From: Yue Heng <yue.h...@intel.com>
Enable dynamic QP configuration in runtime on qsv encoder. Through
AVFrame->metadata, we can set key "qsv_config_qp" to change QP
configuration when we encode video in CQP mode.
Signed-off-by: Yue Heng <yue.h...@intel.com>
Signed-off-by: Wenbin Chen <wenbin.c...@intel.com>
---
doc/encoders.texi | 9 +++++++
libavcodec/qsvenc.c | 59 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 68 insertions(+)
diff --git a/doc/encoders.texi b/doc/encoders.texi
index 9796a606fa..1eb75e199a 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -3333,6 +3333,15 @@ Forcing I frames as IDR frames.
For encoders set this flag to ON to reduce power consumption and GPU usage.
@end table
+@subsection Runtime Options
+Following options can be used durning qsv encoding.
+
+@table @option
+@item @var{qsv_config_qp}
+This option can be set in per-frame metadata. QP parameter can be dynamically
+changed when encode in CQP mode.
+@end table
+
@subsection H264 options
These options are used by h264_qsv
diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c
index 2b3b06767d..52462950be 100644
--- a/libavcodec/qsvenc.c
+++ b/libavcodec/qsvenc.c
@@ -146,6 +146,14 @@ static const struct {
{ MFX_RATECONTROL_QVBR, "QVBR" },
};
+#define UPDATE_PARAM(a, b) \
+do { \
+ if ((a) != (b)) { \
+ a = b; \
+ updated = 1; \
+ } \
+} while (0) \
+
static const char *print_ratecontrol(mfxU16 rc_mode)
{
int i;
@@ -1520,6 +1528,53 @@ static void print_interlace_msg(AVCodecContext *avctx,
QSVEncContext *q)
}
}
+static int update_qp(AVCodecContext *avctx, QSVEncContext *q,
+ const AVFrame *frame)
+{
+ int updated = 0, qp = 0, new_qp;
+ AVDictionaryEntry *entry = av_dict_get(frame->metadata, "qsv_config_qp",
+ NULL, 0);
+ if (entry && q->param.mfx.RateControlMethod == MFX_RATECONTROL_CQP) {
+ qp = atoi(entry->value);
+ av_log(avctx, AV_LOG_DEBUG, "Configure qp: %d\n",qp);
+ if (qp < 0 || qp > 51)
+ av_log(avctx, AV_LOG_WARNING, "Invalid qp, clip to 0 ~ 51\n");
+
+ qp = av_clip(qp, 0, 51);
+ UPDATE_PARAM(q->param.mfx.QPP, qp);
+ new_qp = av_clip(qp * fabs(avctx->i_quant_factor) +
+ avctx->i_quant_offset, 0, 51);
+ UPDATE_PARAM(q->param.mfx.QPI, new_qp);
+ new_qp = av_clip(qp * fabs(avctx->b_quant_factor) +
+ avctx->b_quant_offset, 0, 51);
+ UPDATE_PARAM(q->param.mfx.QPB, new_qp);
+ av_log(avctx, AV_LOG_DEBUG,
+ "using fixed qp = %d/%d/%d for idr/p/b frames\n",
+ q->param.mfx.QPI, q->param.mfx.QPP, q->param.mfx.QPB);
+ }
+ return updated;
+}
+
+static int update_parameters(AVCodecContext *avctx, QSVEncContext *q,
+ const AVFrame *frame)
+{
+ int needReset = 0, ret = 0;
+
+ if (!frame)
+ return 0;
+
+ needReset = update_qp(avctx, q, frame);
+ if (needReset) {
+ q->param.ExtParam = q->extparam_internal;
+ q->param.NumExtParam = q->nb_extparam_internal;
+ av_log(avctx, AV_LOG_DEBUG, "Parameter change, call msdk reset.\n");
+ ret = MFXVideoENCODE_Reset(q->session, &q->param);
+ if (ret < 0)
+ return ff_qsv_print_error(avctx, ret, "Error during resetting");
+ }
+ return 0;
+}
+
static int encode_frame(AVCodecContext *avctx, QSVEncContext *q,
const AVFrame *frame)
{
@@ -1630,6 +1685,10 @@ int ff_qsv_encode(AVCodecContext *avctx, QSVEncContext
*q,
{
int ret;
+ ret = update_parameters(avctx, q, frame);
+ if (ret < 0)
+ return ret;
+
ret = encode_frame(avctx, q, frame);
if (ret < 0)
return ret;
--
2.32.0
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