[PATCH 2/2] winegstreamer: Pass H264 codec data as streamheader if it's not parsed yet.

[Rémi Bernon]

From: Rémi Bernon

And set stream-format to avc if it is, as h264parse doesn't expect a
codec_data otherwise.

Native demuxers and decoders expect the H264 codec data to be appended
SPS/PPS NALs, but Wine sometimes only gets it in parsed format if it's
stored like that in an avcC MP4 atom.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57204
---
 dlls/winegstreamer/wg_media_type.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/dlls/winegstreamer/wg_media_type.c b/dlls/winegstreamer/wg_media_type.c
index f2d6e273df2..581e09bbfa0 100644
--- a/dlls/winegstreamer/wg_media_type.c
+++ b/dlls/winegstreamer/wg_media_type.c
@@ -288,13 +288,33 @@ static void init_caps_from_video_cinepak(GstCaps *caps, const MFVIDEOFORMAT *for
     gst_structure_set_name(gst_caps_get_structure(caps, 0), "video/x-cinepak");
 }

+static int is_h264_start_code(UINT32 value)
+{
+    return value == 0x10000000 || (value << 8) == 0x10000000;
+}
+
 static void init_caps_from_video_h264(GstCaps *caps, const MFVIDEOFORMAT *format, UINT format_size)
 {
-    init_caps_codec_data(caps, format + 1, format_size - sizeof(*format));
+    GstBuffer *buffer;

gst_structure_remove_field(gst_caps_get_structure(caps, 0), "format");
     gst_structure_set_name(gst_caps_get_structure(caps, 0), "video/x-h264");
-    gst_caps_set_simple(caps, "stream-format", G_TYPE_STRING, "byte-stream", NULL);
+    if (format_size <= sizeof(*format) || !(buffer = gst_buffer_new_and_alloc(format_size - sizeof(*format))))
+        gst_caps_set_simple(caps, "stream-format", G_TYPE_STRING, "byte-stream", NULL);
+    else if (format_size - sizeof(*format) >= 4 && is_h264_start_code( *(UINT32 *)(format + 1) ))
+    {
+        gst_buffer_fill(buffer, 0, format + 1, format_size - sizeof(*format));
+        gst_caps_set_simple(caps, "streamheader", GST_TYPE_BUFFER, buffer, NULL);
+        gst_caps_set_simple(caps, "stream-format", G_TYPE_STRING, "byte-stream", NULL);
+        gst_buffer_unref(buffer);
+    }
+    else
+    {
+        gst_buffer_fill(buffer, 0, format + 1, format_size - sizeof(*format));
+        gst_caps_set_simple(caps, "codec_data", GST_TYPE_BUFFER, buffer, NULL);
+        gst_caps_set_simple(caps, "stream-format", G_TYPE_STRING, "avc", NULL);
+        gst_buffer_unref(buffer);
+    }
 }

static void init_caps_from_video_wmv(GstCaps *caps, const MFVIDEOFORMAT *format, UINT format_size,