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

cbs_h264: add support for Film Grain Characteristics SEI messages 

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2021-07-23 11:05:04 -03:00
parent c4042fc1e3
commit 41d1dba4d2
3 changed files with 110 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
libavcodec/cbs_h264.h
View File

@ -272,6 +272,27 @@ typedef struct H264RawSEIRecoveryPoint {
uint8_t changing_slice_group_idc;
} H264RawSEIRecoveryPoint;
typedef struct H264RawFilmGrainCharacteristics {
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_coefficients;
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_repetition_period;
} H264RawFilmGrainCharacteristics;
typedef struct H264RawSEIDisplayOrientation {
uint8_t display_orientation_cancel_flag;
uint8_t hor_flip;

6
libavcodec/cbs_h2645.c
View File

@ -1570,6 +1570,12 @@ static const SEIMessageTypeDescriptor cbs_sei_h264_types[] = {
sizeof(H264RawSEIRecoveryPoint),
SEI_MESSAGE_RW(h264, sei_recovery_point),
},
{
SEI_TYPE_FILM_GRAIN_CHARACTERISTICS,
1, 0,
sizeof(H264RawFilmGrainCharacteristics),
SEI_MESSAGE_RW(h264, film_grain_characteristics),
},
{
SEI_TYPE_DISPLAY_ORIENTATION,
1, 0,

83
libavcodec/cbs_h264_syntax_template.c
View File

@ -719,6 +719,89 @@ static int FUNC(sei_recovery_point)(CodedBitstreamContext *ctx, RWContext *rw,
return 0;
}
static int FUNC(film_grain_characteristics)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawFilmGrainCharacteristics *current,
SEIMessageState *state)
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
const H264RawSPS *sps;
int err, c, i, j;
HEADER("Film Grain Characteristics");
sps = h264->active_sps;
if (!sps) {
// If there is exactly one possible SPS but it is not yet active
// then just assume that it should be the active one.
int i, k = -1;
for (i = 0; i < H264_MAX_SPS_COUNT; i++) {
if (h264->sps[i]) {
if (k >= 0) {
k = -1;
break;
}
k = i;
}
}
if (k >= 0)
sps = h264->sps[k];
}
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_coefficients);
} 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_coefficients, 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);
}
}
}
ue(film_grain_characteristics_repetition_period, 0, 16384);
}
return 0;
}
static int FUNC(sei_display_orientation)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIDisplayOrientation *current,
SEIMessageState *sei)