b/libavutil/hdr_dynamic_metadata.c
@@ -225,3 +225,150 @@ int av_dynamic_hdr_plus_from_t35(AVDynamicHDRPlus
*s, const uint8_t *data,
return 0;
}
+
+AVBufferRef *av_dynamic_hdr_plus_to_t35(AVDynamicHDRPlus *s)
+{
+ AVBufferRef *buf;
+ size_t size_bits, size_bytes;
+ PutBitContext pbc, *pb = &pbc;
+
+ if (!s)
+ return NULL;
+
+ // Buffer size per CTA-861-H p.253-254:
+ size_bits =
+ // 56 bits for the header
+ 58 +
+ // 2 bits for num_windows
+ 2 +
+ // 937 bits for window geometry for each window above 1
+ FFMAX((s->num_windows - 1), 0) * 937 +
+ // 27 bits for targeted_system_display_maximum_luminance
+ 27 +
+ // 1-3855 bits for targeted system display peak luminance information
+ 1 + (s->targeted_system_display_actual_peak_luminance_flag ? 10 +
+ s->num_rows_targeted_system_display_actual_peak_luminance *
+ s->num_cols_targeted_system_display_actual_peak_luminance * 4 :
0) +
+ // 0-442 bits for intra-window pixel distribution information
+ s->num_windows * 82;
+ for (int w = 0; w < s->num_windows; w++) {
+ size_bits += s->params[w].num_distribution_maxrgb_percentiles * 24;
+ }
+ // 1-3855 bits for mastering display peak luminance information
+ size_bits += 1 + (s->mastering_display_actual_peak_luminance_flag ?
10 +
+ s->num_rows_mastering_display_actual_peak_luminance *
+ s->num_cols_mastering_display_actual_peak_luminance * 4 : 0) +
+ // 0-537 bits for per-window tonemapping information
+ s->num_windows * 1;
+ for (int w = 0; w < s->num_windows; w++) {
+ if (s->params[w].tone_mapping_flag) {
+ size_bits += 28 + s->params[w].num_bezier_curve_anchors * 10;
+ }
+ }
+ // 0-21 bits for per-window color saturation mapping information
+ size_bits += s->num_windows * 1;
+ for (int w = 0; w < s->num_windows; w++) {
+ if (s->params[w].color_saturation_mapping_flag) {
+ size_bits += 6;
+ }
+ }
+
+ size_bytes = (size_bits + 7) / 8;
+
+ buf = av_buffer_alloc(size_bytes);
+ if (!buf) {
+ return NULL;
+ }
+
+ init_put_bits(pb, buf->data, size_bytes);
+
+ // itu_t_t35_country_code shall be 0xB5 (USA)
+ put_bits(pb, 8, 0xB5);
+ // itu_t_t35_terminal_provider_code shall be 0x003C
+ put_bits(pb, 16, 0x003C);
+ // itu_t_t35_terminal_provider_oriented_code is set to ST 2094-40
+ put_bits(pb, 16, 0x0001);
+ // application_identifier shall be set to 4
+ put_bits(pb, 8, 4);
+ // application_mode is set to Application Version 1
+ put_bits(pb, 8, 1);
+
+ // Payload as per CTA-861-H p.253-254
+ put_bits(pb, 2, s->num_windows);
+
+ for (int w = 1; w < s->num_windows; w++) {
+ put_bits(pb, 16, s->params[w].window_upper_left_corner_x.num /
s->params[w].window_upper_left_corner_x.den);
+ put_bits(pb, 16, s->params[w].window_upper_left_corner_y.num /
s->params[w].window_upper_left_corner_y.den);
+ put_bits(pb, 16, s->params[w].window_lower_right_corner_x.num /
s->params[w].window_lower_right_corner_x.den);
+ put_bits(pb, 16, s->params[w].window_lower_right_corner_y.num /
s->params[w].window_lower_right_corner_y.den);
+ put_bits(pb, 16, s->params[w].center_of_ellipse_x);
+ put_bits(pb, 16, s->params[w].center_of_ellipse_y);
+ put_bits(pb, 8, s->params[w].rotation_angle);
+ put_bits(pb, 16, s->params[w].semimajor_axis_internal_ellipse);
+ put_bits(pb, 16, s->params[w].semimajor_axis_external_ellipse);
+ put_bits(pb, 16, s->params[w].semiminor_axis_external_ellipse);
+ put_bits(pb, 1, s->params[w].overlap_process_option);
+ }
+
+ put_bits(pb, 27, s->targeted_system_display_maximum_luminance.num *
luminance_den /
+ s->targeted_system_display_maximum_luminance.den);
+ put_bits(pb, 1, s->targeted_system_display_actual_peak_luminance_flag);
+ if (s->targeted_system_display_actual_peak_luminance_flag) {
+ put_bits(pb, 5,
s->num_rows_targeted_system_display_actual_peak_luminance);
+ put_bits(pb, 5,
s->num_cols_targeted_system_display_actual_peak_luminance);
+ for (int i = 0; i <
s->num_rows_targeted_system_display_actual_peak_luminance; i++) {
+ for (int j = 0; j <
s->num_cols_targeted_system_display_actual_peak_luminance; j++) {
+ put_bits(pb, 4,
s->targeted_system_display_actual_peak_luminance[i][j].num *
peak_luminance_den /
+ s->targeted_system_display_actual_peak_luminance[i][j].den);
+ }
+ }
+ }
+
+ for (int w = 0; w < s->num_windows; w++) {
+ for (int i = 0; i < 3; i++) {
+ put_bits(pb, 17, s->params[w].maxscl[i].num * rgb_den /
s->params[w].maxscl[i].den);
+ }
+ put_bits(pb, 17, s->params[w].average_maxrgb.num * rgb_den /
s->params[w].average_maxrgb.den);
+ put_bits(pb, 4, s->params[w].num_distribution_maxrgb_percentiles);
+ for (int i = 0; i <
s->params[w].num_distribution_maxrgb_percentiles; i++) {
+ put_bits(pb, 7,
s->params[w].distribution_maxrgb[i].percentage);
+ put_bits(pb, 17,
s->params[w].distribution_maxrgb[i].percentile.num * rgb_den /
+ s->params[w].distribution_maxrgb[i].percentile.den);
+ }
+ put_bits(pb, 10, s->params[w].fraction_bright_pixels.num *
fraction_pixel_den /
+ s->params[w].fraction_bright_pixels.den);
+ }
+
+ put_bits(pb, 1, s->mastering_display_actual_peak_luminance_flag);
+ if (s->mastering_display_actual_peak_luminance_flag) {
+ put_bits(pb, 5,
s->num_rows_mastering_display_actual_peak_luminance);
+ put_bits(pb, 5,
s->num_cols_mastering_display_actual_peak_luminance);
+ for (int i = 0; i <
s->num_rows_mastering_display_actual_peak_luminance; i++) {
+ for (int j = 0; j <
s->num_cols_mastering_display_actual_peak_luminance; j++) {
+ put_bits(pb, 4,
s->mastering_display_actual_peak_luminance[i][j].num * peak_luminance_den /
+ s->mastering_display_actual_peak_luminance[i][j].den);
+ }
+ }
+ }
+
+ for (int w = 0; w < s->num_windows; w++) {
+ put_bits(pb, 1, s->params[w].tone_mapping_flag);
+ if (s->params[w].tone_mapping_flag) {
+ put_bits(pb, 12, s->params[w].knee_point_x.num *
knee_point_den / s->params[w].knee_point_x.den);
+ put_bits(pb, 12, s->params[w].knee_point_y.num *
knee_point_den / s->params[w].knee_point_y.den);
+ put_bits(pb, 4, s->params[w].num_bezier_curve_anchors);
+ for (int i = 0; i < s->params[w].num_bezier_curve_anchors;
i++) {
+ put_bits(pb, 10,
s->params[w].bezier_curve_anchors[i].num * bezier_anchor_den /
+ s->params[w].bezier_curve_anchors[i].den);
+ }
+ put_bits(pb, 1, s->params[w].color_saturation_mapping_flag);
+ if (s->params[w].color_saturation_mapping_flag) {
+ put_bits(pb, 6,
s->params[w].color_saturation_weight.num * saturation_weight_den /
+ s->params[w].color_saturation_weight.den);
+ }
+ }
+ }
+
+ flush_put_bits(pb);
+ return buf;
+}
b/libavutil/hdr_dynamic_metadata.h
@@ -21,6 +21,7 @@
#ifndef AVUTIL_HDR_DYNAMIC_METADATA_H
#define AVUTIL_HDR_DYNAMIC_METADATA_H
+#include "buffer.h"
#include "frame.h"
#include "rational.h"
@@ -351,4 +352,13 @@ AVDynamicHDRPlus
*av_dynamic_hdr_plus_create_side_data(AVFrame *frame);
int av_dynamic_hdr_plus_from_t35(AVDynamicHDRPlus *s, const uint8_t *data,
int size);
+/**
+ * Serialize dynamic HDR10+ metadata to a user data registered ITU-T
T.35 buffer.
+ * @param s A pointer containing the decoded AVDynamicHDRPlus structure.
+ *
+ * @return Pointer to an AVBufferRef containing the raw ITU-T T.35
representation
+ * of the HDR10+ metadata if succeed, or NULL if buffer
allocation fails.
+ */
+AVBufferRef *av_dynamic_hdr_plus_to_t35(AVDynamicHDRPlus *s);
+
#endif /* AVUTIL_HDR_DYNAMIC_METADATA_H */
@@ -79,7 +79,7 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 58
-#define LIBAVUTIL_VERSION_MINOR 3
+#define LIBAVUTIL_VERSION_MINOR 4
#define LIBAVUTIL_VERSION_MICRO 100
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
--
2.39.1
See the previous patch for context. Signed-off-by: Raphaël Zumer <rzumer@tebako.net> --- libavutil/hdr_dynamic_metadata.c | 147 +++++++++++++++++++++++++++++++ libavutil/hdr_dynamic_metadata.h | 10 +++ libavutil/version.h | 2 +- 3 files changed, 158 insertions(+), 1 deletion(-)