+++ /dev/null
-#ifndef _FFMPEG_CAPTURE_H
-#define _FFMPEG_CAPTURE_H 1
-
-// FFmpegCapture looks much like a capture card, but the frames it spits out
-// come from a video in real time, looping. Because it decodes the video using
-// 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
-// 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,
-// but it would require some more plumbing, and it would also fail if the file
-// changes parameters midway, which is allowed in some formats.
-//
-// You can get out the audio either as decoded or in raw form (Kaeru uses this).
-
-#include <assert.h>
-#include <stdint.h>
-#include <functional>
-#include <map>
-#include <memory>
-#include <mutex>
-#include <set>
-#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
-{
-public:
- FFmpegCapture(const std::string &filename, unsigned width, unsigned height);
- ~FFmpegCapture();
-
- void set_card_index(int card_index)
- {
- this->card_index = card_index;
- }
-
- int get_card_index() const
- {
- return card_index;
- }
-
- void rewind()
- {
- 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.
- void set_video_frame_allocator(bmusb::FrameAllocator *allocator) override
- {
- video_frame_allocator = allocator;
- if (owned_video_frame_allocator.get() != allocator) {
- owned_video_frame_allocator.reset();
- }
- }
-
- bmusb::FrameAllocator *get_video_frame_allocator() override
- {
- return video_frame_allocator;
- }
-
- // Does not take ownership.
- void set_audio_frame_allocator(bmusb::FrameAllocator *allocator) override
- {
- audio_frame_allocator = allocator;
- if (owned_audio_frame_allocator.get() != allocator) {
- owned_audio_frame_allocator.reset();
- }
- }
-
- bmusb::FrameAllocator *get_audio_frame_allocator() override
- {
- return audio_frame_allocator;
- }
-
- // 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;
- dequeue_cleanup_callback = cleanup;
- has_dequeue_callbacks = true;
- }
-
- std::string get_description() const override
- {
- return description;
- }
-
- void configure_card() override;
- void start_bm_capture() override;
- void stop_dequeue_thread() override;
- bool get_disconnected() const override { return false; } // We never unplug.
-
- 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_8BitBGRA, bmusb::PixelFormat_8BitYCbCrPlanar, PixelFormat_NV12 };
- }
- void set_pixel_format(bmusb::PixelFormat pixel_format) override {
- this->pixel_format = pixel_format;
- }
- bmusb::PixelFormat get_current_pixel_format() const override {
- return pixel_format;
- }
-
- std::map<uint32_t, std::string> get_available_video_inputs() const override {
- return { { 0, "Auto" } }; }
- void set_video_input(uint32_t video_input_id) override {} // Ignore.
- uint32_t get_current_video_input() const override { return 0; }
-
- std::map<uint32_t, std::string> get_available_audio_inputs() const override {
- return { { 0, "Embedded" } };
- }
- void set_audio_input(uint32_t audio_input_id) override {} // Ignore.
- uint32_t get_current_audio_input() const override { return 0; }
-
-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;
- std::function<void()> dequeue_cleanup_callback = nullptr;
-
- bmusb::FrameAllocator *video_frame_allocator = 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;
- frame_callback_t frame_callback = nullptr;
- audio_callback_t audio_callback = nullptr;
-
- 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, 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