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v4l2: add a pixel_format private option.

This commit is contained in:
Anton Khirnov 2011-05-24 09:02:11 +02:00
parent 2e0e1e712a
commit d576bbf3eb
1 changed files with 15 additions and 3 deletions
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18
libavdevice/v4l2.c
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@ -47,6 +47,7 @@
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
static const int desired_video_buffers = 256;
@ -71,6 +72,7 @@ struct video_data {
char *standard;
int channel;
char *video_size; /**< String describing video size, set by a private option. */
char *pixel_format; /**< Set by a private option. */
};
struct buff_data {
@ -544,12 +546,12 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
}
static uint32_t device_try_init(AVFormatContext *s1,
const AVFormatParameters *ap,
enum PixelFormat pix_fmt,
int *width,
int *height,
enum CodecID *codec_id)
{
uint32_t desired_format = fmt_ff2v4l(ap->pix_fmt, s1->video_codec_id);
uint32_t desired_format = fmt_ff2v4l(pix_fmt, s1->video_codec_id);
if (desired_format == 0 ||
device_init(s1, width, height, desired_format) < 0) {
@ -582,6 +584,7 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
int res = 0;
uint32_t desired_format, capabilities;
enum CodecID codec_id;
enum PixelFormat pix_fmt = PIX_FMT_NONE;
st = av_new_stream(s1, 0);
if (!st) {
@ -594,11 +597,18 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
av_log(s1, AV_LOG_ERROR, "Couldn't parse video size.\n");
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 FF_API_FORMAT_PARAMETERS
if (ap->width > 0)
s->width = ap->width;
if (ap->height > 0)
s->height = ap->height;
if (ap->pix_fmt)
pix_fmt = ap->pix_fmt;
#endif
capabilities = 0;
@ -624,7 +634,7 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
av_log(s1, AV_LOG_VERBOSE, "Setting frame size to %dx%d\n", s->width, s->height);
}
desired_format = device_try_init(s1, ap, &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, ap->pix_fmt);
@ -670,6 +680,7 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
out:
av_freep(&s->video_size);
av_freep(&s->pixel_format);
return res;
}
@ -719,6 +730,7 @@ static const AVOption options[] = {
{ "standard", "", offsetof(struct video_data, standard), FF_OPT_TYPE_STRING, {.str = "NTSC" }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
{ "channel", "", offsetof(struct video_data, channel), FF_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), FF_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "pixel_format", "", OFFSET(pixel_format), FF_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ NULL },
};