obs-qsv: Enable Content Adaptive Quantization

Allow user to enable Content Adaptive Quantization (MMBRC) if CPU is SKL
or newer

plugins/obs-qsv11/QSV_Encoder.h

@@ -100,6 +100,7 @@ typedef struct {
 	mfxU16 nKeyIntSec;
 	mfxU16 nbFrames;
 	mfxU16 nICQQuality;
+	bool bMBBRC;
 } qsv_param_t;
 
 enum qsv_cpu_platform {

plugins/obs-qsv11/QSV_Encoder_Internal.cpp

@@ -269,6 +269,8 @@ bool QSV_Encoder_Internal::InitParams(qsv_param_t *pParams)
 		if (pParams->nRateControl == MFX_RATECONTROL_LA_ICQ ||
 		    pParams->nRateControl == MFX_RATECONTROL_LA)
 			m_co2.LookAheadDepth = pParams->nLADEPTH;
+		if (pParams->bMBBRC)
+			m_co2.MBBRC = MFX_CODINGOPTION_ON;
 		if (pParams->nbFrames > 1)
 			m_co2.BRefType = MFX_B_REF_PYRAMID;
 		extendedBuffers[iBuffers++] = (mfxExtBuffer *)&m_co2;

plugins/obs-qsv11/obs-qsv11.c

@@ -159,6 +159,7 @@ static void obs_qsv_defaults(obs_data_t *settings)
 
 	obs_data_set_default_int(settings, "keyint_sec", 3);
 	obs_data_set_default_int(settings, "bframes", 3);
+	obs_data_set_default_bool(settings, "mbbrc", true);
 }
 
 static inline void add_strings(obs_property_t *list, const char *const *strings)
@@ -181,7 +182,13 @@ static inline void add_strings(obs_property_t *list, const char *const *strings)
 #define TEXT_LA_DEPTH obs_module_text("LookAheadDepth")
 #define TEXT_KEYINT_SEC obs_module_text("KeyframeIntervalSec")
 #define TEXT_BFRAMES obs_module_text("B Frames")
+#define TEXT_MBBRC obs_module_text("Content Adaptive Quantization")
 
+static inline bool is_skl_or_greater_platform()
+{
+	enum qsv_cpu_platform plat = qsv_get_cpu_platform();
+	return (plat >= QSV_CPU_PLATFORM_SKL);
+}
 static bool rate_control_modified(obs_properties_t *ppts, obs_property_t *p,
 				  obs_data_t *settings)
 {
@@ -223,6 +230,12 @@ static bool rate_control_modified(obs_properties_t *ppts, obs_property_t *p,
 	p = obs_properties_get(ppts, "la_depth");
 	obs_property_set_visible(p, bVisible);
 
+	bVisible = astrcmpi(rate_control, "CBR") == 0 ||
+		    astrcmpi(rate_control, "VBR") == 0 ||
+		    astrcmpi(rate_control, "AVBR") == 0;
+	p = obs_properties_get(ppts, "mbbrc");
+	obs_property_set_visible(p, bVisible);
+
 	return true;
 }
 
@@ -283,6 +296,9 @@ static obs_properties_t *obs_qsv_props(void *unused)
 	obs_properties_add_int(props, "la_depth", TEXT_LA_DEPTH, 10, 100, 1);
 	obs_properties_add_int(props, "bframes", TEXT_BFRAMES, 0, 3, 1);
 
+	if (is_skl_or_greater_platform())
+		obs_properties_add_bool(props, "mbbrc", TEXT_MBBRC);
+
 	return props;
 }
 
@@ -309,6 +325,7 @@ static void update_params(struct obs_qsv *obsqsv, obs_data_t *settings)
 	int keyint_sec = (int)obs_data_get_int(settings, "keyint_sec");
 	bool cbr_override = obs_data_get_bool(settings, "cbr");
 	int bFrames = (int)obs_data_get_int(settings, "bframes");
+	bool mbbrc = obs_data_get_bool(settings, "mbbrc");
 
 	if (obs_data_has_user_value(settings, "bf"))
 		bFrames = (int)obs_data_get_int(settings, "bf");
@@ -373,6 +390,7 @@ static void update_params(struct obs_qsv *obsqsv, obs_data_t *settings)
 	obsqsv->params.nbFrames = (mfxU16)bFrames;
 	obsqsv->params.nKeyIntSec = (mfxU16)keyint_sec;
 	obsqsv->params.nICQQuality = (mfxU16)icq_quality;
+	obsqsv->params.bMBBRC = mbbrc;
 
 	info("settings:\n\trate_control:   %s", rate_control);