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avcodec/cbs_h265: add support for Alpha Channel Info SEI messages

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As defined in sections F.14.2.8 and F.14.3.8

Reviewed-by: Mark Thompson <sw@jkqxz.net>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2019-06-20 22:21:26 -03:00
parent d4035ca849
commit e460dcc832
4 changed files with 43 additions and 0 deletions
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29
libavcodec/cbs_h265_syntax_template.c
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@@ -2028,6 +2028,34 @@ static int FUNC(sei_alternative_transfer_characteristics)(CodedBitstreamContext
return 0;
}
static int FUNC(sei_alpha_channel_info)(CodedBitstreamContext *ctx,
RWContext *rw,
H265RawSEIAlphaChannelInfo *current)
{
int err, length;
HEADER("Alpha Channel Information");
flag(alpha_channel_cancel_flag);
if (!current->alpha_channel_cancel_flag) {
ub(3, alpha_channel_use_idc);
ub(3, alpha_channel_bit_depth_minus8);
length = current->alpha_channel_bit_depth_minus8 + 9;
ub(length, alpha_transparent_value);
ub(length, alpha_opaque_value);
flag(alpha_channel_incr_flag);
flag(alpha_channel_clip_flag);
if (current->alpha_channel_clip_flag)
flag(alpha_channel_clip_type_flag);
} else {
infer(alpha_channel_use_idc, 2);
infer(alpha_channel_incr_flag, 0);
infer(alpha_channel_clip_flag, 0);
}
return 0;
}
static int FUNC(sei_payload)(CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIPayload *current, int prefix)
{
@@ -2080,6 +2108,7 @@ static int FUNC(sei_payload)(CodedBitstreamContext *ctx, RWContext *rw,
SEI_TYPE_N(CONTENT_LIGHT_LEVEL_INFO, 1, 0, content_light_level);
SEI_TYPE_N(ALTERNATIVE_TRANSFER_CHARACTERISTICS,
1, 0, alternative_transfer_characteristics);
SEI_TYPE_N(ALPHA_CHANNEL_INFO, 1, 0, alpha_channel_info);
#undef SEI_TYPE
default: