From patchwork Sat Jun 2 21:01:45 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Machek X-Patchwork-Id: 10445003 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 89B61602BD for ; Sat, 2 Jun 2018 21:01:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6A75328AC3 for ; Sat, 2 Jun 2018 21:01:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5AFE128AC8; Sat, 2 Jun 2018 21:01:54 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3F5CB28AC3 for ; Sat, 2 Jun 2018 21:01:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750913AbeFBVBs (ORCPT ); Sat, 2 Jun 2018 17:01:48 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:38679 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750827AbeFBVBr (ORCPT ); Sat, 2 Jun 2018 17:01:47 -0400 Received: by atrey.karlin.mff.cuni.cz (Postfix, from userid 512) id 4D3D4805BD; Sat, 2 Jun 2018 23:01:46 +0200 (CEST) Date: Sat, 2 Jun 2018 23:01:45 +0200 From: Pavel Machek To: Mauro Carvalho Chehab Cc: Mauro Carvalho Chehab , Hans Verkuil , pali.rohar@gmail.com, sre@kernel.org, Sakari Ailus , linux-media@vger.kernel.org, hans.verkuil@cisco.com Subject: Re: [RFC, libv4l]: Make libv4l2 usable on devices with complex pipeline Message-ID: <20180602210145.GB20439@amd> References: <20180316205512.GA6069@amd> <20180319102354.GA12557@amd> <20180319074715.5b700405@vento.lan> <20180319120043.GA20451@amd> <20180319095544.7e235a3e@vento.lan> <20180515200117.GA21673@amd> <20180515190314.2909e3be@vento.lan> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20180515190314.2909e3be@vento.lan> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Hi! Ok, can I get any comments on this one? v4l2_open_complex("/file/with/descriptor", 0) can be used to open whole pipeline at once, and work if it as if it was one device. Thanks, Pavel diff --git a/lib/include/libv4l2.h b/lib/include/libv4l2.h index ea1870d..f170c3d 100644 --- a/lib/include/libv4l2.h +++ b/lib/include/libv4l2.h @@ -109,6 +109,12 @@ LIBV4L_PUBLIC int v4l2_get_control(int fd, int cid); (note the fd is left open in this case). */ LIBV4L_PUBLIC int v4l2_fd_open(int fd, int v4l2_flags); +/* v4l2_open_complex: open complex pipeline. Name of pipeline descriptor + is passed to v4l2_open_complex(). It opens devices described there and + handles mapping controls between devices. + */ +LIBV4L_PUBLIC int v4l2_open_complex(char *name, int v4l2_flags); + #ifdef __cplusplus } #endif /* __cplusplus */ diff --git a/lib/libv4l2/libv4l2-priv.h b/lib/libv4l2/libv4l2-priv.h index 1924c91..1ee697a 100644 --- a/lib/libv4l2/libv4l2-priv.h +++ b/lib/libv4l2/libv4l2-priv.h @@ -104,6 +104,7 @@ struct v4l2_dev_info { void *plugin_library; void *dev_ops_priv; const struct libv4l_dev_ops *dev_ops; + struct v4l2_controls_map *map; }; /* From v4l2-plugin.c */ @@ -130,4 +131,20 @@ static inline void v4l2_plugin_cleanup(void *plugin_lib, void *plugin_priv, extern const char *v4l2_ioctls[]; void v4l2_log_ioctl(unsigned long int request, void *arg, int result); + +struct v4l2_control_map { + unsigned long control; + int fd; +}; + +struct v4l2_controls_map { + int main_fd; + int num_fds; + int num_controls; + struct v4l2_control_map map[]; +}; + +int v4l2_open_pipeline(struct v4l2_controls_map *map, int v4l2_flags); +LIBV4L_PUBLIC int v4l2_get_fd_for_control(int fd, unsigned long control); + #endif diff --git a/lib/libv4l2/libv4l2.c b/lib/libv4l2/libv4l2.c index 2db25d1..39f69db 100644 --- a/lib/libv4l2/libv4l2.c +++ b/lib/libv4l2/libv4l2.c @@ -70,6 +70,8 @@ #include #include #include +#include + #include "libv4l2.h" #include "libv4l2-priv.h" #include "libv4l-plugin.h" @@ -787,6 +789,8 @@ no_capture: if (index >= devices_used) devices_used = index + 1; + devices[index].map = NULL; + /* Note we always tell v4lconvert to optimize src fmt selection for our default fps, the only exception is the app explicitly selecting a frame rate using the S_PARM ioctl after a S_FMT */ @@ -1056,12 +1060,47 @@ static int v4l2_s_fmt(int index, struct v4l2_format *dest_fmt) return 0; } +int v4l2_get_fd_for_control(int fd, unsigned long control) +{ + int index = v4l2_get_index(fd); + struct v4l2_controls_map *map; + int lo = 0; + int hi; + + if (index < 0) + return fd; + + map = devices[index].map; + if (!map) + return fd; + hi = map->num_controls; + + while (lo < hi) { + int i = (lo + hi) / 2; + if (map->map[i].control == control) { + return map->map[i].fd; + } + if (map->map[i].control > control) { + hi = i; + continue; + } + if (map->map[i].control < control) { + lo = i+1; + continue; + } + printf("Bad: impossible condition in binary search\n"); + exit(1); + } + return fd; +} + int v4l2_ioctl(int fd, unsigned long int request, ...) { void *arg; va_list ap; int result, index, saved_err; - int is_capture_request = 0, stream_needs_locking = 0; + int is_capture_request = 0, stream_needs_locking = 0, + is_subdev_request = 0; va_start(ap, request); arg = va_arg(ap, void *); @@ -1076,18 +1115,20 @@ int v4l2_ioctl(int fd, unsigned long int request, ...) ioctl, causing it to get sign extended, depending upon this behavior */ request = (unsigned int)request; + /* FIXME */ if (devices[index].convert == NULL) goto no_capture_request; /* Is this a capture request and do we need to take the stream lock? */ switch (request) { - case VIDIOC_QUERYCAP: case VIDIOC_QUERYCTRL: case VIDIOC_G_CTRL: case VIDIOC_S_CTRL: case VIDIOC_G_EXT_CTRLS: - case VIDIOC_TRY_EXT_CTRLS: case VIDIOC_S_EXT_CTRLS: + is_subdev_request = 1; + case VIDIOC_QUERYCAP: + case VIDIOC_TRY_EXT_CTRLS: case VIDIOC_ENUM_FRAMESIZES: case VIDIOC_ENUM_FRAMEINTERVALS: is_capture_request = 1; @@ -1151,10 +1192,15 @@ int v4l2_ioctl(int fd, unsigned long int request, ...) } if (!is_capture_request) { + int sub_fd; no_capture_request: + sub_fd = fd; + if (is_subdev_request) { + sub_fd = v4l2_get_fd_for_control(index, ((struct v4l2_queryctrl *) arg)->id); + } result = devices[index].dev_ops->ioctl( devices[index].dev_ops_priv, - fd, request, arg); + sub_fd, request, arg); saved_err = errno; v4l2_log_ioctl(request, arg, result); errno = saved_err; @@ -1782,3 +1828,195 @@ int v4l2_get_control(int fd, int cid) (qctrl.maximum - qctrl.minimum) / 2) / (qctrl.maximum - qctrl.minimum); } + + +int v4l2_open_pipeline(struct v4l2_controls_map *map, int v4l2_flags) +{ + int index; + int i; + + for (i=0; inum_controls; i++) { + if (map->map[i].fd <= 0) { + V4L2_LOG_ERR("v4l2_open_pipeline: Bad fd in map.\n"); + return -1; + } + if (i>=1 && map->map[i].control <= map->map[i-1].control) { + V4L2_LOG_ERR("v4l2_open_pipeline: Controls not sorted.\n"); + return -1; + } + } + + i = v4l2_fd_open(map->main_fd, v4l2_flags); + index = v4l2_get_index(map->main_fd); + devices[index].map = map; + return i; +} + +static void scan_devices(char **device_names, int *device_fds, int num) +{ + struct dirent **namelist; + int n; + char *class_v4l = "/sys/class/video4linux"; + + n = scandir(class_v4l, &namelist, NULL, alphasort); + if (n < 0) { + perror("scandir"); + return; + } + + while (n--) { + if (namelist[n]->d_name[0] != '.') { + char filename[1024], content[1024]; + sprintf(filename, "%s/%s/name", class_v4l, namelist[n]->d_name); + FILE *f = fopen(filename, "r"); + if (!f) { + printf("Strange, can't open %s", filename); + } else { + fgets(content, 1024, f); + fclose(f); + + int i; + for (i = num-1; i >=0; i--) { + if (!strcmp(content, device_names[i])) { + sprintf(filename, "/dev/%s", namelist[n]->d_name); + device_fds[i] = open(filename, O_RDWR); + if (device_fds[i] < 0) { + V4L2_LOG_ERR("Error opening %s: %m\n", filename); + } + } + } + } + } + free(namelist[n]); + } + free(namelist); + +} + +int v4l2_open_complex(char *name, int v4l2_flags) +{ +#define perr(s) V4L2_LOG_ERR("open_complex: " s "\n") +#define BUF 256 + FILE *f = fopen(name, "r"); + + int res = -1; + char buf[BUF]; + int version, num_modes, num_devices, num_controls; + int dev, control; + + if (!f) { + perr("open of .cv file failed: %m"); + goto err; + } + + if (fscanf(f, "Complex Video: %d\n", &version) != 1) { + perr(".cv file does not have required header"); + goto close; + } + + if (version != 0) { + perr(".cv file has unknown version"); + goto close; + } + + if (fscanf(f, "#modes: %d\n", &num_modes) != 1) { + perr("could not parse modes"); + goto close; + } + + if (num_modes != 1) { + perr("only single mode is supported for now"); + goto close; + } + + if (fscanf(f, "Mode: %s\n", buf) != 1) { + perr("could not parse mode name"); + goto close; + } + + if (fscanf(f, " #devices: %d\n", &num_devices) != 1) { + perr("could not parse number of devices"); + goto close; + } +#define MAX_DEVICES 16 + char *device_names[MAX_DEVICES] = { NULL, }; + int device_fds[MAX_DEVICES]; + if (num_devices > MAX_DEVICES) { + perr("too many devices"); + goto close; + } + + for (dev = 0; dev < num_devices; dev++) { + int tmp; + if (fscanf(f, "%d: ", &tmp) != 1) { + perr("could not parse device"); + goto free_devices; + } + if (tmp != dev) { + perr("bad device number"); + goto free_devices; + } + fgets(buf, BUF, f); + device_names[dev] = strdup(buf); + device_fds[dev] = -1; + } + + scan_devices(device_names, device_fds, num_devices); + + for (dev = 0; dev < num_devices; dev++) { + if (device_fds[dev] == -1) { + perr("Could not open all required devices"); + goto close_devices; + } + } + + if (fscanf(f, " #controls: %d\n", &num_controls) != 1) { + perr("can not parse number of controls"); + goto close_devices; + } + + struct v4l2_controls_map *map = malloc(sizeof(struct v4l2_controls_map) + + num_controls*sizeof(struct v4l2_control_map)); + + map->num_controls = num_controls; + map->num_fds = num_devices; + map->main_fd = device_fds[0]; + + for (control = 0; control < num_controls; control++) { + unsigned long num; + int dev; + if (fscanf(f, "0x%lx: %d\n", &num, &dev) != 2) { + perr("could not parse control"); + goto free_map; + } + if ((dev < 0) || (dev >= num_devices)) { + perr("device out of range"); + goto free_map; + } + map->map[control].control = num; + map->map[control].fd = device_fds[dev]; + } + if (fscanf(f, "%s", buf) > 0) { + perr("junk at end of file"); + goto free_map; + } + + res = v4l2_open_pipeline(map, v4l2_flags); + + if (res < 0) { +free_map: + free(map); +close_devices: + for (dev = 0; dev < num_devices; dev++) + close(device_fds[dev]); + } +free_devices: + for (dev = 0; dev < num_devices; dev++) { + free(device_names[dev]); + } +close: + fclose(f); +err: + return res; +} + diff --git a/lib/libv4lconvert/control/libv4lcontrol.c b/lib/libv4lconvert/control/libv4lcontrol.c index 59f28b1..c1e6f93 100644 --- a/lib/libv4lconvert/control/libv4lcontrol.c +++ b/lib/libv4lconvert/control/libv4lcontrol.c @@ -863,6 +863,7 @@ int v4lcontrol_vidioc_queryctrl(struct v4lcontrol_data *data, void *arg) struct v4l2_queryctrl *ctrl = arg; int retval; uint32_t orig_id = ctrl->id; + int fd; /* if we have an exact match return it */ for (i = 0; i < V4LCONTROL_COUNT; i++) @@ -872,8 +873,9 @@ int v4lcontrol_vidioc_queryctrl(struct v4lcontrol_data *data, void *arg) return 0; } + fd = v4l2_get_fd_for_control(data->fd, ctrl->id); /* find out what the kernel driver would respond. */ - retval = data->dev_ops->ioctl(data->dev_ops_priv, data->fd, + retval = data->dev_ops->ioctl(data->dev_ops_priv, fd, VIDIOC_QUERYCTRL, arg); if ((data->priv_flags & V4LCONTROL_SUPPORTS_NEXT_CTRL) && @@ -903,6 +905,7 @@ int v4lcontrol_vidioc_g_ctrl(struct v4lcontrol_data *data, void *arg) { int i; struct v4l2_control *ctrl = arg; + int fd; for (i = 0; i < V4LCONTROL_COUNT; i++) if ((data->controls & (1 << i)) && @@ -911,7 +914,8 @@ int v4lcontrol_vidioc_g_ctrl(struct v4lcontrol_data *data, void *arg) return 0; } - return data->dev_ops->ioctl(data->dev_ops_priv, data->fd, + fd = v4l2_get_fd_for_control(data->fd, ctrl->id); + return data->dev_ops->ioctl(data->dev_ops_priv, fd, VIDIOC_G_CTRL, arg); } @@ -994,6 +998,7 @@ int v4lcontrol_vidioc_s_ctrl(struct v4lcontrol_data *data, void *arg) { int i; struct v4l2_control *ctrl = arg; + int fd; for (i = 0; i < V4LCONTROL_COUNT; i++) if ((data->controls & (1 << i)) && @@ -1008,7 +1013,8 @@ int v4lcontrol_vidioc_s_ctrl(struct v4lcontrol_data *data, void *arg) return 0; } - return data->dev_ops->ioctl(data->dev_ops_priv, data->fd, + fd = v4l2_get_fd_for_control(data->fd, ctrl->id); + return data->dev_ops->ioctl(data->dev_ops_priv, fd, VIDIOC_S_CTRL, arg); }