MrBesen
/
ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

avcodec/hevc_sei: parse and export Film Grain Characteristics SEI messages 

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2021-07-23 14:10:00 -03:00
parent 794e15fd54
commit 82be9f2777
3 changed files with 122 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
libavcodec/hevc_sei.c
View File

@ -395,6 +395,48 @@ static int decode_nal_sei_timecode(HEVCSEITimeCode *s, GetBitContext *gb)
return 0;
}
static int decode_film_grain_characteristics(HEVCSEIFilmGrainCharacteristics *h,
GetBitContext *gb)
{
h->present = !get_bits1(gb); // film_grain_characteristics_cancel_flag
if (h->present) {
memset(h, 0, sizeof(*h));
h->model_id = get_bits(gb, 2);
h->separate_colour_description_present_flag = get_bits1(gb);
if (h->separate_colour_description_present_flag) {
h->bit_depth_luma = get_bits(gb, 3) + 8;
h->bit_depth_chroma = get_bits(gb, 3) + 8;
h->full_range = get_bits1(gb);
h->color_primaries = get_bits(gb, 8);
h->transfer_characteristics = get_bits(gb, 8);
h->matrix_coeffs = get_bits(gb, 8);
}
h->blending_mode_id = get_bits(gb, 2);
h->log2_scale_factor = get_bits(gb, 4);
for (int c = 0; c < 3; c++)
h->comp_model_present_flag[c] = get_bits1(gb);
for (int c = 0; c < 3; c++) {
if (h->comp_model_present_flag[c]) {
h->num_intensity_intervals[c] = get_bits(gb, 8) + 1;
h->num_model_values[c] = get_bits(gb, 3) + 1;
if (h->num_model_values[c] > 6)
return AVERROR_INVALIDDATA;
for (int i = 0; i < h->num_intensity_intervals[c]; i++) {
h->intensity_interval_lower_bound[c][i] = get_bits(gb, 8);
h->intensity_interval_upper_bound[c][i] = get_bits(gb, 8);
for (int j = 0; j < h->num_model_values[c]; j++)
h->comp_model_value[c][i][j] = get_se_golomb_long(gb);
}
}
}
h->persistence_flag = get_bits1(gb);
h->present = 1;
}
return 0;
}
static int decode_nal_sei_prefix(GetBitContext *gb, void *logctx, HEVCSEI *s,
const HEVCParamSets *ps, int type, int size)
@ -422,6 +464,8 @@ static int decode_nal_sei_prefix(GetBitContext *gb, void *logctx, HEVCSEI *s,
return decode_nal_sei_alternative_transfer(&s->alternative_transfer, gb);
case SEI_TYPE_TIME_CODE:
return decode_nal_sei_timecode(&s->timecode, gb);
case SEI_TYPE_FILM_GRAIN_CHARACTERISTICS:
return decode_film_grain_characteristics(&s->film_grain_characteristics, gb);
default:
av_log(logctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", type);
skip_bits_long(gb, 8 * size);

22
libavcodec/hevc_sei.h
View File

@ -109,6 +109,27 @@ typedef struct HEVCSEITimeCode {
int32_t time_offset_value[3];
} HEVCSEITimeCode;
typedef struct HEVCSEIFilmGrainCharacteristics {
int present;
int model_id;
int separate_colour_description_present_flag;
int bit_depth_luma;
int bit_depth_chroma;
int full_range;
int color_primaries;
int transfer_characteristics;
int matrix_coeffs;
int blending_mode_id;
int log2_scale_factor;
int comp_model_present_flag[3];
uint16_t num_intensity_intervals[3];
uint8_t num_model_values[3];
uint8_t intensity_interval_lower_bound[3][256];
uint8_t intensity_interval_upper_bound[3][256];
int16_t comp_model_value[3][256][6];
int persistence_flag;
} HEVCSEIFilmGrainCharacteristics;
typedef struct HEVCSEI {
HEVCSEIPictureHash picture_hash;
HEVCSEIFramePacking frame_packing;
@ -122,6 +143,7 @@ typedef struct HEVCSEI {
int active_seq_parameter_set_id;
HEVCSEIAlternativeTransfer alternative_transfer;
HEVCSEITimeCode timecode;
HEVCSEIFilmGrainCharacteristics film_grain_characteristics;
} HEVCSEI;
struct HEVCParamSets;

56
libavcodec/hevcdec.c
View File

@ -26,6 +26,7 @@
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "libavutil/display.h"
#include "libavutil/film_grain_params.h"
#include "libavutil/internal.h"
#include "libavutil/mastering_display_metadata.h"
#include "libavutil/md5.h"
@ -2880,6 +2881,61 @@ static int set_side_data(HEVCContext *s)
s->sei.timecode.num_clock_ts = 0;
}
if (s->sei.film_grain_characteristics.present &&
(s->avctx->export_side_data & AV_CODEC_EXPORT_DATA_FILM_GRAIN)) {
HEVCSEIFilmGrainCharacteristics *fgc = &s->sei.film_grain_characteristics;
AVFilmGrainParams *fgp = av_film_grain_params_create_side_data(out);
if (!fgp)
return AVERROR(ENOMEM);
fgp->type = AV_FILM_GRAIN_PARAMS_H274;
fgp->codec.h274.model_id = fgc->model_id;
if (fgc->separate_colour_description_present_flag) {
fgp->codec.h274.bit_depth_luma = fgc->bit_depth_luma;
fgp->codec.h274.bit_depth_chroma = fgc->bit_depth_chroma;
fgp->codec.h274.color_range = fgc->full_range + 1;
fgp->codec.h274.color_primaries = fgc->color_primaries;
fgp->codec.h274.color_trc = fgc->transfer_characteristics;
fgp->codec.h274.color_space = fgc->matrix_coeffs;
} else {
const HEVCSPS *sps = s->ps.sps;
const VUI *vui = &sps->vui;
fgp->codec.h274.bit_depth_luma = sps->bit_depth;
fgp->codec.h274.bit_depth_chroma = sps->bit_depth_chroma;
if (vui->video_signal_type_present_flag)
fgp->codec.h274.color_range = vui->video_full_range_flag + 1;
else
fgp->codec.h274.color_range = AVCOL_RANGE_UNSPECIFIED;
if (vui->colour_description_present_flag) {
fgp->codec.h274.color_primaries = vui->colour_primaries;
fgp->codec.h274.color_trc = vui->transfer_characteristic;
fgp->codec.h274.color_space = vui->matrix_coeffs;
} else {
fgp->codec.h274.color_primaries = AVCOL_PRI_UNSPECIFIED;
fgp->codec.h274.color_trc = AVCOL_TRC_UNSPECIFIED;
fgp->codec.h274.color_space = AVCOL_SPC_UNSPECIFIED;
}
}
fgp->codec.h274.blending_mode_id = fgc->blending_mode_id;
fgp->codec.h274.log2_scale_factor = fgc->log2_scale_factor;
memcpy(&fgp->codec.h274.component_model_present, &fgc->comp_model_present_flag,
sizeof(fgp->codec.h274.component_model_present));
memcpy(&fgp->codec.h274.num_intensity_intervals, &fgc->num_intensity_intervals,
sizeof(fgp->codec.h274.num_intensity_intervals));
memcpy(&fgp->codec.h274.num_model_values, &fgc->num_model_values,
sizeof(fgp->codec.h274.num_model_values));
memcpy(&fgp->codec.h274.intensity_interval_lower_bound, &fgc->intensity_interval_lower_bound,
sizeof(fgp->codec.h274.intensity_interval_lower_bound));
memcpy(&fgp->codec.h274.intensity_interval_upper_bound, &fgc->intensity_interval_upper_bound,
sizeof(fgp->codec.h274.intensity_interval_upper_bound));
memcpy(&fgp->codec.h274.comp_model_value, &fgc->comp_model_value,
sizeof(fgp->codec.h274.comp_model_value));
fgc->present = fgc->persistence_flag;
}
if (s->sei.dynamic_hdr_plus.info) {
AVBufferRef *info_ref = av_buffer_ref(s->sei.dynamic_hdr_plus.info);
if (!info_ref)