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codecs: h264: Fix DPB size calculation

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As per specification in A.3.1 h) and A.3.2 f), the maximum size of the DPB is
16. Fix the maximum in the fine and fix the formula to use MIN instead of MAX
so that we no longer always use the maximum for the profile/level.
This commit is contained in:
Nicolas Dufresne 2020-04-06 15:06:01 -04:00 committed by GStreamer Merge Bot
parent 00baed3ebe
commit b79c949789
2 changed files with 6 additions and 2 deletions
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5
gst-libs/gst/codecs/gsth264decoder.c
View file

@ -1684,9 +1684,12 @@ gst_h264_decoder_process_sps (GstH264Decoder * self, GstH264SPS * sps)
max_dpb_frames = MIN (max_dpb_mbs / (width_mb * height_mb),
GST_H264_DPB_MAX_SIZE);
max_dpb_size = MAX (max_dpb_frames,
max_dpb_size = MIN (max_dpb_frames,
MAX (sps->num_ref_frames, sps->vui_parameters.max_dec_frame_buffering));
/* Safety, so that subclass don't need bound checking */
g_return_val_if_fail (max_dpb_size <= GST_H264_DPB_MAX_SIZE, FALSE);
prev_max_dpb_size = gst_h264_dpb_get_max_num_pics (priv->dpb);
if (priv->width != sps->width || priv->height != sps->height ||
prev_max_dpb_size != max_dpb_size) {

3
gst-libs/gst/codecs/gsth264picture.h
View file

@ -34,7 +34,8 @@ G_BEGIN_DECLS
typedef struct _GstH264Slice GstH264Slice;
typedef struct _GstH264Picture GstH264Picture;
#define GST_H264_DPB_MAX_SIZE 32
/* As specified in A.3.1 h) and A.3.2 f) */
#define GST_H264_DPB_MAX_SIZE 16
struct _GstH264Slice
{