[FFmpeg-devel,5/6] lavc: Add VP9 metadata bitstream filter

diff --git a/configure b/configure
index 57748e1424..7f199c634d 100755
--- a/configure
+++ b/configure
@@ -2989,6 +2989,7 @@  hevc_metadata_bsf_select="cbs_h265"
 mjpeg2jpeg_bsf_select="jpegtables"
 mpeg2_metadata_bsf_select="cbs_mpeg2"
 trace_headers_bsf_select="cbs"
+vp9_metadata_bsf_select="cbs_vp9"
 
 # external libraries
 aac_at_decoder_deps="audiotoolbox"
diff --git a/doc/bitstream_filters.texi b/doc/bitstream_filters.texi
index 7f98cb714f..7d7e97503a 100644
--- a/doc/bitstream_filters.texi
+++ b/doc/bitstream_filters.texi
@@ -507,6 +507,32 @@  This can be useful for debugging low-level stream issues.
 
 Supports H.264, H.265, MPEG-2 and VP9.
 
+@section vp9_metadata
+
+Modify metadata embedded in a VP9 stream.
+
+@table @option
+@item color_space
+Set the color space value in the frame header.
+@table @samp
+@item unknown
+@item bt601
+@item bt709
+@item smpte170
+@item smpte240
+@item bt2020
+@item rgb
+@end table
+
+@item color_range
+Set the color range value in the frame header.  Note that this cannot
+be set in RGB streams.
+@table @samp
+@item tv
+@item pc
+@end table
+@end table
+
 @section vp9_superframe
 
 Merge VP9 invisible (alt-ref) frames back into VP9 superframes. This
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 15e8c87385..663bdce4e4 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -1066,6 +1066,7 @@  OBJS-$(CONFIG_NULL_BSF)                   += null_bsf.o
 OBJS-$(CONFIG_REMOVE_EXTRADATA_BSF)       += remove_extradata_bsf.o
 OBJS-$(CONFIG_TEXT2MOVSUB_BSF)            += movsub_bsf.o
 OBJS-$(CONFIG_TRACE_HEADERS_BSF)          += trace_headers_bsf.o
+OBJS-$(CONFIG_VP9_METADATA_BSF)           += vp9_metadata_bsf.o
 OBJS-$(CONFIG_VP9_RAW_REORDER_BSF)        += vp9_raw_reorder_bsf.o
 OBJS-$(CONFIG_VP9_SUPERFRAME_BSF)         += vp9_superframe_bsf.o
 OBJS-$(CONFIG_VP9_SUPERFRAME_SPLIT_BSF)   += vp9_superframe_split_bsf.o
diff --git a/libavcodec/bitstream_filters.c b/libavcodec/bitstream_filters.c
index 18b698a85f..c21373621c 100644
--- a/libavcodec/bitstream_filters.c
+++ b/libavcodec/bitstream_filters.c
@@ -49,6 +49,7 @@  extern const AVBitStreamFilter ff_null_bsf;
 extern const AVBitStreamFilter ff_remove_extradata_bsf;
 extern const AVBitStreamFilter ff_text2movsub_bsf;
 extern const AVBitStreamFilter ff_trace_headers_bsf;
+extern const AVBitStreamFilter ff_vp9_metadata_bsf;
 extern const AVBitStreamFilter ff_vp9_raw_reorder_bsf;
 extern const AVBitStreamFilter ff_vp9_superframe_bsf;
 extern const AVBitStreamFilter ff_vp9_superframe_split_bsf;
diff --git a/libavcodec/vp9_metadata_bsf.c b/libavcodec/vp9_metadata_bsf.c
new file mode 100644
index 0000000000..be010edc3f
--- /dev/null
+++ b/libavcodec/vp9_metadata_bsf.c
@@ -0,0 +1,162 @@ 
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/avstring.h"
+#include "libavutil/common.h"
+#include "libavutil/opt.h"
+
+#include "bsf.h"
+#include "cbs.h"
+#include "cbs_vp9.h"
+
+typedef struct VP9MetadataContext {
+    const AVClass *class;
+
+    CodedBitstreamContext *cbc;
+    CodedBitstreamFragment fragment;
+
+    int color_space;
+    int color_range;
+
+    int color_range_rgb_warned;
+} VP9MetadataContext;
+
+
+static int vp9_metadata_filter(AVBSFContext *bsf, AVPacket *out)
+{
+    VP9MetadataContext *ctx = bsf->priv_data;
+    AVPacket *in = NULL;
+    CodedBitstreamFragment *frag = &ctx->fragment;
+    int err, i;
+
+    err = ff_bsf_get_packet(bsf, &in);
+    if (err < 0)
+        return err;
+
+    err = ff_cbs_read_packet(ctx->cbc, frag, in);
+    if (err < 0) {
+        av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n");
+        goto fail;
+    }
+
+    for (i = 0; i < frag->nb_units; i++) {
+        VP9RawFrame *frame = frag->units[i].content;
+        VP9RawFrameHeader *header = &frame->header;
+
+        if (ctx->color_space >= 0) {
+            header->color_space = ctx->color_space;
+        }
+        if (ctx->color_range >= 0) {
+            if (ctx->color_range == 0 &&
+                header->color_space == VP9_CS_RGB &&
+                !ctx->color_range_rgb_warned) {
+                av_log(bsf, AV_LOG_WARNING, "Warning: color_range cannot "
+                       "be set to limited in RGB streams.\n");
+                ctx->color_range_rgb_warned = 1;
+            } else {
+                header->color_range = ctx->color_range;
+            }
+        }
+    }
+
+    err = ff_cbs_write_packet(ctx->cbc, out, frag);
+    if (err < 0) {
+        av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n");
+        goto fail;
+    }
+
+    err = av_packet_copy_props(out, in);
+    if (err < 0)
+        goto fail;
+
+    err = 0;
+fail:
+    ff_cbs_fragment_uninit(ctx->cbc, frag);
+
+    if (err < 0)
+        av_packet_unref(out);
+    av_packet_free(&in);
+
+    return err;
+}
+
+static int vp9_metadata_init(AVBSFContext *bsf)
+{
+    VP9MetadataContext *ctx = bsf->priv_data;
+
+    return ff_cbs_init(&ctx->cbc, AV_CODEC_ID_VP9, bsf);
+}
+
+static void vp9_metadata_close(AVBSFContext *bsf)
+{
+    VP9MetadataContext *ctx = bsf->priv_data;
+    ff_cbs_close(&ctx->cbc);
+}
+
+#define OFFSET(x) offsetof(VP9MetadataContext, x)
+#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
+static const AVOption vp9_metadata_options[] = {
+    { "color_space", "Set colour space (section 7.2.2)",
+        OFFSET(color_space), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, VP9_CS_RGB, FLAGS, "cs" },
+    { "unknown",  "Unknown/unspecified",  0, AV_OPT_TYPE_CONST,
+        { .i64 = VP9_CS_UNKNOWN   }, .flags = FLAGS, .unit = "cs" },
+    { "bt601",    "ITU-R BT.601-7",       0, AV_OPT_TYPE_CONST,
+        { .i64 = VP9_CS_BT_601    }, .flags = FLAGS, .unit = "cs" },
+    { "bt709",    "ITU-R BT.709-6",       0, AV_OPT_TYPE_CONST,
+        { .i64 = VP9_CS_BT_709    }, .flags = FLAGS, .unit = "cs" },
+    { "smpte170", "SMPTE-170",            0, AV_OPT_TYPE_CONST,
+        { .i64 = VP9_CS_SMPTE_170 }, .flags = FLAGS, .unit = "cs" },
+    { "smpte240", "SMPTE-240",            0, AV_OPT_TYPE_CONST,
+        { .i64 = VP9_CS_SMPTE_240 }, .flags = FLAGS, .unit = "cs" },
+    { "bt2020",   "ITU-R BT.2020-2",      0, AV_OPT_TYPE_CONST,
+        { .i64 = VP9_CS_BT_2020   }, .flags = FLAGS, .unit = "cs" },
+    { "rgb",      "sRGB / IEC 61966-2-1", 0, AV_OPT_TYPE_CONST,
+        { .i64 = VP9_CS_RGB       }, .flags = FLAGS, .unit = "cs" },
+
+    { "color_range", "Set colour range (section 7.2.2)",
+        OFFSET(color_range), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 1, FLAGS, "cr" },
+    { "tv", "TV (limited) range", 0, AV_OPT_TYPE_CONST,
+        { .i64 = 0 }, .flags = FLAGS, .unit = "cr" },
+    { "pc", "PC (full) range",    0, AV_OPT_TYPE_CONST,
+        { .i64 = 1 }, .flags = FLAGS, .unit = "cr" },
+
+    { NULL }
+};
+
+static const AVClass vp9_metadata_class = {
+    .class_name = "vp9_metadata_bsf",
+    .item_name  = av_default_item_name,
+    .option     = vp9_metadata_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+static const enum AVCodecID vp9_metadata_codec_ids[] = {
+    AV_CODEC_ID_VP9, AV_CODEC_ID_NONE,
+};
+
+const AVBitStreamFilter ff_vp9_metadata_bsf = {
+    .name           = "vp9_metadata",
+    .priv_data_size = sizeof(VP9MetadataContext),
+    .priv_class     = &vp9_metadata_class,
+    .init           = &vp9_metadata_init,
+    .close          = &vp9_metadata_close,
+    .filter         = &vp9_metadata_filter,
+    .codec_ids      = vp9_metadata_codec_ids,
+};