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cbs_h265: add support for Film Grain Characteristics SEI message 

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2021-07-23 13:56:48 -03:00
parent 6b594ba5d1
commit 794e15fd54
3 changed files with 92 additions and 0 deletions
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6
libavcodec/cbs_h2645.c
View File

@ -1610,6 +1610,12 @@ static const SEIMessageTypeDescriptor cbs_sei_h265_types[] = {
sizeof(H265RawSEIRecoveryPoint),
SEI_MESSAGE_RW(h265, sei_recovery_point),
},
{
SEI_TYPE_FILM_GRAIN_CHARACTERISTICS,
1, 0,
sizeof(H265RawFilmGrainCharacteristics),
SEI_MESSAGE_RW(h265, film_grain_characteristics),
},
{
SEI_TYPE_DISPLAY_ORIENTATION,
1, 0,

21
libavcodec/cbs_h265.h
View File

@ -594,6 +594,27 @@ typedef struct H265RawSEIRecoveryPoint {
uint8_t broken_link_flag;
} H265RawSEIRecoveryPoint;
typedef struct H265RawFilmGrainCharacteristics {
uint8_t film_grain_characteristics_cancel_flag;
uint8_t film_grain_model_id;
uint8_t separate_colour_description_present_flag;
uint8_t film_grain_bit_depth_luma_minus8;
uint8_t film_grain_bit_depth_chroma_minus8;
uint8_t film_grain_full_range_flag;
uint8_t film_grain_colour_primaries;
uint8_t film_grain_transfer_characteristics;
uint8_t film_grain_matrix_coeffs;
uint8_t blending_mode_id;
uint8_t log2_scale_factor;
uint8_t comp_model_present_flag[3];
uint8_t num_intensity_intervals_minus1[3];
uint8_t num_model_values_minus1[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];
uint8_t film_grain_characteristics_persistence_flag;
} H265RawFilmGrainCharacteristics;
typedef struct H265RawSEIDisplayOrientation {
uint8_t display_orientation_cancel_flag;
uint8_t hor_flip;

65
libavcodec/cbs_h265_syntax_template.c
View File

@ -1844,6 +1844,71 @@ static int FUNC(sei_recovery_point)
return 0;
}
static int FUNC(film_grain_characteristics)(CodedBitstreamContext *ctx, RWContext *rw,
H265RawFilmGrainCharacteristics *current,
SEIMessageState *state)
{
CodedBitstreamH265Context *h265 = ctx->priv_data;
const H265RawSPS *sps = h265->active_sps;
int err, c, i, j;
HEADER("Film Grain Characteristics");
flag(film_grain_characteristics_cancel_flag);
if (!current->film_grain_characteristics_cancel_flag) {
int filmGrainBitDepth[3];
u(2, film_grain_model_id, 0, 1);
flag(separate_colour_description_present_flag);
if (current->separate_colour_description_present_flag) {
ub(3, film_grain_bit_depth_luma_minus8);
ub(3, film_grain_bit_depth_chroma_minus8);
flag(film_grain_full_range_flag);
ub(8, film_grain_colour_primaries);
ub(8, film_grain_transfer_characteristics);
ub(8, film_grain_matrix_coeffs);
} else {
if (!sps) {
av_log(ctx->log_ctx, AV_LOG_ERROR,
"No active SPS for film_grain_characteristics.\n");
return AVERROR_INVALIDDATA;
}
infer(film_grain_bit_depth_luma_minus8, sps->bit_depth_luma_minus8);
infer(film_grain_bit_depth_chroma_minus8, sps->bit_depth_chroma_minus8);
infer(film_grain_full_range_flag, sps->vui.video_full_range_flag);
infer(film_grain_colour_primaries, sps->vui.colour_primaries);
infer(film_grain_transfer_characteristics, sps->vui.transfer_characteristics);
infer(film_grain_matrix_coeffs, sps->vui.matrix_coefficients);
}
filmGrainBitDepth[0] = current->film_grain_bit_depth_luma_minus8 + 8;
filmGrainBitDepth[1] =
filmGrainBitDepth[2] = current->film_grain_bit_depth_chroma_minus8 + 8;
u(2, blending_mode_id, 0, 1);
ub(4, log2_scale_factor);
for (c = 0; c < 3; c++)
flags(comp_model_present_flag[c], 1, c);
for (c = 0; c < 3; c++) {
if (current->comp_model_present_flag[c]) {
ubs(8, num_intensity_intervals_minus1[c], 1, c);
us(3, num_model_values_minus1[c], 0, 5, 1, c);
for (i = 0; i <= current->num_intensity_intervals_minus1[c]; i++) {
ubs(8, intensity_interval_lower_bound[c][i], 2, c, i);
ubs(8, intensity_interval_upper_bound[c][i], 2, c, i);
for (j = 0; j <= current->num_model_values_minus1[c]; j++)
ses(comp_model_value[c][i][j], 0 - current->film_grain_model_id * (1 << (filmGrainBitDepth[c] - 1)),
((1 << filmGrainBitDepth[c]) - 1) - current->film_grain_model_id * (1 << (filmGrainBitDepth[c] - 1)),
3, c, i, j);
}
}
}
flag(film_grain_characteristics_persistence_flag);
}
return 0;
}
static int FUNC(sei_display_orientation)
(CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIDisplayOrientation *current, SEIMessageState *sei)