1 files changed, 103 insertions, 0 deletions
diff --git a/libavformat/vpcc.c b/libavformat/vpcc.c
new file mode 100644
index 0000000..df08de5
--- /dev/null
+++ b/libavformat/vpcc.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2016 Google Inc.
+ * Copyright (c) 2016 KongQun Yang (kqyang@google.com)
+ *
+ * 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/pixdesc.h"
+#include "libavutil/pixfmt.h"
+#include "vpcc.h"
+
+enum VPX_CHROMA_SUBSAMPLING
+{
+    VPX_SUBSAMPLING_420_VERTICAL = 0,
+    VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA = 1,
+    VPX_SUBSAMPLING_422 = 2,
+    VPX_SUBSAMPLING_444 = 3,
+};
+
+static int get_vpx_chroma_subsampling(AVFormatContext *s,
+                                      enum AVPixelFormat pixel_format,
+                                      enum AVChromaLocation chroma_location)
+{
+    int chroma_w, chroma_h;
+    if (av_pix_fmt_get_chroma_sub_sample(pixel_format, &chroma_w, &chroma_h) == 0) {
+        if (chroma_w == 1 && chroma_h == 1) {
+            return (chroma_location == AVCHROMA_LOC_LEFT)
+                       ? VPX_SUBSAMPLING_420_VERTICAL
+                       : VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA;
+        } else if (chroma_w == 1 && chroma_h == 0) {
+            return VPX_SUBSAMPLING_422;
+        } else if (chroma_w == 0 && chroma_h == 0) {
+            return VPX_SUBSAMPLING_444;
+        }
+    }
+    av_log(s, AV_LOG_ERROR, "Unsupported pixel format (%d)\n", pixel_format);
+    return -1;
+}
+
+static int get_bit_depth(AVFormatContext *s, enum AVPixelFormat pixel_format)
+{
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pixel_format);
+    if (desc == NULL) {
+        av_log(s, AV_LOG_ERROR, "Unsupported pixel format (%d)\n",
+               pixel_format);
+        return -1;
+    }
+    return desc->comp[0].depth;
+}
+
+static int get_vpx_video_full_range_flag(enum AVColorRange color_range)
+{
+    return color_range == AVCOL_RANGE_JPEG;
+}
+
+int ff_isom_write_vpcc(AVFormatContext *s, AVIOContext *pb,
+                       AVCodecParameters *par)
+{
+    int profile = par->profile;
+    int level = par->level == FF_LEVEL_UNKNOWN ? 0 : par->level;
+    int bit_depth = get_bit_depth(s, par->format);
+    int vpx_chroma_subsampling =
+        get_vpx_chroma_subsampling(s, par->format, par->chroma_location);
+    int vpx_video_full_range_flag =
+        get_vpx_video_full_range_flag(par->color_range);
+
+    if (bit_depth < 0 || vpx_chroma_subsampling < 0)
+        return AVERROR_INVALIDDATA;
+
+    if (profile == FF_PROFILE_UNKNOWN) {
+        if (vpx_chroma_subsampling == VPX_SUBSAMPLING_420_VERTICAL ||
+            vpx_chroma_subsampling == VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA) {
+            profile = (bit_depth == 8) ? FF_PROFILE_VP9_0 : FF_PROFILE_VP9_2;
+        } else {
+            profile = (bit_depth == 8) ? FF_PROFILE_VP9_1 : FF_PROFILE_VP9_3;
+        }
+    }
+
+    avio_w8(pb, profile);
+    avio_w8(pb, level);
+    avio_w8(pb, (bit_depth << 4) | (vpx_chroma_subsampling << 1) | vpx_video_full_range_flag);
+    avio_w8(pb, par->color_primaries);
+    avio_w8(pb, par->color_trc);
+    avio_w8(pb, par->color_space);
+
+    // vp9 does not have codec initialization data.
+    avio_wb16(pb, 0);
+    return 0;
+}