[FFmpeg-devel] [PATCH] avutil/hwcontext_videotoolbox: Allocate attachments dictionary

[gnattu via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

From: Gnattu OC <gnattuoc@me.com>

Allocate a dedicated attachments dictionary instead of trying to get
one from the pixel buffer. The attachments got from the pixel buffer
confuses the CVImageBufferCreateColorSpaceFromAttachments method and
will make it to output a wrong colorspace that causes problem like
#10884.

Signed-off-by: gnattu <gnattuoc@me.com>
---
 libavutil/hwcontext_videotoolbox.c | 35 ++++++++++++++++++------------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/libavutil/hwcontext_videotoolbox.c b/libavutil/hwcontext_videotoolbox.c
index 1794459943..dda6ada1af 100644
--- a/libavutil/hwcontext_videotoolbox.c
+++ b/libavutil/hwcontext_videotoolbox.c
@@ -569,11 +569,19 @@ static int vt_pixbuf_set_colorspace(void *log_ctx,
     CGColorSpaceRef colorspace = NULL;
     CFStringRef colormatrix = NULL, colorpri = NULL, colortrc = NULL;
     Float32 gamma = 0;
+    CFMutableDictionaryRef attachments = NULL;
+    attachments = CFDictionaryCreateMutable(NULL, 0,
+                                            &kCFTypeDictionaryKeyCallBacks,
+                                            &kCFTypeDictionaryValueCallBacks);
+    if (!attachments)
+        return AVERROR(ENOMEM);
 
     colormatrix = av_map_videotoolbox_color_matrix_from_av(src->colorspace);
-    if (colormatrix)
+    if (colormatrix) {
+        CFDictionarySetValue(attachments, kCVImageBufferYCbCrMatrixKey, colormatrix);
         CVBufferSetAttachment(pixbuf, kCVImageBufferYCbCrMatrixKey,
-            colormatrix, kCVAttachmentMode_ShouldPropagate);
+                              colormatrix, kCVAttachmentMode_ShouldPropagate);
+    }
     else {
         CVBufferRemoveAttachment(pixbuf, kCVImageBufferYCbCrMatrixKey);
         if (src->colorspace != AVCOL_SPC_UNSPECIFIED)
@@ -583,9 +591,11 @@ static int vt_pixbuf_set_colorspace(void *log_ctx,
     }
 
     colorpri = av_map_videotoolbox_color_primaries_from_av(src->color_primaries);
-    if (colorpri)
+    if (colorpri) {
+        CFDictionarySetValue(attachments, kCVImageBufferColorPrimariesKey, colorpri);
         CVBufferSetAttachment(pixbuf, kCVImageBufferColorPrimariesKey,
-            colorpri, kCVAttachmentMode_ShouldPropagate);
+                              colorpri, kCVAttachmentMode_ShouldPropagate);
+    }
     else {
         CVBufferRemoveAttachment(pixbuf, kCVImageBufferColorPrimariesKey);
         if (src->color_primaries != AVCOL_SPC_UNSPECIFIED)
@@ -595,9 +605,11 @@ static int vt_pixbuf_set_colorspace(void *log_ctx,
     }
 
     colortrc = av_map_videotoolbox_color_trc_from_av(src->color_trc);
-    if (colortrc)
+    if (colortrc) {
+        CFDictionarySetValue(attachments, kCVImageBufferTransferFunctionKey, colortrc);
         CVBufferSetAttachment(pixbuf, kCVImageBufferTransferFunctionKey,
-            colorpri, kCVAttachmentMode_ShouldPropagate);
+                              colorpri, kCVAttachmentMode_ShouldPropagate);
+    }
     else {
         CVBufferRemoveAttachment(pixbuf, kCVImageBufferTransferFunctionKey);
         if (src->color_trc != AVCOL_TRC_UNSPECIFIED)
@@ -622,17 +634,12 @@ static int vt_pixbuf_set_colorspace(void *log_ctx,
 #if (TARGET_OS_OSX && __MAC_OS_X_VERSION_MAX_ALLOWED >= 100800) || \
     (TARGET_OS_IOS && __IPHONE_OS_VERSION_MAX_ALLOWED >= 100000)
     if (__builtin_available(macOS 10.8, iOS 10, *)) {
-        CFDictionaryRef attachments =
-            vt_cv_buffer_copy_attachments(pixbuf, kCVAttachmentMode_ShouldPropagate);
-
-        if (attachments) {
-            colorspace =
-                CVImageBufferCreateColorSpaceFromAttachments(attachments);
-            CFRelease(attachments);
-        }
+        colorspace = CVImageBufferCreateColorSpaceFromAttachments(attachments);
     }
 #endif
 
+    CFRelease(attachments);
+
     // Done outside the above preprocessor code and if's so that
     // in any case a wrong kCVImageBufferCGColorSpaceKey is removed
     // if the above code is not used or fails.
-- 
2.39.3 (Apple Git-146)

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