提炼MP4相关接口和代码

src/Record/MP4.cpp

@@ -18,6 +18,8 @@
 using namespace toolkit;
 namespace mediakit {
 
+/////////////////////////////////////////////////mp4_writer_t/////////////////////////////////////////////////
+
 struct mp4_writer_t {
     int is_fmp4;
     union {
@@ -102,28 +104,32 @@ int mp4_writer_init_segment(mp4_writer_t* mp4){
     }
 }
 
+/////////////////////////////////////////////////MP4FileIO/////////////////////////////////////////////////
+
 static struct mov_buffer_t s_io = {
         [](void *ctx, void *data, uint64_t bytes) {
-            MP4File *thiz = (MP4File *) ctx;
+            MP4FileIO *thiz = (MP4FileIO *) ctx;
             return thiz->onRead(data, bytes);
         },
         [](void *ctx, const void *data, uint64_t bytes) {
-            MP4File *thiz = (MP4File *) ctx;
+            MP4FileIO *thiz = (MP4FileIO *) ctx;
             return thiz->onWrite(data, bytes);
         },
         [](void *ctx, uint64_t offset) {
-            MP4File *thiz = (MP4File *) ctx;
+            MP4FileIO *thiz = (MP4FileIO *) ctx;
             return thiz->onSeek(offset);
         },
         [](void *ctx) {
-            MP4File *thiz = (MP4File *) ctx;
+            MP4FileIO *thiz = (MP4FileIO *) ctx;
             return thiz->onTell();
         }
 };
 
-MP4File::Writer MP4File::createWriter(int flags, bool is_fmp4){
+MP4FileIO::Writer MP4FileIO::createWriter(int flags, bool is_fmp4){
     Writer writer;
-    writer.reset(mp4_writer_create(is_fmp4, &s_io,this, flags),[](mp4_writer_t *ptr){
+    Ptr self = shared_from_this();
+    //保存自己的强引用，防止提前释放
+    writer.reset(mp4_writer_create(is_fmp4, &s_io,this, flags),[self](mp4_writer_t *ptr){
         if(ptr){
             mp4_writer_destroy(ptr);
         }
@@ -134,9 +140,11 @@ MP4File::Writer MP4File::createWriter(int flags, bool is_fmp4){
     return writer;
 }
 
-MP4File::Reader MP4File::createReader(){
+MP4FileIO::Reader MP4FileIO::createReader(){
     Reader reader;
-    reader.reset(mov_reader_create(&s_io,this),[](mov_reader_t *ptr){
+    Ptr self = shared_from_this();
+    //保存自己的强引用，防止提前释放
+    reader.reset(mov_reader_create(&s_io,this),[self](mov_reader_t *ptr){
         if(ptr){
             mov_reader_destroy(ptr);
         }
@@ -147,6 +155,8 @@ MP4File::Reader MP4File::createReader(){
     return reader;
 }
 
+/////////////////////////////////////////////////////MP4FileDisk/////////////////////////////////////////////////////////
+
 #if defined(_WIN32) || defined(_WIN64)
     #define fseek64 _fseeki64
     #define ftell64 _ftelli64
@@ -155,7 +165,7 @@ MP4File::Reader MP4File::createReader(){
     #define ftell64 ftell
 #endif
 
-void MP4File::openFile(const char *file,const char *mode) {
+void MP4FileDisk::openFile(const char *file, const char *mode) {
     //创建文件
     auto fp = File::create_file(file, mode);
     if(!fp){
@@ -183,26 +193,26 @@ void MP4File::openFile(const char *file,const char *mode) {
     });
 }
 
-void MP4File::closeFile() {
+void MP4FileDisk::closeFile() {
     _file = nullptr;
 }
 
-int MP4File::onRead(void *data, uint64_t bytes) {
+int MP4FileDisk::onRead(void *data, uint64_t bytes) {
     if (bytes == fread(data, 1, bytes, _file.get())){
         return 0;
     }
     return 0 != ferror(_file.get()) ? ferror(_file.get()) : -1 /*EOF*/;
 }
 
-int MP4File::onWrite(const void *data, uint64_t bytes) {
+int MP4FileDisk::onWrite(const void *data, uint64_t bytes) {
     return bytes == fwrite(data, 1, bytes, _file.get()) ? 0 : ferror(_file.get());
 }
 
-int MP4File::onSeek(uint64_t offset) {
+int MP4FileDisk::onSeek(uint64_t offset) {
     return fseek64(_file.get(), offset, SEEK_SET);
 }
 
-uint64_t MP4File::onTell() {
+uint64_t MP4FileDisk::onTell() {
     return ftell64(_file.get());
 }
 

src/Record/MP4.h

@@ -23,6 +23,7 @@
 using namespace std;
 namespace mediakit {
 
+//以下是fmp4/mov的通用接口，简单包装了ireader/media-server的接口
 typedef struct mp4_writer_t mp4_writer_t;
 mp4_writer_t* mp4_writer_create(int is_fmp4, const struct mov_buffer_t *buffer, void* param, int flags);
 void mp4_writer_destroy(mp4_writer_t* mp4);
@@ -34,23 +35,84 @@ int mp4_writer_write_l(mp4_writer_t* mp4, int track, const void* data, size_t by
 int mp4_writer_save_segment(mp4_writer_t* mp4);
 int mp4_writer_init_segment(mp4_writer_t* mp4);
 
-class MP4File {
+//mp4文件IO的抽象接口类
+class MP4FileIO : public std::enable_shared_from_this<MP4FileIO> {
 public:
-    friend struct mov_buffer_t;
+    using Ptr = std::shared_ptr<MP4FileIO>;
-    typedef std::shared_ptr<mp4_writer_t> Writer;
+    using Writer = std::shared_ptr<mp4_writer_t>;
-    typedef std::shared_ptr<mov_reader_t> Reader;
+    using Reader = std::shared_ptr<mov_reader_t>;
-    MP4File() = default;
-    virtual ~MP4File() = default;
 
-    Writer createWriter(int flags, bool is_fmp4 = false);
+    MP4FileIO() = default;
-    Reader createReader();
+    virtual ~MP4FileIO() = default;
+
+    /**
+     * 创建mp4复用器
+     * @param flags 支持0、MOV_FLAG_FASTSTART、MOV_FLAG_SEGMENT
+     * @param is_fmp4 是否为fmp4还是普通mp4
+     * @return mp4复用器
+     */
+    virtual Writer createWriter(int flags, bool is_fmp4 = false);
+
+    /**
+     * 创建mp4解复用器
+     * @return mp4解复用器
+     */
+    virtual Reader createReader();
+
+    /**
+     * 获取文件读写位置
+     */
+    virtual uint64_t onTell() = 0;
+
+    /**
+     * seek至文件某处
+     * @param offset 文件偏移量
+     * @return 是否成功(0成功)
+     */
+    virtual int onSeek(uint64_t offset) = 0;
+
+    /**
+     * 从文件读取一定数据
+     * @param data 数据存放指针
+     * @param bytes 指针长度
+     * @return 是否成功(0成功)
+     */
+    virtual int onRead(void *data, uint64_t bytes) = 0;
+
+    /**
+     * 写入文件一定数据
+     * @param data 数据指针
+     * @param bytes 数据长度
+     * @return 是否成功(0成功)
+     */
+    virtual int onWrite(const void *data, uint64_t bytes) = 0;
+};
+
+//磁盘MP4文件类
+class MP4FileDisk : public MP4FileIO {
+public:
+    using Ptr = std::shared_ptr<MP4FileDisk>;
+    MP4FileDisk() = default;
+    ~MP4FileDisk() override = default;
+
+    /**
+     * 打开磁盘文件
+     * @param file 文件路径
+     * @param mode fopen的方式
+     */
     void openFile(const char *file, const char *mode);
+
+    /**
+     * 关闭磁盘文件
+     */
     void closeFile();
 
-    int onRead(void* data, uint64_t bytes);
+protected:
-    int onWrite(const void* data, uint64_t bytes);
+    uint64_t onTell() override;
-    int onSeek( uint64_t offset);
+    int onSeek(uint64_t offset) override;
-    uint64_t onTell();
+    int onRead(void *data, uint64_t bytes) override;
+    int onWrite(const void *data, uint64_t bytes) override;
+
 private:
     std::shared_ptr<FILE> _file;
 };

src/Record/MP4Demuxer.cpp

@@ -19,18 +19,20 @@
 using namespace toolkit;
 namespace mediakit {
 
-MP4Demuxer::MP4Demuxer(const char *file) {
+MP4Demuxer::MP4Demuxer() {}
-    openFile(file,"rb+");
-    _mov_reader = createReader();
-    getAllTracks();
-    _duration_ms = mov_reader_getduration(_mov_reader.get());
-}
 
 MP4Demuxer::~MP4Demuxer() {
     _mov_reader = nullptr;
     closeFile();
 }
 
+void MP4Demuxer::openMP4(const string &file){
+    openFile(file.data(),"rb+");
+    _mov_reader = createReader();
+    getAllTracks();
+    _duration_ms = mov_reader_getduration(_mov_reader.get());
+}
+
 int MP4Demuxer::getAllTracks() {
     static mov_reader_trackinfo_t s_on_track = {
             [](void *param, uint32_t track, uint8_t object, int width, int height, const void *extra, size_t bytes) {

src/Record/MP4Demuxer.h

@@ -16,22 +16,58 @@
 #include "Util/ResourcePool.h"
 namespace mediakit {
 
-class MP4Demuxer : public MP4File, public TrackSource{
+class MP4Demuxer : public MP4FileDisk, public TrackSource{
 public:
     typedef std::shared_ptr<MP4Demuxer> Ptr;
-    MP4Demuxer(const char *file);
+
+    /**
+     * 创建mp4解复用器
+     */
+    MP4Demuxer();
     ~MP4Demuxer() override;
+
+    /**
+     * 打开文件
+     * @param file mp4文件路径
+     */
+    void openMP4(const string &file);
+
+    /**
+     * 移动时间轴至某处
+     * @param stamp_ms 预期的时间轴位置，单位毫秒
+     * @return 时间轴位置
+     */
     int64_t seekTo(int64_t stamp_ms);
+
+    /**
+     * 读取一帧数据
+     * @param keyFrame 是否为关键帧
+     * @param eof 是否文件读取完毕
+     * @return 帧数据,可能为空
+     */
     Frame::Ptr readFrame(bool &keyFrame, bool &eof);
+
+    /**
+     * 获取所有Track信息
+     * @param trackReady 是否要求track为就绪状态
+     * @return 所有Track
+     */
     vector<Track::Ptr> getTracks(bool trackReady) const override;
+
+    /**
+     * 获取文件长度
+     * @return 文件长度，单位毫秒
+     */
     uint64_t getDurationMS() const;
+
 private:
     int getAllTracks();
     void onVideoTrack(uint32_t track_id, uint8_t object, int width, int height, const void *extra, size_t bytes);
     void onAudioTrack(uint32_t track_id, uint8_t object, int channel_count, int bit_per_sample, int sample_rate, const void *extra, size_t bytes);
     Frame::Ptr makeFrame(uint32_t track_id, const Buffer::Ptr &buf, int64_t pts, int64_t dts);
+
 private:
-    MP4File::Reader _mov_reader;
+    Reader _mov_reader;
     uint64_t _duration_ms = 0;
     map<int, Track::Ptr> _track_to_codec;
     ResourcePool<BufferRaw> _buffer_pool;

src/Record/MP4Muxer.cpp

@@ -14,21 +14,20 @@
 #include "Extension/H264.h"
 namespace mediakit{
 
-MP4Muxer::MP4Muxer(const char *file) {
+MP4Muxer::MP4Muxer() {}
-    _file_name = file;
-    openMP4();
-}
 
 MP4Muxer::~MP4Muxer() {
     closeMP4();
 }
 
-void MP4Muxer::openMP4(){
+void MP4Muxer::openMP4(const string &file){
+    _file_name = file;
     closeMP4();
     openFile(_file_name.data(), "wb+");
     GET_CONFIG(bool, mp4FastStart, Record::kFastStart);
     _mov_writter = createWriter(mp4FastStart ? MOV_FLAG_FASTSTART : 0, false);
 }
+
 void MP4Muxer::closeMP4(){
     _mov_writter = nullptr;
     closeFile();
@@ -38,7 +37,7 @@ void MP4Muxer::resetTracks() {
     _codec_to_trackid.clear();
     _started = false;
     _have_video = false;
-    openMP4();
+    openMP4(_file_name);
 }
 
 void MP4Muxer::inputFrame(const Frame::Ptr &frame) {

src/Record/MP4Muxer.h

@@ -23,11 +23,11 @@
 
 namespace mediakit{
 
-class MP4Muxer : public MediaSinkInterface, public MP4File{
+class MP4Muxer : public MediaSinkInterface, public MP4FileDisk{
 public:
     typedef std::shared_ptr<MP4Muxer> Ptr;
 
-    MP4Muxer(const char *file);
+    MP4Muxer();
     ~MP4Muxer() override;
 
     /**
@@ -44,13 +44,18 @@ public:
      */
     void resetTracks() override ;
 
+    /**
+     * 打开mp4
+     * @param file 文件完整路径
+     */
+    void openMP4(const string &file);
+
     /**
      * 手动关闭文件(对象析构时会自动关闭)
      */
     void closeMP4();
 
 private:
-    void openMP4();
     void stampSync();
 
 private:
@@ -62,8 +67,8 @@ private:
     List<Frame::Ptr> _frameCached;
     bool _started = false;
     bool _have_video = false;
-    MP4File::Writer _mov_writter;
     string _file_name;
+    Writer _mov_writter;
 };
 
 }//namespace mediakit

src/Record/MP4Reader.cpp

@@ -29,7 +29,8 @@ MP4Reader::MP4Reader(const string &strVhost,const string &strApp, const string &
         strFileName = File::absolutePath(strFileName,recordPath);
     }
 
-    _demuxer = std::make_shared<MP4Demuxer>(strFileName.data());
+    _demuxer = std::make_shared<MP4Demuxer>();
+    _demuxer->openMP4(strFileName);
     _mediaMuxer.reset(new MultiMediaSourceMuxer(strVhost, strApp, strId, _demuxer->getDurationMS() / 1000.0, true, true, false, false));
     auto tracks = _demuxer->getTracks(false);
     if(tracks.empty()){

src/Record/MP4Reader.h

@@ -35,6 +35,7 @@ public:
      * 意思是在文件流化结束之前或中断之前,MP4Reader对象是不会被销毁的(不管有没有被外部对象持有)
      */
     void startReadMP4();
+
 private:
     //MediaSourceEvent override
     bool seekTo(MediaSource &sender,uint32_t ui32Stamp) override;
@@ -45,15 +46,16 @@ private:
     uint32_t getCurrentStamp();
     void setCurrentStamp(uint32_t ui32Stamp);
     bool seekTo(uint32_t ui32Stamp);
+
 private:
-    recursive_mutex _mtx;
+    bool _have_video = false;
-    MultiMediaSourceMuxer::Ptr _mediaMuxer;
     uint32_t _seek_to;
+    recursive_mutex _mtx;
     Ticker _seek_ticker;
     Timer::Ptr _timer;
     EventPoller::Ptr _poller;
     MP4Demuxer::Ptr _demuxer;
-    bool _have_video = false;
+    MultiMediaSourceMuxer::Ptr _mediaMuxer;
 };
 
 } /* namespace mediakit */

src/Record/MP4Recorder.cpp

@@ -53,7 +53,8 @@ void MP4Recorder::createFile() {
                 + strTime + ".mp4";
 
     try {
-        _muxer = std::make_shared<MP4Muxer>(strFileTmp.data());
+        _muxer = std::make_shared<MP4Muxer>();
+        _muxer->openMP4(strFileTmp);
         for (auto &track :_tracks) {
             //添加track
             _muxer->addTrack(track);