[FFmpeg-devel] [PATCH] avdevice/xcbgrab: enable window resizing
Aline Gondim Santos Gondim Santos
aline.gondimsantos at savoirfairelinux.com
Thu Feb 9 20:29:59 EET 2023
Hello Nicolas,
Bellow you can find the bechmarks using `ffmpeg -benchmark` option.
1 - master
./ffmpeg -benchmark -t 10 -framerate 25 -f x11grab -i ":1+0,0 1920x1080" output1master.mp4
ffmpeg version N-109782-g458ae405ef Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 11 (Ubuntu 11.3.0-1ubuntu1~22.04)
configuration:
libavutil 57. 44.100 / 57. 44.100
libavcodec 59. 63.100 / 59. 63.100
libavformat 59. 38.100 / 59. 38.100
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 56.100 / 8. 56.100
libswscale 6. 8.112 / 6. 8.112
libswresample 4. 9.100 / 4. 9.100
[x11grab @ 0x564d03e165c0] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':1+0,0 1920x1080':
Duration: N/A, start: 1675963927.428661, bitrate: 3379200 kb/s
Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 3520x1200, 3379200 kb/s, 25 fps, 1000k tbr, 1000k tbn
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
Output #0, mp4, to 'output1master.mp4':
Metadata:
encoder : Lavf59.38.100
Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, progressive), 3520x1200, q=2-31, 200 kb/s, 25 fps, 12800 tbn
Metadata:
encoder : Lavc59.63.100 mpeg4
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame= 251 fps= 25 q=31.0 Lsize= 5720kB time=00:00:10.00 bitrate=4686.0kbits/s speed=0.996x
video:5718kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.034719%
bench: utime=13.142s stime=0.307s rtime=10.039s
bench: maxrss=207576kB
2 - master
./ffmpeg -benchmark -t 10 -framerate 25 -f x11grab -window_id 0x5600008 -i ":1+0,0 1920x1080" output2master.mp4
ffmpeg version N-109782-g458ae405ef Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 11 (Ubuntu 11.3.0-1ubuntu1~22.04)
configuration:
libavutil 57. 44.100 / 57. 44.100
libavcodec 59. 63.100 / 59. 63.100
libavformat 59. 38.100 / 59. 38.100
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 56.100 / 8. 56.100
libswscale 6. 8.112 / 6. 8.112
libswresample 4. 9.100 / 4. 9.100
Input #0, x11grab, from ':1+0,0 1920x1080':
Duration: N/A, start: 1675963986.581500, bitrate: 472305 kb/s
Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 841x702, 472305 kb/s, 25 fps, 25 tbr, 1000k tbn
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
Output #0, mp4, to 'output2master.mp4':
Metadata:
encoder : Lavf59.38.100
Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, progressive), 841x702, q=2-31, 200 kb/s, 25 fps, 12800 tbn
Metadata:
encoder : Lavc59.63.100 mpeg4
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame= 250 fps= 25 q=31.0 Lsize= 1274kB time=00:00:09.96 bitrate=1047.9kbits/s speed= 1x
video:1272kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.151768%
bench: utime=0.628s stime=1.465s rtime=9.920s
bench: maxrss=52268kB
3 - patch applied
./ffmpeg -benchmark -t 10 -framerate 25 -f x11grab -i ":1+0,0 1920x1080" output1.mp4
ffmpeg version N-109783-g2352934f8b Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 11 (Ubuntu 11.3.0-1ubuntu1~22.04)
configuration:
libavutil 57. 44.100 / 57. 44.100
libavcodec 59. 63.100 / 59. 63.100
libavformat 59. 38.100 / 59. 38.100
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 56.100 / 8. 56.100
libswscale 6. 8.112 / 6. 8.112
libswresample 4. 9.100 / 4. 9.100
[x11grab @ 0x55e86905b5c0] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':1+0,0 1920x1080':
Duration: N/A, start: 1675964519.431271, bitrate: 3379200 kb/s
Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 3520x1200, 3379200 kb/s, 25 fps, 1000k tbr, 1000k tbn
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
Output #0, mp4, to 'output1.mp4':
Metadata:
encoder : Lavf59.38.100
Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, progressive), 3520x1200, q=2-31, 200 kb/s, 25 fps, 12800 tbn
Metadata:
encoder : Lavc59.63.100 mpeg4
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame= 250 fps= 25 q=31.0 Lsize= 5723kB time=00:00:09.96 bitrate=4706.8kbits/s speed=0.996x
video:5721kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.034227%
bench: utime=14.005s stime=0.168s rtime=9.998s
bench: maxrss=207828kB
4 - patch applied
./ffmpeg -benchmark -t 10 -framerate 25 -f x11grab -window_id 0x5600008 -i ":1+0,0 1920x1080" output2.mp4
ffmpeg version N-109783-g2352934f8b Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 11 (Ubuntu 11.3.0-1ubuntu1~22.04)
configuration:
libavutil 57. 44.100 / 57. 44.100
libavcodec 59. 63.100 / 59. 63.100
libavformat 59. 38.100 / 59. 38.100
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 56.100 / 8. 56.100
libswscale 6. 8.112 / 6. 8.112
libswresample 4. 9.100 / 4. 9.100
Input #0, x11grab, from ':1+0,0 1920x1080':
Duration: N/A, start: 1675964455.191272, bitrate: 472305 kb/s
Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 841x702, 472305 kb/s, 25 fps, 24.83 tbr, 1000k tbn
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
Output #0, mp4, to 'output2.mp4':
Metadata:
encoder : Lavf59.38.100
Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, progressive), 841x702, q=2-31, 200 kb/s, 24.83 fps, 19072 tbn
Metadata:
encoder : Lavc59.63.100 mpeg4
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame= 250 fps= 25 q=31.0 Lsize= 961kB time=00:00:10.02 bitrate= 785.0kbits/s speed=1.01x
video:959kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.199722%
bench: utime=1.624s stime=0.049s rtime=9.920s
bench: maxrss=51996kB
Aline Gondim Santos,
Software Developer - Montreal, QC
Savoir-faire Linux inc.
Contactez moi sur [ https://jami.net/ | Jami ] : agsantos
----- Original Message -----
From: "Aline Gondim Santos Gondim Santos" <aline.gondimsantos at savoirfairelinux.com>
To: "ffmpeg-devel" <ffmpeg-devel at ffmpeg.org>
Cc: "Aline Gondim Santos Gondim Santos" <aline.gondimsantos at savoirfairelinux.com>
Sent: Thursday, 9 February, 2023 15:19:53
Subject: [FFmpeg-devel] [PATCH] avdevice/xcbgrab: enable window resizing
Signed-off-by: Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
---
libavdevice/xcbgrab.c | 180 +++++++++---------------------------------
1 file changed, 39 insertions(+), 141 deletions(-)
diff --git a/libavdevice/xcbgrab.c b/libavdevice/xcbgrab.c
index 64a68ba497..05282911a9 100644
--- a/libavdevice/xcbgrab.c
+++ b/libavdevice/xcbgrab.c
@@ -29,11 +29,6 @@
#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
@@ -53,9 +48,6 @@ typedef struct XCBGrabContext {
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;
@@ -72,10 +64,9 @@ typedef struct XCBGrabContext {
int region_border;
int centered;
int select_region;
+ int is_area;
const char *framerate;
-
- int has_shm;
} XCBGrabContext;
#define FOLLOW_CENTER -1
@@ -97,6 +88,7 @@ static const AVOption options[] = {
{ "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 },
+ { "is_area", "Define if we are grabing a region of the display/window.", OFFSET(is_area), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, D },
{ NULL },
};
@@ -216,99 +208,6 @@ static int64_t wait_frame(AVFormatContext *s, AVPacket *pkt)
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, size_t 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->window_id;
- 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)(uintptr_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);
-
- 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)
{
@@ -462,14 +361,7 @@ static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt)
if (c->show_region)
xcbgrab_update_region(s, win_x, win_y);
-#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);
+ ret = xcbgrab_frame(s, pkt);
pkt->dts = pkt->pts = pts;
pkt->duration = c->frame_duration;
@@ -488,11 +380,8 @@ 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);
+ ctx->conn = NULL;
return 0;
}
@@ -572,7 +461,15 @@ static int pixfmt_from_pixmap_format(AVFormatContext *s, int depth,
static int create_stream(AVFormatContext *s)
{
XCBGrabContext *c = s->priv_data;
- AVStream *st = avformat_new_stream(s, NULL);
+
+ // If we try to open another stream to x11grab, there is no reason
+ // to keep more than one stream in the context.
+ AVStream *st;
+ if (!s->nb_streams) {
+ st = avformat_new_stream(s, NULL);
+ } else {
+ st = s->streams[0];
+ }
xcb_get_geometry_cookie_t gc;
xcb_get_geometry_reply_t *geo;
int64_t frame_size_bits;
@@ -594,7 +491,16 @@ static int create_stream(AVFormatContext *s)
return AVERROR_EXTERNAL;
}
+ // Width and Height are not 0 only when we set a window area to share
+ // This if may be valid only in the first call to create_stream
if (!c->width || !c->height) {
+ c->is_area = 0;
+ c->width = geo->width;
+ c->height = geo->height;
+ }
+ // If not a predefined area, then we should follow geometry changes
+ // This can be valid only on the second call onwards
+ if (!c->is_area && (c->width != geo->width || c->height != geo->height)) {
c->width = geo->width;
c->height = geo->height;
}
@@ -628,13 +534,6 @@ static int create_stream(AVFormatContext *s)
}
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;
@@ -829,23 +728,26 @@ static av_cold int xcbgrab_read_header(AVFormatContext *s)
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 (!c->conn || !c->screen) {
+ xcbgrab_read_close(s);
+ 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);
- }
+ 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);
+ 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);
+ 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->window_id == XCB_NONE)
@@ -876,10 +778,6 @@ static av_cold int xcbgrab_read_header(AVFormatContext *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))) {
--
2.34.1
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