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-rw-r--r--src/examples/video-play.c529
1 files changed, 529 insertions, 0 deletions
diff --git a/src/examples/video-play.c b/src/examples/video-play.c
new file mode 100644
index 0000000..9cbbab6
--- /dev/null
+++ b/src/examples/video-play.c
@@ -0,0 +1,529 @@
+/* PipeWire
+ *
+ * Copyright © 2018 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".
+ [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 pw_stream *stream;
+ struct spa_hook stream_listener;
+
+ struct spa_io_position *position;
+
+ struct spa_video_info format;
+ int32_t stride;
+ struct spa_rectangle size;
+
+ int counter;
+ SDL_Rect rect;
+ SDL_Rect cursor_rect;
+ bool is_yuv;
+};
+
+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;
+ struct spa_meta_region *mc;
+ struct spa_meta_cursor *mcs;
+ uint32_t i, j;
+ uint8_t *src, *dst;
+ bool render_cursor = false;
+
+ b = NULL;
+ 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_trace("new buffer %p", buf);
+
+ handle_events(data);
+
+ if ((sdata = buf->datas[0].data) == NULL)
+ goto done;
+
+ /* get the videocrop metadata if any */
+ if ((mc = spa_buffer_find_meta_data(buf, SPA_META_VideoCrop, sizeof(*mc))) &&
+ spa_meta_region_is_valid(mc)) {
+ data->rect.x = mc->region.position.x;
+ data->rect.y = mc->region.position.y;
+ data->rect.w = mc->region.size.width;
+ data->rect.h = mc->region.size.height;
+ }
+ /* get cursor metadata */
+ if ((mcs = spa_buffer_find_meta_data(buf, SPA_META_Cursor, sizeof(*mcs))) &&
+ spa_meta_cursor_is_valid(mcs)) {
+ struct spa_meta_bitmap *mb;
+ void *cdata;
+ int cstride;
+
+ data->cursor_rect.x = mcs->position.x;
+ data->cursor_rect.y = mcs->position.y;
+
+ mb = SPA_PTROFF(mcs, mcs->bitmap_offset, struct spa_meta_bitmap);
+ data->cursor_rect.w = mb->size.width;
+ data->cursor_rect.h = mb->size.height;
+
+ if (data->cursor == NULL) {
+ data->cursor = SDL_CreateTexture(data->renderer,
+ id_to_sdl_format(mb->format),
+ SDL_TEXTUREACCESS_STREAMING,
+ mb->size.width, mb->size.height);
+ SDL_SetTextureBlendMode(data->cursor, SDL_BLENDMODE_BLEND);
+ }
+
+
+ if (SDL_LockTexture(data->cursor, NULL, &cdata, &cstride) < 0) {
+ fprintf(stderr, "Couldn't lock cursor texture: %s\n", SDL_GetError());
+ goto done;
+ }
+
+ /* copy the cursor bitmap into the texture */
+ src = SPA_PTROFF(mb, mb->offset, uint8_t);
+ dst = cdata;
+ ostride = SPA_MIN(cstride, mb->stride);
+
+ for (i = 0; i < mb->size.height; i++) {
+ memcpy(dst, src, ostride);
+ dst += cstride;
+ src += mb->stride;
+ }
+ SDL_UnlockTexture(data->cursor);
+
+ render_cursor = true;
+ }
+
+ /* copy video image in texture */
+ if (data->is_yuv) {
+ sstride = data->stride;
+ SDL_UpdateYUVTexture(data->texture,
+ NULL,
+ sdata,
+ sstride,
+ SPA_PTROFF(sdata, sstride * data->size.height, void),
+ sstride / 2,
+ SPA_PTROFF(sdata, 5 * (sstride * data->size.height) / 4, void),
+ sstride / 2);
+ }
+ else {
+ if (SDL_LockTexture(data->texture, NULL, &ddata, &dstride) < 0) {
+ fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
+ goto done;
+ }
+
+ 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;
+
+ if (data->format.media_subtype == SPA_MEDIA_SUBTYPE_dsp) {
+ for (i = 0; i < data->size.height; i++) {
+ struct pixel *p = (struct pixel *) src;
+ for (j = 0; j < data->size.width; j++) {
+ dst[j * 4 + 0] = SPA_CLAMP(p[j].r * 255.0f, 0, 255);
+ dst[j * 4 + 1] = SPA_CLAMP(p[j].g * 255.0f, 0, 255);
+ dst[j * 4 + 2] = SPA_CLAMP(p[j].b * 255.0f, 0, 255);
+ dst[j * 4 + 3] = SPA_CLAMP(p[j].a * 255.0f, 0, 255);
+ }
+ src += sstride;
+ dst += dstride;
+ }
+ } else {
+ 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 and then the cursor if any */
+ SDL_RenderCopy(data->renderer, data->texture, &data->rect, NULL);
+ if (render_cursor) {
+ SDL_RenderCopy(data->renderer, data->cursor, NULL, &data->cursor_rect);
+ }
+ 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:
+ /* because we started inactive, activate ourselves now */
+ pw_stream_set_active(data->stream, true);
+ break;
+ default:
+ break;
+ }
+}
+
+static void
+on_stream_io_changed(void *_data, uint32_t id, void *area, uint32_t size)
+{
+ struct data *data = _data;
+
+ switch (id) {
+ case SPA_IO_Position:
+ data->position = area;
+ 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[5];
+ Uint32 sdl_format;
+ void *d;
+ int32_t mult, size;
+
+ /* 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)
+ return;
+
+ switch (data->format.media_subtype) {
+ case SPA_MEDIA_SUBTYPE_raw:
+ /* 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 = SPA_RECTANGLE(data->format.info.raw.size.width,
+ data->format.info.raw.size.height);
+ mult = 1;
+ break;
+ case SPA_MEDIA_SUBTYPE_dsp:
+ spa_format_video_dsp_parse(param, &data->format.info.dsp);
+ if (data->format.info.dsp.format != SPA_VIDEO_FORMAT_DSP_F32)
+ return;
+ sdl_format = SDL_PIXELFORMAT_RGBA32;
+ data->size = SPA_RECTANGLE(data->position->video.size.width,
+ data->position->video.size.height);
+ mult = 4;
+ break;
+ default:
+ sdl_format = SDL_PIXELFORMAT_UNKNOWN;
+ break;
+ }
+
+ 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);
+
+ switch(sdl_format) {
+ case SDL_PIXELFORMAT_YV12:
+ case SDL_PIXELFORMAT_IYUV:
+ size = (data->stride * data->size.height) * 3 / 2;
+ data->is_yuv = true;
+ break;
+ default:
+ size = data->stride * data->size.height;
+ break;
+ }
+
+ data->rect.x = 0;
+ data->rect.y = 0;
+ data->rect.w = data->size.width;
+ data->rect.h = data->size.height;
+
+ /* 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(size * mult),
+ SPA_PARAM_BUFFERS_stride, SPA_POD_Int(data->stride * mult),
+ SPA_PARAM_BUFFERS_dataType, SPA_POD_CHOICE_FLAGS_Int((1<<SPA_DATA_MemPtr)));
+
+ /* a header metadata with timing information */
+ params[1] = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
+ SPA_PARAM_META_type, SPA_POD_Id(SPA_META_Header),
+ SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_header)));
+ /* video cropping information */
+ params[2] = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
+ SPA_PARAM_META_type, SPA_POD_Id(SPA_META_VideoCrop),
+ SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_region)));
+#define CURSOR_META_SIZE(w,h) (sizeof(struct spa_meta_cursor) + \
+ sizeof(struct spa_meta_bitmap) + w * h * 4)
+ /* cursor information */
+ params[3] = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
+ SPA_PARAM_META_type, SPA_POD_Id(SPA_META_Cursor),
+ SPA_PARAM_META_size, SPA_POD_CHOICE_RANGE_Int(
+ CURSOR_META_SIZE(64,64),
+ CURSOR_META_SIZE(1,1),
+ CURSOR_META_SIZE(256,256)));
+
+ /* we are done */
+ pw_stream_update_params(stream, params, 4);
+}
+
+/* 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,
+ .io_changed = on_stream_io_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]);
+
+ params[1] = 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_dsp),
+ SPA_FORMAT_VIDEO_format, SPA_POD_Id(SPA_VIDEO_FORMAT_DSP_F32));
+
+ fprintf(stderr, "supported DSP formats:\n");
+ spa_debug_format(2, NULL, params[1]);
+
+ return 2;
+}
+
+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)
+ 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",
+ 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_INACTIVE | /* we will activate ourselves */
+ 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;
+ }
+
+ /* 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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