cosmetic changes (indentation, doxygen comments, braces, put structures for API to header, ...)

Originally committed as revision 19773 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/seek.h

 /*
- * Utility functions for seeking for use within FFmpeg format handlers.
+ * seek utility functions for use within format handlers
  *
  * Copyright (c) 2009 Ivan Schreter
  *
@@ -25,30 +25,59 @@
 
 #include "avformat.h"
 
-/// Opaque structure for parser state.
-typedef struct AVParserState AVParserState;
+/**
+ * structure to store parser state of one AVStream
+ */
+typedef struct AVParserStreamState {
+    // saved members of AVStream
+    AVCodecParserContext   *parser;
+    AVPacket                cur_pkt;
+    int64_t                 last_IP_pts;
+    int64_t                 cur_dts;
+    int64_t                 reference_dts;
+    const uint8_t          *cur_ptr;
+    int                     cur_len;
+    int                     probe_packets;
+} AVParserStreamState;
+
+/**
+ * structure to store parser state of AVFormat
+ */
+typedef struct AVParserState {
+    int64_t         fpos;                   ///< file position at the time of call
+
+    // saved members of AVFormatContext
+    AVStream       *cur_st;                 ///< current stream.
+    AVPacketList   *packet_buffer;          ///< packet buffer of original state
+    AVPacketList   *raw_packet_buffer;      ///< raw packet buffer of original state
+    int raw_packet_buffer_remaining_size;   ///< remaining space in raw_packet_buffer
+
+    // saved info for streams
+    int                  nb_streams;        ///< number of streams with stored state
+    AVParserStreamState *stream_states;     ///< states of individual streams (array)
+} AVParserState;
 
 /**
- * Search for sync point of all active streams.
+ * Search for the sync point of all active streams.
  *
- * This is not supposed to be called directly by a user application,
+ * This routine is not supposed to be called directly by a user application,
  * but by demuxers.
  *
- * A sync point is a point in stream, so that decoding from this point,
- * output of decoders of all streams synchronizes closest to given timestamp
- * ts (but taking timestamp limits into account, i.e., no sooner than ts_min
- * and no later than ts_max).
+ * A sync point is defined as a point in stream, such that, when decoding start
+ * from this point, the decoded output of all streams synchronizes closest
+ * to the given timestamp ts. This routine also takes timestamp limits into account.
+ * Thus, the output will synchronize no sooner than ts_min and no later than ts_max.
  *
- * @param stream_index stream index for time base reference of timestamps.
- * @param pos approximate position where to start searching for key frames.
- * @param min_ts minimum allowed timestamp (position, if AVSEEK_FLAG_BYTE set).
- * @param ts target timestamp (or position, if AVSEEK_FLAG_BYTE set in flags).
- * @param max_ts maximum allowed timestamp (position, if AVSEEK_FLAG_BYTE set).
- * @param flags if AVSEEK_FLAG_ANY is set, seek to any frame, otherwise only
- *              to a keyframe. If AVSEEK_FLAG_BYTE is set, search by
- *              position, not by timestamp.
- * @return < 0 if no such sync point could be found, otherwise stream position
- *              (stream is repositioned to this position).
+ * @param stream_index stream index for time base reference of timestamps
+ * @param pos          approximate position where to start searching for key frames
+ * @param min_ts       minimum allowed timestamp (position, if AVSEEK_FLAG_BYTE set)
+ * @param ts           target timestamp (or position, if AVSEEK_FLAG_BYTE set in flags)
+ * @param max_ts       maximum allowed timestamp (position, if AVSEEK_FLAG_BYTE set)
+ * @param flags        if AVSEEK_FLAG_ANY is set, seek to any frame, otherwise only
+ *                     to a keyframe. If AVSEEK_FLAG_BYTE is set, search by
+ *                     position, not by timestamp.
+ * @return -1 if no such sync point could be found, otherwise stream position
+ *                     (stream is repositioned to this position)
  */
 int64_t ff_gen_syncpoint_search(AVFormatContext *s,
                                 int stream_index,
@@ -61,16 +90,16 @@ int64_t ff_gen_syncpoint_search(AVFormatContext *s,
 /**
  * Store current parser state and file position.
  *
- * This function can be used by demuxers before destructive seeking algorithm
- * to store parser state. After the seek, depending on outcome, original state
- * can be restored or new state kept and original state freed.
+ * This function can be used by demuxers before a destructive seeking algorithm
+ * to store the parser state. Depending on the outcome of the seek, either the original
+ * state can be restored or the new state kept and the original state freed.
  *
- * @note As a side effect, original parser state is reset, since structures
- *       are relinked to stored state instead of being deeply-copied (for
- *       performance reasons and to keep code simple).
+ * @note As a side effect, the original parser state is reset, since structures
+ *       are relinked to the stored state instead of being deeply-copied (for
+ *       performance reasons and to keep the code simple).
  *
- * @param s context from which to save state.
- * @return parser state object or NULL if memory could not be allocated.
+ * @param s context from which to save state
+ * @return parser state object or NULL if memory could not be allocated
  */
 AVParserState *ff_store_parser_state(AVFormatContext *s);
 
@@ -78,19 +107,19 @@ AVParserState *ff_store_parser_state(AVFormatContext *s);
  * Restore previously saved parser state and file position.
  *
  * Saved state will be invalidated and freed by this call, since internal
- * structures will be relinked back to stored state instead of being
+ * structures will be relinked back to the stored state instead of being
  * deeply-copied.
  *
- * @param s context to which to restore state (same as used for storing state).
- * @param state state to restore.
+ * @param s     context to which to restore state (same as used for storing state)
+ * @param state state to restore
  */
 void ff_restore_parser_state(AVFormatContext *s, AVParserState *state);
 
 /**
  * Free previously saved parser state.
  *
- * @param s context to which the state belongs (same as used for storing state).
- * @param state state to free.
+ * @param s     context to which the state belongs (same as used for storing state)
+ * @param state state to free
  */
 void ff_free_parser_state(AVFormatContext *s, AVParserState *state);