// 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.
+// You can get out the audio either as decoded or in raw form (Kaeru uses this).
#include <assert.h>
#include <stdint.h>
#include <string>
#include <thread>
+#include <movit/ycbcr.h>
+
+extern "C" {
+#include <libavresample/avresample.h>
+#include <libavutil/pixfmt.h>
+#include <libavutil/rational.h>
+#include <libavutil/samplefmt.h>
+}
+
#include "bmusb/bmusb.h"
+#include "ffmpeg_raii.h"
+#include "ref_counted_frame.h"
+#include "quittable_sleeper.h"
+
+struct AVFormatContext;
+struct AVFrame;
+struct AVRational;
+struct AVPacket;
class FFmpegCapture : public bmusb::CaptureInterface
{
{
std::lock_guard<std::mutex> lock(queue_mu);
command_queue.push_back(QueuedCommand { QueuedCommand::REWIND });
+ producer_thread_should_quit.wakeup();
+ }
+
+ void change_rate(double new_rate)
+ {
+ std::lock_guard<std::mutex> lock(queue_mu);
+ command_queue.push_back(QueuedCommand { QueuedCommand::CHANGE_RATE, new_rate });
+ producer_thread_should_quit.wakeup();
+ }
+
+ std::string get_filename() const
+ {
+ std::lock_guard<std::mutex> lock(filename_mu);
+ return filename;
+ }
+
+ void change_filename(const std::string &new_filename)
+ {
+ std::lock_guard<std::mutex> lock(filename_mu);
+ filename = new_filename;
+ should_interrupt = true;
+ }
+
+ // Will stop the stream even if it's hung on blocking I/O.
+ void disconnect()
+ {
+ should_interrupt = true;
}
// CaptureInterface.
return audio_frame_allocator;
}
- void set_frame_callback(bmusb::frame_callback_t callback) override
+ // FFmpegCapture-specific overload of set_frame_callback that also gives
+ // the raw original pts from the video. Negative pts means a dummy frame.
+ typedef std::function<void(int64_t video_pts, AVRational video_timebase, int64_t audio_pts, AVRational audio_timebase,
+ uint16_t timecode,
+ bmusb::FrameAllocator::Frame video_frame, size_t video_offset, bmusb::VideoFormat video_format,
+ bmusb::FrameAllocator::Frame audio_frame, size_t audio_offset, bmusb::AudioFormat audio_format)>
+ frame_callback_t;
+ void set_frame_callback(frame_callback_t callback)
{
frame_callback = callback;
}
+ void set_frame_callback(bmusb::frame_callback_t callback) override
+ {
+ frame_callback = std::bind(
+ callback,
+ std::placeholders::_5,
+ std::placeholders::_6,
+ std::placeholders::_7,
+ std::placeholders::_8,
+ std::placeholders::_9,
+ std::placeholders::_10,
+ std::placeholders::_11);
+ }
+
+ // FFmpegCapture-specific callback that gives the raw audio.
+ typedef std::function<void(const AVPacket *pkt, const AVRational timebase)> audio_callback_t;
+ void set_audio_callback(audio_callback_t callback)
+ {
+ audio_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<void()> init, std::function<void()> cleanup) override
{
dequeue_init_callback = init;
void configure_card() override;
void start_bm_capture() override;
void stop_dequeue_thread() override;
+ bool get_disconnected() const override { return false; } // We never unplug.
- // TODO: Specify error status through this.
- bool get_disconnected() const override { return false; }
-
- std::map<uint32_t, bmusb::VideoMode> get_available_video_modes() const;
+ std::map<uint32_t, bmusb::VideoMode> get_available_video_modes() const override;
void set_video_mode(uint32_t video_mode_id) override {} // Ignore.
uint32_t get_current_video_mode() const override { return 0; }
+ static constexpr bmusb::PixelFormat PixelFormat_NV12 = static_cast<bmusb::PixelFormat>(100); // In the private range.
std::set<bmusb::PixelFormat> get_available_pixel_formats() const override {
- return std::set<bmusb::PixelFormat>{ bmusb::PixelFormat_8BitRGBA };
+ return std::set<bmusb::PixelFormat>{ bmusb::PixelFormat_8BitBGRA, bmusb::PixelFormat_8BitYCbCrPlanar, PixelFormat_NV12 };
}
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<uint32_t, std::string> get_available_video_inputs() const override {
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 *video_codec_ctx, AVCodecContext *audio_codec_ctx,
+ const std::string &pathname, int video_stream_index, int audio_stream_index,
+ bmusb::FrameAllocator::Frame *audio_frame, bmusb::AudioFormat *audio_format, int64_t *audio_pts, bool *error);
+ void convert_audio(const AVFrame *audio_avframe, bmusb::FrameAllocator::Frame *audio_frame, bmusb::AudioFormat *audio_format);
+
+ bmusb::VideoFormat construct_video_format(const AVFrame *frame, AVRational video_timebase);
+ UniqueFrame make_video_frame(const AVFrame *frame, const std::string &pathname, bool *error);
+
+ static int interrupt_cb_thunk(void *unique);
+ int interrupt_cb();
+ mutable std::mutex filename_mu;
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;
+ std::atomic<bool> should_interrupt{false};
+ bool last_frame_was_connected = true;
bool has_dequeue_callbacks = false;
std::function<void()> dequeue_init_callback = nullptr;
bmusb::FrameAllocator *audio_frame_allocator = nullptr;
std::unique_ptr<bmusb::FrameAllocator> owned_video_frame_allocator;
std::unique_ptr<bmusb::FrameAllocator> owned_audio_frame_allocator;
- bmusb::frame_callback_t frame_callback = nullptr;
+ frame_callback_t frame_callback = nullptr;
+ audio_callback_t audio_callback = nullptr;
- std::atomic<bool> 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, audio_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, last_frame;
+
std::mutex queue_mu;
struct QueuedCommand {
- enum Command { REWIND } command;
+ enum Command { REWIND, CHANGE_RATE } command;
+ double new_rate; // For CHANGE_RATE.
};
std::vector<QueuedCommand> command_queue; // Protected by <queue_mu>.
+
+ // Audio resampler.
+ AVAudioResampleContext *resampler = nullptr;
+ AVSampleFormat last_src_format, last_dst_format;
+ int64_t last_channel_layout;
+ int last_sample_rate;
+
};
#endif // !defined(_FFMPEG_CAPTURE_H)
projects / nageru / blobdiff