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   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #ifndef AVCODEC_CBS_MPEG2_H
  20 #define AVCODEC_CBS_MPEG2_H
  21
  22 #include <stddef.h>
  23 #include <stdint.h>
  24
  25 #include "libavutil/buffer.h"
  26
  27
  28 enum {
  29     MPEG2_START_PICTURE         = 0x00,
  30     MPEG2_START_SLICE_MIN       = 0x01,
  31     MPEG2_START_SLICE_MAX       = 0xaf,
  32     MPEG2_START_USER_DATA       = 0xb2,
  33     MPEG2_START_SEQUENCE_HEADER = 0xb3,
  34     MPEG2_START_SEQUENCE_ERROR  = 0xb4,
  35     MPEG2_START_EXTENSION       = 0xb5,
  36     MPEG2_START_SEQUENCE_END    = 0xb7,
  37     MPEG2_START_GROUP           = 0xb8,
  38 };
  39
  40 #define MPEG2_START_IS_SLICE(type) \
  41     ((type) >= MPEG2_START_SLICE_MIN && \
  42      (type) <= MPEG2_START_SLICE_MAX)
  43
  44 enum {
  45     MPEG2_EXTENSION_SEQUENCE                  = 0x1,
  46     MPEG2_EXTENSION_SEQUENCE_DISPLAY          = 0x2,
  47     MPEG2_EXTENSION_QUANT_MATRIX              = 0x3,
  48     MPEG2_EXTENSION_COPYRIGHT                 = 0x4,
  49     MPEG2_EXTENSION_SEQUENCE_SCALABLE         = 0x5,
  50     MPEG2_EXTENSION_PICTURE_DISPLAY           = 0x7,
  51     MPEG2_EXTENSION_PICTURE_CODING            = 0x8,
  52     MPEG2_EXTENSION_PICTURE_SPATIAL_SCALABLE  = 0x9,
  53     MPEG2_EXTENSION_PICTURE_TEMPORAL_SCALABLE = 0xa,
  54     MPEG2_EXTENSION_CAMAERA_PARAMETERS        = 0xb,
  55     MPEG2_EXTENSION_ITU_T                     = 0xc,
  56 };
  57
  58
  59 typedef struct MPEG2RawSequenceHeader {
  60     uint8_t sequence_header_code;
  61
  62     uint16_t horizontal_size_value;
  63     uint16_t vertical_size_value;
  64     uint8_t aspect_ratio_information;
  65     uint8_t frame_rate_code;
  66     uint32_t bit_rate_value;
  67     uint16_t vbv_buffer_size_value;
  68     uint8_t constrained_parameters_flag;
  69
  70     uint8_t load_intra_quantiser_matrix;
  71     uint8_t intra_quantiser_matrix[64];
  72     uint8_t load_non_intra_quantiser_matrix;
  73     uint8_t non_intra_quantiser_matrix[64];
  74 } MPEG2RawSequenceHeader;
  75
  76 typedef struct MPEG2RawUserData {
  77     uint8_t user_data_start_code;
  78
  79     uint8_t *user_data;
  80     size_t user_data_length;
  81     AVBufferRef *user_data_ref;
  82 } MPEG2RawUserData;
  83
  84 typedef struct MPEG2RawSequenceExtension {
  85     uint8_t profile_and_level_indication;
  86     uint8_t progressive_sequence;
  87     uint8_t chroma_format;
  88     uint8_t horizontal_size_extension;
  89     uint8_t vertical_size_extension;
  90     uint16_t bit_rate_extension;
  91     uint8_t vbv_buffer_size_extension;
  92     uint8_t low_delay;
  93     uint8_t frame_rate_extension_n;
  94     uint8_t frame_rate_extension_d;
  95 } MPEG2RawSequenceExtension;
  96
  97 typedef struct MPEG2RawSequenceDisplayExtension {
  98     uint8_t video_format;
  99
 100     uint8_t colour_description;
 101     uint8_t colour_primaries;
 102     uint8_t transfer_characteristics;
 103     uint8_t matrix_coefficients;
 104
 105     uint16_t display_horizontal_size;
 106     uint16_t display_vertical_size;
 107 } MPEG2RawSequenceDisplayExtension;
 108
 109 typedef struct MPEG2RawGroupOfPicturesHeader {
 110     uint8_t group_start_code;
 111
 112     uint32_t time_code;
 113     uint8_t closed_gop;
 114     uint8_t broken_link;
 115 } MPEG2RawGroupOfPicturesHeader;
 116
 117 typedef struct MPEG2RawPictureHeader {
 118     uint8_t picture_start_code;
 119
 120     uint16_t temporal_reference;
 121     uint8_t picture_coding_type;
 122     uint16_t vbv_delay;
 123
 124     uint8_t full_pel_forward_vector;
 125     uint8_t forward_f_code;
 126     uint8_t full_pel_backward_vector;
 127     uint8_t backward_f_code;
 128
 129     uint8_t extra_bit_picture;
 130 } MPEG2RawPictureHeader;
 131
 132 typedef struct MPEG2RawPictureCodingExtension {
 133     uint8_t f_code[2][2];
 134
 135     uint8_t intra_dc_precision;
 136     uint8_t picture_structure;
 137     uint8_t top_field_first;
 138     uint8_t frame_pred_frame_dct;
 139     uint8_t concealment_motion_vectors;
 140     uint8_t q_scale_type;
 141     uint8_t intra_vlc_format;
 142     uint8_t alternate_scan;
 143     uint8_t repeat_first_field;
 144     uint8_t chroma_420_type;
 145     uint8_t progressive_frame;
 146
 147     uint8_t composite_display_flag;
 148     uint8_t v_axis;
 149     uint8_t field_sequence;
 150     uint8_t sub_carrier;
 151     uint8_t burst_amplitude;
 152     uint8_t sub_carrier_phase;
 153 } MPEG2RawPictureCodingExtension;
 154
 155 typedef struct MPEG2RawQuantMatrixExtension {
 156     uint8_t load_intra_quantiser_matrix;
 157     uint8_t intra_quantiser_matrix[64];
 158     uint8_t load_non_intra_quantiser_matrix;
 159     uint8_t non_intra_quantiser_matrix[64];
 160     uint8_t load_chroma_intra_quantiser_matrix;
 161     uint8_t chroma_intra_quantiser_matrix[64];
 162     uint8_t load_chroma_non_intra_quantiser_matrix;
 163     uint8_t chroma_non_intra_quantiser_matrix[64];
 164 } MPEG2RawQuantMatrixExtension;
 165
 166 typedef struct MPEG2RawPictureDisplayExtension {
 167     uint16_t frame_centre_horizontal_offset[3];
 168     uint16_t frame_centre_vertical_offset[3];
 169 } MPEG2RawPictureDisplayExtension;
 170
 171 typedef struct MPEG2RawExtensionData {
 172     uint8_t extension_start_code;
 173     uint8_t extension_start_code_identifier;
 174
 175     union {
 176         MPEG2RawSequenceExtension sequence;
 177         MPEG2RawSequenceDisplayExtension sequence_display;
 178         MPEG2RawQuantMatrixExtension quant_matrix;
 179         MPEG2RawPictureCodingExtension picture_coding;
 180         MPEG2RawPictureDisplayExtension picture_display;
 181     } data;
 182 } MPEG2RawExtensionData;
 183
 184 typedef struct MPEG2RawSliceHeader {
 185     uint8_t slice_vertical_position;
 186
 187     uint8_t slice_vertical_position_extension;
 188     uint8_t priority_breakpoint;
 189
 190     uint8_t quantiser_scale_code;
 191
 192     uint8_t slice_extension_flag;
 193     uint8_t intra_slice;
 194     uint8_t slice_picture_id_enable;
 195     uint8_t slice_picture_id;
 196
 197     uint8_t extra_bit_slice;
 198
 199     size_t extra_information_length;
 200     uint8_t *extra_information;
 201     AVBufferRef *extra_information_ref;
 202 } MPEG2RawSliceHeader;
 203
 204 typedef struct MPEG2RawSlice {
 205     MPEG2RawSliceHeader header;
 206
 207     uint8_t *data;
 208     size_t   data_size;
 209     int      data_bit_start;
 210     AVBufferRef *data_ref;
 211 } MPEG2RawSlice;
 212
 213
 214 typedef struct CodedBitstreamMPEG2Context {
 215     // Elements stored in headers which are required for other decoding.
 216     uint16_t horizontal_size;
 217     uint16_t vertical_size;
 218     uint8_t scalable;
 219     uint8_t scalable_mode;
 220     uint8_t progressive_sequence;
 221     uint8_t number_of_frame_centre_offsets;
 222
 223     // Write buffer.
 224     uint8_t *write_buffer;
 225     size_t write_buffer_size;
 226 } CodedBitstreamMPEG2Context;
 227
 228
 229 #endif /* AVCODEC_CBS_MPEG2_H */