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@@ -49,13 +49,11 @@ |
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typedef struct XCBGrabContext { |
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const AVClass *class; |
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uint8_t *buffer; |
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xcb_connection_t *conn; |
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xcb_screen_t *screen; |
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xcb_window_t window; |
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#if CONFIG_LIBXCB_SHM |
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xcb_shm_seg_t segment; |
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AVBufferPool *shm_pool; |
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#endif |
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int64_t time_frame; |
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AVRational time_base; |
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@@ -231,31 +229,35 @@ static int check_shm(xcb_connection_t *conn) |
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return 0; |
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} |
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static int allocate_shm(AVFormatContext *s) |
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static void free_shm_buffer(void *opaque, uint8_t *data) |
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{ |
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XCBGrabContext *c = s->priv_data; |
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int size = c->frame_size + AV_INPUT_BUFFER_PADDING_SIZE; |
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shmdt(data); |
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} |
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static AVBufferRef *allocate_shm_buffer(void *opaque, int size) |
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{ |
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xcb_connection_t *conn = opaque; |
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xcb_shm_seg_t segment; |
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AVBufferRef *ref; |
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uint8_t *data; |
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int id; |
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if (c->buffer) |
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return 0; |
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id = shmget(IPC_PRIVATE, size, IPC_CREAT | 0777); |
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if (id == -1) { |
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char errbuf[1024]; |
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int err = AVERROR(errno); |
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av_strerror(err, errbuf, sizeof(errbuf)); |
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av_log(s, AV_LOG_ERROR, "Cannot get %d bytes of shared memory: %s.\n", |
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size, errbuf); |
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return err; |
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} |
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xcb_shm_attach(c->conn, c->segment, id, 0); |
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if (id == -1) |
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return NULL; |
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segment = xcb_generate_id(conn); |
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xcb_shm_attach(conn, segment, id, 0); |
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data = shmat(id, NULL, 0); |
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shmctl(id, IPC_RMID, 0); |
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if ((intptr_t)data == -1 || !data) |
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return AVERROR(errno); |
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c->buffer = data; |
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return 0; |
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return NULL; |
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ref = av_buffer_create(data, size, free_shm_buffer, (void *)(ptrdiff_t)segment, 0); |
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if (!ref) |
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shmdt(data); |
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return ref; |
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} |
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static int xcbgrab_frame_shm(AVFormatContext *s, AVPacket *pkt) |
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@@ -265,15 +267,19 @@ static int xcbgrab_frame_shm(AVFormatContext *s, AVPacket *pkt) |
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xcb_shm_get_image_reply_t *img; |
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xcb_drawable_t drawable = c->screen->root; |
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xcb_generic_error_t *e = NULL; |
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int ret; |
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AVBufferRef *buf; |
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xcb_shm_seg_t segment; |
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ret = allocate_shm(s); |
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if (ret < 0) |
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return ret; |
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buf = av_buffer_pool_get(c->shm_pool); |
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if (!buf) { |
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av_log(s, AV_LOG_ERROR, "Could not get shared memory buffer.\n"); |
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return AVERROR(ENOMEM); |
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} |
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segment = (xcb_shm_seg_t)av_buffer_pool_buffer_get_opaque(buf); |
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iq = xcb_shm_get_image(c->conn, drawable, |
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c->x, c->y, c->width, c->height, ~0, |
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XCB_IMAGE_FORMAT_Z_PIXMAP, c->segment, 0); |
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XCB_IMAGE_FORMAT_Z_PIXMAP, segment, 0); |
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img = xcb_shm_get_image_reply(c->conn, iq, &e); |
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xcb_flush(c->conn); |
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@@ -287,12 +293,16 @@ static int xcbgrab_frame_shm(AVFormatContext *s, AVPacket *pkt) |
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e->sequence, e->resource_id, e->minor_code, e->major_code); |
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free(e); |
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av_buffer_unref(&buf); |
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return AVERROR(EACCES); |
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} |
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free(img); |
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pkt->data = c->buffer; |
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av_init_packet(pkt); |
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pkt->buf = buf; |
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pkt->data = buf->data; |
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pkt->size = c->frame_size; |
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return 0; |
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@@ -425,8 +435,10 @@ static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt) |
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xcbgrab_update_region(s); |
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#if CONFIG_LIBXCB_SHM |
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if (c->has_shm && xcbgrab_frame_shm(s, pkt) < 0) |
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if (c->has_shm && xcbgrab_frame_shm(s, pkt) < 0) { |
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av_log(s, AV_LOG_WARNING, "Continuing without shared memory.\n"); |
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c->has_shm = 0; |
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} |
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#endif |
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if (!c->has_shm) |
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ret = xcbgrab_frame(s, pkt); |
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@@ -447,9 +459,7 @@ static av_cold int xcbgrab_read_close(AVFormatContext *s) |
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XCBGrabContext *ctx = s->priv_data; |
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#if CONFIG_LIBXCB_SHM |
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if (ctx->buffer) { |
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shmdt(ctx->buffer); |
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} |
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av_buffer_pool_uninit(&ctx->shm_pool); |
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#endif |
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xcb_disconnect(ctx->conn); |
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@@ -515,6 +525,12 @@ static int pixfmt_from_pixmap_format(AVFormatContext *s, int depth, |
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if (*pix_fmt) { |
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c->bpp = fmt->bits_per_pixel; |
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c->frame_size = c->width * c->height * fmt->bits_per_pixel / 8; |
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#if CONFIG_LIBXCB_SHM |
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c->shm_pool = av_buffer_pool_init2(c->frame_size + AV_INPUT_BUFFER_PADDING_SIZE, |
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c->conn, allocate_shm_buffer, NULL); |
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if (!c->shm_pool) |
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return AVERROR(ENOMEM); |
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#endif |
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return 0; |
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} |
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@@ -680,8 +696,7 @@ static av_cold int xcbgrab_read_header(AVFormatContext *s) |
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} |
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#if CONFIG_LIBXCB_SHM |
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if ((c->has_shm = check_shm(c->conn))) |
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c->segment = xcb_generate_id(c->conn); |
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c->has_shm = check_shm(c->conn); |
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#endif |
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#if CONFIG_LIBXCB_XFIXES |
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