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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* UVC stream handling
*
* Copyright (C) 2010-2018 Laurent Pinchart
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "events.h"
#include "stream.h"
#include "uvc.h"
#include "v4l2.h"
#include "video-buffers.h"
#include "video-source.h"
/*
* struct uvc_stream - Representation of a UVC stream
* @src: video source
* @uvc: UVC V4L2 output device
* @events: struct events containing event information
*/
struct uvc_stream
{
struct video_source *src;
struct uvc_device *uvc;
struct events *events;
};
/* ---------------------------------------------------------------------------
* Video streaming
*/
static void uvc_stream_source_process(void *d, struct video_source *src,
struct video_buffer *buffer)
{
struct uvc_stream *stream = d;
struct v4l2_device *sink = uvc_v4l2_device(stream->uvc);
v4l2_queue_buffer(sink, buffer);
}
static void uvc_stream_uvc_process(void *d)
{
struct uvc_stream *stream = d;
struct v4l2_device *sink = uvc_v4l2_device(stream->uvc);
struct video_buffer buf;
int ret;
ret = v4l2_dequeue_buffer(sink, &buf);
if (ret < 0)
return;
video_source_queue_buffer(stream->src, &buf);
}
static int uvc_stream_start(struct uvc_stream *stream)
{
struct v4l2_device *sink = uvc_v4l2_device(stream->uvc);
struct video_buffer_set *buffers = NULL;
int ret;
printf("Starting video stream.\n");
/* Allocate and export the buffers on the source. */
ret = video_source_alloc_buffers(stream->src, 4);
if (ret < 0) {
printf("Failed to allocate source buffers: %s (%d)\n",
strerror(-ret), -ret);
return ret;
}
ret = video_source_export_buffers(stream->src, &buffers);
if (ret < 0) {
printf("Failed to export buffers on source: %s (%d)\n",
strerror(-ret), -ret);
goto error_free_source;
}
/* Allocate and import the buffers on the sink. */
ret = v4l2_alloc_buffers(sink, V4L2_MEMORY_DMABUF, buffers->nbufs);
if (ret < 0) {
printf("Failed to allocate sink buffers: %s (%d)\n",
strerror(-ret), -ret);
goto error_free_source;
}
ret = v4l2_import_buffers(sink, buffers);
if (ret < 0) {
printf("Failed to import buffers on sink: %s (%d)\n",
strerror(-ret), -ret);
goto error_free_sink;
}
/* Start the source and sink. */
video_source_stream_on(stream->src);
v4l2_stream_on(sink);
events_watch_fd(stream->events, sink->fd, EVENT_WRITE,
uvc_stream_uvc_process, stream);
return 0;
error_free_sink:
v4l2_free_buffers(sink);
error_free_source:
video_source_free_buffers(stream->src);
if (buffers)
video_buffer_set_delete(buffers);
return ret;
}
static int uvc_stream_stop(struct uvc_stream *stream)
{
struct v4l2_device *sink = uvc_v4l2_device(stream->uvc);
printf("Stopping video stream.\n");
events_unwatch_fd(stream->events, sink->fd, EVENT_WRITE);
v4l2_stream_off(sink);
video_source_stream_off(stream->src);
v4l2_free_buffers(sink);
video_source_free_buffers(stream->src);
return 0;
}
void uvc_stream_enable(struct uvc_stream *stream, int enable)
{
if (enable)
uvc_stream_start(stream);
else
uvc_stream_stop(stream);
}
/* ---------------------------------------------------------------------------
* Stream handling
*/
struct uvc_stream *uvc_stream_new(const char *uvc_device)
{
struct uvc_stream *stream;
stream = malloc(sizeof(*stream));
if (stream == NULL)
return NULL;
memset(stream, 0, sizeof(*stream));
stream->uvc = uvc_open(uvc_device, stream);
if (stream->uvc == NULL)
goto error;
return stream;
error:
free(stream);
return NULL;
}
void uvc_stream_delete(struct uvc_stream *stream)
{
if (stream == NULL)
return;
uvc_close(stream->uvc);
free(stream);
}
void uvc_stream_init_uvc(struct uvc_stream *stream,
struct uvc_function_config *fc)
{
uvc_set_config(stream->uvc, fc);
uvc_events_init(stream->uvc, stream->events);
}
void uvc_stream_set_event_handler(struct uvc_stream *stream,
struct events *events)
{
stream->events = events;
}
void uvc_stream_set_video_source(struct uvc_stream *stream,
struct video_source *src)
{
stream->src = src;
video_source_set_buffer_handler(src, uvc_stream_source_process, stream);
}
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