Make Futatabi fades apply white balance.

[nageru] / futatabi / video_stream.cpp

diff --git a/futatabi/video_stream.cpp b/futatabi/video_stream.cpp
index 3cd56a022401ac8cec245d8ac29f36ebb35c1894..d7d9fd04bcc97b0a8f3a56dbb467daf70996f49c 100644 (file)
--- a/futatabi/video_stream.cpp
+++ b/futatabi/video_stream.cpp
@@ -6,6 +6,7 @@ extern "C" {
 }
 
 #include "chroma_subsampler.h"
+#include "exif_parser.h"
 #include "flags.h"
 #include "flow.h"
 #include "jpeg_frame_view.h"
@@ -22,6 +23,7 @@ extern "C" {
 #include <jpeglib.h>
 #include <unistd.h>
 
+using namespace movit;
 using namespace std;
 using namespace std::chrono;
 
@@ -79,7 +81,7 @@ struct VectorDestinationManager {
 };
 static_assert(std::is_standard_layout<VectorDestinationManager>::value, "");
 
-string encode_jpeg(const uint8_t *y_data, const uint8_t *cb_data, const uint8_t *cr_data, unsigned width, unsigned height)
+string encode_jpeg(const uint8_t *y_data, const uint8_t *cb_data, const uint8_t *cr_data, unsigned width, unsigned height, const string exif_data)
 {
        VectorDestinationManager dest;
 
@@ -112,6 +114,10 @@ string encode_jpeg(const uint8_t *y_data, const uint8_t *cb_data, const uint8_t
        // (and nothing else).
        jpeg_write_marker(&cinfo, JPEG_COM, (const JOCTET *)"CS=ITU601", strlen("CS=ITU601"));
 
+       if (!exif_data.empty()) {
+               jpeg_write_marker(&cinfo, JPEG_APP0 + 1, (const JOCTET *)exif_data.data(), exif_data.size());
+       }
+
        JSAMPROW yptr[8], cbptr[8], crptr[8];
        JSAMPARRAY data[3] = { yptr, cbptr, crptr };
        for (unsigned y = 0; y < height; y += 8) {
@@ -234,7 +240,7 @@ VideoStream::VideoStream(AVFormatContext *file_avctx)
        unique_ptr<uint8_t[]> cb_or_cr(new uint8_t[(global_flags.width / 2) * global_flags.height]);
        memset(y.get(), 16, global_flags.width * global_flags.height);
        memset(cb_or_cr.get(), 128, (global_flags.width / 2) * global_flags.height);
-       last_frame = encode_jpeg(y.get(), cb_or_cr.get(), cb_or_cr.get(), global_flags.width, global_flags.height);
+       last_frame = encode_jpeg(y.get(), cb_or_cr.get(), cb_or_cr.get(), global_flags.width, global_flags.height, /*exif_data=*/"");
 
        if (file_avctx != nullptr) {
                with_subtitles = Mux::WITHOUT_SUBTITLES;
@@ -481,6 +487,9 @@ void VideoStream::schedule_interpolated_frame(steady_clock::time_point local_pts
                bool did_decode;
                shared_ptr<Frame> frame = decode_jpeg_with_cache(frame_spec, DECODE_IF_NOT_IN_CACHE, &frame_reader, &did_decode);
                ycbcr_converter->prepare_chain_for_conversion(frame)->render_to_fbo(resources->input_fbos[frame_no], global_flags.width, global_flags.height);
+               if (frame_no == 1) {
+                       qf.exif_data = frame->exif_data;  // Use the white point from the last frame.
+               }
        }
 
        glGenerateTextureMipmap(resources->input_tex);
@@ -519,12 +528,16 @@ void VideoStream::schedule_interpolated_frame(steady_clock::time_point local_pts
                shared_ptr<Frame> frame2 = decode_jpeg_with_cache(secondary_frame, DECODE_IF_NOT_IN_CACHE, &frame_reader, &did_decode);
 
                // Then fade against it, putting it into the fade Y' and CbCr textures.
-               ycbcr_semiplanar_converter->prepare_chain_for_fade_from_texture(qf.output_tex, global_flags.width, global_flags.height, frame2, fade_alpha)->render_to_fbo(resources->fade_fbo, global_flags.width, global_flags.height);
+               RGBTriplet neutral_color = get_neutral_color(qf.exif_data);
+               ycbcr_semiplanar_converter->prepare_chain_for_fade_from_texture(qf.output_tex, neutral_color, global_flags.width, global_flags.height, frame2, fade_alpha)->render_to_fbo(resources->fade_fbo, global_flags.width, global_flags.height);
 
                // Subsample and split Cb/Cr.
                chroma_subsampler->subsample_chroma(resources->fade_cbcr_output_tex, global_flags.width, global_flags.height, resources->cb_tex, resources->cr_tex);
 
                interpolate_no_split->release_texture(qf.output_tex);
+
+               // We already applied the white balance, so don't have the client redo it.
+               qf.exif_data.clear();
        } else {
                tie(qf.output_tex, qf.cbcr_tex) = interpolate->exec(resources->input_tex, resources->gray_tex, flow_tex, global_flags.width, global_flags.height, alpha);
                check_error();
@@ -703,9 +716,10 @@ void VideoStream::encode_thread_func()
                        glClientWaitSync(qf.fence.get(), /*flags=*/0, GL_TIMEOUT_IGNORED);
 
                        shared_ptr<Frame> frame = frame_from_pbo(qf.resources->pbo_contents, global_flags.width, global_flags.height);
+                       assert(frame->exif_data.empty());
 
                        // Now JPEG encode it, and send it on to the stream.
-                       string jpeg = encode_jpeg(frame->y.get(), frame->cb.get(), frame->cr.get(), global_flags.width, global_flags.height);
+                       string jpeg = encode_jpeg(frame->y.get(), frame->cb.get(), frame->cr.get(), global_flags.width, global_flags.height, /*exif_data=*/"");
 
                        AVPacket pkt;
                        av_init_packet(&pkt);
@@ -727,7 +741,7 @@ void VideoStream::encode_thread_func()
                        }
 
                        // Now JPEG encode it, and send it on to the stream.
-                       string jpeg = encode_jpeg(frame->y.get(), frame->cb.get(), frame->cr.get(), global_flags.width, global_flags.height);
+                       string jpeg = encode_jpeg(frame->y.get(), frame->cb.get(), frame->cr.get(), global_flags.width, global_flags.height, move(qf.exif_data));
                        if (qf.flow_tex != 0) {
                                compute_flow->release_texture(qf.flow_tex);
                        }