[FFmpeg-devel] [PATCH 2/5] avcodec/amfenc: Set all color metadata for AMF

[Michael Fabian 'Xaymar' Dirks <michael.dirks@xaymar.com>]

Fixes the color information in the output from the AMD encoder being wrong, which led to weird transcoding results. This problem appeared out of thin air, and I've been unable to tie it to a specific driver that supports my hardware. Unfortunately this requires AMF SDK version 1.4.23 or later, but it should still work fine on older drivers.

Theoretical support for HDR encoding is also now possible, although the implementation is not complete. I have no clear idea on how to generate AMFs HDR metadata structure, or where to even take this information from.
---
 libavcodec/amfenc.h      |  1 +
 libavcodec/amfenc_h264.c | 48 +++++++++++++++++++++++++++++++++++++-
 libavcodec/amfenc_hevc.c | 50 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 98 insertions(+), 1 deletion(-)

diff --git a/libavcodec/amfenc.h b/libavcodec/amfenc.h
index 358b2ef778..951e529362 100644
--- a/libavcodec/amfenc.h
+++ b/libavcodec/amfenc.h
@@ -21,6 +21,7 @@
 
 #include <AMF/core/Factory.h>
 
+#include <AMF/components/ColorSpace.h>
 #include <AMF/components/VideoEncoderVCE.h>
 #include <AMF/components/VideoEncoderHEVC.h>
 
diff --git a/libavcodec/amfenc_h264.c b/libavcodec/amfenc_h264.c
index aeca99f7c6..009378e9f1 100644
--- a/libavcodec/amfenc_h264.c
+++ b/libavcodec/amfenc_h264.c
@@ -137,6 +137,8 @@ static av_cold int amf_encode_init_h264(AVCodecContext *avctx)
     AMFRate                          framerate;
     AMFSize                          framesize = AMFConstructSize(avctx->width, avctx->height);
     int                              deblocking_filter = (avctx->flags & AV_CODEC_FLAG_LOOP_FILTER) ? 1 : 0;
+    amf_int64                        color_depth;
+    amf_int64                        color_profile;
 
     if (avctx->framerate.num > 0 && avctx->framerate.den > 0) {
         framerate = AMFConstructRate(avctx->framerate.num, avctx->framerate.den);
@@ -194,10 +196,54 @@ static av_cold int amf_encode_init_h264(AVCodecContext *avctx)
         AMF_ASSIGN_PROPERTY_RATIO(res, ctx->encoder, AMF_VIDEO_ENCODER_ASPECT_RATIO, ratio);
     }
 
-    /// Color Range (Partial/TV/MPEG or Full/PC/JPEG)
+    // Color Metadata
+    /// Color Range (Support for older Drivers)
     if (avctx->color_range == AVCOL_RANGE_JPEG) {
         AMF_ASSIGN_PROPERTY_BOOL(res, ctx->encoder, AMF_VIDEO_ENCODER_FULL_RANGE_COLOR, 1);
+    } else {
+        AMF_ASSIGN_PROPERTY_BOOL(res, ctx->encoder, AMF_VIDEO_ENCODER_FULL_RANGE_COLOR, 0);
+    }
+    /// Color Space & Depth
+    color_depth = AMF_COLOR_BIT_DEPTH_8;
+    color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_UNKNOWN;
+    switch (avctx->colorspace) {
+    case AVCOL_SPC_SMPTE170M:
+        if (avctx->color_range == AVCOL_RANGE_JPEG) {
+            color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_FULL_601;
+        } else {
+            color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_601;
+        }
+        break;
+    case AVCOL_SPC_BT709:
+        if (avctx->color_range == AVCOL_RANGE_JPEG) {
+            color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_FULL_709;
+        } else {
+            color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_709;
+        }
+        break;
+    case AVCOL_SPC_BT2020_NCL:
+    case AVCOL_SPC_BT2020_CL:
+        // !FIXME: Verify that this is correct on Hardware supporting it.
+        // !FIXME: Figure out how to decide on bit depth.
+        if (avctx->color_range == AVCOL_RANGE_JPEG) {
+            color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_FULL_2020;
+            color_depth = AMF_COLOR_BIT_DEPTH_10;
+        } else {
+            color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_2020;
+            color_depth = AMF_COLOR_BIT_DEPTH_10;
+        }
+        break;
     }
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_COLOR_BIT_DEPTH, color_depth);
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_INPUT_COLOR_PROFILE, color_profile);
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_OUTPUT_COLOR_PROFILE, color_profile);
+    /// Color Transfer Characteristics (AMF matches ISO/IEC)
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_INPUT_TRANSFER_CHARACTERISTIC, (amf_int64)avctx->color_trc);
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_OUTPUT_TRANSFER_CHARACTERISTIC, (amf_int64)avctx->color_trc);
+    /// Color Primaries (AMF matches ISO/IEC)
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_INPUT_COLOR_PRIMARIES, (amf_int64)avctx->color_primaries);
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_OUTPUT_COLOR_PRIMARIES, (amf_int64)avctx->color_primaries);
+    /// !TODO: AMF HDR Metadata generation
 
     // autodetect rate control method
     if (ctx->rate_control_mode == AMF_VIDEO_ENCODER_RATE_CONTROL_METHOD_UNKNOWN) {
diff --git a/libavcodec/amfenc_hevc.c b/libavcodec/amfenc_hevc.c
index 79541b9b2f..900e1482b4 100644
--- a/libavcodec/amfenc_hevc.c
+++ b/libavcodec/amfenc_hevc.c
@@ -104,6 +104,8 @@ static av_cold int amf_encode_init_hevc(AVCodecContext *avctx)
     AMFRate             framerate;
     AMFSize             framesize = AMFConstructSize(avctx->width, avctx->height);
     int                 deblocking_filter = (avctx->flags & AV_CODEC_FLAG_LOOP_FILTER) ? 1 : 0;
+    amf_int64           color_depth;
+    amf_int64           color_profile;
 
     if (avctx->framerate.num > 0 && avctx->framerate.den > 0) {
         framerate = AMFConstructRate(avctx->framerate.num, avctx->framerate.den);
@@ -152,6 +154,54 @@ static av_cold int amf_encode_init_hevc(AVCodecContext *avctx)
         AMFRatio ratio = AMFConstructRatio(avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den);
         AMF_ASSIGN_PROPERTY_RATIO(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_ASPECT_RATIO, ratio);
     }
+    
+    // Color Metadata
+    /// Color Range (Support for older Drivers)
+    if (avctx->color_range == AVCOL_RANGE_JPEG) {
+        AMF_ASSIGN_PROPERTY_BOOL(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_NOMINAL_RANGE, 1);
+    } else {
+        AMF_ASSIGN_PROPERTY_BOOL(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_NOMINAL_RANGE, 0);
+    }
+    /// Color Space & Depth
+    color_depth = AMF_COLOR_BIT_DEPTH_8;
+    color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_UNKNOWN;
+    switch (avctx->colorspace) {
+    case AVCOL_SPC_SMPTE170M:
+        if (avctx->color_range == AVCOL_RANGE_JPEG) {
+            color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_FULL_601;
+        } else {
+            color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_601;
+        }
+        break;
+    case AVCOL_SPC_BT709:
+        if (avctx->color_range == AVCOL_RANGE_JPEG) {
+            color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_FULL_709;
+        } else {
+            color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_709;
+        }
+        break;
+    case AVCOL_SPC_BT2020_NCL:
+    case AVCOL_SPC_BT2020_CL:
+        // !FIXME: Verify that this is correct on Hardware supporting it.
+        // !FIXME: Figure out how to decide on bit depth.
+        if (avctx->color_range == AVCOL_RANGE_JPEG) {
+            color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_FULL_2020;
+            color_depth = AMF_COLOR_BIT_DEPTH_10;
+        } else {
+            color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_2020;
+            color_depth = AMF_COLOR_BIT_DEPTH_10;
+        }
+        break;
+    }
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_COLOR_BIT_DEPTH, color_depth);
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_INPUT_COLOR_PROFILE, color_profile);
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_OUTPUT_COLOR_PROFILE, color_profile);
+    /// Color Transfer Characteristics (AMF matches ISO/IEC)
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_INPUT_TRANSFER_CHARACTERISTIC, (amf_int64)avctx->color_trc);
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_OUTPUT_TRANSFER_CHARACTERISTIC, (amf_int64)avctx->color_trc);
+    /// Color Primaries (AMF matches ISO/IEC)
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_INPUT_COLOR_PRIMARIES, (amf_int64)avctx->color_primaries);
+    AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_OUTPUT_COLOR_PRIMARIES, (amf_int64)avctx->color_primaries);
 
     // Picture control properties
     AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_NUM_GOPS_PER_IDR, ctx->gops_per_idr);
-- 
2.34.1.windows.1

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