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spa/src/examples/video-play.c

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/* 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;
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;
}
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_align, SPA_POD_Int(16),
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));
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.
*/
data.stream = pw_stream_new_simple(
pw_main_loop_get_loop(data.loop),
"video-play",
pw_properties_new(
PW_KEY_MEDIA_TYPE, "Video",
PW_KEY_MEDIA_CATEGORY, "Capture",
PW_KEY_MEDIA_ROLE, "Camera",
NULL),
&stream_events,
&data);
data.path = argc > 1 ? argv[1] : NULL;
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,
data.path ? (uint32_t)atoi(data.path) : 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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