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Diffstat (limited to 'libavdevice/v4l2.c')
-rw-r--r--libavdevice/v4l2.c177
1 files changed, 91 insertions, 86 deletions
diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c
index 0c61f46b53..dc54c4a205 100644
--- a/libavdevice/v4l2.c
+++ b/libavdevice/v4l2.c
@@ -1,35 +1,37 @@
/*
- * Video4Linux2 grab interface
* Copyright (c) 2000,2001 Fabrice Bellard
* Copyright (c) 2006 Luca Abeni
*
- * Part of this file is based on the V4L2 video capture example
- * (http://v4l2spec.bytesex.org/v4l2spec/capture.c)
- *
- * Thanks to Michael Niedermayer for providing the mapping between
- * V4L2_PIX_FMT_* and PIX_FMT_*
+ * This file is part of FFmpeg.
*
- *
- * This file is part of Libav.
- *
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+/**
+ * @file
+ * Video4Linux2 grab interface
+ *
+ * Part of this file is based on the V4L2 video capture example
+ * (http://v4l2spec.bytesex.org/v4l2spec/capture.c)
+ *
+ * Thanks to Michael Niedermayer for providing the mapping between
+ * V4L2_PIX_FMT_* and PIX_FMT_*
+ */
+
#undef __STRICT_ANSI__ //workaround due to broken kernel headers
#include "config.h"
-#include "libavformat/avformat.h"
#include "libavformat/internal.h"
#include <unistd.h>
#include <fcntl.h>
@@ -46,10 +48,23 @@
#include "libavutil/imgutils.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
+#include "avdevice.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/avstring.h"
+#if CONFIG_LIBV4L2
+#include <libv4l2.h>
+#else
+#define v4l2_open open
+#define v4l2_close close
+#define v4l2_dup dup
+#define v4l2_ioctl ioctl
+#define v4l2_read read
+#define v4l2_mmap mmap
+#define v4l2_munmap munmap
+#endif
+
static const int desired_video_buffers = 256;
enum io_method {
@@ -111,39 +126,49 @@ static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
{
struct v4l2_capability cap;
int fd;
+#if CONFIG_LIBV4L2
+ int fd_libv4l;
+#endif
int res, err;
int flags = O_RDWR;
if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
flags |= O_NONBLOCK;
}
- fd = open(ctx->filename, flags, 0);
+ fd = v4l2_open(ctx->filename, flags, 0);
if (fd < 0) {
av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
ctx->filename, strerror(errno));
-
return AVERROR(errno);
}
+#if CONFIG_LIBV4L2
+ fd_libv4l = v4l2_fd_open(fd, 0);
+ if (fd < 0) {
+ err = AVERROR(errno);
+ av_log(ctx, AV_LOG_ERROR, "Cannot open video device with libv4l neither %s : %s\n",
+ ctx->filename, strerror(errno));
+ return err;
+ }
+ fd = fd_libv4l;
+#endif
- res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
+ res = v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap);
// ENOIOCTLCMD definition only availble on __KERNEL__
if (res < 0 && ((err = errno) == 515)) {
av_log(ctx, AV_LOG_ERROR, "QUERYCAP not implemented, probably V4L device but not supporting V4L2\n");
- close(fd);
+ v4l2_close(fd);
return AVERROR(515);
}
if (res < 0) {
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
strerror(errno));
- close(fd);
-
+ v4l2_close(fd);
return AVERROR(err);
}
if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) {
av_log(ctx, AV_LOG_ERROR, "Not a video capture device\n");
- close(fd);
-
+ v4l2_close(fd);
return AVERROR(ENODEV);
}
*capabilities = cap.capabilities;
@@ -155,16 +180,15 @@ static int device_init(AVFormatContext *ctx, int *width, int *height, uint32_t p
{
struct video_data *s = ctx->priv_data;
int fd = s->fd;
- struct v4l2_format fmt;
+ struct v4l2_format fmt = {0};
int res;
- memset(&fmt, 0, sizeof(struct v4l2_format));
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
fmt.fmt.pix.pixelformat = pix_fmt;
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
- res = ioctl(fd, VIDIOC_S_FMT, &fmt);
+ res = v4l2_ioctl(fd, VIDIOC_S_FMT, &fmt);
if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
av_log(ctx, AV_LOG_INFO, "The V4L2 driver changed the video from %dx%d to %dx%d\n", *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
*width = fmt.fmt.pix.width;
@@ -184,7 +208,7 @@ static int first_field(int fd)
int res;
v4l2_std_id std;
- res = ioctl(fd, VIDIOC_G_STD, &std);
+ res = v4l2_ioctl(fd, VIDIOC_G_STD, &std);
if (res < 0) {
return 0;
}
@@ -241,55 +265,48 @@ static enum CodecID fmt_v4l2codec(uint32_t v4l2_fmt)
static int mmap_init(AVFormatContext *ctx)
{
struct video_data *s = ctx->priv_data;
- struct v4l2_requestbuffers req;
+ struct v4l2_requestbuffers req = {0};
int i, res;
- memset(&req, 0, sizeof(struct v4l2_requestbuffers));
req.count = desired_video_buffers;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
- res = ioctl(s->fd, VIDIOC_REQBUFS, &req);
+ res = v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req);
if (res < 0) {
if (errno == EINVAL) {
av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n");
} else {
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
}
-
return AVERROR(errno);
}
if (req.count < 2) {
av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
-
return AVERROR(ENOMEM);
}
s->buffers = req.count;
s->buf_start = av_malloc(sizeof(void *) * s->buffers);
if (s->buf_start == NULL) {
av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
-
return AVERROR(ENOMEM);
}
s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
if (s->buf_len == NULL) {
av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
av_free(s->buf_start);
-
return AVERROR(ENOMEM);
}
for (i = 0; i < req.count; i++) {
- struct v4l2_buffer buf;
+ struct v4l2_buffer buf = {0};
- memset(&buf, 0, sizeof(struct v4l2_buffer));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
- res = ioctl(s->fd, VIDIOC_QUERYBUF, &buf);
+ res = v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf);
if (res < 0) {
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
-
return AVERROR(errno);
}
@@ -299,11 +316,10 @@ static int mmap_init(AVFormatContext *ctx)
return -1;
}
- s->buf_start[i] = mmap (NULL, buf.length,
+ s->buf_start[i] = v4l2_mmap(NULL, buf.length,
PROT_READ | PROT_WRITE, MAP_SHARED, s->fd, buf.m.offset);
if (s->buf_start[i] == MAP_FAILED) {
av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
-
return AVERROR(errno);
}
}
@@ -318,7 +334,7 @@ static int read_init(AVFormatContext *ctx)
static void mmap_release_buffer(AVPacket *pkt)
{
- struct v4l2_buffer buf;
+ struct v4l2_buffer buf = {0};
int res, fd;
struct buff_data *buf_descriptor = pkt->priv;
@@ -326,14 +342,13 @@ static void mmap_release_buffer(AVPacket *pkt)
return;
}
- memset(&buf, 0, sizeof(struct v4l2_buffer));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = buf_descriptor->index;
fd = buf_descriptor->fd;
av_free(buf_descriptor);
- res = ioctl(fd, VIDIOC_QBUF, &buf);
+ res = v4l2_ioctl(fd, VIDIOC_QBUF, &buf);
if (res < 0) {
av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno));
}
@@ -344,30 +359,27 @@ static void mmap_release_buffer(AVPacket *pkt)
static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
{
struct video_data *s = ctx->priv_data;
- struct v4l2_buffer buf;
+ struct v4l2_buffer buf = {0};
struct buff_data *buf_descriptor;
int res;
- memset(&buf, 0, sizeof(struct v4l2_buffer));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
/* FIXME: Some special treatment might be needed in case of loss of signal... */
- while ((res = ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
+ while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
if (res < 0) {
if (errno == EAGAIN) {
pkt->size = 0;
-
return AVERROR(EAGAIN);
}
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", strerror(errno));
return AVERROR(errno);
}
- assert (buf.index < s->buffers);
+ assert(buf.index < s->buffers);
if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
av_log(ctx, AV_LOG_ERROR, "The v4l2 frame is %d bytes, but %d bytes are expected\n", buf.bytesused, s->frame_size);
-
return AVERROR_INVALIDDATA;
}
@@ -382,7 +394,7 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
* allocate a buffer for memcopying into it
*/
av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
- res = ioctl(s->fd, VIDIOC_QBUF, &buf);
+ res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf);
return AVERROR(ENOMEM);
}
@@ -405,26 +417,23 @@ static int mmap_start(AVFormatContext *ctx)
int i, res;
for (i = 0; i < s->buffers; i++) {
- struct v4l2_buffer buf;
+ struct v4l2_buffer buf = {0};
- memset(&buf, 0, sizeof(struct v4l2_buffer));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
- res = ioctl(s->fd, VIDIOC_QBUF, &buf);
+ res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf);
if (res < 0) {
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno));
-
return AVERROR(errno);
}
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- res = ioctl(s->fd, VIDIOC_STREAMON, &type);
+ res = v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type);
if (res < 0) {
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", strerror(errno));
-
return AVERROR(errno);
}
@@ -440,9 +449,9 @@ static void mmap_close(struct video_data *s)
/* We do not check for the result, because we could
* not do anything about it anyway...
*/
- ioctl(s->fd, VIDIOC_STREAMOFF, &type);
+ v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type);
for (i = 0; i < s->buffers; i++) {
- munmap(s->buf_start[i], s->buf_len[i]);
+ v4l2_munmap(s->buf_start[i], s->buf_len[i]);
}
av_free(s->buf_start);
av_free(s->buf_len);
@@ -451,12 +460,12 @@ static void mmap_close(struct video_data *s)
static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
{
struct video_data *s = s1->priv_data;
- struct v4l2_input input;
- struct v4l2_standard standard;
- struct v4l2_streamparm streamparm = { 0 };
+ struct v4l2_input input = {0};
+ struct v4l2_standard standard = {0};
+ struct v4l2_streamparm streamparm = {0};
struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe;
int i, ret;
- AVRational framerate_q;
+ AVRational framerate_q={0};
streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@@ -466,16 +475,15 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
}
/* set tv video input */
- memset (&input, 0, sizeof (input));
input.index = s->channel;
- if (ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
+ if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n");
return AVERROR(EIO);
}
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n",
s->channel, input.name);
- if (ioctl(s->fd, VIDIOC_S_INPUT, &input.index) < 0) {
+ if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &input.index) < 0) {
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set input(%d) failed\n",
s->channel);
return AVERROR(EIO);
@@ -485,23 +493,20 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
s->standard);
/* set tv standard */
- memset (&standard, 0, sizeof (standard));
- for(i=0;;i++) {
+ for (i = 0;; i++) {
standard.index = i;
- if (ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
- av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
- s->standard);
- return AVERROR(EIO);
- }
-
- if (!av_strcasecmp(standard.name, s->standard)) {
+ ret = v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard);
+ if (ret < 0 || !av_strcasecmp(standard.name, s->standard))
break;
- }
+ }
+ if (ret < 0) {
+ av_log(s1, AV_LOG_ERROR, "Unknown standard '%s'\n", s->standard);
+ return ret;
}
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
s->standard, (uint64_t)standard.id);
- if (ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
+ if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
s->standard);
return AVERROR(EIO);
@@ -513,7 +518,7 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
framerate_q.den, framerate_q.num);
tpf->numerator = framerate_q.den;
tpf->denominator = framerate_q.num;
- if (ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) {
+ if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) {
av_log(s1, AV_LOG_ERROR,
"ioctl set time per frame(%d/%d) failed\n",
framerate_q.den, framerate_q.num);
@@ -529,7 +534,7 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
}
} else {
/* if timebase value is not set, read the timebase value from the driver */
- if (ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
+ if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n", strerror(errno));
return AVERROR(errno);
}
@@ -611,7 +616,7 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
av_log(s1, AV_LOG_VERBOSE, "Querying the device for the current frame size\n");
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
+ if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", strerror(errno));
res = AVERROR(errno);
goto out;
@@ -625,16 +630,16 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
if (desired_format == 0) {
av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for "
"codec_id %d, pix_fmt %d.\n", s1->video_codec_id, pix_fmt);
- close(s->fd);
+ v4l2_close(s->fd);
res = AVERROR(EIO);
goto out;
}
- if ((res = av_image_check_size(s->width, s->height, 0, s1) < 0))
+ if ((res = av_image_check_size(s->width, s->height, 0, s1)) < 0)
goto out;
s->frame_format = desired_format;
- if ((res = v4l2_set_parameters(s1, ap) < 0))
+ if ((res = v4l2_set_parameters(s1, ap)) < 0)
goto out;
st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id);
@@ -650,8 +655,7 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
res = read_init(s1);
}
if (res < 0) {
- close(s->fd);
-
+ v4l2_close(s->fd);
res = AVERROR(EIO);
goto out;
}
@@ -703,15 +707,16 @@ static int v4l2_read_close(AVFormatContext *s1)
mmap_close(s);
}
- close(s->fd);
+ v4l2_close(s->fd);
return 0;
}
#define OFFSET(x) offsetof(struct video_data, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
+
static const AVOption options[] = {
- { "standard", "", offsetof(struct video_data, standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
- { "channel", "", offsetof(struct video_data, channel), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
+ { "standard", "", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
+ { "channel", "", OFFSET(channel), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "pixel_format", "", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
@@ -726,7 +731,7 @@ static const AVClass v4l2_class = {
};
AVInputFormat ff_v4l2_demuxer = {
- .name = "video4linux2",
+ .name = "video4linux2,v4l2",
.long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
.priv_data_size = sizeof(struct video_data),
.read_header = v4l2_read_header,