Function create_stream

libavdevice/xcbgrab.c:574–647

}

static int create_stream(AVFormatContext *s)
{
    XCBGrabContext *c = s->priv_data;
    AVStream *st      = avformat_new_stream(s, NULL);
    xcb_get_geometry_cookie_t gc;
    xcb_get_geometry_reply_t *geo;
    int64_t frame_size_bits;
    int ret;

    if (!st)
        return AVERROR(ENOMEM);

    ret = av_parse_video_rate(&st->avg_frame_rate, c->framerate);
    if (ret < 0)
        return ret;

    avpriv_set_pts_info(st, 64, 1, 1000000);

    gc  = xcb_get_geometry(c->conn, c->window_id);
    geo = xcb_get_geometry_reply(c->conn, gc, NULL);
    if (!geo) {
        av_log(s, AV_LOG_ERROR, "Can't find window '0x%x', aborting.\n", c->window_id);
        return AVERROR_EXTERNAL;
    }

    if (!c->width || !c->height) {
        c->width = geo->width;
        c->height = geo->height;
    }

    if (c->x + c->width > geo->width ||
        c->y + c->height > geo->height) {
        av_log(s, AV_LOG_ERROR,
               "Capture area %dx%d at position %d.%d "
               "outside the screen size %dx%d\n",
               c->width, c->height,
               c->x, c->y,
               geo->width, geo->height);
        free(geo);
        return AVERROR(EINVAL);
    }

    c->time_base  = (AVRational){ st->avg_frame_rate.den,
                                  st->avg_frame_rate.num };
    c->frame_duration = av_rescale_q(1, c->time_base, AV_TIME_BASE_Q);
    c->time_frame = av_gettime_relative();

    ret = pixfmt_from_pixmap_format(s, geo->depth, &st->codecpar->format, &c->bpp);
    free(geo);
    if (ret < 0)
        return ret;

    frame_size_bits = (int64_t)c->width * c->height * c->bpp;
    if (frame_size_bits / 8 + AV_INPUT_BUFFER_PADDING_SIZE > INT_MAX) {
        av_log(s, AV_LOG_ERROR, "Captured area is too large\n");
        return AVERROR_PATCHWELCOME;
    }
    c->frame_size = frame_size_bits / 8;