From 686e388bbb6aeef077095a83f84b53d143d44d63 Mon Sep 17 00:00:00 2001 From: Mark Thompson Date: Thu, 4 May 2017 23:03:03 +0100 Subject: lavc: Add coded bitstream read/write support for MPEG-2 (cherry picked from commit 2bc9ba8d3c41f3a8e56484bd67b05040c7909a01) (cherry picked from commit a41b69b5eb950c10d8ede472bcc4e88ce4246db9) --- libavcodec/cbs_mpeg2.h | 224 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 224 insertions(+) create mode 100644 libavcodec/cbs_mpeg2.h (limited to 'libavcodec/cbs_mpeg2.h') diff --git a/libavcodec/cbs_mpeg2.h b/libavcodec/cbs_mpeg2.h new file mode 100644 index 0000000000..a8f12b2e75 --- /dev/null +++ b/libavcodec/cbs_mpeg2.h @@ -0,0 +1,224 @@ +/* + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVCODEC_CBS_MPEG2_H +#define AVCODEC_CBS_MPEG2_H + +#include +#include + + +enum { + MPEG2_START_PICTURE = 0x00, + MPEG2_START_SLICE_MIN = 0x01, + MPEG2_START_SLICE_MAX = 0xaf, + MPEG2_START_USER_DATA = 0xb2, + MPEG2_START_SEQUENCE_HEADER = 0xb3, + MPEG2_START_SEQUENCE_ERROR = 0xb4, + MPEG2_START_EXTENSION = 0xb5, + MPEG2_START_SEQUENCE_END = 0xb7, + MPEG2_START_GROUP = 0xb8, +}; + +#define MPEG2_START_IS_SLICE(type) \ + ((type) >= MPEG2_START_SLICE_MIN && \ + (type) <= MPEG2_START_SLICE_MAX) + +enum { + MPEG2_EXTENSION_SEQUENCE = 0x1, + MPEG2_EXTENSION_SEQUENCE_DISPLAY = 0x2, + MPEG2_EXTENSION_QUANT_MATRIX = 0x3, + MPEG2_EXTENSION_COPYRIGHT = 0x4, + MPEG2_EXTENSION_SEQUENCE_SCALABLE = 0x5, + MPEG2_EXTENSION_PICTURE_DISPLAY = 0x7, + MPEG2_EXTENSION_PICTURE_CODING = 0x8, + MPEG2_EXTENSION_PICTURE_SPATIAL_SCALABLE = 0x9, + MPEG2_EXTENSION_PICTURE_TEMPORAL_SCALABLE = 0xa, + MPEG2_EXTENSION_CAMAERA_PARAMETERS = 0xb, + MPEG2_EXTENSION_ITU_T = 0xc, +}; + + +typedef struct MPEG2RawSequenceHeader { + uint8_t sequence_header_code; + + uint16_t horizontal_size_value; + uint16_t vertical_size_value; + uint8_t aspect_ratio_information; + uint8_t frame_rate_code; + uint32_t bit_rate_value; + uint16_t vbv_buffer_size_value; + uint8_t constrained_parameters_flag; + + uint8_t load_intra_quantiser_matrix; + uint8_t intra_quantiser_matrix[64]; + uint8_t load_non_intra_quantiser_matrix; + uint8_t non_intra_quantiser_matrix[64]; +} MPEG2RawSequenceHeader; + +typedef struct MPEG2RawUserData { + uint8_t user_data_start_code; + + uint8_t *user_data; + size_t user_data_length; +} MPEG2RawUserData; + +typedef struct MPEG2RawSequenceExtension { + uint8_t profile_and_level_indication; + uint8_t progressive_sequence; + uint8_t chroma_format; + uint8_t horizontal_size_extension; + uint8_t vertical_size_extension; + uint16_t bit_rate_extension; + uint8_t vbv_buffer_size_extension; + uint8_t low_delay; + uint8_t frame_rate_extension_n; + uint8_t frame_rate_extension_d; +} MPEG2RawSequenceExtension; + +typedef struct MPEG2RawSequenceDisplayExtension { + uint8_t video_format; + + uint8_t colour_description; + uint8_t colour_primaries; + uint8_t transfer_characteristics; + uint8_t matrix_coefficients; + + uint16_t display_horizontal_size; + uint16_t display_vertical_size; +} MPEG2RawSequenceDisplayExtension; + +typedef struct MPEG2RawGroupOfPicturesHeader { + uint8_t group_start_code; + + uint32_t time_code; + uint8_t closed_gop; + uint8_t broken_link; +} MPEG2RawGroupOfPicturesHeader; + +typedef struct MPEG2RawPictureHeader { + uint8_t picture_start_code; + + uint16_t temporal_reference; + uint8_t picture_coding_type; + uint16_t vbv_delay; + + uint8_t full_pel_forward_vector; + uint8_t forward_f_code; + uint8_t full_pel_backward_vector; + uint8_t backward_f_code; + + uint8_t extra_bit_picture; +} MPEG2RawPictureHeader; + +typedef struct MPEG2RawPictureCodingExtension { + uint8_t f_code[2][2]; + + uint8_t intra_dc_precision; + uint8_t picture_structure; + uint8_t top_field_first; + uint8_t frame_pred_frame_dct; + uint8_t concealment_motion_vectors; + uint8_t q_scale_type; + uint8_t intra_vlc_format; + uint8_t alternate_scan; + uint8_t repeat_first_field; + uint8_t chroma_420_type; + uint8_t progressive_frame; + + uint8_t composite_display_flag; + uint8_t v_axis; + uint8_t field_sequence; + uint8_t sub_carrier; + uint8_t burst_amplitude; + uint8_t sub_carrier_phase; +} MPEG2RawPictureCodingExtension; + +typedef struct MPEG2RawQuantMatrixExtension { + uint8_t load_intra_quantiser_matrix; + uint8_t intra_quantiser_matrix[64]; + uint8_t load_non_intra_quantiser_matrix; + uint8_t non_intra_quantiser_matrix[64]; + uint8_t load_chroma_intra_quantiser_matrix; + uint8_t chroma_intra_quantiser_matrix[64]; + uint8_t load_chroma_non_intra_quantiser_matrix; + uint8_t chroma_non_intra_quantiser_matrix[64]; +} MPEG2RawQuantMatrixExtension; + +typedef struct MPEG2RawPictureDisplayExtension { + uint16_t frame_centre_horizontal_offset[3]; + uint16_t frame_centre_vertical_offset[3]; +} MPEG2RawPictureDisplayExtension; + +typedef struct MPEG2RawExtensionData { + uint8_t extension_start_code; + uint8_t extension_start_code_identifier; + + union { + MPEG2RawSequenceExtension sequence; + MPEG2RawSequenceDisplayExtension sequence_display; + MPEG2RawQuantMatrixExtension quant_matrix; + MPEG2RawPictureCodingExtension picture_coding; + MPEG2RawPictureDisplayExtension picture_display; + } data; +} MPEG2RawExtensionData; + +typedef struct MPEG2RawSliceHeader { + uint8_t slice_vertical_position; + + uint8_t slice_vertical_position_extension; + uint8_t priority_breakpoint; + + uint8_t quantiser_scale_code; + + uint8_t slice_extension_flag; + uint8_t intra_slice; + uint8_t slice_picture_id_enable; + uint8_t slice_picture_id; + + uint8_t extra_bit_slice; + + size_t extra_information_length; + uint8_t *extra_information; +} MPEG2RawSliceHeader; + +typedef struct MPEG2RawSlice { + MPEG2RawSliceHeader header; + + uint8_t *data; + size_t data_size; + int data_bit_start; +} MPEG2RawSlice; + + +typedef struct CodedBitstreamMPEG2Context { + // Elements stored in headers which are required for other decoding. + uint16_t horizontal_size; + uint16_t vertical_size; + uint8_t scalable; + uint8_t scalable_mode; + uint8_t progressive_sequence; + uint8_t number_of_frame_centre_offsets; + + // Write buffer. + uint8_t *write_buffer; + size_t write_buffer_size; +} CodedBitstreamMPEG2Context; + + +#endif /* AVCODEC_CBS_MPEG2_H */ -- cgit v1.2.3