Support interlaced inputs with the official DeckLink driver.

[nageru] / mixer.cpp

diff --git a/mixer.cpp b/mixer.cpp
index 44993b55b6b867d685623e26232d5c151f04c879..1be5660fb7f9219d17a1a39a15841f6d0c5c47b5 100644 (file)
--- a/mixer.cpp
+++ b/mixer.cpp
@@ -363,6 +363,7 @@ void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 
        unsigned num_fields = video_format.interlaced ? 2 : 1;
        steady_clock::time_point frame_upload_start;
+       bool interlaced_stride = false;
        if (video_format.interlaced) {
                // Send the two fields along as separate frames; the other side will need to add
                // a deinterlacer to actually get this right.
@@ -371,6 +372,9 @@ void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
                assert(frame_length % 2 == 0);
                frame_length /= 2;
                num_fields = 2;
+               if (video_format.second_field_start == 1) {
+                       interlaced_stride = true;
+               }
                frame_upload_start = steady_clock::now();
        }
        userdata->last_interlaced = video_format.interlaced;
@@ -394,8 +398,13 @@ void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
                // Note that this means we must hold on to the actual frame data in <userdata>
                // until the upload command is run, but we hold on to <frame> much longer than that
                // (in fact, all the way until we no longer use the texture in rendering).
-               auto upload_func = [field, video_format, y_offset, cbcr_offset, cbcr_width, userdata]() {
-                       unsigned field_start_line = (field == 1) ? video_format.second_field_start : video_format.extra_lines_top + field * (video_format.height + 22);
+               auto upload_func = [field, video_format, y_offset, cbcr_offset, cbcr_width, interlaced_stride, userdata]() {
+                       unsigned field_start_line;
+                       if (field == 1) {
+                               field_start_line = video_format.second_field_start;
+                       } else {
+                               field_start_line = video_format.extra_lines_top;
+                       }
 
                        if (userdata->tex_y[field] == 0 ||
                            userdata->tex_cbcr[field] == 0 ||
@@ -433,16 +442,32 @@ void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 
                        glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
                        check_error();
+                       if (interlaced_stride) {
+                               glPixelStorei(GL_UNPACK_ROW_LENGTH, cbcr_width * 2);
+                               check_error();
+                       } else {
+                               glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+                               check_error();
+                       }
                        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, cbcr_width, video_format.height, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_cbcr_start));
                        check_error();
                        glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
                        check_error();
+                       if (interlaced_stride) {
+                               glPixelStorei(GL_UNPACK_ROW_LENGTH, video_format.width * 2);
+                               check_error();
+                       } else {
+                               glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+                               check_error();
+                       }
                        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, video_format.width, video_format.height, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_y_start));
                        check_error();
                        glBindTexture(GL_TEXTURE_2D, 0);
                        check_error();
                        glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
                        check_error();
+                       glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+                       check_error();
                };
 
                if (field == 1) {