
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uint8_t non_intra_quantiser_matrix[64];
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uint8_t load_chroma_intra_quantiser_matrix;
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uint8_t chroma_intra_quantiser_matrix[64];
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uint8_t load_chroma_non_intra_quantiser_matrix;
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uint8_t chroma_non_intra_quantiser_matrix[64];
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} MPEG2RawQuantMatrixExtension;
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typedef struct MPEG2RawPictureDisplayExtension {
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int16_t frame_centre_horizontal_offset[3];
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int16_t frame_centre_vertical_offset[3];
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} MPEG2RawPictureDisplayExtension;
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typedef struct MPEG2RawExtensionData {
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uint8_t extension_start_code;
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uint8_t extension_start_code_identifier;
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union {
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MPEG2RawSequenceExtension sequence;
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MPEG2RawSequenceDisplayExtension sequence_display;
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MPEG2RawQuantMatrixExtension quant_matrix;
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MPEG2RawPictureCodingExtension picture_coding;
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MPEG2RawPictureDisplayExtension picture_display;
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} data;
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} MPEG2RawExtensionData;
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typedef struct MPEG2RawSliceHeader {
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uint8_t slice_vertical_position;
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uint8_t slice_vertical_position_extension;
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uint8_t priority_breakpoint;
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uint8_t quantiser_scale_code;
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uint8_t slice_extension_flag;
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uint8_t intra_slice;
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uint8_t slice_picture_id_enable;
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uint8_t slice_picture_id;
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MPEG2RawExtraInformation extra_information_slice;
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} MPEG2RawSliceHeader;
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typedef struct MPEG2RawSlice {
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MPEG2RawSliceHeader header;
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uint8_t *data;
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AVBufferRef *data_ref;
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size_t data_size;
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int data_bit_start;
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} MPEG2RawSlice;
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typedef struct MPEG2RawSequenceEnd {
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uint8_t sequence_end_code;
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} MPEG2RawSequenceEnd;
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typedef struct CodedBitstreamMPEG2Context {
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// Elements stored in headers which are required for other decoding.
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uint16_t horizontal_size;
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uint16_t vertical_size;
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uint8_t scalable;
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uint8_t scalable_mode;
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uint8_t progressive_sequence;
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uint8_t number_of_frame_centre_offsets;
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} CodedBitstreamMPEG2Context;
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#endif /* AVCODEC_CBS_MPEG2_H */
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