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https://github.com/FFmpeg/FFmpeg.git
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v4l2: list available formats
Make use of the experimental framesize enumeration ioctl if available.
This commit is contained in:
parent
cd2bbad303
commit
a6a4793d04
3
configure
vendored
3
configure
vendored
@ -1135,6 +1135,7 @@ HAVE_LIST="
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struct_sockaddr_in6
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struct_sockaddr_sa_len
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struct_sockaddr_storage
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struct_v4l2_frmivalenum_discrete
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symver
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symver_asm_label
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symver_gnu_asm
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@ -2993,6 +2994,8 @@ texi2html -version > /dev/null 2>&1 && enable texi2html || disable texi2html
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check_header linux/fb.h
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check_header linux/videodev.h
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check_header linux/videodev2.h
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check_struct linux/videodev2.h "struct v4l2_frmivalenum" discrete
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check_header sys/videoio.h
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check_func_headers "windows.h vfw.h" capCreateCaptureWindow "$vfwcap_indev_extralibs"
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@ -267,7 +267,7 @@ the device.
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Video4Linux and Video4Linux2 devices only support a limited set of
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@var{width}x@var{height} sizes and framerates. You can check which are
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supported for example with the command @file{dov4l} for Video4Linux
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devices and the command @file{v4l-info} for Video4Linux2 devices.
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devices and using @command{-list_formats all} for Video4Linux2 devices.
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If the size for the device is set to 0x0, the input device will
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try to autodetect the size to use.
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@ -51,6 +51,10 @@
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static const int desired_video_buffers = 256;
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#define V4L_ALLFORMATS 3
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#define V4L_RAWFORMATS 1
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#define V4L_COMPFORMATS 2
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struct video_data {
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AVClass *class;
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int fd;
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@ -65,8 +69,10 @@ struct video_data {
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unsigned int *buf_len;
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char *standard;
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int channel;
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char *video_size; /**< String describing video size, set by a private option. */
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char *video_size; /**< String describing video size,
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set by a private option. */
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char *pixel_format; /**< Set by a private option. */
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int list_format; /**< Set by a private option. */
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char *framerate; /**< Set by a private option. */
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};
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@ -258,6 +264,69 @@ static enum CodecID fmt_v4l2codec(uint32_t v4l2_fmt)
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return CODEC_ID_NONE;
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}
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#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
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static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat)
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{
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struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
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while(!ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
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switch (vfse.type) {
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case V4L2_FRMSIZE_TYPE_DISCRETE:
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av_log(ctx, AV_LOG_INFO, " %ux%u",
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vfse.discrete.width, vfse.discrete.height);
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break;
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case V4L2_FRMSIZE_TYPE_CONTINUOUS:
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case V4L2_FRMSIZE_TYPE_STEPWISE:
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av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
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vfse.stepwise.min_width,
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vfse.stepwise.max_width,
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vfse.stepwise.step_width,
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vfse.stepwise.min_height,
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vfse.stepwise.max_height,
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vfse.stepwise.step_height);
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}
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vfse.index++;
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}
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}
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#endif
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static void list_formats(AVFormatContext *ctx, int fd, int type)
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{
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struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
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while(!ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) {
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enum CodecID codec_id = fmt_v4l2codec(vfd.pixelformat);
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enum PixelFormat pix_fmt = fmt_v4l2ff(vfd.pixelformat, codec_id);
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vfd.index++;
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if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
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type & V4L_RAWFORMATS) {
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const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
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av_log(ctx, AV_LOG_INFO, "R : %9s : %20s :",
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fmt_name ? fmt_name : "Unsupported",
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vfd.description);
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} else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
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type & V4L_COMPFORMATS) {
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AVCodec *codec = avcodec_find_encoder(codec_id);
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av_log(ctx, AV_LOG_INFO, "C : %9s : %20s :",
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codec ? codec->name : "Unsupported",
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vfd.description);
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} else {
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continue;
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}
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if (vfd.flags & V4L2_FMT_FLAG_EMULATED) {
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av_log(ctx, AV_LOG_WARNING, "%s", "Emulated");
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continue;
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}
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#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
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list_framesizes(ctx, fd, vfd.pixelformat);
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#endif
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av_log(ctx, AV_LOG_INFO, "\n");
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}
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}
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static int mmap_init(AVFormatContext *ctx)
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{
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struct video_data *s = ctx->priv_data;
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@ -621,6 +690,12 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
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goto out;
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}
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if (s->list_format) {
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list_formats(s1, s->fd, s->list_format);
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res = AVERROR_EXIT;
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goto out;
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}
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avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
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if (s->video_size &&
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@ -629,12 +704,18 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
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s->video_size);
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goto out;
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}
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if (s->pixel_format &&
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(pix_fmt = av_get_pix_fmt(s->pixel_format)) == PIX_FMT_NONE) {
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av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n",
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s->pixel_format);
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res = AVERROR(EINVAL);
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goto out;
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if (s->pixel_format) {
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pix_fmt = av_get_pix_fmt(s->pixel_format);
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if (pix_fmt == PIX_FMT_NONE) {
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av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n",
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s->pixel_format);
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res = AVERROR(EINVAL);
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goto out;
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}
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}
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if (!s->width && !s->height) {
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@ -737,6 +818,10 @@ static const AVOption options[] = {
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{ "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
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{ "pixel_format", "", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
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{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
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{ "list_formats", "List available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, DEC, "list_formats" },
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{ "all", "Show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" },
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{ "raw", "Show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" },
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{ "compressed", "Show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" },
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{ NULL },
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};
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