video-play.c

Video input stream using pw_stream.

/* 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_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;
}
format.h
spa/debug/format.h
PW_ID_ANY
#define PW_ID_ANY
Definition: core.h:83
PW_KEY_MEDIA_TYPE
#define PW_KEY_MEDIA_TYPE
Media.
Definition: keys.h:429
PW_KEY_MEDIA_ROLE
#define PW_KEY_MEDIA_ROLE
Role: Movie, Music, Camera, Screen, Communication, Game, Notification, DSP, Production,...
Definition: keys.h:435
PW_KEY_MEDIA_CATEGORY
#define PW_KEY_MEDIA_CATEGORY
Media Category: Playback, Capture, Duplex, Monitor, Manager.
Definition: keys.h:432
pw_log_trace
#define pw_log_trace(...)
Definition: log.h:166
pw_log_warn
#define pw_log_warn(...)
Definition: log.h:163
pw_loop_add_signal
#define pw_loop_add_signal(l,...)
Definition: loop.h:83
pw_main_loop_new
struct pw_main_loop * pw_main_loop_new(const struct spa_dict *props)
Create a new main loop.
Definition: main-loop.c:80
pw_main_loop_quit
int pw_main_loop_quit(struct pw_main_loop *loop)
Quit a main loop.
Definition: main-loop.c:125
pw_main_loop_destroy
void pw_main_loop_destroy(struct pw_main_loop *loop)
Destroy a loop.
Definition: main-loop.c:90
pw_main_loop_run
int pw_main_loop_run(struct pw_main_loop *loop)
Run a main loop.
Definition: main-loop.c:139
pw_main_loop_get_loop
struct pw_loop * pw_main_loop_get_loop(struct pw_main_loop *loop)
Get the loop implementation.
Definition: main-loop.c:113
pw_init
void pw_init(int *argc, char **argv[])
Initialize PipeWire.
Definition: pipewire.c:586
pw_deinit
void pw_deinit(void)
Definition: pipewire.c:676
PW_DIRECTION_INPUT
#define PW_DIRECTION_INPUT
Definition: port.h:65
pw_properties_new
struct pw_properties * pw_properties_new(const char *key,...) 1
Make a new properties object.
Definition: properties.c:102
pw_stream_update_params
int int pw_stream_update_params(struct pw_stream *stream, const struct spa_pod **params, uint32_t n_params)
Complete the negotiation process with result code res.
Definition: stream.c:1963
pw_stream_connect
int pw_stream_connect(struct pw_stream *stream, enum pw_direction direction, uint32_t target_id, enum pw_stream_flags flags, const struct spa_pod **params, uint32_t n_params)
Connect a stream for input or output on port_path.
Definition: stream.c:1678
pw_stream_set_error
int pw_stream_set_error(struct pw_stream *stream, int res, const char *error,...) 1(3
Set the stream in error state.
pw_stream_new_simple
struct pw_stream * pw_stream_new_simple(struct pw_loop *loop, const char *name, struct pw_properties *props, const struct pw_stream_events *events, void *data)
Definition: stream.c:1432
pw_stream_state
pw_stream_state
The state of a stream.
Definition: stream.h:173
pw_stream_set_active
int pw_stream_set_active(struct pw_stream *stream, bool active)
Activate or deactivate the stream.
Definition: stream.c:2047
pw_stream_dequeue_buffer
struct pw_buffer * pw_stream_dequeue_buffer(struct pw_stream *stream)
Get a buffer that can be filled for playback streams or consumed for capture streams.
Definition: stream.c:2100
pw_stream_queue_buffer
int pw_stream_queue_buffer(struct pw_stream *stream, struct pw_buffer *buffer)
Submit a buffer for playback or recycle a buffer for capture.
Definition: stream.c:2127
pw_stream_state_as_string
const char * pw_stream_state_as_string(enum pw_stream_state state)
Convert a stream state to a readable string.
Definition: stream.c:1476
PW_VERSION_STREAM_EVENTS
#define PW_VERSION_STREAM_EVENTS
Definition: stream.h:219
pw_stream_destroy
void pw_stream_destroy(struct pw_stream *stream)
Destroy a stream.
Definition: stream.c:1494
PW_STREAM_FLAG_INACTIVE
@ PW_STREAM_FLAG_INACTIVE
start the stream inactive, pw_stream_set_active() needs to be called explicitly
Definition: stream.h:264
PW_STREAM_FLAG_MAP_BUFFERS
@ PW_STREAM_FLAG_MAP_BUFFERS
mmap the buffers except DmaBuf
Definition: stream.h:267
PW_STREAM_FLAG_AUTOCONNECT
@ PW_STREAM_FLAG_AUTOCONNECT
try to automatically connect this stream
Definition: stream.h:262
PW_STREAM_STATE_PAUSED
@ PW_STREAM_STATE_PAUSED
paused
Definition: stream.h:177
PW_STREAM_STATE_UNCONNECTED
@ PW_STREAM_STATE_UNCONNECTED
unconnected
Definition: stream.h:175
spa_buffer_find_meta_data
static void * spa_buffer_find_meta_data(const struct spa_buffer *b, uint32_t type, size_t size)
Definition: buffer.h:124
spa_meta_region_is_valid
#define spa_meta_region_is_valid(m)
Definition: meta.h:106
spa_meta_cursor_is_valid
#define spa_meta_cursor_is_valid(m)
Definition: meta.h:135
SPA_META_Cursor
@ SPA_META_Cursor
struct spa_meta_cursor
Definition: meta.h:51
SPA_META_VideoCrop
@ SPA_META_VideoCrop
struct spa_meta_region with cropping data
Definition: meta.h:48
SPA_META_Header
@ SPA_META_Header
struct spa_meta_header
Definition: meta.h:47
SPA_DATA_MemPtr
@ SPA_DATA_MemPtr
pointer to memory, the data field in struct spa_data is set.
Definition: buffer.h:52
spa_debug_format
static int spa_debug_format(int indent, const struct spa_type_info *info, const struct spa_pod *format)
Definition: format.h:122
SPA_IO_Position
@ SPA_IO_Position
position information in the graph, struct spa_io_position
Definition: io.h:64
spa_format_parse
static int spa_format_parse(const struct spa_pod *format, uint32_t *media_type, uint32_t *media_subtype)
Definition: format-utils.h:47
spa_format_video_dsp_parse
static int spa_format_video_dsp_parse(const struct spa_pod *format, struct spa_video_info_dsp *info)
Definition: format-utils.h:70
spa_format_video_raw_parse
static int spa_format_video_raw_parse(const struct spa_pod *format, struct spa_video_info_raw *info)
Definition: format-utils.h:47
SPA_PARAM_META_size
@ SPA_PARAM_META_size
the expected maximum size the meta (Int)
Definition: param.h:105
SPA_PARAM_META_type
@ SPA_PARAM_META_type
the metadata, one of enum spa_meta_type (Id enum spa_meta_type)
Definition: param.h:104
SPA_MEDIA_TYPE_video
@ SPA_MEDIA_TYPE_video
Definition: format.h:48
SPA_PARAM_Format
@ SPA_PARAM_Format
configured format as SPA_TYPE_OBJECT_Format
Definition: param.h:54
SPA_PARAM_Meta
@ SPA_PARAM_Meta
allowed metadata for buffers as SPA_TYPE_OBJECT_ParamMeta
Definition: param.h:56
SPA_PARAM_EnumFormat
@ SPA_PARAM_EnumFormat
available formats as SPA_TYPE_OBJECT_Format
Definition: param.h:53
SPA_PARAM_Buffers
@ SPA_PARAM_Buffers
buffer configurations as SPA_TYPE_OBJECT_ParamBuffers
Definition: param.h:55
SPA_FORMAT_mediaType
@ SPA_FORMAT_mediaType
media type (Id enum spa_media_type)
Definition: format.h:109
SPA_FORMAT_VIDEO_format
@ SPA_FORMAT_VIDEO_format
video format (Id enum spa_video_format)
Definition: format.h:127
SPA_FORMAT_mediaSubtype
@ SPA_FORMAT_mediaSubtype
media subtype (Id enum spa_media_subtype)
Definition: format.h:110
SPA_MEDIA_SUBTYPE_dsp
@ SPA_MEDIA_SUBTYPE_dsp
Definition: format.h:59
SPA_MEDIA_SUBTYPE_raw
@ SPA_MEDIA_SUBTYPE_raw
Definition: format.h:58
SPA_VIDEO_FORMAT_DSP_F32
@ SPA_VIDEO_FORMAT_DSP_F32
Definition: raw.h:157
SPA_PARAM_BUFFERS_dataType
@ SPA_PARAM_BUFFERS_dataType
possible memory types (Int, mask of enum spa_data_type)
Definition: param.h:98
SPA_PARAM_BUFFERS_size
@ SPA_PARAM_BUFFERS_size
size of a data block memory (Int)
Definition: param.h:95
SPA_PARAM_BUFFERS_stride
@ SPA_PARAM_BUFFERS_stride
stride of data block memory (Int)
Definition: param.h:96
SPA_PARAM_BUFFERS_blocks
@ SPA_PARAM_BUFFERS_blocks
number of data blocks per buffer (Int)
Definition: param.h:94
SPA_PARAM_BUFFERS_buffers
@ SPA_PARAM_BUFFERS_buffers
number of buffers (Int)
Definition: param.h:93
SPA_POD_CHOICE_RANGE_Int
#define SPA_POD_CHOICE_RANGE_Int(def, min, max)
Definition: vararg.h:78
SPA_POD_Id
#define SPA_POD_Id(val)
Definition: vararg.h:69
SPA_POD_BUILDER_INIT
#define SPA_POD_BUILDER_INIT(buffer, size)
Definition: builder.h:82
spa_pod_builder_add_object
#define spa_pod_builder_add_object(b, type, id,...)
Definition: builder.h:677
SPA_POD_Int
#define SPA_POD_Int(val)
Definition: vararg.h:74
SPA_POD_CHOICE_FLAGS_Int
#define SPA_POD_CHOICE_FLAGS_Int(flags)
Definition: vararg.h:82
spa_strerror
#define spa_strerror(err)
Definition: result.h:69
SPA_TYPE_OBJECT_ParamBuffers
@ SPA_TYPE_OBJECT_ParamBuffers
Definition: type.h:97
SPA_TYPE_OBJECT_ParamMeta
@ SPA_TYPE_OBJECT_ParamMeta
Definition: type.h:98
SPA_TYPE_OBJECT_Format
@ SPA_TYPE_OBJECT_Format
Definition: type.h:96
SPA_MIN
#define SPA_MIN(a, b)
Definition: defs.h:146
SPA_CLAMP
#define SPA_CLAMP(v, low, high)
Definition: defs.h:158
SPA_PTROFF
#define SPA_PTROFF(ptr_, offset_, type_)
Return the address (buffer + offset) as pointer of type.
Definition: defs.h:183
SPA_RECTANGLE
#define SPA_RECTANGLE(width, height)
Definition: defs.h:99
pipewire.h
pipewire/pipewire.h
props.h
result.h
spa/utils/result.h
pw_buffer
Definition: stream.h:181
pw_buffer::buffer
struct spa_buffer * buffer
the spa buffer
Definition: stream.h:182
pw_main_loop
A main loop object.
pw_stream_events
Events for a stream.
Definition: stream.h:217
pw_stream
spa_buffer
A Buffer.
Definition: buffer.h:105
spa_buffer::datas
struct spa_data * datas
array of data members
Definition: buffer.h:109
spa_chunk::stride
int32_t stride
stride of valid data
Definition: buffer.h:68
spa_data::chunk
struct spa_chunk * chunk
valid chunk of memory
Definition: buffer.h:101
spa_data::data
void * data
optional data pointer
Definition: buffer.h:100
spa_hook
A hook, contains the structure with functions and the data passed to the functions.
Definition: hook.h:342
spa_io_position
The position information adds extra meaning to the raw clock times.
Definition: io.h:293
spa_meta_bitmap
Bitmap information.
Definition: meta.h:123
spa_meta_bitmap::size
struct spa_rectangle size
width and height of bitmap
Definition: meta.h:127
spa_meta_bitmap::format
uint32_t format
bitmap video format, one of enum spa_video_format.
Definition: meta.h:124
spa_meta_bitmap::offset
uint32_t offset
offset of bitmap data in this structure.
Definition: meta.h:129
spa_meta_bitmap::stride
int32_t stride
stride of bitmap data
Definition: meta.h:128
spa_meta_cursor
Cursor information.
Definition: meta.h:142
spa_meta_cursor::position
struct spa_point position
position on screen
Definition: meta.h:146
spa_meta_cursor::bitmap_offset
uint32_t bitmap_offset
offset of bitmap meta in this structure.
Definition: meta.h:149
spa_meta_header
Describes essential buffer header metadata such as flags and timestamps.
Definition: meta.h:80
spa_meta_region
metadata structure for Region or an array of these for RegionArray
Definition: meta.h:102
spa_meta_region::region
struct spa_region region
Definition: meta.h:103
spa_pod_builder
Definition: builder.h:73
spa_pod_builder::data
void * data
Definition: builder.h:74
spa_pod
Definition: pod.h:63
spa_pod::size
uint32_t size
Definition: pod.h:64
spa_point::y
int32_t y
Definition: defs.h:109
spa_point::x
int32_t x
Definition: defs.h:108
spa_rectangle
Definition: defs.h:100
spa_rectangle::width
uint32_t width
Definition: defs.h:101
spa_rectangle::height
uint32_t height
Definition: defs.h:102
spa_region::position
struct spa_point position
Definition: defs.h:115
spa_region::size
struct spa_rectangle size
Definition: defs.h:116
spa_video_info
Definition: format.h:45
format-utils.h