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avcodec/h264_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 11:06:45 -03:00
parent e3b5ff17c2
commit 4ff73add5d
3 changed files with 123 additions and 0 deletions
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47
libavcodec/h264_sei.c
View File

@ -55,6 +55,7 @@ void ff_h264_sei_uninit(H264SEIContext *h)
h->picture_timing.present = 0;
h->buffering_period.present = 0;
h->frame_packing.present = 0;
h->film_grain_characteristics.present = 0;
h->display_orientation.present = 0;
h->afd.present = 0;
@ -416,6 +417,49 @@ static int decode_alternative_transfer(H264SEIAlternativeTransfer *h,
return 0;
}
static int decode_film_grain_characteristics(H264SEIFilmGrainCharacteristics *h,
GetBitContext *gb)
{
int film_grain_characteristics_cancel_flag = get_bits1(gb);
if (!film_grain_characteristics_cancel_flag) {
memset(h, 0, sizeof(*h));
h->model_id = get_bits(gb, 8);
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->repetition_period = get_ue_golomb_long(gb);
h->present = 1;
}
return 0;
}
int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb,
const H264ParamSets *ps, void *logctx)
{
@ -477,6 +521,9 @@ int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb,
case SEI_TYPE_ALTERNATIVE_TRANSFER_CHARACTERISTICS:
ret = decode_alternative_transfer(&h->alternative_transfer, &gb_payload);
break;
case SEI_TYPE_FILM_GRAIN_CHARACTERISTICS:
ret = decode_film_grain_characteristics(&h->film_grain_characteristics, &gb_payload);
break;
default:
av_log(logctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
}

22
libavcodec/h264_sei.h
View File

@ -165,6 +165,27 @@ typedef struct H264SEIAlternativeTransfer {
int preferred_transfer_characteristics;
} H264SEIAlternativeTransfer;
typedef struct H264SEIFilmGrainCharacteristics {
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 repetition_period;
} H264SEIFilmGrainCharacteristics;
typedef struct H264SEIContext {
H264SEIPictureTiming picture_timing;
H264SEIAFD afd;
@ -176,6 +197,7 @@ typedef struct H264SEIContext {
H264SEIDisplayOrientation display_orientation;
H264SEIGreenMetaData green_metadata;
H264SEIAlternativeTransfer alternative_transfer;
H264SEIFilmGrainCharacteristics film_grain_characteristics;
} H264SEIContext;
struct H264ParamSets;

54
libavcodec/h264_slice.c
View File

@ -28,6 +28,7 @@
#include "libavutil/avassert.h"
#include "libavutil/display.h"
#include "libavutil/imgutils.h"
#include "libavutil/film_grain_params.h"
#include "libavutil/stereo3d.h"
#include "libavutil/timecode.h"
#include "internal.h"
@ -1330,6 +1331,59 @@ static int h264_export_frame_props(H264Context *h)
}
h->sei.unregistered.nb_buf_ref = 0;
if (h->sei.film_grain_characteristics.present &&
(h->avctx->export_side_data & AV_CODEC_EXPORT_DATA_FILM_GRAIN)) {
H264SEIFilmGrainCharacteristics *fgc = &h->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 {
fgp->codec.h274.bit_depth_luma = sps->bit_depth_luma;
fgp->codec.h274.bit_depth_chroma = sps->bit_depth_chroma;
if (sps->video_signal_type_present_flag)
fgp->codec.h274.color_range = sps->full_range + 1;
else
fgp->codec.h274.color_range = AVCOL_RANGE_UNSPECIFIED;
if (sps->colour_description_present_flag) {
fgp->codec.h274.color_primaries = sps->color_primaries;
fgp->codec.h274.color_trc = sps->color_trc;
fgp->codec.h274.color_space = sps->colorspace;
} 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->repetition_period;
}
if (h->sei.picture_timing.timecode_cnt > 0) {
uint32_t *tc_sd;
char tcbuf[AV_TIMECODE_STR_SIZE];