[FFmpeg-devel] [PATCH v3] lavc/vaapi_encode: Enable block level bitrate control

[fei.w.wang at intel.com]

From: Fei Wang <fei.w.wang at intel.com>

Signed-off-by: Fei Wang <fei.w.wang at intel.com>
---
 doc/encoders.texi         |  4 ++++
 libavcodec/vaapi_encode.c | 13 ++++++++++++-
 libavcodec/vaapi_encode.h |  9 ++++++++-
 3 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index 5f7864770e..7c223ed74c 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -4089,6 +4089,10 @@ Quality-defined variable-bitrate.
 Average variable bitrate.
 @end table
 
+ at item blbrc
+Enable block level rate control, which assigns different bitrate block by block.
+Invalid for CQP mode.
+
 @end table
 
 Each encoder also has its own specific options:
diff --git a/libavcodec/vaapi_encode.c b/libavcodec/vaapi_encode.c
index 808b79c0c7..940f0678a5 100644
--- a/libavcodec/vaapi_encode.c
+++ b/libavcodec/vaapi_encode.c
@@ -1805,6 +1805,11 @@ static av_cold int vaapi_encode_init_rate_control(AVCodecContext *avctx)
         int i, first = 1, res;
 
         supported_va_rc_modes = rc_attr.value;
+        if (ctx->blbrc && !(supported_va_rc_modes & VA_RC_MB)) {
+            ctx->blbrc = 0;
+            av_log(avctx, AV_LOG_WARNING, "Driver does not support BLBRC.\n");
+        }
+
         for (i = 0; i < FF_ARRAY_ELEMS(vaapi_encode_rc_modes); i++) {
             rc_mode = &vaapi_encode_rc_modes[i];
             if (supported_va_rc_modes & rc_mode->va_mode) {
@@ -2016,13 +2021,18 @@ rc_mode_found:
     ctx->va_bit_rate = rc_bits_per_second;
 
     av_log(avctx, AV_LOG_VERBOSE, "RC mode: %s.\n", rc_mode->name);
+
+    if (ctx->blbrc && ctx->va_rc_mode == VA_RC_CQP)
+        ctx->blbrc = 0;
+    av_log(avctx, AV_LOG_VERBOSE, "Block Level bitrate control: %s.\n", ctx->blbrc ? "ON" : "OFF");
+
     if (rc_attr.value == VA_ATTRIB_NOT_SUPPORTED) {
         // This driver does not want the RC mode attribute to be set.
     } else {
         ctx->config_attributes[ctx->nb_config_attributes++] =
             (VAConfigAttrib) {
             .type  = VAConfigAttribRateControl,
-            .value = ctx->va_rc_mode,
+            .value = ctx->blbrc ? ctx->va_rc_mode | VA_RC_MB : ctx->va_rc_mode,
         };
     }
 
@@ -2051,6 +2061,7 @@ rc_mode_found:
 #if VA_CHECK_VERSION(1, 1, 0)
             .ICQ_quality_factor = av_clip(rc_quality, 1, 51),
             .max_qp             = (avctx->qmax > 0 ? avctx->qmax : 0),
+            .rc_flags.bits.mb_rate_control = ctx->blbrc ? 1 : 2,
 #endif
 #if VA_CHECK_VERSION(1, 3, 0)
             .quality_factor     = rc_quality,
diff --git a/libavcodec/vaapi_encode.h b/libavcodec/vaapi_encode.h
index 6964055b93..0eed9691ca 100644
--- a/libavcodec/vaapi_encode.h
+++ b/libavcodec/vaapi_encode.h
@@ -216,6 +216,9 @@ typedef struct VAAPIEncodeContext {
     // available modes).
     int             explicit_rc_mode;
 
+    // Block Level based bitrate control.
+    int             blbrc;
+
     // Explicitly-set QP, for use with the "qp" options.
     // (Forces CQP mode when set, overriding everything else.)
     int             explicit_qp;
@@ -538,7 +541,11 @@ int ff_vaapi_encode_close(AVCodecContext *avctx);
     VAAPI_ENCODE_RC_MODE(VBR,  "Variable-bitrate"), \
     VAAPI_ENCODE_RC_MODE(ICQ,  "Intelligent constant-quality"), \
     VAAPI_ENCODE_RC_MODE(QVBR, "Quality-defined variable-bitrate"), \
-    VAAPI_ENCODE_RC_MODE(AVBR, "Average variable-bitrate")
+    VAAPI_ENCODE_RC_MODE(AVBR, "Average variable-bitrate"), \
+    { "blbrc", \
+      "Block level based bitrate control",\
+      OFFSET(common.blbrc), AV_OPT_TYPE_BOOL, \
+      { .i64 = 0 }, 0, 1, FLAGS }
 
 
 #endif /* AVCODEC_VAAPI_ENCODE_H */
-- 
2.25.1