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avcodec/cbs_{h2645,sei}: add support for Ambient Viewing Environment SEI

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Defined by H.274, this SEI message is utilized by iPhones to save
the nominal ambient viewing environment for the display of recorded
HDR content.
This commit is contained in:
Jan Ekström 2023-01-09 22:49:49 +02:00
parent d3538dd293
commit f4bebc0c34
3 changed files with 29 additions and 0 deletions
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6
libavcodec/cbs_h2645.c
View File

@ -1500,6 +1500,12 @@ static const SEIMessageTypeDescriptor cbs_sei_common_types[] = {
sizeof(SEIRawAlternativeTransferCharacteristics),
SEI_MESSAGE_RW(sei, alternative_transfer_characteristics),
},
{
SEI_TYPE_AMBIENT_VIEWING_ENVIRONMENT,
1, 0,
sizeof(SEIRawAmbientViewingEnvironment),
SEI_MESSAGE_RW(sei, ambient_viewing_environment),
},
SEI_MESSAGE_TYPE_END,
};

6
libavcodec/cbs_sei.h
View File

@ -65,6 +65,12 @@ typedef struct SEIRawAlternativeTransferCharacteristics {
uint8_t preferred_transfer_characteristics;
} SEIRawAlternativeTransferCharacteristics;
typedef struct SEIRawAmbientViewingEnvironment {
uint32_t ambient_illuminance;
uint16_t ambient_light_x;
uint16_t ambient_light_y;
} SEIRawAmbientViewingEnvironment;
typedef struct SEIRawMessage {
uint32_t payload_type;
uint32_t payload_size;

17
libavcodec/cbs_sei_syntax_template.c
View File

@ -144,6 +144,23 @@ static int FUNC(alternative_transfer_characteristics)
return 0;
}
static int FUNC(ambient_viewing_environment)
(CodedBitstreamContext *ctx, RWContext *rw,
SEIRawAmbientViewingEnvironment *current,
SEIMessageState *state)
{
static const uint16_t max_ambient_light_value = 50000;
int err;
HEADER("Ambient Viewing Environment");
u(32, ambient_illuminance, 1, MAX_UINT_BITS(32));
u(16, ambient_light_x, 0, max_ambient_light_value);
u(16, ambient_light_y, 0, max_ambient_light_value);
return 0;
}
static int FUNC(message)(CodedBitstreamContext *ctx, RWContext *rw,
SEIRawMessage *current)
{