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vaapi: improve a comment 

Try to actually explain what's up with this code.
This commit is contained in:
wm4 2017-01-28 18:36:00 +01:00
parent 443d3a91d3
commit 0aac7533dc
1 changed files with 7 additions and 1 deletions
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8
video/decode/hw_vaapi.c
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@ -45,7 +45,13 @@ struct priv {
static int init_decoder(struct lavc_ctx *ctx, int w, int h)
{
struct priv *p = ctx->hwdec_priv;
// From avconv_vaapi.c. Disgusting, but apparently this is the best we get.
// libavcodec has no way yet to communicate the exact surface format needed
// for the frame pool, or the required minimum size of the frame pool.
// Hopefully, this weakness in the libavcodec API will be fixed in the
// future.
// For the pixel format, we try to second-guess from what the libavcodec
// software decoder would require (sw_pix_fmt). It could break and require
// adjustment if new VAAPI surface formats are added.
int sw_format = ctx->avctx->sw_pix_fmt == AV_PIX_FMT_YUV420P10 ?
AV_PIX_FMT_P010 : AV_PIX_FMT_NV12;