Upstream version 7.36.149.0

[platform/framework/web/crosswalk.git] / src / third_party / libvpx / source / libvpx / webmdec.h

diff --git a/src/third_party/libvpx/source/libvpx/webmdec.h b/src/third_party/libvpx/source/libvpx/webmdec.h
index fa5a52e..29b815d 100644 (file)
--- a/src/third_party/libvpx/source/libvpx/webmdec.h
+++ b/src/third_party/libvpx/source/libvpx/webmdec.h
@@ -16,29 +16,53 @@
 extern "C" {
 #endif
 
-struct nestegg;
-struct nestegg_packet;
 struct VpxInputContext;
 
 struct WebmInputContext {
-  uint32_t chunk;
-  uint32_t chunks;
-  uint32_t video_track;
-  struct nestegg *nestegg_ctx;
-  struct nestegg_packet *pkt;
+  void *reader;
+  void *segment;
+  uint8_t *buffer;
+  const void *cluster;
+  const void *block_entry;
+  const void *block;
+  int block_frame_index;
+  int video_track_index;
+  uint64_t timestamp_ns;
 };
 
+// Checks if the input is a WebM file. If so, initializes WebMInputContext so
+// that webm_read_frame can be called to retrieve a video frame.
+// Returns 1 on success and 0 on failure or input is not WebM file.
+// TODO(vigneshv): Refactor this function into two smaller functions specific
+// to their task.
 int file_is_webm(struct WebmInputContext *webm_ctx,
                  struct VpxInputContext *vpx_ctx);
 
+// Reads a WebM Video Frame. Memory for the buffer is created, owned and managed
+// by this function. For the first call, |buffer| should be NULL and
+// |*bytes_in_buffer| should be 0. Once all the frames are read and used,
+// webm_free() should be called, otherwise there will be a leak.
+// Parameters:
+//      webm_ctx - WebmInputContext object
+//      buffer - pointer where the frame data will be filled.
+//      bytes_in_buffer - pointer to buffer size.
+//      buffer_size - unused TODO(vigneshv): remove this
+// Return values:
+//      0 - Success
+//      1 - End of Stream
+//     -1 - Error
+// TODO(vigneshv): Make the return values consistent across all functions in
+// this file.
 int webm_read_frame(struct WebmInputContext *webm_ctx,
                     uint8_t **buffer,
                     size_t *bytes_in_buffer,
                     size_t *buffer_size);
 
+// Guesses the frame rate of the input file based on the container timestamps.
 int webm_guess_framerate(struct WebmInputContext *webm_ctx,
                          struct VpxInputContext *vpx_ctx);
 
+// Resets the WebMInputContext.
 void webm_free(struct WebmInputContext *webm_ctx);
 
 #ifdef __cplusplus