for #293, add aac encoder for http aac stream.

trunk/src/kernel/srs_kernel_aac.hpp

@@ -0,0 +1,94 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013-2015 winlin
+
+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.
+*/
+
+#ifndef SRS_KERNEL_AAC_HPP
+#define SRS_KERNEL_AAC_HPP
+
+/*
+#include <srs_kernel_aac.hpp>
+*/
+#include <srs_core.hpp>
+
+#include <string>
+
+class SrsStream;
+class SrsFileWriter;
+class SrsFileReader;
+
+/**
+* encode data to flv file.
+*/
+class SrsAacEncoder
+{
+private:
+    SrsFileWriter* _fs;
+private:
+    SrsStream* tag_stream;
+public:
+    SrsAacEncoder();
+    virtual ~SrsAacEncoder();
+public:
+    /**
+    * initialize the underlayer file stream.
+    * @remark user can initialize multiple times to encode multiple flv files.
+    * @remark, user must free the fs, flv encoder never close/free it.
+    */
+    virtual int initialize(SrsFileWriter* fs);
+public:
+    /**
+    * write flv header.
+    * write following:
+    *   1. E.2 The FLV header
+    *   2. PreviousTagSize0 UI32 Always 0
+    * that is, 9+4=13bytes.
+    */
+    virtual int write_header();
+    virtual int write_header(char flv_header[9]);
+    /**
+    * write flv metadata. 
+    * @param type, the type of data, or other message type.
+    * @param data, the amf0 metadata which serialize from:
+    *   AMF0 string: onMetaData,
+    *   AMF0 object: the metadata object.
+    * @remark assert data is not NULL.
+    */
+    virtual int write_metadata(char type, char* data, int size);
+    /**
+    * write audio/video packet.
+    * @remark assert data is not NULL.
+    */
+    virtual int write_audio(int64_t timestamp, char* data, int size);
+    virtual int write_video(int64_t timestamp, char* data, int size);
+public:
+    /**
+    * get the tag size,
+    * including the tag header, body, and 4bytes previous tag size.
+    * @remark assert data_size is not negative.
+    */
+    static int size_tag(int data_size);
+private:
+    virtual int write_tag(char* header, int header_size, char* tag, int tag_size);
+};
+
+#endif
+