// 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.
+// You can get out the audio either as decoded or in raw form (Kaeru uses this).
#include <assert.h>
#include <stdint.h>
#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.
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;
+ 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 };
+ 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;
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 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);
+ 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;
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;
+
+ 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;
+ std::chrono::steady_clock::time_point start, next_frame_start, last_frame;
std::mutex queue_mu;
struct QueuedCommand {
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)