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screen-cast-stream-src: Support DMA buffer sharing
Implement PipeWire's add_buffer and remove buffer, try and export a DMA buffer first and, on failure, fallback to memfd. When DMA buffers are successfully created and shared, blit the framebuffer contents when drawing instead of downloading the pixels. https://gitlab.gnome.org/GNOME/mutter/merge_requests/1086
This commit is contained in:
Georges Basile Stavracas Neto
parent
d366fb335d
commit
548073ec27
@ -25,6 +25,7 @@
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#include "backends/meta-screen-cast-stream-src.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <pipewire/pipewire.h>
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#include <spa/param/props.h>
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#include <spa/param/format-utils.h>
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@ -90,6 +91,8 @@ typedef struct _MetaScreenCastStreamSrcPrivate
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uint64_t last_frame_timestamp_us;
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GHashTable *dmabuf_handles;
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int stream_width;
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int stream_height;
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} MetaScreenCastStreamSrcPrivate;
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@ -139,6 +142,19 @@ meta_screen_cast_stream_src_record_frame (MetaScreenCastStreamSrc *src,
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return klass->record_frame (src, data);
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}
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static gboolean
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meta_screen_cast_stream_src_blit_to_framebuffer (MetaScreenCastStreamSrc *src,
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CoglFramebuffer *framebuffer)
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{
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MetaScreenCastStreamSrcClass *klass =
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META_SCREEN_CAST_STREAM_SRC_GET_CLASS (src);
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if (klass->blit_to_framebuffer)
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return klass->blit_to_framebuffer (src, framebuffer);
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return FALSE;
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}
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static void
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meta_screen_cast_stream_src_set_cursor_metadata (MetaScreenCastStreamSrc *src,
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struct spa_meta_cursor *spa_meta_cursor)
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@ -394,6 +410,33 @@ maybe_record_cursor (MetaScreenCastStreamSrc *src,
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g_assert_not_reached ();
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}
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static gboolean
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do_record_frame (MetaScreenCastStreamSrc *src,
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struct spa_buffer *spa_buffer,
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uint8_t *data)
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{
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MetaScreenCastStreamSrcPrivate *priv =
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meta_screen_cast_stream_src_get_instance_private (src);
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if (spa_buffer->datas[0].data ||
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spa_buffer->datas[0].type == SPA_DATA_MemFd)
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{
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return meta_screen_cast_stream_src_record_frame (src, data);
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}
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else if (spa_buffer->datas[0].type == SPA_DATA_DmaBuf)
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{
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CoglDmaBufHandle *dmabuf_handle =
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g_hash_table_lookup (priv->dmabuf_handles,
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GINT_TO_POINTER (spa_buffer->datas[0].fd));
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CoglFramebuffer *dmabuf_fbo =
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cogl_dma_buf_handle_get_framebuffer (dmabuf_handle);
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return meta_screen_cast_stream_src_blit_to_framebuffer (src, dmabuf_fbo);
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}
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return FALSE;
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}
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void
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meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src)
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{
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@ -402,8 +445,7 @@ meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src)
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MetaRectangle crop_rect;
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struct pw_buffer *buffer;
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struct spa_buffer *spa_buffer;
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uint8_t *map = NULL;
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uint8_t *data;
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uint8_t *data = NULL;
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uint64_t now_us;
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now_us = g_get_monotonic_time ();
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@ -424,32 +466,15 @@ meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src)
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}
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spa_buffer = buffer->buffer;
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data = spa_buffer->datas[0].data;
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if (spa_buffer->datas[0].data)
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if (spa_buffer->datas[0].type != SPA_DATA_DmaBuf && !data)
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{
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data = spa_buffer->datas[0].data;
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}
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else if (spa_buffer->datas[0].type == SPA_DATA_MemFd)
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{
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map = mmap (NULL, spa_buffer->datas[0].maxsize + spa_buffer->datas[0].mapoffset,
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PROT_READ | PROT_WRITE, MAP_SHARED,
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spa_buffer->datas[0].fd, 0);
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if (map == MAP_FAILED)
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{
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g_warning ("Failed to mmap pipewire stream buffer: %s",
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strerror (errno));
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return;
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}
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data = SPA_MEMBER (map, spa_buffer->datas[0].mapoffset, uint8_t);
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}
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else
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{
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g_warning ("Unhandled spa buffer type: %d", spa_buffer->datas[0].type);
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g_critical ("Invalid buffer data");
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return;
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}
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if (meta_screen_cast_stream_src_record_frame (src, data))
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if (do_record_frame (src, spa_buffer, data))
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{
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struct spa_meta_region *spa_meta_video_crop;
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@ -487,9 +512,6 @@ meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src)
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priv->last_frame_timestamp_us = now_us;
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if (map)
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munmap (map, spa_buffer->datas[0].maxsize + spa_buffer->datas[0].mapoffset);
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pw_stream_queue_buffer (priv->pipewire_stream, buffer);
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}
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@ -618,10 +640,116 @@ on_stream_param_changed (void *data,
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pw_stream_update_params (priv->pipewire_stream, params, G_N_ELEMENTS (params));
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}
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static void
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on_stream_add_buffer (void *data,
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struct pw_buffer *buffer)
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{
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MetaScreenCastStreamSrc *src = data;
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MetaScreenCastStreamSrcPrivate *priv =
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meta_screen_cast_stream_src_get_instance_private (src);
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CoglContext *context =
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clutter_backend_get_cogl_context (clutter_get_default_backend ());
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CoglRenderer *renderer = cogl_context_get_renderer (context);
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g_autoptr (GError) error = NULL;
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CoglDmaBufHandle *dmabuf_handle;
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struct spa_buffer *spa_buffer = buffer->buffer;
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struct spa_data *spa_data = spa_buffer->datas;
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const int bpp = 4;
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int stride;
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stride = SPA_ROUND_UP_N (priv->video_format.size.width * bpp, 4);
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spa_data[0].mapoffset = 0;
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spa_data[0].maxsize = stride * priv->video_format.size.height;
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dmabuf_handle = cogl_renderer_create_dma_buf (renderer,
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priv->stream_width,
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priv->stream_height,
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&error);
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if (error)
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g_debug ("Error exporting DMA buffer handle: %s", error->message);
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if (dmabuf_handle)
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{
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spa_data[0].type = SPA_DATA_DmaBuf;
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spa_data[0].flags = SPA_DATA_FLAG_READWRITE;
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spa_data[0].fd = cogl_dma_buf_handle_get_fd (dmabuf_handle);
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spa_data[0].data = NULL;
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g_hash_table_insert (priv->dmabuf_handles,
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GINT_TO_POINTER (spa_data[0].fd),
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dmabuf_handle);
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}
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else
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{
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unsigned int seals;
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/* Fallback to a memfd buffer */
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spa_data[0].type = SPA_DATA_MemFd;
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spa_data[0].flags = SPA_DATA_FLAG_READWRITE;
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spa_data[0].fd = memfd_create ("mutter-screen-cast-memfd",
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MFD_CLOEXEC | MFD_ALLOW_SEALING);
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if (spa_data[0].fd == -1)
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{
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g_critical ("Can't create memfd: %m");
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return;
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}
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spa_data[0].mapoffset = 0;
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spa_data[0].maxsize = stride * priv->video_format.size.height;
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if (ftruncate (spa_data[0].fd, spa_data[0].maxsize) < 0)
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{
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g_critical ("Can't truncate to %d: %m", spa_data[0].maxsize);
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return;
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}
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seals = F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL;
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if (fcntl (spa_data[0].fd, F_ADD_SEALS, seals) == -1)
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g_warning ("Failed to add seals: %m");
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spa_data[0].data = mmap (NULL,
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spa_data[0].maxsize,
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PROT_READ | PROT_WRITE,
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MAP_SHARED,
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spa_data[0].fd,
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spa_data[0].mapoffset);
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if (spa_data[0].data == MAP_FAILED)
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{
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g_critical ("Failed to mmap memory: %m");
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return;
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}
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}
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}
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static void
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on_stream_remove_buffer (void *data,
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struct pw_buffer *buffer)
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{
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MetaScreenCastStreamSrc *src = data;
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MetaScreenCastStreamSrcPrivate *priv =
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meta_screen_cast_stream_src_get_instance_private (src);
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struct spa_buffer *spa_buffer = buffer->buffer;
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struct spa_data *spa_data = spa_buffer->datas;
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if (spa_data[0].type == SPA_DATA_DmaBuf)
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{
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if (!g_hash_table_remove (priv->dmabuf_handles, GINT_TO_POINTER (spa_data[0].fd)))
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g_critical ("Failed to remove non-exported DMA buffer");
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}
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else if (spa_data[0].type == SPA_DATA_MemFd)
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{
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munmap (spa_data[0].data, spa_data[0].maxsize);
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close (spa_data[0].fd);
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}
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}
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static const struct pw_stream_events stream_events = {
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PW_VERSION_STREAM_EVENTS,
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.state_changed = on_stream_state_changed,
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.param_changed = on_stream_param_changed,
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.add_buffer = on_stream_add_buffer,
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.remove_buffer = on_stream_remove_buffer,
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};
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static struct pw_stream *
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@ -686,7 +814,7 @@ create_pipewire_stream (MetaScreenCastStreamSrc *src,
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PW_DIRECTION_OUTPUT,
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SPA_ID_INVALID,
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(PW_STREAM_FLAG_DRIVER |
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PW_STREAM_FLAG_MAP_BUFFERS),
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PW_STREAM_FLAG_ALLOC_BUFFERS),
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params, G_N_ELEMENTS (params));
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if (result != 0)
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{
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@ -854,6 +982,7 @@ meta_screen_cast_stream_src_finalize (GObject *object)
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if (meta_screen_cast_stream_src_is_enabled (src))
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meta_screen_cast_stream_src_disable (src);
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g_clear_pointer (&priv->dmabuf_handles, g_hash_table_destroy);
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g_clear_pointer (&priv->pipewire_stream, pw_stream_destroy);
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g_clear_pointer (&priv->pipewire_core, pw_core_disconnect);
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g_clear_pointer (&priv->pipewire_context, pw_context_destroy);
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@ -905,6 +1034,12 @@ meta_screen_cast_stream_src_get_property (GObject *object,
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static void
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meta_screen_cast_stream_src_init (MetaScreenCastStreamSrc *src)
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{
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MetaScreenCastStreamSrcPrivate *priv =
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meta_screen_cast_stream_src_get_instance_private (src);
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priv->dmabuf_handles =
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g_hash_table_new_full (NULL, NULL, NULL,
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(GDestroyNotify) cogl_dma_buf_handle_free);
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}
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static void
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@ -55,6 +55,8 @@ struct _MetaScreenCastStreamSrcClass
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void (* disable) (MetaScreenCastStreamSrc *src);
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gboolean (* record_frame) (MetaScreenCastStreamSrc *src,
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uint8_t *data);
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gboolean (* blit_to_framebuffer) (MetaScreenCastStreamSrc *src,
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CoglFramebuffer *framebuffer);
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gboolean (* get_videocrop) (MetaScreenCastStreamSrc *src,
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MetaRectangle *crop_rect);
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void (* set_cursor_metadata) (MetaScreenCastStreamSrc *src,
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