On 1/10/2023 6:19 PM, Jan Ekström wrote:
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. --- libavcodec/cbs_h2645.c | 6 ++++++ libavcodec/cbs_sei.h | 6 ++++++ libavcodec/cbs_sei_syntax_template.c | 17 +++++++++++++++++ 3 files changed, 29 insertions(+)diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c index 4ee06003c3..80e48829af 100644 --- a/libavcodec/cbs_h2645.c +++ b/libavcodec/cbs_h2645.c @@ -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, };diff --git a/libavcodec/cbs_sei.h b/libavcodec/cbs_sei.hindex c7a7a95be0..1c327a4689 100644 --- a/libavcodec/cbs_sei.h +++ b/libavcodec/cbs_sei.h @@ -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; diff --git a/libavcodec/cbs_sei_syntax_template.c b/libavcodec/cbs_sei_syntax_template.c index 0ef7b42ed9..6a7cc36dda 100644 --- a/libavcodec/cbs_sei_syntax_template.c +++ b/libavcodec/cbs_sei_syntax_template.c @@ -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) {
Should be ok. _______________________________________________ ffmpeg-devel mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
