| /* |
| * XCB input grabber |
| * Copyright (C) 2014 Luca Barbato <lu_zero@gentoo.org> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "config.h" |
| |
| #include <stdlib.h> |
| #include <string.h> |
| #include <xcb/xcb.h> |
| |
| #if CONFIG_LIBXCB_XFIXES |
| #include <xcb/xfixes.h> |
| #endif |
| |
| #if CONFIG_LIBXCB_SHM |
| #include <sys/shm.h> |
| #include <xcb/shm.h> |
| #endif |
| |
| #if CONFIG_LIBXCB_SHAPE |
| #include <xcb/shape.h> |
| #endif |
| |
| #include "libavutil/internal.h" |
| #include "libavutil/mathematics.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/parseutils.h" |
| #include "libavutil/time.h" |
| |
| #include "libavformat/avformat.h" |
| #include "libavformat/internal.h" |
| |
| typedef struct XCBGrabContext { |
| const AVClass *class; |
| |
| xcb_connection_t *conn; |
| xcb_screen_t *screen; |
| xcb_window_t window; |
| #if CONFIG_LIBXCB_SHM |
| AVBufferPool *shm_pool; |
| #endif |
| int64_t time_frame; |
| AVRational time_base; |
| int64_t frame_duration; |
| |
| int x, y; |
| int width, height; |
| int frame_size; |
| int bpp; |
| |
| int draw_mouse; |
| int follow_mouse; |
| int show_region; |
| int region_border; |
| int centered; |
| int select_region; |
| |
| const char *framerate; |
| |
| int has_shm; |
| } XCBGrabContext; |
| |
| #define FOLLOW_CENTER -1 |
| |
| #define OFFSET(x) offsetof(XCBGrabContext, x) |
| #define D AV_OPT_FLAG_DECODING_PARAM |
| static const AVOption options[] = { |
| { "x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D }, |
| { "y", "Initial y coordinate.", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D }, |
| { "grab_x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D }, |
| { "grab_y", "Initial y coordinate.", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D }, |
| { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL }, 0, 0, D }, |
| { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc" }, 0, 0, D }, |
| { "draw_mouse", "Draw the mouse pointer.", OFFSET(draw_mouse), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, D }, |
| { "follow_mouse", "Move the grabbing region when the mouse pointer reaches within specified amount of pixels to the edge of region.", |
| OFFSET(follow_mouse), AV_OPT_TYPE_INT, { .i64 = 0 }, FOLLOW_CENTER, INT_MAX, D, "follow_mouse" }, |
| { "centered", "Keep the mouse pointer at the center of grabbing region when following.", 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, INT_MIN, INT_MAX, D, "follow_mouse" }, |
| { "show_region", "Show the grabbing region.", OFFSET(show_region), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, D }, |
| { "region_border", "Set the region border thickness.", OFFSET(region_border), AV_OPT_TYPE_INT, { .i64 = 3 }, 1, 128, D }, |
| { "select_region", "Select the grabbing region graphically using the pointer.", OFFSET(select_region), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, D }, |
| { NULL }, |
| }; |
| |
| static const AVClass xcbgrab_class = { |
| .class_name = "xcbgrab indev", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT, |
| }; |
| |
| static int xcbgrab_reposition(AVFormatContext *s, |
| xcb_query_pointer_reply_t *p, |
| xcb_get_geometry_reply_t *geo) |
| { |
| XCBGrabContext *c = s->priv_data; |
| int x = c->x, y = c->y; |
| int w = c->width, h = c->height, f = c->follow_mouse; |
| int p_x, p_y; |
| |
| if (!p || !geo) |
| return AVERROR(EIO); |
| |
| p_x = p->win_x; |
| p_y = p->win_y; |
| |
| if (f == FOLLOW_CENTER) { |
| x = p_x - w / 2; |
| y = p_y - h / 2; |
| } else { |
| int left = x + f; |
| int right = x + w - f; |
| int top = y + f; |
| int bottom = y + h - f; |
| if (p_x > right) { |
| x += p_x - right; |
| } else if (p_x < left) { |
| x -= left - p_x; |
| } |
| if (p_y > bottom) { |
| y += p_y - bottom; |
| } else if (p_y < top) { |
| y -= top - p_y; |
| } |
| } |
| |
| c->x = FFMIN(FFMAX(0, x), geo->width - w); |
| c->y = FFMIN(FFMAX(0, y), geo->height - h); |
| |
| return 0; |
| } |
| |
| static void xcbgrab_image_reply_free(void *opaque, uint8_t *data) |
| { |
| free(opaque); |
| } |
| |
| static int xcbgrab_frame(AVFormatContext *s, AVPacket *pkt) |
| { |
| XCBGrabContext *c = s->priv_data; |
| xcb_get_image_cookie_t iq; |
| xcb_get_image_reply_t *img; |
| xcb_drawable_t drawable = c->screen->root; |
| xcb_generic_error_t *e = NULL; |
| uint8_t *data; |
| int length; |
| |
| iq = xcb_get_image(c->conn, XCB_IMAGE_FORMAT_Z_PIXMAP, drawable, |
| c->x, c->y, c->width, c->height, ~0); |
| |
| img = xcb_get_image_reply(c->conn, iq, &e); |
| |
| if (e) { |
| av_log(s, AV_LOG_ERROR, |
| "Cannot get the image data " |
| "event_error: response_type:%u error_code:%u " |
| "sequence:%u resource_id:%u minor_code:%u major_code:%u.\n", |
| e->response_type, e->error_code, |
| e->sequence, e->resource_id, e->minor_code, e->major_code); |
| free(e); |
| return AVERROR(EACCES); |
| } |
| |
| if (!img) |
| return AVERROR(EAGAIN); |
| |
| data = xcb_get_image_data(img); |
| length = xcb_get_image_data_length(img); |
| |
| av_init_packet(pkt); |
| |
| pkt->buf = av_buffer_create(data, length, xcbgrab_image_reply_free, img, 0); |
| if (!pkt->buf) { |
| free(img); |
| return AVERROR(ENOMEM); |
| } |
| |
| pkt->data = data; |
| pkt->size = length; |
| |
| return 0; |
| } |
| |
| static int64_t wait_frame(AVFormatContext *s, AVPacket *pkt) |
| { |
| XCBGrabContext *c = s->priv_data; |
| int64_t curtime, delay; |
| |
| c->time_frame += c->frame_duration; |
| |
| for (;;) { |
| curtime = av_gettime(); |
| delay = c->time_frame - curtime; |
| if (delay <= 0) |
| break; |
| av_usleep(delay); |
| } |
| |
| return curtime; |
| } |
| |
| #if CONFIG_LIBXCB_SHM |
| static int check_shm(xcb_connection_t *conn) |
| { |
| xcb_shm_query_version_cookie_t cookie = xcb_shm_query_version(conn); |
| xcb_shm_query_version_reply_t *reply; |
| |
| reply = xcb_shm_query_version_reply(conn, cookie, NULL); |
| if (reply) { |
| free(reply); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static void free_shm_buffer(void *opaque, uint8_t *data) |
| { |
| shmdt(data); |
| } |
| |
| static AVBufferRef *allocate_shm_buffer(void *opaque, int size) |
| { |
| xcb_connection_t *conn = opaque; |
| xcb_shm_seg_t segment; |
| AVBufferRef *ref; |
| uint8_t *data; |
| int id; |
| |
| id = shmget(IPC_PRIVATE, size, IPC_CREAT | 0777); |
| if (id == -1) |
| return NULL; |
| |
| segment = xcb_generate_id(conn); |
| xcb_shm_attach(conn, segment, id, 0); |
| data = shmat(id, NULL, 0); |
| shmctl(id, IPC_RMID, 0); |
| if ((intptr_t)data == -1 || !data) |
| return NULL; |
| |
| ref = av_buffer_create(data, size, free_shm_buffer, (void *)(ptrdiff_t)segment, 0); |
| if (!ref) |
| shmdt(data); |
| |
| return ref; |
| } |
| |
| static int xcbgrab_frame_shm(AVFormatContext *s, AVPacket *pkt) |
| { |
| XCBGrabContext *c = s->priv_data; |
| xcb_shm_get_image_cookie_t iq; |
| xcb_shm_get_image_reply_t *img; |
| xcb_drawable_t drawable = c->screen->root; |
| xcb_generic_error_t *e = NULL; |
| AVBufferRef *buf; |
| xcb_shm_seg_t segment; |
| |
| buf = av_buffer_pool_get(c->shm_pool); |
| if (!buf) { |
| av_log(s, AV_LOG_ERROR, "Could not get shared memory buffer.\n"); |
| return AVERROR(ENOMEM); |
| } |
| segment = (xcb_shm_seg_t)av_buffer_pool_buffer_get_opaque(buf); |
| |
| iq = xcb_shm_get_image(c->conn, drawable, |
| c->x, c->y, c->width, c->height, ~0, |
| XCB_IMAGE_FORMAT_Z_PIXMAP, segment, 0); |
| img = xcb_shm_get_image_reply(c->conn, iq, &e); |
| |
| xcb_flush(c->conn); |
| |
| if (e) { |
| av_log(s, AV_LOG_ERROR, |
| "Cannot get the image data " |
| "event_error: response_type:%u error_code:%u " |
| "sequence:%u resource_id:%u minor_code:%u major_code:%u.\n", |
| e->response_type, e->error_code, |
| e->sequence, e->resource_id, e->minor_code, e->major_code); |
| |
| free(e); |
| av_buffer_unref(&buf); |
| return AVERROR(EACCES); |
| } |
| |
| free(img); |
| |
| av_init_packet(pkt); |
| |
| pkt->buf = buf; |
| pkt->data = buf->data; |
| pkt->size = c->frame_size; |
| |
| return 0; |
| } |
| #endif /* CONFIG_LIBXCB_SHM */ |
| |
| #if CONFIG_LIBXCB_XFIXES |
| static int check_xfixes(xcb_connection_t *conn) |
| { |
| xcb_xfixes_query_version_cookie_t cookie; |
| xcb_xfixes_query_version_reply_t *reply; |
| |
| cookie = xcb_xfixes_query_version(conn, XCB_XFIXES_MAJOR_VERSION, |
| XCB_XFIXES_MINOR_VERSION); |
| reply = xcb_xfixes_query_version_reply(conn, cookie, NULL); |
| |
| if (reply) { |
| free(reply); |
| return 1; |
| } |
| return 0; |
| } |
| |
| #define BLEND(target, source, alpha) \ |
| (target) + ((source) * (255 - (alpha)) + 255 / 2) / 255 |
| |
| static void xcbgrab_draw_mouse(AVFormatContext *s, AVPacket *pkt, |
| xcb_query_pointer_reply_t *p, |
| xcb_get_geometry_reply_t *geo) |
| { |
| XCBGrabContext *gr = s->priv_data; |
| uint32_t *cursor; |
| uint8_t *image = pkt->data; |
| int stride = gr->bpp / 8; |
| xcb_xfixes_get_cursor_image_cookie_t cc; |
| xcb_xfixes_get_cursor_image_reply_t *ci; |
| int cx, cy, x, y, w, h, c_off, i_off; |
| |
| cc = xcb_xfixes_get_cursor_image(gr->conn); |
| ci = xcb_xfixes_get_cursor_image_reply(gr->conn, cc, NULL); |
| if (!ci) |
| return; |
| |
| cursor = xcb_xfixes_get_cursor_image_cursor_image(ci); |
| if (!cursor) |
| return; |
| |
| cx = ci->x - ci->xhot; |
| cy = ci->y - ci->yhot; |
| |
| x = FFMAX(cx, gr->x); |
| y = FFMAX(cy, gr->y); |
| |
| w = FFMIN(cx + ci->width, gr->x + gr->width) - x; |
| h = FFMIN(cy + ci->height, gr->y + gr->height) - y; |
| |
| c_off = x - cx; |
| i_off = x - gr->x; |
| |
| cursor += (y - cy) * ci->width; |
| image += (y - gr->y) * gr->width * stride; |
| |
| for (y = 0; y < h; y++) { |
| cursor += c_off; |
| image += i_off * stride; |
| for (x = 0; x < w; x++, cursor++, image += stride) { |
| int r, g, b, a; |
| |
| r = *cursor & 0xff; |
| g = (*cursor >> 8) & 0xff; |
| b = (*cursor >> 16) & 0xff; |
| a = (*cursor >> 24) & 0xff; |
| |
| if (!a) |
| continue; |
| |
| if (a == 255) { |
| image[0] = r; |
| image[1] = g; |
| image[2] = b; |
| } else { |
| image[0] = BLEND(r, image[0], a); |
| image[1] = BLEND(g, image[1], a); |
| image[2] = BLEND(b, image[2], a); |
| } |
| |
| } |
| cursor += ci->width - w - c_off; |
| image += (gr->width - w - i_off) * stride; |
| } |
| |
| free(ci); |
| } |
| #endif /* CONFIG_LIBXCB_XFIXES */ |
| |
| static void xcbgrab_update_region(AVFormatContext *s) |
| { |
| XCBGrabContext *c = s->priv_data; |
| const uint32_t args[] = { c->x - c->region_border, |
| c->y - c->region_border }; |
| |
| xcb_configure_window(c->conn, |
| c->window, |
| XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y, |
| args); |
| } |
| |
| static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| XCBGrabContext *c = s->priv_data; |
| xcb_query_pointer_cookie_t pc; |
| xcb_get_geometry_cookie_t gc; |
| xcb_query_pointer_reply_t *p = NULL; |
| xcb_get_geometry_reply_t *geo = NULL; |
| int ret = 0; |
| int64_t pts; |
| |
| pts = wait_frame(s, pkt); |
| |
| if (c->follow_mouse || c->draw_mouse) { |
| pc = xcb_query_pointer(c->conn, c->screen->root); |
| gc = xcb_get_geometry(c->conn, c->screen->root); |
| p = xcb_query_pointer_reply(c->conn, pc, NULL); |
| if (!p) { |
| av_log(s, AV_LOG_ERROR, "Failed to query xcb pointer\n"); |
| return AVERROR_EXTERNAL; |
| } |
| geo = xcb_get_geometry_reply(c->conn, gc, NULL); |
| if (!geo) { |
| av_log(s, AV_LOG_ERROR, "Failed to get xcb geometry\n"); |
| free(p); |
| return AVERROR_EXTERNAL; |
| } |
| } |
| |
| if (c->follow_mouse && p->same_screen) |
| xcbgrab_reposition(s, p, geo); |
| |
| if (c->show_region) |
| xcbgrab_update_region(s); |
| |
| #if CONFIG_LIBXCB_SHM |
| if (c->has_shm && xcbgrab_frame_shm(s, pkt) < 0) { |
| av_log(s, AV_LOG_WARNING, "Continuing without shared memory.\n"); |
| c->has_shm = 0; |
| } |
| #endif |
| if (!c->has_shm) |
| ret = xcbgrab_frame(s, pkt); |
| pkt->dts = pkt->pts = pts; |
| pkt->duration = c->frame_duration; |
| |
| #if CONFIG_LIBXCB_XFIXES |
| if (ret >= 0 && c->draw_mouse && p->same_screen) |
| xcbgrab_draw_mouse(s, pkt, p, geo); |
| #endif |
| |
| free(p); |
| free(geo); |
| |
| return ret; |
| } |
| |
| static av_cold int xcbgrab_read_close(AVFormatContext *s) |
| { |
| XCBGrabContext *ctx = s->priv_data; |
| |
| #if CONFIG_LIBXCB_SHM |
| av_buffer_pool_uninit(&ctx->shm_pool); |
| #endif |
| |
| xcb_disconnect(ctx->conn); |
| |
| return 0; |
| } |
| |
| static xcb_screen_t *get_screen(const xcb_setup_t *setup, int screen_num) |
| { |
| xcb_screen_iterator_t it = xcb_setup_roots_iterator(setup); |
| xcb_screen_t *screen = NULL; |
| |
| for (; it.rem > 0; xcb_screen_next (&it)) { |
| if (!screen_num) { |
| screen = it.data; |
| break; |
| } |
| |
| screen_num--; |
| } |
| |
| return screen; |
| } |
| |
| static int pixfmt_from_pixmap_format(AVFormatContext *s, int depth, |
| int *pix_fmt, int *bpp) |
| { |
| XCBGrabContext *c = s->priv_data; |
| const xcb_setup_t *setup = xcb_get_setup(c->conn); |
| const xcb_format_t *fmt = xcb_setup_pixmap_formats(setup); |
| int length = xcb_setup_pixmap_formats_length(setup); |
| |
| *pix_fmt = 0; |
| |
| while (length--) { |
| if (fmt->depth == depth) { |
| switch (depth) { |
| case 32: |
| if (fmt->bits_per_pixel == 32) |
| *pix_fmt = AV_PIX_FMT_0RGB; |
| break; |
| case 24: |
| if (fmt->bits_per_pixel == 32) |
| *pix_fmt = AV_PIX_FMT_0RGB32; |
| else if (fmt->bits_per_pixel == 24) |
| *pix_fmt = AV_PIX_FMT_RGB24; |
| break; |
| case 16: |
| if (fmt->bits_per_pixel == 16) |
| *pix_fmt = AV_PIX_FMT_RGB565; |
| break; |
| case 15: |
| if (fmt->bits_per_pixel == 16) |
| *pix_fmt = AV_PIX_FMT_RGB555; |
| break; |
| case 8: |
| if (fmt->bits_per_pixel == 8) |
| *pix_fmt = AV_PIX_FMT_RGB8; |
| break; |
| } |
| } |
| |
| if (*pix_fmt) { |
| *bpp = fmt->bits_per_pixel; |
| return 0; |
| } |
| |
| fmt++; |
| } |
| avpriv_report_missing_feature(s, "Mapping this pixmap format"); |
| |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| 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->screen->root); |
| geo = xcb_get_geometry_reply(c->conn, gc, NULL); |
| if (!geo) |
| 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(); |
| |
| 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; |
| |
| #if CONFIG_LIBXCB_SHM |
| c->shm_pool = av_buffer_pool_init2(c->frame_size + AV_INPUT_BUFFER_PADDING_SIZE, |
| c->conn, allocate_shm_buffer, NULL); |
| if (!c->shm_pool) |
| return AVERROR(ENOMEM); |
| #endif |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO; |
| st->codecpar->width = c->width; |
| st->codecpar->height = c->height; |
| st->codecpar->bit_rate = av_rescale(frame_size_bits, st->avg_frame_rate.num, st->avg_frame_rate.den); |
| |
| return ret; |
| } |
| |
| static void draw_rectangle(AVFormatContext *s) |
| { |
| XCBGrabContext *c = s->priv_data; |
| xcb_gcontext_t gc = xcb_generate_id(c->conn); |
| uint32_t mask = XCB_GC_FOREGROUND | |
| XCB_GC_BACKGROUND | |
| XCB_GC_LINE_WIDTH | |
| XCB_GC_LINE_STYLE | |
| XCB_GC_FILL_STYLE; |
| uint32_t values[] = { c->screen->black_pixel, |
| c->screen->white_pixel, |
| c->region_border, |
| XCB_LINE_STYLE_DOUBLE_DASH, |
| XCB_FILL_STYLE_SOLID }; |
| xcb_rectangle_t r = { 1, 1, |
| c->width + c->region_border * 2 - 3, |
| c->height + c->region_border * 2 - 3 }; |
| |
| xcb_create_gc(c->conn, gc, c->window, mask, values); |
| |
| xcb_poly_rectangle(c->conn, c->window, gc, 1, &r); |
| } |
| |
| static void setup_window(AVFormatContext *s) |
| { |
| XCBGrabContext *c = s->priv_data; |
| uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK; |
| uint32_t values[] = { 1, |
| XCB_EVENT_MASK_EXPOSURE | |
| XCB_EVENT_MASK_STRUCTURE_NOTIFY }; |
| av_unused xcb_rectangle_t rect = { 0, 0, c->width, c->height }; |
| |
| c->window = xcb_generate_id(c->conn); |
| |
| xcb_create_window(c->conn, XCB_COPY_FROM_PARENT, |
| c->window, |
| c->screen->root, |
| c->x - c->region_border, |
| c->y - c->region_border, |
| c->width + c->region_border * 2, |
| c->height + c->region_border * 2, |
| 0, |
| XCB_WINDOW_CLASS_INPUT_OUTPUT, |
| XCB_COPY_FROM_PARENT, |
| mask, values); |
| |
| #if CONFIG_LIBXCB_SHAPE |
| xcb_shape_rectangles(c->conn, XCB_SHAPE_SO_SUBTRACT, |
| XCB_SHAPE_SK_BOUNDING, XCB_CLIP_ORDERING_UNSORTED, |
| c->window, |
| c->region_border, c->region_border, |
| 1, &rect); |
| #endif |
| |
| xcb_map_window(c->conn, c->window); |
| |
| draw_rectangle(s); |
| } |
| |
| #define CROSSHAIR_CURSOR 34 |
| |
| static xcb_rectangle_t rectangle_from_corners(xcb_point_t *corner_a, |
| xcb_point_t *corner_b) |
| { |
| xcb_rectangle_t rectangle; |
| rectangle.x = FFMIN(corner_a->x, corner_b->x); |
| rectangle.y = FFMIN(corner_a->y, corner_b->y); |
| rectangle.width = FFABS(corner_a->x - corner_b->x); |
| rectangle.height = FFABS(corner_a->y - corner_b->y); |
| return rectangle; |
| } |
| |
| static int select_region(AVFormatContext *s) |
| { |
| XCBGrabContext *c = s->priv_data; |
| xcb_connection_t *conn = c->conn; |
| xcb_screen_t *screen = c->screen; |
| |
| int ret = 0, done = 0, was_pressed = 0; |
| xcb_cursor_t cursor; |
| xcb_font_t cursor_font; |
| xcb_point_t press_position; |
| xcb_generic_event_t *event; |
| xcb_rectangle_t rectangle = { 0 }; |
| xcb_grab_pointer_reply_t *reply; |
| xcb_grab_pointer_cookie_t cookie; |
| |
| xcb_window_t root_window = screen->root; |
| xcb_gcontext_t gc = xcb_generate_id(conn); |
| uint32_t mask = XCB_GC_FUNCTION | XCB_GC_SUBWINDOW_MODE; |
| uint32_t values[] = { XCB_GX_INVERT, XCB_SUBWINDOW_MODE_INCLUDE_INFERIORS }; |
| xcb_create_gc(conn, gc, root_window, mask, values); |
| |
| cursor_font = xcb_generate_id(conn); |
| xcb_open_font(conn, cursor_font, strlen("cursor"), "cursor"); |
| cursor = xcb_generate_id(conn); |
| xcb_create_glyph_cursor(conn, cursor, cursor_font, cursor_font, |
| CROSSHAIR_CURSOR, CROSSHAIR_CURSOR + 1, 0, 0, 0, |
| 0xFFFF, 0xFFFF, 0xFFFF); |
| cookie = xcb_grab_pointer(conn, 0, root_window, |
| XCB_EVENT_MASK_BUTTON_PRESS | |
| XCB_EVENT_MASK_BUTTON_RELEASE | |
| XCB_EVENT_MASK_BUTTON_MOTION, |
| XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC, |
| root_window, cursor, XCB_CURRENT_TIME); |
| reply = xcb_grab_pointer_reply(conn, cookie, NULL); |
| if (!reply || reply->status != XCB_GRAB_STATUS_SUCCESS) { |
| av_log(s, AV_LOG_ERROR, |
| "Failed to select region. Could not grab pointer.\n"); |
| ret = AVERROR(EIO); |
| free(reply); |
| goto fail; |
| } |
| free(reply); |
| |
| xcb_grab_server(conn); |
| |
| while (!done && (event = xcb_wait_for_event(conn))) { |
| switch (event->response_type & ~0x80) { |
| case XCB_BUTTON_PRESS: { |
| xcb_button_press_event_t *press = (xcb_button_press_event_t *)event; |
| press_position = (xcb_point_t){ press->event_x, press->event_y }; |
| rectangle.x = press_position.x; |
| rectangle.y = press_position.y; |
| xcb_poly_rectangle(conn, root_window, gc, 1, &rectangle); |
| was_pressed = 1; |
| break; |
| } |
| case XCB_MOTION_NOTIFY: { |
| if (was_pressed) { |
| xcb_motion_notify_event_t *motion = |
| (xcb_motion_notify_event_t *)event; |
| xcb_point_t cursor_position = { motion->event_x, motion->event_y }; |
| xcb_poly_rectangle(conn, root_window, gc, 1, &rectangle); |
| rectangle = rectangle_from_corners(&press_position, &cursor_position); |
| xcb_poly_rectangle(conn, root_window, gc, 1, &rectangle); |
| } |
| break; |
| } |
| case XCB_BUTTON_RELEASE: { |
| xcb_poly_rectangle(conn, root_window, gc, 1, &rectangle); |
| done = 1; |
| break; |
| } |
| default: |
| break; |
| } |
| xcb_flush(conn); |
| free(event); |
| } |
| c->width = rectangle.width; |
| c->height = rectangle.height; |
| if (c->width && c->height) { |
| c->x = rectangle.x; |
| c->y = rectangle.y; |
| } else { |
| c->x = 0; |
| c->y = 0; |
| } |
| xcb_ungrab_server(conn); |
| xcb_ungrab_pointer(conn, XCB_CURRENT_TIME); |
| xcb_flush(conn); |
| |
| fail: |
| xcb_free_cursor(conn, cursor); |
| xcb_close_font(conn, cursor_font); |
| xcb_free_gc(conn, gc); |
| return ret; |
| } |
| |
| static av_cold int xcbgrab_read_header(AVFormatContext *s) |
| { |
| XCBGrabContext *c = s->priv_data; |
| int screen_num, ret; |
| const xcb_setup_t *setup; |
| char *display_name = av_strdup(s->url); |
| |
| if (!display_name) |
| return AVERROR(ENOMEM); |
| |
| if (!sscanf(s->url, "%[^+]+%d,%d", display_name, &c->x, &c->y)) { |
| *display_name = 0; |
| sscanf(s->url, "+%d,%d", &c->x, &c->y); |
| } |
| |
| c->conn = xcb_connect(display_name[0] ? display_name : NULL, &screen_num); |
| av_freep(&display_name); |
| |
| if ((ret = xcb_connection_has_error(c->conn))) { |
| av_log(s, AV_LOG_ERROR, "Cannot open display %s, error %d.\n", |
| s->url[0] ? s->url : "default", ret); |
| return AVERROR(EIO); |
| } |
| |
| setup = xcb_get_setup(c->conn); |
| |
| c->screen = get_screen(setup, screen_num); |
| if (!c->screen) { |
| av_log(s, AV_LOG_ERROR, "The screen %d does not exist.\n", |
| screen_num); |
| xcbgrab_read_close(s); |
| return AVERROR(EIO); |
| } |
| |
| if (c->select_region) { |
| ret = select_region(s); |
| if (ret < 0) { |
| xcbgrab_read_close(s); |
| return ret; |
| } |
| } |
| |
| ret = create_stream(s); |
| |
| if (ret < 0) { |
| xcbgrab_read_close(s); |
| return ret; |
| } |
| |
| #if CONFIG_LIBXCB_SHM |
| c->has_shm = check_shm(c->conn); |
| #endif |
| |
| #if CONFIG_LIBXCB_XFIXES |
| if (c->draw_mouse) { |
| if (!(c->draw_mouse = check_xfixes(c->conn))) { |
| av_log(s, AV_LOG_WARNING, |
| "XFixes not available, cannot draw the mouse.\n"); |
| } |
| if (c->bpp < 24) { |
| avpriv_report_missing_feature(s, "%d bits per pixel screen", |
| c->bpp); |
| c->draw_mouse = 0; |
| } |
| } |
| #endif |
| |
| if (c->show_region) |
| setup_window(s); |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_xcbgrab_demuxer = { |
| .name = "x11grab", |
| .long_name = NULL_IF_CONFIG_SMALL("X11 screen capture, using XCB"), |
| .priv_data_size = sizeof(XCBGrabContext), |
| .read_header = xcbgrab_read_header, |
| .read_packet = xcbgrab_read_packet, |
| .read_close = xcbgrab_read_close, |
| .flags = AVFMT_NOFILE, |
| .priv_class = &xcbgrab_class, |
| }; |