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lavc/videotoolboxenc: Support for forced I-frames 

Setting AVFrame.pic_type to AV_PICTURE_TYPE_I will force an I-frame.

Signed-off-by: Rick Kern <kernrj@gmail.com>
This commit is contained in:
Rick Kern 2016-04-27 10:53:13 -04:00 committed by wm4
parent 4b806081b2
commit 9d8a38d20b
1 changed files with 25 additions and 1 deletions
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26
libavcodec/videotoolboxenc.c
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@ -1414,27 +1414,51 @@ static int create_cv_pixel_buffer(AVCodecContext *avctx,
return 0;
}
static int create_encoder_dict_h264(const AVFrame *frame,
CFDictionaryRef* dict_out)
{
CFDictionaryRef dict = NULL;
if (frame->pict_type == AV_PICTURE_TYPE_I) {
const void *keys[] = { kVTEncodeFrameOptionKey_ForceKeyFrame };
const void *vals[] = { kCFBooleanTrue };
dict = CFDictionaryCreate(NULL, keys, vals, 1, NULL, NULL);
if(!dict) return AVERROR(ENOMEM);
}
*dict_out = dict;
return 0;
}
static int vtenc_send_frame(AVCodecContext *avctx,
VTEncContext *vtctx,
const AVFrame *frame)
{
CMTime time;
CFDictionaryRef frame_dict;
CVPixelBufferRef cv_img = NULL;
int status = create_cv_pixel_buffer(avctx, frame, &cv_img);
if (status) return status;
status = create_encoder_dict_h264(frame, &frame_dict);
if (status) {
CFRelease(cv_img);
return status;
}
time = CMTimeMake(frame->pts * avctx->time_base.num, avctx->time_base.den);
status = VTCompressionSessionEncodeFrame(
vtctx->session,
cv_img,
time,
kCMTimeInvalid,
NULL,
frame_dict,
NULL,
NULL
);
if (frame_dict) CFRelease(frame_dict);
CFRelease(cv_img);
if (status) {