diff options
Diffstat (limited to 'pica-client/videodevice.h')
| -rw-r--r-- | pica-client/videodevice.h | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/pica-client/videodevice.h b/pica-client/videodevice.h index 9ee4397..1b999c1 100644 --- a/pica-client/videodevice.h +++ b/pica-client/videodevice.h @@ -74,7 +74,12 @@ public: VideoDevice(QObject *parent = nullptr); ~VideoDevice(); - Q_INVOKABLE void configureCapture(QString deviceName, QString codec, int width, int height); + // preferCompressed asks for the camera's own compressed stream to be + // forwarded untouched when it offers one, saving the cost of decoding and + // re-encoding every frame. The codec that ends up being used is only + // known once the camera has been opened, and is reported by + // captureStarted() - it is not necessarily the one requested here. + Q_INVOKABLE void configureCapture(QString deviceName, int width, int height, bool preferCompressed); Q_INVOKABLE void configurePlayback(QString codec, int width, int height); // Push one complete encoded frame (already reassembled from 0x77 @@ -100,6 +105,12 @@ public slots: virtual void Close() override; signals: + // Emitted by Capture() once the camera is open and the format actually + // being sent is known - either the camera's own compressed format, when + // forwarding it untouched, or the one this class encodes to. Carries the + // values to announce to the peer, before any packet is emitted. + void captureStarted(QString codec, int width, int height); + // One fragment of an encoded frame, ready to be sent over the network. // isLastFragment marks the final fragment of a frame - it maps directly // onto the 0x77 sequence number's last fragment marker bit. @@ -117,11 +128,19 @@ public: // video capture API. Counterpart of AudioDevice::PlatformDriverName(). static QString PlatformDriverName(); + // Compressed formats the given camera can deliver by itself, as FFmpeg + // codec names, ordered by preference: the more efficient the codec, the + // earlier it comes. Empty if the camera offers none, or on platforms + // where the formats cannot be queried - in which case captured frames + // are decoded and re-encoded as usual. + static QStringList CompressedFormats(const QString &device); + private: QString m_deviceName; QString m_codec; int m_width; int m_height; + bool m_preferCompressed; QAtomicInt m_abort; @@ -129,6 +148,15 @@ private: QWaitCondition m_queueCond; QQueue<QByteArray> m_frameQueue; static const int kMaxQueueDepth = 2; + + // Sends one encoded frame out as one or more protocol sized fragments. + void emitFragments(const unsigned char *data, int size); + + // The two shapes Capture() can take: forwarding the camera's own + // compressed stream as it arrives, or decoding what the camera sends and + // re-encoding it. Both emit captureStarted() before their first packet. + void runPassthroughLoop(struct AVFormatContext *ifmt_ctx, struct AVStream *in_st, const QString &codec); + void runTranscodeLoop(struct AVFormatContext *ifmt_ctx, struct AVStream *in_st); }; #endif // VIDEODEVICE_H |