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/*
* UVC stream handling
*
* Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
*/
#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;
v4l2_queue_buffer(stream->uvc->vdev, buffer);
}
static void uvc_stream_uvc_process(void *d)
{
struct uvc_stream *stream = d;
struct video_buffer buf;
int ret;
ret = v4l2_dequeue_buffer(stream->uvc->vdev, &buf);
if (ret < 0)
return;
video_source_queue_buffer(stream->src, &buf);
}
static int uvc_stream_start(struct uvc_stream *stream)
{
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(stream->uvc->vdev, 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(stream->uvc->vdev, 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(stream->uvc->vdev);
events_watch_fd(stream->events, stream->uvc->vdev->fd, EVENT_WRITE,
uvc_stream_uvc_process, stream);
return 0;
error_free_sink:
v4l2_free_buffers(stream->uvc->vdev);
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)
{
printf("Stopping video stream.\n");
events_unwatch_fd(stream->events, stream->uvc->vdev->fd, EVENT_WRITE);
v4l2_stream_off(stream->uvc->vdev);
video_source_stream_off(stream->src);
v4l2_free_buffers(stream->uvc->vdev);
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);
}
int uvc_stream_set_format(struct uvc_stream *stream,
const struct v4l2_pix_format *format)
{
struct v4l2_pix_format fmt = *format;
int ret;
printf("Setting format to 0x%08x %ux%u\n",
format->pixelformat, format->width, format->height);
ret = uvc_set_format(stream->uvc, &fmt);
if (ret < 0)
return ret;
return video_source_set_format(stream->src, &fmt);
}
/* ---------------------------------------------------------------------------
* 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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