mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-19 08:11:16 +00:00
498 lines
12 KiB
C
498 lines
12 KiB
C
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#include "dirac_parse.h"
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#include <string.h>
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#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
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typedef struct _Unpack Unpack;
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struct _Unpack
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{
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unsigned char *data;
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int n_bits_left;
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int index;
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int guard_bit;
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};
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static void schro_unpack_init_with_data (Unpack * unpack, unsigned char *data,
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int n_bytes, unsigned int guard_bit);
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static unsigned int schro_unpack_decode_bit (Unpack * unpack);
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static unsigned int schro_unpack_decode_uint (Unpack * unpack);
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void schro_video_format_set_std_video_format (DiracSequenceHeader * format,
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int index);
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void schro_video_format_set_std_frame_rate (DiracSequenceHeader * format,
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int index);
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void schro_video_format_set_std_aspect_ratio (DiracSequenceHeader * format,
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int index);
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void schro_video_format_set_std_signal_range (DiracSequenceHeader * format,
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int index);
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void schro_video_format_set_std_colour_spec (DiracSequenceHeader * format,
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int index);
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int
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dirac_sequence_header_parse (DiracSequenceHeader * header,
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unsigned char *data, int n_bytes)
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{
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int bit;
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int index;
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Unpack _unpack;
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Unpack *unpack = &_unpack;
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int major_version;
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int minor_version;
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int profile;
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int level;
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memset (header, 0, sizeof (*header));
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schro_unpack_init_with_data (unpack, data, n_bytes, 1);
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/* parse parameters */
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major_version = schro_unpack_decode_uint (unpack);
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minor_version = schro_unpack_decode_uint (unpack);
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profile = schro_unpack_decode_uint (unpack);
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level = schro_unpack_decode_uint (unpack);
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/* base video header */
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index = schro_unpack_decode_uint (unpack);
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schro_video_format_set_std_video_format (header, index);
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header->major_version = major_version;
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header->minor_version = minor_version;
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header->profile = profile;
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header->level = level;
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/* source parameters */
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/* frame dimensions */
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bit = schro_unpack_decode_bit (unpack);
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if (bit) {
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header->width = schro_unpack_decode_uint (unpack);
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header->height = schro_unpack_decode_uint (unpack);
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}
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/* chroma header */
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bit = schro_unpack_decode_bit (unpack);
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if (bit) {
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header->chroma_format = schro_unpack_decode_uint (unpack);
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}
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/* scan header */
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bit = schro_unpack_decode_bit (unpack);
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if (bit) {
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header->interlaced = schro_unpack_decode_uint (unpack);
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}
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/* frame rate */
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bit = schro_unpack_decode_bit (unpack);
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if (bit) {
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index = schro_unpack_decode_uint (unpack);
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if (index == 0) {
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header->frame_rate_numerator = schro_unpack_decode_uint (unpack);
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header->frame_rate_denominator = schro_unpack_decode_uint (unpack);
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} else {
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schro_video_format_set_std_frame_rate (header, index);
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}
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}
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/* aspect ratio */
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bit = schro_unpack_decode_bit (unpack);
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if (bit) {
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index = schro_unpack_decode_uint (unpack);
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if (index == 0) {
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header->aspect_ratio_numerator = schro_unpack_decode_uint (unpack);
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header->aspect_ratio_denominator = schro_unpack_decode_uint (unpack);
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} else {
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schro_video_format_set_std_aspect_ratio (header, index);
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}
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}
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/* clean area */
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bit = schro_unpack_decode_bit (unpack);
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if (bit) {
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header->clean_width = schro_unpack_decode_uint (unpack);
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header->clean_height = schro_unpack_decode_uint (unpack);
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header->left_offset = schro_unpack_decode_uint (unpack);
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header->top_offset = schro_unpack_decode_uint (unpack);
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}
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/* signal range */
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bit = schro_unpack_decode_bit (unpack);
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if (bit) {
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index = schro_unpack_decode_uint (unpack);
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if (index == 0) {
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header->luma_offset = schro_unpack_decode_uint (unpack);
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header->luma_excursion = schro_unpack_decode_uint (unpack);
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header->chroma_offset = schro_unpack_decode_uint (unpack);
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header->chroma_excursion = schro_unpack_decode_uint (unpack);
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} else {
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schro_video_format_set_std_signal_range (header, index);
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}
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}
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/* colour spec */
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bit = schro_unpack_decode_bit (unpack);
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if (bit) {
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index = schro_unpack_decode_uint (unpack);
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schro_video_format_set_std_colour_spec (header, index);
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if (index == 0) {
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/* colour primaries */
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bit = schro_unpack_decode_bit (unpack);
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if (bit) {
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header->colour_primaries = schro_unpack_decode_uint (unpack);
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}
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/* colour matrix */
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bit = schro_unpack_decode_bit (unpack);
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if (bit) {
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header->colour_matrix = schro_unpack_decode_uint (unpack);
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}
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/* transfer function */
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bit = schro_unpack_decode_bit (unpack);
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if (bit) {
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header->transfer_function = schro_unpack_decode_uint (unpack);
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}
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}
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}
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header->interlaced_coding = schro_unpack_decode_uint (unpack);
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return 1;
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}
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/* standard stuff */
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static DiracSequenceHeader schro_video_formats[] = {
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{0, 0, 0, 0,
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0, /* custom */
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640, 480, SCHRO_CHROMA_420,
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FALSE, FALSE,
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24000, 1001, 1, 1,
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640, 480, 0, 0,
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0, 255, 128, 255,
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0, 0, 0},
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{0, 0, 0, 0,
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1, /* QSIF525 */
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176, 120, SCHRO_CHROMA_420,
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FALSE, FALSE,
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15000, 1001, 10, 11,
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176, 120, 0, 0,
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0, 255, 128, 255,
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1, 1, 0},
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{0, 0, 0, 0,
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2, /* QCIF */
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176, 144, SCHRO_CHROMA_420,
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FALSE, TRUE,
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25, 2, 12, 11,
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176, 144, 0, 0,
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0, 255, 128, 255,
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2, 1, 0},
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{0, 0, 0, 0,
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3, /* SIF525 */
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352, 240, SCHRO_CHROMA_420,
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FALSE, FALSE,
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15000, 1001, 10, 11,
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352, 240, 0, 0,
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0, 255, 128, 255,
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1, 1, 0},
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{0, 0, 0, 0,
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4, /* CIF */
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352, 288, SCHRO_CHROMA_420,
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FALSE, TRUE,
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25, 2, 12, 11,
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352, 288, 0, 0,
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0, 255, 128, 255,
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2, 1, 0},
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{0, 0, 0, 0,
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5, /* 4SIF525 */
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704, 480, SCHRO_CHROMA_420,
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FALSE, FALSE,
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15000, 1001, 10, 11,
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704, 480, 0, 0,
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0, 255, 128, 255,
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1, 1, 0},
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{0, 0, 0, 0,
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6, /* 4CIF */
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704, 576, SCHRO_CHROMA_420,
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FALSE, TRUE,
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25, 2, 12, 11,
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704, 576, 0, 0,
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0, 255, 128, 255,
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2, 1, 0},
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{0, 0, 0, 0,
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7, /* SD480I-60 */
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720, 480, SCHRO_CHROMA_422,
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TRUE, FALSE,
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30000, 1001, 10, 11,
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704, 480, 8, 0,
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64, 876, 512, 896,
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1, 1, 0},
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{0, 0, 0, 0,
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8, /* SD576I-50 */
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720, 576, SCHRO_CHROMA_422,
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TRUE, TRUE,
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25, 1, 12, 11,
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704, 576, 8, 0,
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64, 876, 512, 896,
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2, 1, 0},
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{0, 0, 0, 0,
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9, /* HD720P-60 */
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1280, 720, SCHRO_CHROMA_422,
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FALSE, TRUE,
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60000, 1001, 1, 1,
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1280, 720, 0, 0,
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64, 876, 512, 896,
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0, 0, 0},
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{0, 0, 0, 0,
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10, /* HD720P-50 */
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1280, 720, SCHRO_CHROMA_422,
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FALSE, TRUE,
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50, 1, 1, 1,
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1280, 720, 0, 0,
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64, 876, 512, 896,
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0, 0, 0},
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{0, 0, 0, 0,
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11, /* HD1080I-60 */
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1920, 1080, SCHRO_CHROMA_422,
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TRUE, TRUE,
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30000, 1001, 1, 1,
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1920, 1080, 0, 0,
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64, 876, 512, 896,
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0, 0, 0},
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{0, 0, 0, 0,
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12, /* HD1080I-50 */
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1920, 1080, SCHRO_CHROMA_422,
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TRUE, TRUE,
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25, 1, 1, 1,
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1920, 1080, 0, 0,
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64, 876, 512, 896,
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0, 0, 0},
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{0, 0, 0, 0,
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13, /* HD1080P-60 */
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1920, 1080, SCHRO_CHROMA_422,
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FALSE, TRUE,
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60000, 1001, 1, 1,
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1920, 1080, 0, 0,
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64, 876, 512, 896,
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0, 0, 0},
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{0, 0, 0, 0,
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14, /* HD1080P-50 */
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1920, 1080, SCHRO_CHROMA_422,
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FALSE, TRUE,
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50, 1, 1, 1,
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1920, 1080, 0, 0,
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64, 876, 512, 896,
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0, 0, 0},
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{0, 0, 0, 0,
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15, /* DC2K */
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2048, 1080, SCHRO_CHROMA_444,
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FALSE, TRUE,
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24, 1, 1, 1,
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2048, 1080, 0, 0,
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256, 3504, 2048, 3584,
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3, 0, 0},
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{0, 0, 0, 0,
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16, /* DC4K */
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4096, 2160, SCHRO_CHROMA_444,
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FALSE, TRUE,
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24, 1, 1, 1,
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2048, 1536, 0, 0,
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256, 3504, 2048, 3584,
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3, 0, 0},
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};
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void
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schro_video_format_set_std_video_format (DiracSequenceHeader * format,
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int index)
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{
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if (index < 0 || index >= ARRAY_SIZE (schro_video_formats)) {
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return;
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}
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memcpy (format, schro_video_formats + index, sizeof (DiracSequenceHeader));
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}
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typedef struct _SchroFrameRate SchroFrameRate;
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struct _SchroFrameRate
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{
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int numerator;
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int denominator;
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};
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static SchroFrameRate schro_frame_rates[] = {
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{0, 0},
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{24000, 1001},
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{24, 1},
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{25, 1},
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{30000, 1001},
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{30, 1},
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{50, 1},
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{60000, 1001},
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{60, 1},
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{15000, 1001},
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{25, 2}
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};
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void
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schro_video_format_set_std_frame_rate (DiracSequenceHeader * format, int index)
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{
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if (index < 1 || index >= ARRAY_SIZE (schro_frame_rates)) {
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return;
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}
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format->frame_rate_numerator = schro_frame_rates[index].numerator;
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format->frame_rate_denominator = schro_frame_rates[index].denominator;
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}
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typedef struct _SchroPixelAspectRatio SchroPixelAspectRatio;
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struct _SchroPixelAspectRatio
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{
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int numerator;
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int denominator;
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};
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static const SchroPixelAspectRatio schro_aspect_ratios[] = {
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{0, 0},
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{1, 1},
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{10, 11},
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{12, 11},
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{40, 33},
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{16, 11},
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{4, 3}
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};
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void
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schro_video_format_set_std_aspect_ratio (DiracSequenceHeader * format,
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int index)
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{
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if (index < 1 || index >= ARRAY_SIZE (schro_aspect_ratios)) {
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return;
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}
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format->aspect_ratio_numerator = schro_aspect_ratios[index].numerator;
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format->aspect_ratio_denominator = schro_aspect_ratios[index].denominator;
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}
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typedef struct _SchroSignalRangeStruct SchroSignalRangeStruct;
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struct _SchroSignalRangeStruct
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{
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int luma_offset;
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int luma_excursion;
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int chroma_offset;
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int chroma_excursion;
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};
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static const SchroSignalRangeStruct schro_signal_ranges[] = {
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{0, 0, 0, 0},
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{0, 255, 128, 255},
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{16, 219, 128, 224},
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{64, 876, 512, 896},
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{256, 3504, 2048, 3584}
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};
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void
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schro_video_format_set_std_signal_range (DiracSequenceHeader * format, int i)
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{
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if (i < 1 || i >= ARRAY_SIZE (schro_signal_ranges)) {
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return;
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}
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format->luma_offset = schro_signal_ranges[i].luma_offset;
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format->luma_excursion = schro_signal_ranges[i].luma_excursion;
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format->chroma_offset = schro_signal_ranges[i].chroma_offset;
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format->chroma_excursion = schro_signal_ranges[i].chroma_excursion;
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}
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typedef struct _SchroColourSpecStruct SchroColourSpecStruct;
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struct _SchroColourSpecStruct
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{
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int colour_primaries;
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int colour_matrix;
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int transfer_function;
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};
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static const SchroColourSpecStruct schro_colour_specs[] = {
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{ /* Custom */
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SCHRO_COLOUR_PRIMARY_HDTV,
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SCHRO_COLOUR_MATRIX_HDTV,
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SCHRO_TRANSFER_CHAR_TV_GAMMA},
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{ /* SDTV 525 */
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SCHRO_COLOUR_PRIMARY_SDTV_525,
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SCHRO_COLOUR_MATRIX_SDTV,
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SCHRO_TRANSFER_CHAR_TV_GAMMA},
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{ /* SDTV 625 */
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SCHRO_COLOUR_PRIMARY_SDTV_625,
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SCHRO_COLOUR_MATRIX_SDTV,
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SCHRO_TRANSFER_CHAR_TV_GAMMA},
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{ /* HDTV */
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SCHRO_COLOUR_PRIMARY_HDTV,
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SCHRO_COLOUR_MATRIX_HDTV,
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SCHRO_TRANSFER_CHAR_TV_GAMMA},
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{ /* Cinema */
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SCHRO_COLOUR_PRIMARY_CINEMA,
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SCHRO_COLOUR_MATRIX_HDTV,
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SCHRO_TRANSFER_CHAR_TV_GAMMA}
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};
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void
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schro_video_format_set_std_colour_spec (DiracSequenceHeader * format, int i)
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{
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if (i < 0 || i >= ARRAY_SIZE (schro_colour_specs)) {
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return;
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}
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format->colour_primaries = schro_colour_specs[i].colour_primaries;
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format->colour_matrix = schro_colour_specs[i].colour_matrix;
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format->transfer_function = schro_colour_specs[i].transfer_function;
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}
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/* unpack */
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static void
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schro_unpack_init_with_data (Unpack * unpack, unsigned char *data,
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int n_bytes, unsigned int guard_bit)
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{
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memset (unpack, 0, sizeof (Unpack));
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unpack->data = data;
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unpack->n_bits_left = 8 * n_bytes;
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unpack->guard_bit = guard_bit;
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}
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static unsigned int
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schro_unpack_decode_bit (Unpack * unpack)
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{
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int bit;
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if (unpack->n_bits_left < 1) {
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return unpack->guard_bit;
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}
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bit = (unpack->data[unpack->index >> 3] >> (7 - (unpack->index & 7))) & 1;
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unpack->index++;
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unpack->n_bits_left--;
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return bit;
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}
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static unsigned int
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schro_unpack_decode_uint (Unpack * unpack)
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{
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int count;
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int value;
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count = 0;
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value = 0;
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while (!schro_unpack_decode_bit (unpack)) {
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count++;
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value <<= 1;
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value |= schro_unpack_decode_bit (unpack);
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}
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return (1 << count) - 1 + value;
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}
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