Fixing bug in vtt and adding scc2vtt example. (szatmary#41)

This runs against the existing ToS scc file and outputs vtt to stdout.

This isn't terribly dissimilar to the code for scc2srt (not shocking
that it's the case either).

examples/CMakeLists.txt

@@ -8,6 +8,10 @@ add_executable(ts2srt ts2srt.c ts.c)
 target_link_libraries(ts2srt caption)
 install(TARGETS ts2srt DESTINATION bin)
 
+add_executable(scc2vtt scc2vtt.c)
+target_link_libraries(scc2vtt caption)
+install(TARGETS scc2vtt DESTINATION bin)
+
 add_executable(srt2vtt srt2vtt.c)
 target_link_libraries(srt2vtt caption)
 install(TARGETS srt2vtt DESTINATION bin)

examples/scc2vtt.c

@@ -0,0 +1,63 @@
+/**********************************************************************************************/
+/* The MIT License                                                                            */
+/*                                                                                            */
+/* Copyright 2016-2017 Twitch Interactive, Inc. or its affiliates. All Rights Reserved.       */
+/*                                                                                            */
+/* Permission is hereby granted, free of charge, to any person obtaining a copy               */
+/* of this software and associated documentation files (the "Software"), to deal              */
+/* in the Software without restriction, including without limitation the rights               */
+/* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell                  */
+/* copies of the Software, and to permit persons to whom the Software is                      */
+/* furnished to do so, subject to the following conditions:                                   */
+/*                                                                                            */
+/* The above copyright notice and this permission notice shall be included in                 */
+/* all copies or substantial portions of the Software.                                        */
+/*                                                                                            */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR                 */
+/* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,                   */
+/* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE                */
+/* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER                     */
+/* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,              */
+/* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN                  */
+/* THE SOFTWARE.                                                                              */
+/**********************************************************************************************/
+#include "caption.h"
+#include "scc.h"
+#include "vtt.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char** argv)
+{
+
+    if (argc < 2) {
+        fprintf(stderr, "Usage: scc2vtt input.scc\n\nOutput: vtt file to stdin\n");
+        return 0;
+    }
+    int i;
+    scc_t* scc = NULL;
+    size_t scc_size = 0;
+    caption_frame_t frame;
+    vtt_t* vtt = 0;
+    utf8_char_t* scc_data_ptr = utf8_load_text_file(argv[1], &scc_size);
+    utf8_char_t* scc_data = scc_data_ptr;
+
+    vtt = vtt_new();
+    caption_frame_init(&frame);
+    scc_data += scc_to_608(&scc, scc_data);
+
+    while (scc->cc_size) {
+        for (i = 0; i < scc->cc_size; ++i) {
+            if (LIBCAPTION_READY == caption_frame_decode(&frame, scc->cc_data[i], scc->timestamp)) {
+                vtt_cue_from_caption_frame(&frame, vtt);
+            }
+        }
+
+        scc_data += scc_to_608(&scc, scc_data);
+    }
+
+    vtt_dump(vtt);
+    vtt_free(vtt);
+    free(scc_data_ptr);
+    return EXIT_SUCCESS;
+}

src/vtt.c

@@ -351,6 +351,7 @@ static void _dump(vtt_t* vtt)
         }
 
         printf("\r\n%s\r\n", vtt_block_data(block));
+        block = block->next;
     }
 }