libopenh264enc: export CPB props side data

libavcodec/internal.h

@@ -240,4 +240,9 @@ int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt);
  */
 int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame);
 
+/**
+ * Add a CPB properties side data to an encoding context.
+ */
+AVCPBProperties *ff_add_cpb_side_data(AVCodecContext *avctx);
+
 #endif /* AVCODEC_INTERNAL_H */

libavcodec/libopenh264enc.c

@@ -108,6 +108,7 @@ static av_cold int svc_encode_init(AVCodecContext *avctx)
     int err = AVERROR_UNKNOWN;
     int log_level;
     WelsTraceCallback callback_function;
+    AVCPBProperties *props;
 
     // Mingw GCC < 4.7 on x86_32 uses an incorrect/buggy ABI for the WelsGetCodecVersion
     // function (for functions returning larger structs), thus skip the check in those
@@ -223,6 +224,14 @@ static av_cold int svc_encode_init(AVCodecContext *avctx)
         memcpy(avctx->extradata, fbi.sLayerInfo[0].pBsBuf, size);
     }
 
+    props = ff_add_cpb_side_data(avctx);
+    if (!props) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+    props->max_bitrate = param.iMaxBitrate;
+    props->avg_bitrate = param.iTargetBitrate;
+
     return 0;
 
 fail:

libavcodec/utils.c

@@ -2383,3 +2383,29 @@ AVCPBProperties *av_cpb_properties_alloc(size_t *size)
 
     return props;
 }
+
+AVCPBProperties *ff_add_cpb_side_data(AVCodecContext *avctx)
+{
+    AVPacketSideData *tmp;
+    AVCPBProperties  *props;
+    size_t size;
+
+    props = av_cpb_properties_alloc(&size);
+    if (!props)
+        return NULL;
+
+    tmp = av_realloc_array(avctx->coded_side_data, avctx->nb_coded_side_data + 1, sizeof(*tmp));
+    if (!tmp) {
+        av_freep(&props);
+        return NULL;
+    }
+
+    avctx->coded_side_data = tmp;
+    avctx->nb_coded_side_data++;
+
+    avctx->coded_side_data[avctx->nb_coded_side_data - 1].type = AV_PKT_DATA_CPB_PROPERTIES;
+    avctx->coded_side_data[avctx->nb_coded_side_data - 1].data = (uint8_t*)props;
+    avctx->coded_side_data[avctx->nb_coded_side_data - 1].size = size;
+
+    return props;
+}