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encoder: h264: fix level lookup constraints wrt. bitrate.

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Fix the level calculation involving bitrate limits. Since we are
targetting NAL HRD conformance, the check against MaxBR from the
Table A-1 limits shall involve cpbBrNalFactor depending on the
active profile.
This commit is contained in:
Gwenole Beauchesne 2014-01-22 11:25:13 +01:00
parent 1e502d63d5
commit 4c04a1bc88
1 changed files with 29 additions and 2 deletions
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31
gst-libs/gst/vaapi/gstvaapiencoder_h264.c
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@ -123,6 +123,31 @@ h264_get_log2_max_frame_num (guint num)
return ret;
}
/* Determines the cpbBrNalFactor based on the supplied profile */
static guint
h264_get_cpb_nal_factor (GstVaapiProfile profile)
{
guint f;
/* Table A-2 */
switch (profile) {
case GST_VAAPI_PROFILE_H264_HIGH:
f = 1500;
break;
case GST_VAAPI_PROFILE_H264_HIGH10:
f = 3600;
break;
case GST_VAAPI_PROFILE_H264_HIGH_422:
case GST_VAAPI_PROFILE_H264_HIGH_444:
f = 4800;
break;
default:
f = 1200;
break;
}
return f;
}
/* ------------------------------------------------------------------------- */
/* --- H.264 Bitstream Writer --- */
/* ------------------------------------------------------------------------- */
@ -718,7 +743,8 @@ ensure_profile (GstVaapiEncoderH264 * encoder)
static gboolean
ensure_level (GstVaapiEncoderH264 * encoder)
{
const guint bitrate = GST_VAAPI_ENCODER_CAST (encoder)->bitrate;
const guint cpb_factor = h264_get_cpb_nal_factor (encoder->profile);
const guint bitrate = GST_VAAPI_ENCODER_CAST (encoder)->bitrate * 1000;
const GstVaapiH264LevelLimits *limits_table;
guint i, num_limits, PicSizeMbs, MaxDpbMbs, MaxMBPS;
@ -732,7 +758,8 @@ ensure_level (GstVaapiEncoderH264 * encoder)
const GstVaapiH264LevelLimits *const limits = &limits_table[i];
if (PicSizeMbs <= limits->MaxFS &&
MaxDpbMbs <= limits->MaxDpbMbs &&
MaxMBPS <= limits->MaxMBPS && (!bitrate || bitrate <= limits->MaxBR))
MaxMBPS <= limits->MaxMBPS && (!bitrate
|| bitrate <= (limits->MaxBR * cpb_factor)))
break;
}
if (i == num_limits)