video-pc/AvPlayer2/packets_sync.h

#pragma once

#include <QMutex>
#include <QThread>
#include <QWaitCondition>

// only need to open audio filter, video will be synced
#define USE_AVFILTER_AUDIO 1
#define USE_AVFILTER_VIDEO 0

extern "C" {
#include <libavcodec/avcodec.h>
#include <libavcodec/avfft.h>
#include <libavformat/avformat.h>
#include <libavutil/bprint.h>
#include <libavutil/fifo.h>
#include <libavutil/imgutils.h>
#include <libavutil/samplefmt.h>
#include <libavutil/time.h>
#include <libswresample/swresample.h>
#include <libswscale/swscale.h>

#if USE_AVFILTER_AUDIO
#include <libavfilter/avfilter.h>
#include <libavfilter/buffersink.h>
#include <libavfilter/buffersrc.h>
#include <libavutil/avstring.h>
#include <libavutil/macros.h>
#include <libavutil/opt.h>
#endif
}

#define MAX_QUEUE_SIZE (15 * 1024 * 1024)
#define MIN_FRAMES 25
#define EXTERNAL_CLOCK_MIN_FRAMES 2
#define EXTERNAL_CLOCK_MAX_FRAMES 10

#define SDL_MIX_MAXVOLUME 128
/* Minimum SDL audio buffer size, in samples. */
#define SDL_AUDIO_MIN_BUFFER_SIZE 512
/* Calculate actual buffer size keeping in mind not cause too frequent audio
 * callbacks */
#define SDL_AUDIO_MAX_CALLBACKS_PER_SEC 30

/* Step size for volume control in dB */
#define SDL_VOLUME_STEP (0.75)

/* no AV sync correction is done if below the minimum AV sync threshold */
#define AV_SYNC_THRESHOLD_MIN 0.04
/* AV sync correction is done if above the maximum AV sync threshold */
#define AV_SYNC_THRESHOLD_MAX 0.1
/* If a frame duration is longer than this, it will not be duplicated to
 * compensate AV sync */
#define AV_SYNC_FRAMEDUP_THRESHOLD 0.1
/* no AV correction is done if too big error */
#define AV_NOSYNC_THRESHOLD 10.0

/* maximum audio speed change to get correct sync */
#define SAMPLE_CORRECTION_PERCENT_MAX 10

/* external clock speed adjustment constants for realtime sources based on
 * buffer fullness */
#define EXTERNAL_CLOCK_SPEED_MIN 0.900
#define EXTERNAL_CLOCK_SPEED_MAX 1.010
#define EXTERNAL_CLOCK_SPEED_STEP 0.001

/* we use about AUDIO_DIFF_AVG_NB A-V differences to make the average */
#define AUDIO_DIFF_AVG_NB 20

/* polls for possible required screen refresh at least this often, should be
 * less than 1/fps */
#define REFRESH_RATE 0.01

/* NOTE: the size must be big enough to compensate the hardware audio buffersize
 * size */
/* TODO: We assume that a decoded and resampled frame fits into this buffer */
#define SAMPLE_ARRAY_SIZE (8 * 65536)

#define CURSOR_HIDE_DELAY 1000000

#define USE_ONEPASS_SUBTITLE_RENDER 1

typedef struct MyAVPacketList
{
    AVPacket* pkt;
    int serial;
} MyAVPacketList;

typedef struct PacketQueue
{
    AVFifo* pkt_list;
    int nb_packets;
    int size;
    int64_t duration;
    int abort_request;
    int serial;
    QMutex* mutex;
    QWaitCondition* cond;
} PacketQueue;

#define VIDEO_PICTURE_QUEUE_SIZE 3
#define SUBPICTURE_QUEUE_SIZE 16
#define SAMPLE_QUEUE_SIZE 20
#define FRAME_QUEUE_SIZE \
    FFMAX(SAMPLE_QUEUE_SIZE, FFMAX(VIDEO_PICTURE_QUEUE_SIZE, SUBPICTURE_QUEUE_SIZE))

typedef struct AudioParams
{
    int freq;
    AVChannelLayout ch_layout;
    enum AVSampleFormat fmt;
    int frame_size;
    int bytes_per_sec;
} AudioParams;

typedef struct Clock
{
    double pts;       /* clock base */
    double pts_drift; /* clock base minus time at which we updated the clock */
    double last_updated;
    double speed;
    int serial; /* clock is based on a packet with this serial */
    int paused;
    int* queue_serial; /* pointer to the current packet queue serial, used for
                        obsolete clock detection */
} Clock;

typedef struct FrameData
{
    int64_t pkt_pos;
} FrameData;

/* Common struct for handling all types of decoded data and allocated render
 * buffers. */
typedef struct Frame
{
    AVFrame* frame;
    AVSubtitle sub;
    int serial;
    double pts;      /* presentation timestamp for the frame */
    double duration; /* estimated duration of the frame */
    int64_t pos;     /* byte position of the frame in the input file */
    int width;
    int height;
    int format;
    AVRational sar;
    int uploaded;
    int flip_v;
} Frame;

typedef struct FrameQueue
{
    Frame queue[FRAME_QUEUE_SIZE]; // array queue model, loop queue
    int rindex;                    // read pointer
    int windex;                    // write pointer
    int size;                      // current frame num
    int max_size;                  // max frame num
    int keep_last;                 // keep last frame
    int rindex_shown;              // current frame is shown
    QMutex* mutex;
    QWaitCondition* cond;
    PacketQueue* pktq;
} FrameQueue;

enum {
    AV_SYNC_AUDIO_MASTER, /* default choice */
    AV_SYNC_VIDEO_MASTER,
    AV_SYNC_EXTERNAL_CLOCK, /* synchronize to an external clock */
};

typedef struct Decoder
{
    AVPacket* pkt;
    PacketQueue* queue;
    AVCodecContext* avctx;
    int pkt_serial;
    int finished;
    int packet_pending;
    QWaitCondition* empty_queue_cond; // SDL_cond* empty_queue_cond;
    int64_t start_pts;
    AVRational start_pts_tb;
    int64_t next_pts;
    AVRational next_pts_tb;
    // SDL_Thread* decoder_tid;
    void* decoder_tid; // thread pointer
    char* decoder_name;
} Decoder;

typedef struct Threads
{
    QThread* read_tid{nullptr};
    QThread* video_decode_tid{nullptr};
    QThread* audio_decode_tid{nullptr};
    QThread* video_play_tid{nullptr};
    QThread* audio_play_tid{nullptr};
    QThread* subtitle_decode_tid{nullptr};
} Threads;

typedef struct VideoState
{
    const AVInputFormat* iformat;
    int abort_request;
    int force_refresh;
    int paused;
    int last_paused;
    int queue_attachments_req;
    int seek_req;
    int seek_flags;
    int64_t seek_pos;
    int64_t seek_rel;
    int read_pause_return;
    AVFormatContext* ic;
    int realtime;

    Clock vidclk;
    Clock audclk;
    Clock extclk;

    PacketQueue videoq;
    PacketQueue audioq;
    PacketQueue subtitleq;

    FrameQueue pictq;
    FrameQueue sampq;
    FrameQueue subpq;

    Decoder viddec;
    Decoder auddec;
    Decoder subdec;

    int audio_stream;
    int av_sync_type;

    double audio_clock;
    int audio_clock_serial;

    double audio_clock_old; // add for renew clock after speed changing

    AVStream* audio_st;

    int audio_volume;
    int muted;

    int frame_drops_early;
    int frame_drops_late;

#if 0
	double audio_diff_avg_coef;
	int audio_diff_avg_count;
	double audio_diff_cum; /* used for AV difference average computation */
	double audio_diff_threshold;

	int16_t sample_array[SAMPLE_ARRAY_SIZE];
	int sample_array_index;

	uint8_t* audio_buf;
	uint8_t* audio_buf1;
	unsigned int audio_buf_size; /* in bytes */
	unsigned int audio_buf1_size;
	int audio_buf_index; /* in bytes */
	int audio_write_buf_size;

	int audio_hw_buf_size;

	struct SwrContext* swr_ctx;

	enum ShowMode {
		SHOW_MODE_NONE = -1, SHOW_MODE_VIDEO = 0, SHOW_MODE_WAVES, SHOW_MODE_RDFT, SHOW_MODE_NB
	} show_mode;
#endif

    int last_i_start;
    // RDFTContext* rdft;
    int rdft_bits;
    // FFTSample* rdft_data;
    int xpos;
    double last_vis_time;
    // SDL_Texture* vis_texture;
    // SDL_Texture* sub_texture;
    // SDL_Texture* vid_texture;

    int subtitle_stream;
    AVStream* subtitle_st;

    double frame_timer;
    double frame_last_returned_time;
    double frame_last_filter_delay;
    int video_stream;
    AVStream* video_st;

    double max_frame_duration; // maximum duration of a frame - above this, we
                               // consider the jump a timestamp discontinuity
    struct SwsContext* img_convert_ctx;
    struct SwsContext* sub_convert_ctx;
    int eof;
    int loop;

    char* filename;
    int width, height, xleft, ytop;
    int step;

#if USE_AVFILTER_AUDIO
    struct AudioParams audio_src;
    struct AudioParams audio_tgt;

    double audio_speed;
    char* afilters;
    int req_afilter_reconfigure;
    char* vfilters;
    int req_vfilter_reconfigure;

    struct AudioParams audio_filter_src;
    int vfilter_idx;
    AVFilterContext* in_video_filter;  // the first filter in the video chain
    AVFilterContext* out_video_filter; // the last filter in the video chain
    AVFilterContext* in_audio_filter;  // the first filter in the audio chain
    AVFilterContext* out_audio_filter; // the last filter in the audio chain
    AVFilterGraph* agraph;
    AVFilterGraph* vgraph;
#endif

    int last_video_stream, last_audio_stream, last_subtitle_stream;

    QWaitCondition* continue_read_thread;
    int read_thread_exit;
    // void* read_tid; //read thread pointer

    Threads threads; // all thread would access VideoState
} VideoState;

#if !NDEBUG
#define PRINT_PACKETQUEUE_INFO 0
#define PRINT_PACKETQUEUE_AUDIO_INFO 0
#else
#define PRINT_PACKETQUEUE_INFO 0
#define PRINT_PACKETQUEUE_AUDIO_INFO 0
#endif

/***************PacketQueue operations*****************/
int packet_queue_init(PacketQueue* q);
void packet_queue_destroy(PacketQueue* q);
void packet_queue_flush(PacketQueue* q);
void packet_queue_start(PacketQueue* q);
void packet_queue_abort(PacketQueue* q);
int packet_queue_get(PacketQueue* q, AVPacket* pkt, int block, int* serial);
int packet_queue_put(PacketQueue* q, AVPacket* pkt);
int packet_queue_put_nullpacket(PacketQueue* q, AVPacket* pkt, int stream_index);
int packet_queue_put_private(PacketQueue* q, AVPacket* pkt);
void packet_queue_print(const PacketQueue* q, const AVPacket* pkt, const QString& prefix);

/***************FrameQueue operations*****************/
int frame_queue_init(FrameQueue* f, PacketQueue* pktq, int max_size, int keep_last);
void frame_queue_destory(FrameQueue* f);
void frame_queue_unref_item(Frame* vp);
void frame_queue_signal(FrameQueue* f);
Frame* frame_queue_peek_writable(FrameQueue* f);
Frame* frame_queue_peek(FrameQueue* f);
Frame* frame_queue_peek_next(FrameQueue* f);
Frame* frame_queue_peek_last(FrameQueue* f);
Frame* frame_queue_peek_readable(FrameQueue* f);
void frame_queue_push(FrameQueue* f);
void frame_queue_next(FrameQueue* f);
int frame_queue_nb_remaining(FrameQueue* f);
int64_t frame_queue_last_pos(FrameQueue* f);

int queue_picture(
    VideoState* is, AVFrame* src_frame, double pts, double duration, int64_t pos, int serial);
int get_video_frame(VideoState* is, AVFrame* frame);

/***************Decoder operations*****************/
int decoder_init(Decoder* d,
                 AVCodecContext* avctx,
                 PacketQueue* queue,
                 QWaitCondition* empty_queue_cond);
int decoder_decode_frame(Decoder* d, AVFrame* frame, AVSubtitle* sub);
void decoder_destroy(Decoder* d);
int decoder_start(Decoder* d, void* thread, const char* thread_name);
void decoder_abort(Decoder* d, FrameQueue* fq);
void get_file_info(const char* filename, int64_t& duration);
void get_duration_time(
    const int64_t duration_us, int64_t& hours, int64_t& mins, int64_t& secs, int64_t& us);

/***************Clock operations*****************/
double get_clock(Clock* c);
void set_clock_at(Clock* c, double pts, int serial, double time);
void set_clock(Clock* c, double pts, int serial);
void set_clock_speed(Clock* c, double speed);
void init_clock(Clock* c, int* queue_serial);
void sync_clock_to_slave(Clock* c, Clock* slave);

/***************VideoState operations*****************/
int get_master_sync_type(VideoState* is);
double get_master_clock(VideoState* is);
void check_external_clock_speed(VideoState* is);
void stream_seek(VideoState* is, int64_t pos, int64_t rel, int seek_by_bytes);
// void stream_toggle_pause(VideoState* is, bool pause = true);
void toggle_pause(VideoState* is, bool pause = true);
void toggle_mute(VideoState* is, bool mute = true);
void update_volume(VideoState* is, int sign, double step);
void step_to_next_frame(VideoState* is);
double compute_target_delay(double delay, VideoState* is);
double vp_duration(VideoState* is, Frame* vp, Frame* nextvp);
void update_video_pts(VideoState* is, double pts, int64_t pos, int serial);

#if PRINT_PACKETQUEUE_INFO
void print_state_info(VideoState* is);
#endif

/****************************************/
int is_realtime(AVFormatContext* s);
int stream_has_enough_packets(AVStream* st, int stream_id, PacketQueue* queue);

#if USE_AVFILTER_AUDIO
void set_audio_playspeed(VideoState* is, double value);

int cmp_audio_fmts(enum AVSampleFormat fmt1,
                   int64_t channel_count1,
                   enum AVSampleFormat fmt2,
                   int64_t channel_count2);
// int64_t get_valid_channel_layout(int64_t channel_layout, int channels);

int configure_audio_filters(VideoState* is, const char* afilters, int force_output_format);
int configure_filtergraph(AVFilterGraph* graph,
                          const char* filtergraph,
                          AVFilterContext* source_ctx,
                          AVFilterContext* sink_ctx);

// int audio_open(void* opaque, int64_t wanted_channel_layout, int
// wanted_nb_channels, int wanted_sample_rate, struct AudioParams*
// audio_hw_params);

void set_video_playspeed(VideoState* is);
int configure_video_filters(AVFilterGraph* graph,
                            VideoState* is,
                            const char* vfilters,
                            AVFrame* frame);
#endif