for #738, use reader and seeker for mp4 demuxer to seek for general mp4(ftyp-mdat-moov).

trunk/src/kernel/srs_kernel_io.hpp

@@ -51,6 +51,37 @@ public:
     virtual int read(void* buf, size_t size, ssize_t* nread) = 0;
 };
 
+/**
+ * The seeker to seek with a device.
+ */
+class ISrsSeeker
+{
+public:
+    ISrsSeeker();
+    virtual ~ISrsSeeker();
+public:
+    /**
+     * The lseek() function repositions the offset of the file descriptor fildes to the argument offset, according to the 
+     * directive whence. lseek() repositions the file pointer fildes as follows:
+     *      If whence is SEEK_SET, the offset is set to offset bytes.
+     *      If whence is SEEK_CUR, the offset is set to its current location plus offset bytes.
+     *      If whence is SEEK_END, the offset is set to the size of the file plus offset bytes.
+     * @param seeked Upon successful completion, lseek() returns the resulting offset location as measured in bytes from
+     *      the beginning of the file. NULL to ignore.
+     */
+    virtual int lseek(off_t offset, int whence, off_t* seeked) = 0;
+};
+
+/**
+ * The reader and seeker.
+ */
+class ISrsReadSeeker : virtual public ISrsReader, virtual public ISrsSeeker
+{
+public:
+    ISrsReadSeeker();
+    virtual ~ISrsReadSeeker();
+};
+
 /**
  * The writer to write stream data to channel.
  */
@@ -79,6 +110,8 @@ public:
     /**
      * write iov over writer.
      * @nwrite the actual written bytes. NULL to ignore.
+     * @remark for the HTTP FLV, to writev to improve performance.
+     *      @see https://github.com/ossrs/srs/issues/405
      */
     virtual int writev(const iovec *iov, int iov_size, ssize_t* nwrite) = 0;
 };
@@ -93,5 +126,15 @@ public:
     virtual ~ISrsWriter();
 };
 
+/**
+ * The writer and seeker.
+ */
+class ISrsWriteSeeker : virtual public ISrsWriter, virtual public ISrsSeeker
+{
+public:
+    ISrsWriteSeeker();
+    virtual ~ISrsWriteSeeker();
+};
+
 #endif