mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
synced 2025-11-01 22:58:50 -04:00
examples: add example of memfd upload
Add an example of a client that allocates the buffer memory and uploads the fds to the server.
This commit is contained in:
Wim Taymans
parent
935de18aa5
commit
b90c5b925a
2 changed files with 416 additions and 0 deletions
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@ -4,6 +4,12 @@ executable('video-src',
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install: false,
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dependencies : [pipewire_dep, mathlib],
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)
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executable('video-src-alloc',
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'video-src-alloc.c',
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c_args : [ '-D_GNU_SOURCE' ],
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install: false,
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dependencies : [pipewire_dep, mathlib],
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)
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executable('audio-src',
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'audio-src.c',
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c_args : [ '-D_GNU_SOURCE' ],
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410
src/examples/video-src-alloc.c
Normal file
410
src/examples/video-src-alloc.c
Normal file
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@ -0,0 +1,410 @@
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/* PipeWire
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*
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* Copyright © 2018 Wim Taymans
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <time.h>
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#include <math.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <spa/param/video/format-utils.h>
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#include <spa/param/props.h>
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#include <pipewire/pipewire.h>
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#define BPP 3
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#define WIDTH 320
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#define HEIGHT 200
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#define CROP 8
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#define CURSOR_WIDTH 64
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#define CURSOR_HEIGHT 64
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#define CURSOR_BPP 4
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#define M_PI_M2 ( M_PI + M_PI )
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struct data {
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struct pw_main_loop *loop;
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struct spa_source *timer;
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struct pw_stream *stream;
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struct spa_hook stream_listener;
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struct spa_video_info_raw format;
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int32_t stride;
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int counter;
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uint32_t seq;
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double crop;
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double accumulator;
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};
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static void draw_elipse(uint32_t *dst, int width, int height, uint32_t color)
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{
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int i, j, r1, r2, r12, r22, r122;
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r1 = width/2;
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r12 = r1 * r1;
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r2 = height/2;
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r22 = r2 * r2;
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r122 = r12 * r22;
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for (i = -r2; i < r2; i++) {
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for (j = -r1; j < r1; j++) {
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dst[(i + r2)*width+(j+r1)] =
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(i * i * r12 + j * j * r22 <= r122) ? color : 0x00000000;
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}
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}
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}
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/* called on timeout and we should push a new buffer in the queue */
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static void on_timeout(void *userdata, uint64_t expirations)
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{
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struct data *data = userdata;
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struct pw_buffer *b;
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struct spa_buffer *buf;
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uint32_t i, j;
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uint8_t *p;
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struct spa_meta *m;
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struct spa_meta_header *h;
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struct spa_meta_region *mc;
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struct spa_meta_cursor *mcs;
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pw_log_trace("timeout");
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if ((b = pw_stream_dequeue_buffer(data->stream)) == NULL) {
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pw_log_warn("out of buffers");
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return;
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}
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buf = b->buffer;
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if ((p = buf->datas[0].data) == NULL)
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return;
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if ((h = spa_buffer_find_meta_data(buf, SPA_META_Header, sizeof(*h)))) {
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#if 0
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struct timespec now;
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clock_gettime(CLOCK_MONOTONIC, &now);
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h->pts = SPA_TIMESPEC_TO_NSEC(&now);
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#else
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h->pts = -1;
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#endif
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h->flags = 0;
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h->seq = data->seq++;
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h->dts_offset = 0;
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}
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if ((m = spa_buffer_find_meta(buf, SPA_META_VideoDamage))) {
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struct spa_meta_region *r = spa_meta_first(m);
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if (spa_meta_check(r, m)) {
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r->region.position = SPA_POINT(0,0);
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r->region.size = data->format.size;
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r++;
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}
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if (spa_meta_check(r, m))
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r->region = SPA_REGION(0,0,0,0);
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}
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if ((mc = spa_buffer_find_meta_data(buf, SPA_META_VideoCrop, sizeof(*mc)))) {
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data->crop = (sin(data->accumulator) + 1.0) * 32.0;
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mc->region.position.x = data->crop;
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mc->region.position.y = data->crop;
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mc->region.size.width = WIDTH - data->crop*2;
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mc->region.size.height = HEIGHT - data->crop*2;
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}
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if ((mcs = spa_buffer_find_meta_data(buf, SPA_META_Cursor, sizeof(*mcs)))) {
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struct spa_meta_bitmap *mb;
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uint32_t *bitmap, color;
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mcs->id = 1;
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mcs->position.x = (sin(data->accumulator) + 1.0) * 160.0 + 80;
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mcs->position.y = (cos(data->accumulator) + 1.0) * 100.0 + 50;
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mcs->hotspot.x = 0;
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mcs->hotspot.y = 0;
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mcs->bitmap_offset = sizeof(struct spa_meta_cursor);
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mb = SPA_MEMBER(mcs, mcs->bitmap_offset, struct spa_meta_bitmap);
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mb->format = SPA_VIDEO_FORMAT_ARGB;
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mb->size.width = CURSOR_WIDTH;
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mb->size.height = CURSOR_HEIGHT;
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mb->stride = CURSOR_WIDTH * CURSOR_BPP;
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mb->offset = sizeof(struct spa_meta_bitmap);
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bitmap = SPA_MEMBER(mb, mb->offset, uint32_t);
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color = (cos(data->accumulator) + 1.0) * (1 << 23);
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color |= 0xff000000;
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draw_elipse(bitmap, mb->size.width, mb->size.height, color);
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}
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for (i = 0; i < data->format.size.height; i++) {
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for (j = 0; j < data->format.size.width * BPP; j++) {
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p[j] = data->counter + j * i;
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}
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p += data->stride;
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data->counter += 13;
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}
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data->accumulator += M_PI_M2 / 50.0;
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if (data->accumulator >= M_PI_M2)
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data->accumulator -= M_PI_M2;
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buf->datas[0].chunk->offset = 0;
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buf->datas[0].chunk->size = data->format.size.height * data->stride;
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buf->datas[0].chunk->stride = data->stride;
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pw_stream_queue_buffer(data->stream, b);
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}
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/* when the stream is STREAMING, start the timer at 40ms intervals
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* to produce and push a frame. In other states we PAUSE the timer. */
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static void on_stream_state_changed(void *_data, enum pw_stream_state old, enum pw_stream_state state,
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const char *error)
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{
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struct data *data = _data;
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printf("stream state: \"%s\"\n", pw_stream_state_as_string(state));
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switch (state) {
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case PW_STREAM_STATE_CONFIGURE:
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printf("node id: %d\n", pw_stream_get_node_id(data->stream));
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break;
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case PW_STREAM_STATE_STREAMING:
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{
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struct timespec timeout, interval;
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timeout.tv_sec = 0;
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timeout.tv_nsec = 1;
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interval.tv_sec = 0;
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interval.tv_nsec = 40 * SPA_NSEC_PER_MSEC;
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pw_loop_update_timer(pw_main_loop_get_loop(data->loop),
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data->timer, &timeout, &interval, false);
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break;
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}
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default:
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pw_loop_update_timer(pw_main_loop_get_loop(data->loop),
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data->timer, NULL, NULL, false);
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break;
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}
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}
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/* we set the PW_STREAM_FLAG_ALLOC_BUFFERS flag when connecting so we need
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* to provide buffer memory. */
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static void on_stream_add_buffer(void *_data, struct pw_buffer *buffer)
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{
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struct data *data = _data;
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struct spa_buffer *buf = buffer->buffer;
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struct spa_data *d;
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unsigned int seals;
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d = buf->datas;
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/* create the memfd on the buffer, set the type and flags */
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d[0].type = SPA_DATA_MemFd;
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d[0].flags = SPA_DATA_FLAG_READWRITE;
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d[0].fd = memfd_create("video-src-memfd", MFD_CLOEXEC | MFD_ALLOW_SEALING);
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if (d[0].fd == -1) {
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pw_log_error("can't create memfd: %m");
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return;
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}
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d[0].mapoffset = 0;
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d[0].maxsize = data->stride * data->format.size.height;
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/* truncate to the right size before we set seals */
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if (ftruncate(d[0].fd, d[0].maxsize) < 0) {
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pw_log_error("can't truncate to %d: %m", d[0].maxsize);
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return;
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}
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/* not enforced yet but server might require SEAL_SHRINK later */
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seals = F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL;
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if (fcntl(d[0].fd, F_ADD_SEALS, seals) == -1) {
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pw_log_warn("Failed to add seals: %m");
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}
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/* now mmap so we can write to it in the process function above */
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d[0].data = mmap(NULL, d[0].maxsize, PROT_READ|PROT_WRITE,
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MAP_SHARED, d[0].fd, d[0].mapoffset);
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if (d[0].data == MAP_FAILED) {
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pw_log_error("can't mmap memory: %m");
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return;
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}
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}
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/* close the memfd we set on the buffers here */
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static void on_stream_remove_buffer(void *_data, struct pw_buffer *buffer)
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{
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struct spa_buffer *buf = buffer->buffer;
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struct spa_data *d;
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d = buf->datas;
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munmap(d[0].data, d[0].maxsize);
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close(d[0].fd);
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}
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/* Be notified when the stream format changes.
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*
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* We are now supposed to call pw_stream_finish_format() with success or
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* failure, depending on if we can support the format. Because we gave
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* a list of supported formats, this should be ok.
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*
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* As part of pw_stream_finish_format() we can provide parameters that
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* will control the buffer memory allocation. This includes the metadata
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* that we would like on our buffer, the size, alignment, etc.
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*/
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static void
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on_stream_format_changed(void *_data, const struct spa_pod *format)
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{
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struct data *data = _data;
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struct pw_stream *stream = data->stream;
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uint8_t params_buffer[1024];
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struct spa_pod_builder b = SPA_POD_BUILDER_INIT(params_buffer, sizeof(params_buffer));
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const struct spa_pod *params[5];
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if (format == NULL) {
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pw_stream_finish_format(stream, 0, NULL, 0);
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return;
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}
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spa_format_video_raw_parse(format, &data->format);
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data->stride = SPA_ROUND_UP_N(data->format.size.width * BPP, 4);
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params[0] = spa_pod_builder_add_object(&b,
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SPA_TYPE_OBJECT_ParamBuffers, SPA_PARAM_Buffers,
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SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(2, 1, 32),
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SPA_PARAM_BUFFERS_blocks, SPA_POD_Int(1),
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SPA_PARAM_BUFFERS_size, SPA_POD_Int(data->stride * data->format.size.height),
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SPA_PARAM_BUFFERS_stride, SPA_POD_Int(data->stride),
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SPA_PARAM_BUFFERS_align, SPA_POD_Int(16));
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params[1] = spa_pod_builder_add_object(&b,
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SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
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SPA_PARAM_META_type, SPA_POD_Id(SPA_META_Header),
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SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_header)));
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params[2] = spa_pod_builder_add_object(&b,
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SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
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SPA_PARAM_META_type, SPA_POD_Id(SPA_META_VideoDamage),
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SPA_PARAM_META_size, SPA_POD_CHOICE_RANGE_Int(
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sizeof(struct spa_meta_region) * 16,
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sizeof(struct spa_meta_region) * 1,
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sizeof(struct spa_meta_region) * 16));
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params[3] = spa_pod_builder_add_object(&b,
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SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
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SPA_PARAM_META_type, SPA_POD_Id(SPA_META_VideoCrop),
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SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_region)));
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#define CURSOR_META_SIZE(w,h) (sizeof(struct spa_meta_cursor) + \
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sizeof(struct spa_meta_bitmap) + w * h * CURSOR_BPP)
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params[4] = spa_pod_builder_add_object(&b,
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SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
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SPA_PARAM_META_type, SPA_POD_Id(SPA_META_Cursor),
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SPA_PARAM_META_size, SPA_POD_Int(
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CURSOR_META_SIZE(CURSOR_WIDTH,CURSOR_HEIGHT)));
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pw_stream_finish_format(stream, 0, params, 5);
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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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.format_changed = on_stream_format_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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int main(int argc, char *argv[])
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{
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struct data data = { 0, };
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const struct spa_pod *params[1];
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uint8_t buffer[1024];
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struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
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pw_init(&argc, &argv);
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/* create a main loop */
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data.loop = pw_main_loop_new(NULL);
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/* create a simple stream, the simple stream manages to core and remote
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* objects for you if you don't need to deal with them
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*
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* We're making a new video provider. We need to set the media-class
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* property.
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*
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* Pass your events and a user_data pointer as the last arguments. This
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* will inform you about the stream state. The most important event
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* you need to listen to is the process event where you need to provide
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* the data.
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*/
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data.stream = pw_stream_new_simple(
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pw_main_loop_get_loop(data.loop),
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"video-src-alloc",
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pw_properties_new(
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PW_KEY_MEDIA_CLASS, "Video/Source",
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NULL),
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&stream_events,
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&data);
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/* make a timer to schedule out frames */
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data.timer = pw_loop_add_timer(pw_main_loop_get_loop(data.loop), on_timeout, &data);
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/* build the extra parameter for the connection. Here we make an
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* EnumFormat parameter which lists the possible formats we can provide.
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* The server will select a format that matches and informs us about this
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* in the stream format_changed event.
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*/
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params[0] = spa_pod_builder_add_object(&b,
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SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
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SPA_FORMAT_mediaType, SPA_POD_Id(SPA_MEDIA_TYPE_video),
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SPA_FORMAT_mediaSubtype, SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw),
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SPA_FORMAT_VIDEO_format, SPA_POD_Id(SPA_VIDEO_FORMAT_RGB),
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SPA_FORMAT_VIDEO_size, SPA_POD_CHOICE_RANGE_Rectangle(
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&SPA_RECTANGLE(320, 240),
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&SPA_RECTANGLE(1, 1),
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&SPA_RECTANGLE(4096, 4096)),
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SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction(&SPA_FRACTION(25, 1)));
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/* now connect the stream, we need a direction (input/output),
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* an optional target node to connect to, some flags and parameters.
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*
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* Here we pass PW_STREAM_FLAG_ALLOC_BUFFERS. We should in the
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* add_buffer callback configure the buffer memory. This should be
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* fd backed memory (memfd, dma-buf, ...) that can be shared with
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* the server. */
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pw_stream_connect(data.stream,
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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_ALLOC_BUFFERS,
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params, 1);
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/* run the loop, this will trigger the callbacks */
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pw_main_loop_run(data.loop);
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pw_stream_destroy(data.stream);
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pw_main_loop_destroy(data.loop);
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return 0;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue