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v4l2: cosmetics

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pull/3/head
Luca Barbato 13 years ago
parent 21aa6ae4fb
commit a896d7f45a
1 changed files with 94 additions and 45 deletions
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  1. 139
      libavdevice/v4l2.c

139
libavdevice/v4l2.c
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@ -117,10 +117,11 @@ static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
flags |= O_NONBLOCK;
}
fd = 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));
ctx->filename, strerror(errno));
return AVERROR(errno);
}
@ -128,11 +129,14 @@ static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
res = 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");
av_log(ctx, AV_LOG_ERROR,
"QUERYCAP not implemented, probably V4L device but "
"not supporting V4L2\n");
close(fd);
return AVERROR(515);
}
if (res < 0) {
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
strerror(errno));
@ -140,39 +144,52 @@ static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
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;
return fd;
}
static int device_init(AVFormatContext *ctx, int *width, int *height, uint32_t pix_fmt)
static int device_init(AVFormatContext *ctx, int *width, int *height,
uint32_t pix_fmt)
{
struct video_data *s = ctx->priv_data;
int fd = s->fd;
struct v4l2_format fmt;
struct v4l2_pix_format *pix = &fmt.fmt.pix;
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_ANY;
pix->width = *width;
pix->height = *height;
pix->pixelformat = pix_fmt;
pix->field = V4L2_FIELD_ANY;
res = 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);
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;
*height = fmt.fmt.pix.height;
}
if (pix_fmt != fmt.fmt.pix.pixelformat) {
av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver changed the pixel format from 0x%08X to 0x%08X\n", pix_fmt, fmt.fmt.pix.pixelformat);
av_log(ctx, AV_LOG_DEBUG,
"The V4L2 driver changed the pixel format "
"from 0x%08X to 0x%08X\n",
pix_fmt, fmt.fmt.pix.pixelformat);
res = -1;
}
@ -300,12 +317,16 @@ static int mmap_init(AVFormatContext *ctx)
s->buf_len[i] = buf.length;
if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
av_log(ctx, AV_LOG_ERROR, "Buffer len [%d] = %d != %d\n", i, s->buf_len[i], s->frame_size);
av_log(ctx, AV_LOG_ERROR,
"Buffer len [%d] = %d != %d\n",
i, s->buf_len[i], s->frame_size);
return -1;
}
s->buf_start[i] = mmap (NULL, buf.length,
PROT_READ | PROT_WRITE, MAP_SHARED, s->fd, buf.m.offset);
s->buf_start[i] = 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));
@ -327,9 +348,8 @@ static void mmap_release_buffer(AVPacket *pkt)
int res, fd;
struct buff_data *buf_descriptor = pkt->priv;
if (pkt->data == NULL) {
return;
}
if (pkt->data == NULL)
return;
memset(&buf, 0, sizeof(struct v4l2_buffer));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@ -339,9 +359,10 @@ static void mmap_release_buffer(AVPacket *pkt)
av_free(buf_descriptor);
res = ioctl(fd, VIDIOC_QBUF, &buf);
if (res < 0) {
av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno));
}
if (res < 0)
av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
strerror(errno));
pkt->data = NULL;
pkt->size = 0;
}
@ -365,13 +386,16 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
return AVERROR(EAGAIN);
}
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", strerror(errno));
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
strerror(errno));
return AVERROR(errno);
}
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);
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;
}
@ -419,7 +443,8 @@ 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));
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
strerror(errno));
return AVERROR(errno);
}
@ -428,7 +453,8 @@ static int mmap_start(AVFormatContext *ctx)
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
res = ioctl(s->fd, VIDIOC_STREAMON, &type);
if (res < 0) {
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", strerror(errno));
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
strerror(errno));
return AVERROR(errno);
}
@ -465,8 +491,10 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (s->framerate && (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
if (s->framerate &&
(ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
s->framerate);
return ret;
}
@ -481,7 +509,8 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
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) {
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set input(%d) failed\n",
av_log(s1, AV_LOG_ERROR,
"The V4L2 driver ioctl set input(%d) failed\n",
s->channel);
return AVERROR(EIO);
}
@ -494,7 +523,8 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
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",
av_log(s1, AV_LOG_ERROR,
"The V4L2 driver ioctl set standard(%s) failed\n",
s->standard);
return AVERROR(EIO);
}
@ -504,10 +534,12 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
}
}
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
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) {
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
av_log(s1, AV_LOG_ERROR,
"The V4L2 driver ioctl set standard(%s) failed\n",
s->standard);
return AVERROR(EIO);
}
@ -518,6 +550,7 @@ 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) {
av_log(s1, AV_LOG_ERROR,
"ioctl set time per frame(%d/%d) failed\n",
@ -528,14 +561,15 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
if (framerate_q.num != tpf->denominator ||
framerate_q.den != tpf->numerator) {
av_log(s1, AV_LOG_INFO,
"The driver changed the time per frame from %d/%d to %d/%d\n",
"The driver changed the time per frame from "
"%d/%d to %d/%d\n",
framerate_q.den, framerate_q.num,
tpf->numerator, tpf->denominator);
}
} else {
/* if timebase value is not set, read the timebase value from the driver */
if (ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n", strerror(errno));
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n",
strerror(errno));
return AVERROR(errno);
}
}
@ -569,6 +603,7 @@ static uint32_t device_try_init(AVFormatContext *s1,
}
}
}
if (desired_format != 0) {
*codec_id = fmt_v4l2codec(desired_format);
assert(*codec_id != CODEC_ID_NONE);
@ -582,7 +617,7 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
struct video_data *s = s1->priv_data;
AVStream *st;
int res = 0;
uint32_t desired_format, capabilities;
uint32_t desired_format, capabilities = 0;
enum CodecID codec_id;
enum PixelFormat pix_fmt = PIX_FMT_NONE;
@ -591,19 +626,23 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
res = AVERROR(ENOMEM);
goto out;
}
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
if (s->video_size && (res = av_parse_video_size(&s->width, &s->height, s->video_size)) < 0) {
av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n", s->video_size);
if (s->video_size &&
(res = av_parse_video_size(&s->width, &s->height, s->video_size)) < 0) {
av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n",
s->video_size);
goto out;
}
if (s->pixel_format && (pix_fmt = av_get_pix_fmt(s->pixel_format)) == PIX_FMT_NONE) {
av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n", s->pixel_format);
if (s->pixel_format &&
(pix_fmt = av_get_pix_fmt(s->pixel_format)) == PIX_FMT_NONE) {
av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n",
s->pixel_format);
res = AVERROR(EINVAL);
goto out;
}
capabilities = 0;
s->fd = device_open(s1, &capabilities);
if (s->fd < 0) {
res = AVERROR(EIO);
@ -614,19 +653,24 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
if (!s->width && !s->height) {
struct v4l2_format fmt;
av_log(s1, AV_LOG_VERBOSE, "Querying the device for the current frame size\n");
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) {
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", strerror(errno));
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
strerror(errno));
res = AVERROR(errno);
goto out;
}
s->width = fmt.fmt.pix.width;
s->height = fmt.fmt.pix.height;
av_log(s1, AV_LOG_VERBOSE, "Setting frame size to %dx%d\n", s->width, s->height);
av_log(s1, AV_LOG_VERBOSE,
"Setting frame size to %dx%d\n", s->width, s->height);
}
desired_format = device_try_init(s1, pix_fmt, &s->width, &s->height, &codec_id);
desired_format = device_try_init(s1, pix_fmt, &s->width, &s->height,
&codec_id);
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);
@ -635,15 +679,19 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
res = AVERROR(EIO);
goto out;
}
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))
goto out;
st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id);
s->frame_size = avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
s->frame_size =
avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
if (capabilities & V4L2_CAP_STREAMING) {
s->io_method = io_mmap;
res = mmap_init(s1);
@ -675,6 +723,7 @@ out:
static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
struct video_data *s = s1->priv_data;
AVFrame *frame = s1->streams[0]->codec->coded_frame;
int res;
if (s->io_method == io_mmap) {
@ -692,9 +741,9 @@ static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
return res;
}
if (s1->streams[0]->codec->coded_frame && s->interlaced) {
s1->streams[0]->codec->coded_frame->interlaced_frame = 1;
s1->streams[0]->codec->coded_frame->top_field_first = s->top_field_first;
if (frame && s->interlaced) {
frame->interlaced_frame = 1;
frame->top_field_first = s->top_field_first;
}
return pkt->size;

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