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Diffstat (limited to 'libavdevice/v4l2.c')
-rw-r--r--libavdevice/v4l2.c92
1 files changed, 36 insertions, 56 deletions
diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c
index 735d803..e14e56c 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)
+ * This file is part of FFmpeg.
*
- * Thanks to Michael Niedermayer for providing the mapping between
- * V4L2_PIX_FMT_* and PIX_FMT_*
- *
- *
- * 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 <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
@@ -46,6 +48,7 @@
#include "libavutil/imgutils.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
+#include "avdevice.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
@@ -120,7 +123,6 @@ static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
if (fd < 0) {
av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
ctx->filename, strerror(errno));
-
return AVERROR(errno);
}
@@ -136,13 +138,11 @@ static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
strerror(errno));
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);
-
return AVERROR(ENODEV);
}
*capabilities = cap.capabilities;
@@ -154,10 +154,9 @@ 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;
@@ -240,10 +239,9 @@ 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;
@@ -254,41 +252,35 @@ static int mmap_init(AVFormatContext *ctx)
} 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);
if (res < 0) {
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
-
return AVERROR(errno);
}
@@ -302,7 +294,6 @@ static int mmap_init(AVFormatContext *ctx)
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);
}
}
@@ -317,7 +308,7 @@ 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;
@@ -325,7 +316,6 @@ 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;
@@ -343,11 +333,10 @@ 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;
@@ -356,17 +345,15 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
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;
}
@@ -404,9 +391,8 @@ 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;
@@ -414,7 +400,6 @@ static int mmap_start(AVFormatContext *ctx)
res = 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);
}
}
@@ -423,7 +408,6 @@ static int mmap_start(AVFormatContext *ctx)
res = 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);
}
@@ -450,9 +434,9 @@ 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;
@@ -465,7 +449,6 @@ 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) {
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n");
@@ -484,18 +467,15 @@ 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 (!strcasecmp(standard.name, s->standard)) {
+ ret = ioctl(s->fd, VIDIOC_ENUMSTD, &standard);
+ if (ret < 0 || !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",
@@ -650,7 +630,6 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
}
if (res < 0) {
close(s->fd);
-
res = AVERROR(EIO);
goto out;
}
@@ -708,9 +687,10 @@ static int v4l2_read_close(AVFormatContext *s1)
#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 },
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