Sequencer: srt export support.

This commit adds a new operator that will compile the list of text
strips into an srt file. No positioning is supported yet but will
be added later.

The operator can be found in the effect panel in the strip properties.

release/scripts/startup/bl_ui/space_sequencer.py

@@ -639,6 +639,7 @@ class SEQUENCER_PT_effect(SequencerButtonsPanel, Panel):
             if not strip.use_autocenter:
                 row.prop(strip, "xpos")
             row.prop(strip, "ypos")
+            layout.operator("sequencer.export_subtitles")
 
         col = layout.column(align=True)
         if strip.type == 'SPEED':

source/blender/editors/space_sequencer/sequencer_edit.c

@@ -35,9 +35,11 @@
 #include "MEM_guardedalloc.h"
 
 #include "BLI_blenlib.h"
-#include "BLI_math.h"
-#include "BLI_utildefines.h"
+#include "BLI_fileops.h"
 #include "BLI_ghash.h"
+#include "BLI_math.h"
+#include "BLI_timecode.h"
+#include "BLI_utildefines.h"
 
 #include "BLF_translation.h"
 
@@ -3825,3 +3827,112 @@ void SEQUENCER_OT_change_path(struct wmOperatorType *ot)
 	                               FILE_DEFAULTDISPLAY);
 	RNA_def_boolean(ot->srna, "use_placeholders", false, "Use Placeholders", "Use placeholders for missing frames of the strip");
 }
+
+static int sequencer_export_subtitles_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
+{
+	if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+		char filepath[FILE_MAX];
+
+		if (G.main->name[0] == 0)
+			BLI_strncpy(filepath, "untitled", sizeof(filepath));
+		else
+			BLI_strncpy(filepath, G.main->name, sizeof(filepath));
+
+		BLI_replace_extension(filepath, sizeof(filepath), ".srt");
+		RNA_string_set(op->ptr, "filepath", filepath);
+	}
+
+	WM_event_add_fileselect(C, op);
+
+	return OPERATOR_RUNNING_MODAL;
+}
+
+static int sequencer_export_subtitles_exec(bContext *C, wmOperator *op)
+{
+	Scene *scene = CTX_data_scene(C);
+	Sequence *seq = BKE_sequencer_active_get(scene);
+	Editing *ed = BKE_sequencer_editing_get(scene, false);
+	int iter = 0;
+	FILE *file;
+	char filepath[FILE_MAX];
+
+	if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+		BKE_report(op->reports, RPT_ERROR, "No filename given");
+		return OPERATOR_CANCELLED;
+	}
+
+	RNA_string_get(op->ptr, "filepath", filepath);
+	BLI_ensure_extension(filepath, sizeof(filepath), ".srt");
+
+	/* Avoid File write exceptions */
+	if (!BLI_exists(filepath)) {
+		BLI_make_existing_file(filepath);
+		if (!BLI_file_touch(filepath)) {
+			BKE_report(op->reports, RPT_ERROR, "Can't create subtitle file");
+			return OPERATOR_CANCELLED;
+		}
+	}
+	else if (!BLI_file_is_writable(filepath)) {
+		BKE_report(op->reports, RPT_ERROR, "Can't overwrite export file");
+		return OPERATOR_CANCELLED;
+	}
+
+	/* time to open and write! */
+	file = BLI_fopen(filepath, "w");
+
+	SEQ_BEGIN(ed, seq)
+	{
+		if (seq->type == SEQ_TYPE_TEXT) {
+			TextVars *data = seq->effectdata;
+			char timecode_str[32];
+			double sec;
+			int frac;
+			int len;
+			fprintf(file, "%d\n", iter++);
+			sec = FRA2TIME(seq->startdisp);
+			frac = 1000 * (sec - floor(sec));
+			sec = floor(sec);
+			BLI_timecode_string_from_time(timecode_str, sizeof(timecode_str), 1, sec, FPS, USER_TIMECODE_SMPTE_FULL);
+			len = strlen(timecode_str);
+			timecode_str[len - 3] = 0;
+			fprintf(file, "%s,%d", timecode_str, frac);
+			sec = FRA2TIME(seq->enddisp);
+			BLI_timecode_string_from_time(timecode_str, sizeof(timecode_str), 1, sec, FPS, USER_TIMECODE_SMPTE_FULL);
+			len = strlen(timecode_str);
+			timecode_str[len - 3] = 0;
+			fprintf(file, " --> %s,%d\n", timecode_str, frac);
+			fprintf(file, "%s\n\n", data->text);
+		}
+	}
+	SEQ_END
+
+	fclose(file);
+
+	return OPERATOR_FINISHED;
+}
+
+static int sequencer_strip_is_text_poll(bContext *C)
+{
+	Editing *ed;
+	Sequence *seq;
+	return (((ed = BKE_sequencer_editing_get(CTX_data_scene(C), false)) != NULL) && ((seq = ed->act_seq) != NULL) && (seq->type == SEQ_TYPE_TEXT));
+}
+
+void SEQUENCER_OT_export_subtitles(struct wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Export Subtitles";
+	ot->idname = "SEQUENCER_OT_export_subtitles";
+	ot->description = "Export .srt file containing text strips";
+
+	/* api callbacks */
+	ot->exec = sequencer_export_subtitles_exec;
+	ot->invoke = sequencer_export_subtitles_invoke;
+	ot->poll = sequencer_strip_is_text_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	WM_operator_properties_filesel(ot,  FILE_TYPE_FOLDER, FILE_BLENDER, FILE_SAVE,
+	                               WM_FILESEL_FILEPATH, FILE_DEFAULTDISPLAY);
+}

source/blender/editors/space_sequencer/sequencer_intern.h

@@ -134,6 +134,8 @@ void SEQUENCER_OT_paste(struct wmOperatorType *ot);
 void SEQUENCER_OT_rebuild_proxy(struct wmOperatorType *ot);
 void SEQUENCER_OT_enable_proxies(struct wmOperatorType *ot);
 
+void SEQUENCER_OT_export_subtitles(struct wmOperatorType *ot);
+
 /* preview specific operators */
 void SEQUENCER_OT_view_all_preview(struct wmOperatorType *ot);
 

source/blender/editors/space_sequencer/sequencer_ops.c

@@ -77,6 +77,8 @@ void sequencer_operatortypes(void)
 	WM_operatortype_append(SEQUENCER_OT_swap_data);
 	WM_operatortype_append(SEQUENCER_OT_rendersize);
 
+	WM_operatortype_append(SEQUENCER_OT_export_subtitles);
+
 	WM_operatortype_append(SEQUENCER_OT_copy);
 	WM_operatortype_append(SEQUENCER_OT_paste);