X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=ffmpeg_capture.h;h=328685b30208ef9416a7e97047fe23137e57533b;hb=96cb6414f85e0ef4d660b7bd56267303e80fcd05;hp=daf353eec6bdad339dc5e1ddbf87a4d36709726c;hpb=321995944e46e187ee515d358f137d94c30f090e;p=nageru diff --git a/ffmpeg_capture.h b/ffmpeg_capture.h index daf353e..328685b 100644 --- a/ffmpeg_capture.h +++ b/ffmpeg_capture.h @@ -6,20 +6,17 @@ // FFmpeg (thus the name), this means it can handle a very wide array of video // formats, and also things like network streaming and V4L capture, but it is // also significantly less integrated and optimized than the regular capture -// cards. In particular, the frames are always scaled and converted to 8-bit +// cards. In particular, the frames are always scaled and converted to 8-bit // RGBA on the CPU before being sent on to the GPU. // // Since we don't really know much about the video when building the chains, // there are some limitations. In particular, frames are always assumed to be // sRGB even if the video container says something else. We could probably -// try to load the video on startup and pick out the parameters at that point -// (which would probably also allow us to send Y'CbCr video through without -// CPU conversion), but it would require some more plumbing, and it would also -// fail if the file changes parameters midway, which is allowed in some formats. +// try to load the video on startup and pick out the parameters at that point, +// but it would require some more plumbing, and it would also fail if the file +// changes parameters midway, which is allowed in some formats. // -// There is currently no audio support. There is also no support for changing -// the video underway (unlike images), although there really should be. -// Finally, there is currently no support for controlling the video from Lua. +// There is currently no audio support. #include #include @@ -31,7 +28,20 @@ #include #include +#include + +extern "C" { +#include +#include +} + #include "bmusb/bmusb.h" +#include "ffmpeg_raii.h" +#include "quittable_sleeper.h" + +struct AVFormatContext; +struct AVFrame; +struct AVRational; class FFmpegCapture : public bmusb::CaptureInterface { @@ -53,6 +63,14 @@ public: { std::lock_guard lock(queue_mu); command_queue.push_back(QueuedCommand { QueuedCommand::REWIND }); + producer_thread_should_quit.wakeup(); + } + + void change_rate(double new_rate) + { + std::lock_guard lock(queue_mu); + command_queue.push_back(QueuedCommand { QueuedCommand::CHANGE_RATE, new_rate }); + producer_thread_should_quit.wakeup(); } // CaptureInterface. @@ -88,6 +106,14 @@ public: frame_callback = callback; } + // Used to get precise information about the Y'CbCr format used + // for a given frame. Only valid to call during the frame callback, + // and only when receiving a frame with pixel format PixelFormat_8BitYCbCrPlanar. + movit::YCbCrFormat get_current_frame_ycbcr_format() const + { + return current_frame_ycbcr_format; + } + void set_dequeue_thread_callbacks(std::function init, std::function cleanup) override { dequeue_init_callback = init; @@ -103,22 +129,20 @@ public: void configure_card() override; void start_bm_capture() override; void stop_dequeue_thread() override; - - // TODO: Specify error status through this. - bool get_disconnected() const override { return false; } + bool get_disconnected() const override { return false; } // We never unplug. std::map get_available_video_modes() const; void set_video_mode(uint32_t video_mode_id) override {} // Ignore. uint32_t get_current_video_mode() const override { return 0; } std::set get_available_pixel_formats() const override { - return std::set{ bmusb::PixelFormat_8BitRGBA }; + return std::set{ bmusb::PixelFormat_8BitBGRA, bmusb::PixelFormat_8BitYCbCrPlanar }; } void set_pixel_format(bmusb::PixelFormat pixel_format) override { - assert(pixel_format == bmusb::PixelFormat_8BitRGBA); + this->pixel_format = pixel_format; } bmusb::PixelFormat get_current_pixel_format() const override { - return bmusb::PixelFormat_8BitRGBA; + return pixel_format; } std::map get_available_video_inputs() const override { @@ -134,13 +158,27 @@ public: private: void producer_thread_func(); + void send_disconnected_frame(); bool play_video(const std::string &pathname); + void internal_rewind(); + + // Returns true if there was an error. + bool process_queued_commands(AVFormatContext *format_ctx, const std::string &pathname, timespec last_modified, bool *rewound); + + // Returns nullptr if no frame was decoded (e.g. EOF). + AVFrameWithDeleter decode_frame(AVFormatContext *format_ctx, AVCodecContext *codec_ctx, const std::string &pathname, int video_stream_index, bool *error); + + bmusb::VideoFormat construct_video_format(const AVFrame *frame, AVRational video_timebase); + bmusb::FrameAllocator::Frame make_video_frame(const AVFrame *frame, const std::string &pathname, bool *error); std::string description, filename; uint16_t timecode = 0; unsigned width, height; + bmusb::PixelFormat pixel_format = bmusb::PixelFormat_8BitBGRA; + movit::YCbCrFormat current_frame_ycbcr_format; bool running = false; int card_index = -1; + double rate = 1.0; bool has_dequeue_callbacks = false; std::function dequeue_init_callback = nullptr; @@ -152,12 +190,21 @@ private: std::unique_ptr owned_audio_frame_allocator; bmusb::frame_callback_t frame_callback = nullptr; - std::atomic producer_thread_should_quit{false}; + SwsContextWithDeleter sws_ctx; + int sws_last_width = -1, sws_last_height = -1, sws_last_src_format = -1; + AVPixelFormat sws_dst_format = AVPixelFormat(-1); // In practice, always initialized. + AVRational video_timebase; + + QuittableSleeper producer_thread_should_quit; std::thread producer_thread; + int64_t pts_origin, last_pts; + std::chrono::steady_clock::time_point start, next_frame_start; + std::mutex queue_mu; struct QueuedCommand { - enum Command { REWIND } command; + enum Command { REWIND, CHANGE_RATE } command; + double new_rate; // For CHANGE_RATE. }; std::vector command_queue; // Protected by . };