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v4l2: list available formats 

Make use of the experimental framesize enumeration ioctl if available.
This commit is contained in:
Luca Barbato 2011-12-27 06:31:41 +01:00
parent cd2bbad303
commit a6a4793d04
3 changed files with 96 additions and 8 deletions
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3
configure vendored
View File

@ -1135,6 +1135,7 @@ HAVE_LIST="
struct_sockaddr_in6
struct_sockaddr_sa_len
struct_sockaddr_storage
struct_v4l2_frmivalenum_discrete
symver
symver_asm_label
symver_gnu_asm
@ -2993,6 +2994,8 @@ texi2html -version > /dev/null 2>&1 && enable texi2html || disable texi2html
check_header linux/fb.h
check_header linux/videodev.h
check_header linux/videodev2.h
check_struct linux/videodev2.h "struct v4l2_frmivalenum" discrete
check_header sys/videoio.h
check_func_headers "windows.h vfw.h" capCreateCaptureWindow "$vfwcap_indev_extralibs"

2
doc/indevs.texi
View File

@ -267,7 +267,7 @@ the device.
Video4Linux and Video4Linux2 devices only support a limited set of
@var{width}x@var{height} sizes and framerates. You can check which are
supported for example with the command @file{dov4l} for Video4Linux
devices and the command @file{v4l-info} for Video4Linux2 devices.
devices and using @command{-list_formats all} for Video4Linux2 devices.
If the size for the device is set to 0x0, the input device will
try to autodetect the size to use.

99
libavdevice/v4l2.c
View File

@ -51,6 +51,10 @@
static const int desired_video_buffers = 256;
#define V4L_ALLFORMATS 3
#define V4L_RAWFORMATS 1
#define V4L_COMPFORMATS 2
struct video_data {
AVClass *class;
int fd;
@ -65,8 +69,10 @@ struct video_data {
unsigned int *buf_len;
char *standard;
int channel;
char *video_size; /**< String describing video size, set by a private option. */
char *video_size; /**< String describing video size,
set by a private option. */
char *pixel_format; /**< Set by a private option. */
int list_format; /**< Set by a private option. */
char *framerate; /**< Set by a private option. */
};
@ -258,6 +264,69 @@ static enum CodecID fmt_v4l2codec(uint32_t v4l2_fmt)
return CODEC_ID_NONE;
}
#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat)
{
struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
while(!ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
switch (vfse.type) {
case V4L2_FRMSIZE_TYPE_DISCRETE:
av_log(ctx, AV_LOG_INFO, " %ux%u",
vfse.discrete.width, vfse.discrete.height);
break;
case V4L2_FRMSIZE_TYPE_CONTINUOUS:
case V4L2_FRMSIZE_TYPE_STEPWISE:
av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
vfse.stepwise.min_width,
vfse.stepwise.max_width,
vfse.stepwise.step_width,
vfse.stepwise.min_height,
vfse.stepwise.max_height,
vfse.stepwise.step_height);
}
vfse.index++;
}
}
#endif
static void list_formats(AVFormatContext *ctx, int fd, int type)
{
struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
while(!ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) {
enum CodecID codec_id = fmt_v4l2codec(vfd.pixelformat);
enum PixelFormat pix_fmt = fmt_v4l2ff(vfd.pixelformat, codec_id);
vfd.index++;
if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
type & V4L_RAWFORMATS) {
const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
av_log(ctx, AV_LOG_INFO, "R : %9s : %20s :",
fmt_name ? fmt_name : "Unsupported",
vfd.description);
} else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
type & V4L_COMPFORMATS) {
AVCodec *codec = avcodec_find_encoder(codec_id);
av_log(ctx, AV_LOG_INFO, "C : %9s : %20s :",
codec ? codec->name : "Unsupported",
vfd.description);
} else {
continue;
}
if (vfd.flags & V4L2_FMT_FLAG_EMULATED) {
av_log(ctx, AV_LOG_WARNING, "%s", "Emulated");
continue;
}
#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
list_framesizes(ctx, fd, vfd.pixelformat);
#endif
av_log(ctx, AV_LOG_INFO, "\n");
}
}
static int mmap_init(AVFormatContext *ctx)
{
struct video_data *s = ctx->priv_data;
@ -621,6 +690,12 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
goto out;
}
if (s->list_format) {
list_formats(s1, s->fd, s->list_format);
res = AVERROR_EXIT;
goto out;
}
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
if (s->video_size &&
@ -629,12 +704,18 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
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);
res = AVERROR(EINVAL);
goto out;
if (s->pixel_format) {
pix_fmt = av_get_pix_fmt(s->pixel_format);
if (pix_fmt == PIX_FMT_NONE) {
av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n",
s->pixel_format);
res = AVERROR(EINVAL);
goto out;
}
}
if (!s->width && !s->height) {
@ -737,6 +818,10 @@ static const AVOption options[] = {
{ "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 },
{ "list_formats", "List available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, DEC, "list_formats" },
{ "all", "Show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" },
{ "raw", "Show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" },
{ "compressed", "Show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" },
{ NULL },
};