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-rw-r--r--src/examples/video-play-reneg.c438
1 files changed, 438 insertions, 0 deletions
diff --git a/src/examples/video-play-reneg.c b/src/examples/video-play-reneg.c
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+++ b/src/examples/video-play-reneg.c
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+/* PipeWire
+ *
+ * Copyright © 2020 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ [title]
+ Video input stream using \ref pw_stream "pw_stream", with format renegotiation.
+ [title]
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include <spa/utils/result.h>
+#include <spa/param/video/format-utils.h>
+#include <spa/param/props.h>
+#include <spa/debug/format.h>
+
+#include <pipewire/pipewire.h>
+
+#define WIDTH 640
+#define HEIGHT 480
+
+#define MAX_BUFFERS 64
+
+#include "sdl.h"
+
+struct pixel {
+ float r, g, b, a;
+};
+
+struct data {
+ const char *path;
+
+ SDL_Renderer *renderer;
+ SDL_Window *window;
+ SDL_Texture *texture;
+ SDL_Texture *cursor;
+
+ struct pw_main_loop *loop;
+ struct spa_source *timer;
+
+ struct pw_stream *stream;
+ struct spa_hook stream_listener;
+
+ struct spa_video_info format;
+ int32_t stride;
+ struct spa_rectangle size;
+
+ int counter;
+};
+
+static void handle_events(struct data *data)
+{
+ SDL_Event event;
+ while (SDL_PollEvent(&event)) {
+ switch (event.type) {
+ case SDL_QUIT:
+ pw_main_loop_quit(data->loop);
+ break;
+ }
+ }
+}
+
+/* our data processing function is in general:
+ *
+ * struct pw_buffer *b;
+ * b = pw_stream_dequeue_buffer(stream);
+ *
+ * .. do stuff with buffer ...
+ *
+ * pw_stream_queue_buffer(stream, b);
+ */
+static void
+on_process(void *_data)
+{
+ struct data *data = _data;
+ struct pw_stream *stream = data->stream;
+ struct pw_buffer *b;
+ struct spa_buffer *buf;
+ void *sdata, *ddata;
+ int sstride, dstride, ostride;
+ uint32_t i;
+ uint8_t *src, *dst;
+
+ b = NULL;
+ /* dequeue and queue old buffers, use the last available
+ * buffer */
+ while (true) {
+ struct pw_buffer *t;
+ if ((t = pw_stream_dequeue_buffer(stream)) == NULL)
+ break;
+ if (b)
+ pw_stream_queue_buffer(stream, b);
+ b = t;
+ }
+ if (b == NULL) {
+ pw_log_warn("out of buffers: %m");
+ return;
+ }
+
+ buf = b->buffer;
+
+ pw_log_info("new buffer %p", buf);
+
+ handle_events(data);
+
+ if ((sdata = buf->datas[0].data) == NULL)
+ goto done;
+
+ if (SDL_LockTexture(data->texture, NULL, &ddata, &dstride) < 0) {
+ fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
+ goto done;
+ }
+
+ /* copy video image in texture */
+ sstride = buf->datas[0].chunk->stride;
+ if (sstride == 0)
+ sstride = buf->datas[0].chunk->size / data->size.height;
+ ostride = SPA_MIN(sstride, dstride);
+
+ src = sdata;
+ dst = ddata;
+
+ for (i = 0; i < data->size.height; i++) {
+ memcpy(dst, src, ostride);
+ src += sstride;
+ dst += dstride;
+ }
+ SDL_UnlockTexture(data->texture);
+
+ SDL_RenderClear(data->renderer);
+ /* now render the video */
+ SDL_RenderCopy(data->renderer, data->texture, NULL, NULL);
+ SDL_RenderPresent(data->renderer);
+
+ done:
+ pw_stream_queue_buffer(stream, b);
+}
+
+static void on_stream_state_changed(void *_data, enum pw_stream_state old,
+ enum pw_stream_state state, const char *error)
+{
+ struct data *data = _data;
+ fprintf(stderr, "stream state: \"%s\"\n", pw_stream_state_as_string(state));
+ switch (state) {
+ case PW_STREAM_STATE_UNCONNECTED:
+ pw_main_loop_quit(data->loop);
+ break;
+ case PW_STREAM_STATE_PAUSED:
+ pw_loop_update_timer(pw_main_loop_get_loop(data->loop),
+ data->timer, NULL, NULL, false);
+ break;
+ case PW_STREAM_STATE_STREAMING:
+ {
+ struct timespec timeout, interval;
+
+ timeout.tv_sec = 1;
+ timeout.tv_nsec = 0;
+ interval.tv_sec = 1;
+ interval.tv_nsec = 0;
+
+ pw_loop_update_timer(pw_main_loop_get_loop(data->loop),
+ data->timer, &timeout, &interval, false);
+ break;
+ }
+ default:
+ break;
+ }
+}
+
+/* Be notified when the stream param changes. We're only looking at the
+ * format changes.
+ *
+ * We are now supposed to call pw_stream_finish_format() with success or
+ * failure, depending on if we can support the format. Because we gave
+ * a list of supported formats, this should be ok.
+ *
+ * As part of pw_stream_finish_format() we can provide parameters that
+ * will control the buffer memory allocation. This includes the metadata
+ * that we would like on our buffer, the size, alignment, etc.
+ */
+static void
+on_stream_param_changed(void *_data, uint32_t id, const struct spa_pod *param)
+{
+ struct data *data = _data;
+ struct pw_stream *stream = data->stream;
+ uint8_t params_buffer[1024];
+ struct spa_pod_builder b = SPA_POD_BUILDER_INIT(params_buffer, sizeof(params_buffer));
+ const struct spa_pod *params[1];
+ Uint32 sdl_format;
+ void *d;
+
+ /* NULL means to clear the format */
+ if (param == NULL || id != SPA_PARAM_Format)
+ return;
+
+ fprintf(stderr, "got format:\n");
+ spa_debug_format(2, NULL, param);
+
+ if (spa_format_parse(param, &data->format.media_type, &data->format.media_subtype) < 0)
+ return;
+
+ if (data->format.media_type != SPA_MEDIA_TYPE_video ||
+ data->format.media_subtype != SPA_MEDIA_SUBTYPE_raw)
+ return;
+
+ /* call a helper function to parse the format for us. */
+ spa_format_video_raw_parse(param, &data->format.info.raw);
+ sdl_format = id_to_sdl_format(data->format.info.raw.format);
+ data->size = data->format.info.raw.size;
+
+ if (sdl_format == SDL_PIXELFORMAT_UNKNOWN) {
+ pw_stream_set_error(stream, -EINVAL, "unknown pixel format");
+ return;
+ }
+ if (data->size.width == 0 || data->size.height == 0) {
+ pw_stream_set_error(stream, -EINVAL, "invalid size");
+ return;
+ }
+
+ data->texture = SDL_CreateTexture(data->renderer,
+ sdl_format,
+ SDL_TEXTUREACCESS_STREAMING,
+ data->size.width,
+ data->size.height);
+ SDL_LockTexture(data->texture, NULL, &d, &data->stride);
+ SDL_UnlockTexture(data->texture);
+
+ /* a SPA_TYPE_OBJECT_ParamBuffers object defines the acceptable size,
+ * number, stride etc of the buffers */
+ params[0] = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_ParamBuffers, SPA_PARAM_Buffers,
+ SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(8, 2, MAX_BUFFERS),
+ SPA_PARAM_BUFFERS_blocks, SPA_POD_Int(1),
+ SPA_PARAM_BUFFERS_size, SPA_POD_Int(data->stride * data->size.height),
+ SPA_PARAM_BUFFERS_stride, SPA_POD_Int(data->stride),
+ SPA_PARAM_BUFFERS_dataType, SPA_POD_CHOICE_FLAGS_Int((1<<SPA_DATA_MemPtr)));
+
+ /* we are done */
+ pw_stream_update_params(stream, params, 1);
+}
+
+/* these are the stream events we listen for */
+static const struct pw_stream_events stream_events = {
+ PW_VERSION_STREAM_EVENTS,
+ .state_changed = on_stream_state_changed,
+ .param_changed = on_stream_param_changed,
+ .process = on_process,
+};
+
+static int build_format(struct data *data, struct spa_pod_builder *b, const struct spa_pod **params)
+{
+ SDL_RendererInfo info;
+
+ SDL_GetRendererInfo(data->renderer, &info);
+ params[0] = sdl_build_formats(&info, b);
+
+ fprintf(stderr, "supported SDL formats:\n");
+ spa_debug_format(2, NULL, params[0]);
+
+ return 1;
+}
+
+static int reneg_format(struct data *data)
+{
+ uint8_t buffer[1024];
+ struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
+ const struct spa_pod *params[2];
+ int32_t width, height;
+
+ if (data->format.info.raw.format == 0)
+ return -EBUSY;
+
+ width = data->counter & 1 ? 320 : 640;
+ height = data->counter & 1 ? 240 : 480;
+
+ fprintf(stderr, "renegotiate to %dx%d:\n", width, height);
+ params[0] = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
+ SPA_FORMAT_mediaType, SPA_POD_Id(SPA_MEDIA_TYPE_video),
+ SPA_FORMAT_mediaSubtype, SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw),
+ SPA_FORMAT_VIDEO_format, SPA_POD_Id(data->format.info.raw.format),
+ SPA_FORMAT_VIDEO_size, SPA_POD_Rectangle(&SPA_RECTANGLE(width, height)),
+ SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction(&data->format.info.raw.framerate));
+
+ pw_stream_update_params(data->stream, params, 1);
+
+ data->counter++;
+ return 0;
+}
+
+static int reneg_buffers(struct data *data)
+{
+ uint8_t buffer[1024];
+ struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
+ const struct spa_pod *params[2];
+
+ fprintf(stderr, "renegotiate buffers\n");
+ params[0] = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_ParamBuffers, SPA_PARAM_Buffers,
+ SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(8, 2, MAX_BUFFERS),
+ SPA_PARAM_BUFFERS_blocks, SPA_POD_Int(1),
+ SPA_PARAM_BUFFERS_size, SPA_POD_Int(data->stride * data->size.height),
+ SPA_PARAM_BUFFERS_stride, SPA_POD_Int(data->stride));
+
+ pw_stream_update_params(data->stream, params, 1);
+
+ data->counter++;
+ return 0;
+}
+
+static void on_timeout(void *userdata, uint64_t expirations)
+{
+ struct data *data = userdata;
+ if (1)
+ reneg_format(data);
+ else
+ reneg_buffers(data);
+}
+
+static void do_quit(void *userdata, int signal_number)
+{
+ struct data *data = userdata;
+ pw_main_loop_quit(data->loop);
+}
+
+int main(int argc, char *argv[])
+{
+ struct data data = { 0, };
+ const struct spa_pod *params[2];
+ uint8_t buffer[1024];
+ struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
+ struct pw_properties *props;
+ int res, n_params;
+
+ pw_init(&argc, &argv);
+
+ /* create a main loop */
+ data.loop = pw_main_loop_new(NULL);
+
+ pw_loop_add_signal(pw_main_loop_get_loop(data.loop), SIGINT, do_quit, &data);
+ pw_loop_add_signal(pw_main_loop_get_loop(data.loop), SIGTERM, do_quit, &data);
+
+ /* create a simple stream, the simple stream manages to core and remote
+ * objects for you if you don't need to deal with them
+ *
+ * If you plan to autoconnect your stream, you need to provide at least
+ * media, category and role properties
+ *
+ * Pass your events and a user_data pointer as the last arguments. This
+ * will inform you about the stream state. The most important event
+ * you need to listen to is the process event where you need to consume
+ * the data provided to you.
+ */
+ props = pw_properties_new(PW_KEY_MEDIA_TYPE, "Video",
+ PW_KEY_MEDIA_CATEGORY, "Capture",
+ PW_KEY_MEDIA_ROLE, "Camera",
+ NULL),
+ data.path = argc > 1 ? argv[1] : NULL;
+ if (data.path)
+ /* Set stream target if given on command line */
+ pw_properties_set(props, PW_KEY_TARGET_OBJECT, data.path);
+
+ data.stream = pw_stream_new_simple(
+ pw_main_loop_get_loop(data.loop),
+ "video-play-reneg",
+ props,
+ &stream_events,
+ &data);
+
+ if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+ fprintf(stderr, "can't initialize SDL: %s\n", SDL_GetError());
+ return -1;
+ }
+
+ if (SDL_CreateWindowAndRenderer
+ (WIDTH, HEIGHT, SDL_WINDOW_RESIZABLE, &data.window, &data.renderer)) {
+ fprintf(stderr, "can't create window: %s\n", SDL_GetError());
+ return -1;
+ }
+
+ /* build the extra parameters to connect with. To connect, we can provide
+ * a list of supported formats. We use a builder that writes the param
+ * object to the stack. */
+ n_params = build_format(&data, &b, params);
+
+ /* now connect the stream, we need a direction (input/output),
+ * an optional target node to connect to, some flags and parameters
+ */
+ if ((res = pw_stream_connect(data.stream,
+ PW_DIRECTION_INPUT,
+ PW_ID_ANY,
+ PW_STREAM_FLAG_AUTOCONNECT | /* try to automatically connect this stream */
+ PW_STREAM_FLAG_MAP_BUFFERS, /* mmap the buffer data for us */
+ params, n_params)) /* extra parameters, see above */ < 0) {
+ fprintf(stderr, "can't connect: %s\n", spa_strerror(res));
+ return -1;
+ }
+
+ data.timer = pw_loop_add_timer(pw_main_loop_get_loop(data.loop), on_timeout, &data);
+
+ /* do things until we quit the mainloop */
+ pw_main_loop_run(data.loop);
+
+ pw_stream_destroy(data.stream);
+ pw_main_loop_destroy(data.loop);
+
+ SDL_DestroyTexture(data.texture);
+ if (data.cursor)
+ SDL_DestroyTexture(data.cursor);
+ SDL_DestroyRenderer(data.renderer);
+ SDL_DestroyWindow(data.window);
+ pw_deinit();
+
+ return 0;
+}
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