for bug #248, use simple buffer for hls.

@@ -198,7 +198,7 @@ public:
 
         return ret;
     }
-    static int write_frame(SrsFileWriter* writer, SrsMpegtsFrame* frame, SrsBuffer* buffer)
+    static int write_frame(SrsFileWriter* writer, SrsMpegtsFrame* frame, SrsSimpleBuffer* buffer)
     {
         int ret = ERROR_SUCCESS;
         
@@ -396,6 +396,56 @@ private:
     }
 };
 
+SrsSimpleBuffer::SrsSimpleBuffer()
+{
+}
+
+SrsSimpleBuffer::~SrsSimpleBuffer()
+{
+}
+
+int SrsSimpleBuffer::length()
+{
+    int len = (int)data.size();
+    srs_assert(len >= 0);
+    return len;
+}
+
+char* SrsSimpleBuffer::bytes()
+{
+    return (length() == 0)? NULL : &data.at(0);
+}
+
+void SrsSimpleBuffer::erase(int size)
+{
+    if (size <= 0) {
+        return;
+    }
+    
+    if (size >= length()) {
+        data.clear();
+        return;
+    }
+    
+    data.erase(data.begin(), data.begin() + size);
+}
+
+void SrsSimpleBuffer::append(const char* bytes, int size)
+{
+    srs_assert(size > 0);
+
+    data.insert(data.end(), bytes, bytes + size);
+}
+
+SrsHlsAacJitter::SrsHlsAacJitter()
+{
+    base_pts = 0;
+    nb_samples = 0;
+
+    // TODO: config it, 0 means no adjust
+    sync_ms = SRS_CONF_DEFAULT_AAC_SYNC;
+}
+
 SrsHlsAacJitter::~SrsHlsAacJitter()
 {
 }
@@ -481,7 +531,7 @@ int SrsTSMuxer::open(string _path)
     return ret;
 }
 
-int SrsTSMuxer::write_audio(SrsMpegtsFrame* af, SrsBuffer* ab)
+int SrsTSMuxer::write_audio(SrsMpegtsFrame* af, SrsSimpleBuffer* ab)
 {
     int ret = ERROR_SUCCESS;
     
@@ -492,7 +542,7 @@ int SrsTSMuxer::write_audio(SrsMpegtsFrame* af, SrsBuffer* ab)
     return ret;
 }
 
-int SrsTSMuxer::write_video(SrsMpegtsFrame* vf, SrsBuffer* vb)
+int SrsTSMuxer::write_video(SrsMpegtsFrame* vf, SrsSimpleBuffer* vb)
 {
     int ret = ERROR_SUCCESS;
     
@@ -538,15 +588,6 @@ void SrsHlsSegment::update_duration(int64_t current_frame_dts)
     return;
 }
 
-SrsHlsAacJitter::SrsHlsAacJitter()
-{
-    base_pts = 0;
-    nb_samples = 0;
-
-    // TODO: config it, 0 means no adjust
-    sync_ms = SRS_CONF_DEFAULT_AAC_SYNC;
-}
-
 SrsHlsMuxer::SrsHlsMuxer()
 {
     hls_fragment = hls_window = 0;
@@ -654,7 +695,7 @@ bool SrsHlsMuxer::is_segment_overflow()
     return current->duration >= hls_fragment;
 }
 
-int SrsHlsMuxer::flush_audio(SrsMpegtsFrame* af, SrsBuffer* ab)
+int SrsHlsMuxer::flush_audio(SrsMpegtsFrame* af, SrsSimpleBuffer* ab)
 {
     int ret = ERROR_SUCCESS;
 
@@ -681,7 +722,7 @@ int SrsHlsMuxer::flush_audio(SrsMpegtsFrame* af, SrsBuffer* ab)
     return ret;
 }
 
-int SrsHlsMuxer::flush_video(SrsMpegtsFrame* /*af*/, SrsBuffer* /*ab*/, SrsMpegtsFrame* vf, SrsBuffer* vb)
+int SrsHlsMuxer::flush_video(SrsMpegtsFrame* /*af*/, SrsSimpleBuffer* /*ab*/, SrsMpegtsFrame* vf, SrsSimpleBuffer* vb)
 {
     int ret = ERROR_SUCCESS;
 
@@ -964,8 +1005,8 @@ SrsHlsCache::SrsHlsCache()
 {
     aac_jitter = new SrsHlsAacJitter();
     
-    ab = new SrsBuffer();
-    vb = new SrsBuffer();
+    ab = new SrsSimpleBuffer();
+    vb = new SrsSimpleBuffer();
     
     af = new SrsMpegtsFrame();
     vf = new SrsMpegtsFrame();

@@ -50,7 +50,6 @@ extern int aac_sample_rates[];
 #include <string>
 #include <vector>
 
-class SrsBuffer;
 class SrsSharedPtrMessage;
 class SrsCodecSample;
 class SrsMpegtsFrame;
@@ -64,6 +63,43 @@ class SrsSource;
 class SrsFileWriter;
 
 /**
+* the simple buffer use vector to append bytes,
+* it's for hls, and need to be refined in future.
+*/
+class SrsSimpleBuffer
+{
+private:
+    std::vector<char> data;
+public:
+    SrsSimpleBuffer();
+    virtual ~SrsSimpleBuffer();
+public:
+    /**
+    * get the length of buffer. empty if zero.
+    * @remark assert length() is not negative.
+    */
+    virtual int length();
+    /**
+    * get the buffer bytes.
+    * @return the bytes, NULL if empty.
+    */
+    virtual char* bytes();
+    /**
+    * erase size of bytes from begin.
+    * @param size to erase size of bytes. 
+    *       clear if size greater than or equals to length()
+    * @remark ignore size is not positive.
+    */
+    virtual void erase(int size);
+    /**
+    * append specified bytes to buffer.
+    * @param size the size of bytes
+    * @remark assert size is positive.
+    */
+    virtual void append(const char* bytes, int size);
+};
+
+/**
 * jitter correct for audio,
 * the sample rate 44100/32000 will lost precise,
 * when mp4/ts(tbn=90000) covert to flv/rtmp(1000),
@@ -109,8 +145,8 @@ public:
     virtual ~SrsTSMuxer();
 public:
     virtual int open(std::string _path);
-    virtual int write_audio(SrsMpegtsFrame* af, SrsBuffer* ab);
-    virtual int write_video(SrsMpegtsFrame* vf, SrsBuffer* vb);
+    virtual int write_audio(SrsMpegtsFrame* af, SrsSimpleBuffer* ab);
+    virtual int write_video(SrsMpegtsFrame* vf, SrsSimpleBuffer* vb);
     virtual void close();
 };
 
@@ -196,8 +232,8 @@ public:
     * that is whether the current segment duration >= the segment in config
     */
     virtual bool is_segment_overflow();
-    virtual int flush_audio(SrsMpegtsFrame* af, SrsBuffer* ab);
-    virtual int flush_video(SrsMpegtsFrame* af, SrsBuffer* ab, SrsMpegtsFrame* vf, SrsBuffer* vb);
+    virtual int flush_audio(SrsMpegtsFrame* af, SrsSimpleBuffer* ab);
+    virtual int flush_video(SrsMpegtsFrame* af, SrsSimpleBuffer* ab, SrsMpegtsFrame* vf, SrsSimpleBuffer* vb);
     /**
     * close segment(ts).
     * @param log_desc the description for log.
@@ -231,9 +267,9 @@ class SrsHlsCache
 private:
     // current frame and buffer
     SrsMpegtsFrame* af;
-    SrsBuffer* ab;
+    SrsSimpleBuffer* ab;
     SrsMpegtsFrame* vf;
-    SrsBuffer* vb;
+    SrsSimpleBuffer* vb;
 private:
     // the audio cache buffer start pts, to flush audio if full.
     int64_t audio_buffer_start_pts;