mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
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137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
/*
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[title]
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\ref page_tutorial5
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[title]
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*/
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/* [code] */
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#include <spa/param/video/format-utils.h>
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#include <spa/debug/types.h>
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#include <spa/param/video/type-info.h>
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#include <pipewire/pipewire.h>
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struct data {
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struct pw_main_loop *loop;
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struct pw_stream *stream;
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struct spa_video_info format;
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};
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/* [on_process] */
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static void on_process(void *userdata)
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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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if ((b = pw_stream_dequeue_buffer(data->stream)) == NULL) {
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pw_log_warn("out of buffers: %m");
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return;
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}
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buf = b->buffer;
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if (buf->datas[0].data == NULL)
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return;
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/** copy frame data to screen */
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printf("got a frame of size %d\n", buf->datas[0].chunk->size);
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pw_stream_queue_buffer(data->stream, b);
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}
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/* [on_process] */
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static void on_param_changed(void *userdata, uint32_t id, const struct spa_pod *param)
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{
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struct data *data = userdata;
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if (param == NULL || id != SPA_PARAM_Format)
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return;
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if (spa_format_parse(param,
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&data->format.media_type,
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&data->format.media_subtype) < 0)
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return;
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if (data->format.media_type != SPA_MEDIA_TYPE_video ||
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data->format.media_subtype != SPA_MEDIA_SUBTYPE_raw)
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return;
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if (spa_format_video_raw_parse(param, &data->format.info.raw) < 0)
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return;
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printf("got video format:\n");
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printf(" format: %d (%s)\n", data->format.info.raw.format,
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spa_debug_type_find_name(spa_type_video_format,
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data->format.info.raw.format));
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printf(" size: %dx%d\n", data->format.info.raw.size.width,
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data->format.info.raw.size.height);
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printf(" framerate: %d/%d\n", data->format.info.raw.framerate.num,
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data->format.info.raw.framerate.denom);
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/** prepare to render video of this size */
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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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.param_changed = on_param_changed,
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.process = on_process,
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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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data.loop = pw_main_loop_new(NULL);
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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-capture",
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pw_properties_new(
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PW_KEY_MEDIA_TYPE, "Video",
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PW_KEY_MEDIA_CATEGORY, "Capture",
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PW_KEY_MEDIA_ROLE, "Camera",
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NULL),
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&stream_events,
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&data);
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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_CHOICE_ENUM_Id(7,
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SPA_VIDEO_FORMAT_RGB,
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SPA_VIDEO_FORMAT_RGB,
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SPA_VIDEO_FORMAT_RGBA,
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SPA_VIDEO_FORMAT_RGBx,
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SPA_VIDEO_FORMAT_BGRx,
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SPA_VIDEO_FORMAT_YUY2,
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SPA_VIDEO_FORMAT_I420),
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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_CHOICE_RANGE_Fraction(
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&SPA_FRACTION(25, 1),
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&SPA_FRACTION(0, 1),
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&SPA_FRACTION(1000, 1)));
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pw_stream_connect(data.stream,
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PW_DIRECTION_INPUT,
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argc > 1 ? (uint32_t)atoi(argv[1]) : PW_ID_ANY,
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PW_STREAM_FLAG_AUTOCONNECT |
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PW_STREAM_FLAG_MAP_BUFFERS,
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params, 1);
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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;
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}
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/* [code] */
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