video-pc/AvPlayer2/video_play_thread.cpp

// ***********************************************************/
// video_play_thread.cpp
//
//      Copy Right @ Steven Huang. All rights reserved.
//
// Video play thread. This section includes key code for
// synchronizing video frames and audio using pts/dts,
//  as well as subtitle processing.
// ***********************************************************/

#include "video_play_thread.h"

extern int framedrop;

const QRegularExpression VideoPlayThread::m_assFilter = QRegularExpression("{\\\\.*?}");
const QRegularExpression VideoPlayThread::m_assNewLineReplacer = QRegularExpression("\\\\n|\\\\N");

Q_DECLARE_METATYPE(AVFrame*)

VideoPlayThread::VideoPlayThread(QObject* parent, VideoState* pState)
    : QThread(parent)
    , m_pState(pState)
{
    qRegisterMetaType<AVFrame*>();
}

VideoPlayThread::~VideoPlayThread()
{
    stop_thread();
    final_resample_param();
}

void VideoPlayThread::run()
{
    assert(m_pState);
    VideoState* is = m_pState;
    double remaining_time = 0.0;

    for (;;) {
        if (m_bExitThread)
            break;

        if (is->abort_request)
            break;

        if (is->paused) {
            msleep(10);
            continue;
        }

        if (remaining_time > 0.0)
            av_usleep((int64_t) (remaining_time * 1000000.0));

        remaining_time = REFRESH_RATE;
        if ((!is->paused || is->force_refresh))
            video_refresh(is, &remaining_time);
    }

    qDebug("-------- Video play thread exit.");
}

void VideoPlayThread::video_refresh(VideoState* is, double* remaining_time)
{
    double time;
    Frame *sp, *sp2;

    if (!is->paused && get_master_sync_type(is) == AV_SYNC_EXTERNAL_CLOCK && is->realtime)
        check_external_clock_speed(is);

    if (is->video_st) {
    retry:
        if (frame_queue_nb_remaining(&is->pictq) == 0) {
            // nothing to do, no picture to display in the queue
            *remaining_time = REFRESH_RATE;
        } else {
            double last_duration, duration, delay;
            Frame *vp, *lastvp;

            /* dequeue the picture */
            lastvp = frame_queue_peek_last(&is->pictq);
            vp = frame_queue_peek(&is->pictq);

            if (vp->serial != is->videoq.serial) {
                frame_queue_next(&is->pictq);
                goto retry;
            }

            if (lastvp->serial != vp->serial)
                is->frame_timer = av_gettime_relative() / 1000000.0;

            if (is->paused)
                goto display;

            /* compute nominal last_duration */
            last_duration = vp_duration(is, lastvp, vp);
            delay = compute_target_delay(last_duration, is);

            time = av_gettime_relative() / 1000000.0;
            if (time < is->frame_timer + delay) {
                *remaining_time = FFMIN(is->frame_timer + delay - time, *remaining_time);
                goto display;
            }

            is->frame_timer += delay;
            if (delay > 0 && time - is->frame_timer > AV_SYNC_THRESHOLD_MAX)
                is->frame_timer = time;

            is->pictq.mutex->lock();
            if (!isnan(vp->pts))
                update_video_pts(is, vp->pts, vp->pos, vp->serial);
            is->pictq.mutex->unlock();

            if (frame_queue_nb_remaining(&is->pictq) > 1) {
                Frame* nextvp = frame_queue_peek_next(&is->pictq);
                duration = vp_duration(is, vp, nextvp);
                if (!is->step
                    && (framedrop > 0
                        || (framedrop && get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER))
                    && time > is->frame_timer + duration) {
                    is->frame_drops_late++;
                    frame_queue_next(&is->pictq);
                    goto retry;
                }
            }

            if (is->subtitle_st) {
                while (frame_queue_nb_remaining(&is->subpq) > 0) {
                    sp = frame_queue_peek(&is->subpq);

                    if (frame_queue_nb_remaining(&is->subpq) > 1)
                        sp2 = frame_queue_peek_next(&is->subpq);
                    else
                        sp2 = nullptr;

                    if (sp->serial != is->subtitleq.serial
                        || (is->vidclk.pts > (sp->pts + ((float) sp->sub.end_display_time / 1000)))
                        || (sp2
                            && is->vidclk.pts
                                   > (sp2->pts + ((float) sp2->sub.start_display_time / 1000)))) {
#if 0
						if (sp->uploaded) {
							int i;
							for (i = 0; i < sp->sub.num_rects; i++) {
								AVSubtitleRect* sub_rect = sp->sub.rects[i];

								/*uint8_t* pixels;
								int pitch, j;

								if (!SDL_LockTexture(is->sub_texture, (SDL_Rect*)sub_rect, (void**)&pixels, &pitch)) {
									for (j = 0; j < sub_rect->h; j++, pixels += pitch)
										memset(pixels, 0, sub_rect->w << 2);
									SDL_UnlockTexture(is->sub_texture);
								}*/
							}
						}
#endif
                        frame_queue_next(&is->subpq);
                    } else {
                        break;
                    }
                }
            }

            frame_queue_next(&is->pictq);
            is->force_refresh = 1;

            if (is->step && !is->paused)
                toggle_pause(is, !is->step);
        }

    display:
        /* display picture */
        if (is->force_refresh && is->pictq.rindex_shown)
            video_display(is);
    }

    is->force_refresh = 0;
}

void VideoPlayThread::video_display(VideoState* is)
{
    if (is->audio_st && false) {
        // video_audio_display(is);
    } else if (is->video_st) {
        video_image_display(is);
    }
}

#if 0
void VideoPlayThread::video_audio_display(VideoState* s)
{
	int64_t audio_callback_time = 0;
	int i, i_start, x, y1, y, ys, delay, n, nb_display_channels;
	int ch, channels, h, h2;
	int64_t time_diff;
	int rdft_bits, nb_freq;

	for (rdft_bits = 1; (1 << rdft_bits) < 2 * s->height; rdft_bits++)
		;
	nb_freq = 1 << (rdft_bits - 1);

	/* compute display index : center on currently output samples */
	channels = s->audio_tgt.channels;
	nb_display_channels = channels;
	if (!s->paused) {
		int data_used = (2 * nb_freq);
		n = 2 * channels;
		delay = s->audio_write_buf_size;
		delay /= n;

		/* to be more precise, we take into account the time spent since
		   the last buffer computation */
		if (audio_callback_time) {
			time_diff = av_gettime_relative() - audio_callback_time;
			delay -= (time_diff * s->audio_tgt.freq) / 1000000;
		}

		delay += 2 * data_used;
		if (delay < data_used)
			delay = data_used;

		i_start = x = compute_mod(s->sample_array_index - delay * channels, SAMPLE_ARRAY_SIZE);
		/*if (s->show_mode == SHOW_MODE_WAVES) {
			h = INT_MIN;
			for (i = 0; i < 1000; i += channels) {
				int idx = (SAMPLE_ARRAY_SIZE + x - i) % SAMPLE_ARRAY_SIZE;
				int a = s->sample_array[idx];
				int b = s->sample_array[(idx + 4 * channels) % SAMPLE_ARRAY_SIZE];
				int c = s->sample_array[(idx + 5 * channels) % SAMPLE_ARRAY_SIZE];
				int d = s->sample_array[(idx + 9 * channels) % SAMPLE_ARRAY_SIZE];
				int score = a - d;
				if (h < score && (b ^ c) < 0) {
					h = score;
					i_start = idx;
				}
			}
		}*/

		s->last_i_start = i_start;
	}
	else {
		i_start = s->last_i_start;
	}

#if 0
	if (s->show_mode == SHOW_MODE_WAVES) {
		SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);

		/* total height for one channel */
		h = s->height / nb_display_channels;
		/* graph height / 2 */
		h2 = (h * 9) / 20;
		for (ch = 0; ch < nb_display_channels; ch++) {
			i = i_start + ch;
			y1 = s->ytop + ch * h + (h / 2); /* position of center line */
			for (x = 0; x < s->width; x++) {
				y = (s->sample_array[i] * h2) >> 15;
				if (y < 0) {
					y = -y;
					ys = y1 - y;
				}
				else {
					ys = y1;
				}
				fill_rectangle(s->xleft + x, ys, 1, y);
				i += channels;
				if (i >= SAMPLE_ARRAY_SIZE)
					i -= SAMPLE_ARRAY_SIZE;
			}
		}

		SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);

		for (ch = 1; ch < nb_display_channels; ch++) {
			y = s->ytop + ch * h;
			fill_rectangle(s->xleft, y, s->width, 1);
		}
	}
	else {
		if (realloc_texture(&s->vis_texture, SDL_PIXELFORMAT_ARGB8888, s->width, s->height, SDL_BLENDMODE_NONE, 1) < 0)
			return;

		if (s->xpos >= s->width)
			s->xpos = 0;
		nb_display_channels = FFMIN(nb_display_channels, 2);
		if (rdft_bits != s->rdft_bits) {
			av_rdft_end(s->rdft);
			av_free(s->rdft_data);
			s->rdft = av_rdft_init(rdft_bits, DFT_R2C);
			s->rdft_bits = rdft_bits;
			s->rdft_data = av_malloc_array(nb_freq, 4 * sizeof(*s->rdft_data));
		}
		if (!s->rdft || !s->rdft_data) {
			av_log(nullptr, AV_LOG_ERROR, "Failed to allocate buffers for RDFT, switching to waves display\n");
			s->show_mode = SHOW_MODE_WAVES;
		}
		else {
			FFTSample* data[2];
			SDL_Rect rect = { .x = s->xpos, .y = 0, .w = 1, .h = s->height };
			uint32_t* pixels;
			int pitch;
			for (ch = 0; ch < nb_display_channels; ch++) {
				data[ch] = s->rdft_data + 2 * nb_freq * ch;
				i = i_start + ch;
				for (x = 0; x < 2 * nb_freq; x++) {
					double w = (x - nb_freq) * (1.0 / nb_freq);
					data[ch][x] = s->sample_array[i] * (1.0 - w * w);
					i += channels;
					if (i >= SAMPLE_ARRAY_SIZE)
						i -= SAMPLE_ARRAY_SIZE;
				}
				av_rdft_calc(s->rdft, data[ch]);
			}
			/* Least efficient way to do this, we should of course
			 * directly access it but it is more than fast enough. */
			if (!SDL_LockTexture(s->vis_texture, &rect, (void**)&pixels, &pitch)) {
				pitch >>= 2;
				pixels += pitch * s->height;
				for (y = 0; y < s->height; y++) {
					double w = 1 / sqrt(nb_freq);
					int a = sqrt(w * sqrt(data[0][2 * y + 0] * data[0][2 * y + 0] + data[0][2 * y + 1] * data[0][2 * y + 1]));
					int b = (nb_display_channels == 2) ? sqrt(w * hypot(data[1][2 * y + 0], data[1][2 * y + 1]))
						: a;
					a = FFMIN(a, 255);
					b = FFMIN(b, 255);
					pixels -= pitch;
					*pixels = (a << 16) + (b << 8) + ((a + b) >> 1);
				}
				SDL_UnlockTexture(s->vis_texture);
			}
			SDL_RenderCopy(renderer, s->vis_texture, nullptr, nullptr);
		}
		if (!s->paused)
			s->xpos++;
	}
#endif
}
#endif

void VideoPlayThread::video_image_display(VideoState* is)
{
    Frame* sp = nullptr;
    Frame* vp = frame_queue_peek_last(&is->pictq);
    Video_Resample* pResample = &m_Resample;

    if (frame_queue_nb_remaining(&is->subpq) > 0) {
        sp = frame_queue_peek(&is->subpq);

        if (vp->pts >= sp->pts + ((float) sp->sub.start_display_time / 1000)) {
            if (!sp->uploaded) {
                // uint8_t* pixels[4];
                // int pitch[4];

                if (!sp->width || !sp->height) {
                    sp->width = vp->width;
                    sp->height = vp->height;
                }

                // if (realloc_texture(&is->sub_texture, SDL_PIXELFORMAT_ARGB8888,
                // sp->width, sp->height, SDL_BLENDMODE_BLEND, 1) < 0) 	return;
#if 1
                for (unsigned int i = 0; i < sp->sub.num_rects; i++) {
                    AVSubtitleRect* sub_rect = sp->sub.rects[i];
                    if (sub_rect->type == SUBTITLE_ASS) {
                        qDebug("subtitle[%d], format:%d, type:%d, text:%s, flags:%d",
                               i,
                               sp->sub.format,
                               sub_rect->type,
                               sub_rect->text,
                               sub_rect->flags);
                        // QString ass = QString::fromUtf8(sub_rect->ass);
                        QString ass = QString::fromLocal8Bit(
                            QString::fromStdString(sub_rect->ass).toUtf8());
                        QStringList assList = ass.split(",");
                        if (assList.size() > 8) {
                            ass = assList[8];
                            qDebug("ass: %s", qUtf8Printable(ass));
                            parse_subtitle_ass(ass);
                        }
                    } else {
                        qWarning("not handled yet, type:%d", sub_rect->type);
                    }
                }
#else
                for (i = 0; i < sp->sub.num_rects; i++) {
                    AVSubtitleRect* sub_rect = sp->sub.rects[i];

                    sub_rect->x = av_clip(sub_rect->x, 0, sp->width);
                    sub_rect->y = av_clip(sub_rect->y, 0, sp->height);
                    sub_rect->w = av_clip(sub_rect->w, 0, sp->width - sub_rect->x);
                    sub_rect->h = av_clip(sub_rect->h, 0, sp->height - sub_rect->y);

                    is->sub_convert_ctx = sws_getCachedContext(is->sub_convert_ctx,
                                                               sub_rect->w,
                                                               sub_rect->h,
                                                               AV_PIX_FMT_PAL8,
                                                               sub_rect->w,
                                                               sub_rect->h,
                                                               AV_PIX_FMT_BGRA,
                                                               0,
                                                               nullptr,
                                                               nullptr,
                                                               nullptr);
                    if (!is->sub_convert_ctx) {
                        av_log(nullptr, AV_LOG_FATAL, "Cannot initialize the conversion context\n");
                        return;
                    }
#if 1
                    sws_scale(is->sub_convert_ctx,
                              (const uint8_t* const*) sub_rect->data,
                              sub_rect->linesize,
                              0,
                              sub_rect->h,
                              pixels,
                              pitch);
#else
                    if (!SDL_LockTexture(is->sub_texture,
                                         (SDL_Rect*) sub_rect,
                                         (void**) pixels,
                                         pitch)) {
                        sws_scale(is->sub_convert_ctx,
                                  (const uint8_t* const*) sub_rect->data,
                                  sub_rect->linesize,
                                  0,
                                  sub_rect->h,
                                  pixels,
                                  pitch);
                        SDL_UnlockTexture(is->sub_texture);
                    }
#endif
                }
#endif
                sp->uploaded = 1;
            }
        } else {
            sp = nullptr;
        }
    }

    AVFrame* pFrameRGB = pResample->pFrameRGB; // dst
    AVCodecContext* pVideoCtx = is->viddec.avctx;
    AVFrame* pFrame = vp->frame;

    // AVPixelFormat fmt = (AVPixelFormat)pFrame->format; // 0
    // const char* fmt_name = av_get_pix_fmt_name(fmt);

    // AVHWFramesContext* ctx =
    // (AVHWFramesContext*)pVideoCtx->hw_frames_ctx->data; AVPixelFormat sw_fmt =
    // ctx->sw_format;

    // qDebug("frame w:%d,h:%d, pts:%lld, dts:%lld", pVideoCtx->width,
    // pVideoCtx->height, pFrame->pts, pFrame->pkt_dts);

    // TODO: 不转换
    sws_scale(pResample->sws_ctx,
              (uint8_t const* const*) pFrame->data,
              pFrame->linesize,
              0,
              pVideoCtx->height,
              pFrameRGB->data,
              pFrameRGB->linesize);

    // QImage img(pVideoCtx->width, pVideoCtx->height, QImage::Format_RGB888);
    // for (int y = 0; y < pVideoCtx->height; ++y) {
    //     memcpy(img.scanLine(y),
    //            pFrameRGB->data[0] + y * pFrameRGB->linesize[0],
    //            pVideoCtx->width * 3);
    // }

    // emit frame_ready(img);

    emit frameReady(pFrameRGB);
}

bool VideoPlayThread::init_resample_param(AVCodecContext* pVideo, bool bHardware)
{
    Video_Resample* pResample = &m_Resample;
    if (pVideo) {
        enum AVPixelFormat pix_fmt = pVideo->pix_fmt; // frame format after decode
        if (bHardware)
            pix_fmt = AV_PIX_FMT_NV12;

        struct SwsContext* sws_ctx
            = sws_getContext(pVideo->width,
                             pVideo->height,
                             pix_fmt, // AV_PIX_FMT_YUV420P
                             pVideo->width,
                             pVideo->height,
                             AV_PIX_FMT_RGB24, // sws_scale destination color scheme
                             SWS_BILINEAR,
                             nullptr,
                             nullptr,
                             nullptr);

        AVFrame* pFrameRGB = av_frame_alloc();
        if (!pFrameRGB) {
            printf("Could not allocate rgb frame.\n");
            return false;
        }

        pFrameRGB->width = pVideo->width;
        pFrameRGB->height = pVideo->height;
        pFrameRGB->format = AV_PIX_FMT_RGB24;

        int numBytes = av_image_get_buffer_size(AV_PIX_FMT_RGB24, pVideo->width, pVideo->height, 32);
        uint8_t* const buffer_RGB = (uint8_t*) av_malloc(numBytes * sizeof(uint8_t));
        if (!buffer_RGB) {
            printf("Could not allocate buffer.\n");
            return false;
        }

        av_image_fill_arrays(pFrameRGB->data,
                             pFrameRGB->linesize,
                             buffer_RGB,
                             AV_PIX_FMT_RGB24,
                             pVideo->width,
                             pVideo->height,
                             32);

        pResample->sws_ctx = sws_ctx;
        pResample->pFrameRGB = pFrameRGB;
        pResample->buffer_RGB = buffer_RGB;
        return true;
    }
    return false;
}

void VideoPlayThread::final_resample_param()
{
    Video_Resample* pResample = &m_Resample;
    // Free video resample context
    sws_freeContext(pResample->sws_ctx);

    // Free the RGB image
    av_free(pResample->buffer_RGB);
    av_frame_free(&pResample->pFrameRGB);
    av_free(pResample->pFrameRGB);
}

void VideoPlayThread::stop_thread()
{
    m_bExitThread = true;
    wait();
}

void VideoPlayThread::parse_subtitle_ass(const QString& text)
{
    QString str = text;

    str.remove(m_assFilter);
    str.replace(m_assNewLineReplacer, "\n");
    str = str.trimmed();

    emit subtitle_ready(str);
}