videolan/ffmpeg
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convert if then else video palette to pix_fmt construct to simpiler table based lookup.

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Originally committed as revision 9202 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Marc Hoffman 2007-06-04 13:25:29 +00:00
parent 37dfd6333d
commit c7c64e9e5e
1 changed files with 37 additions and 47 deletions
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84
libavformat/grab.c
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@ -53,6 +53,19 @@ typedef struct {
uint8_t *lum_m4_mem;
} VideoData;
struct {
int palette;
int depth;
enum PixelFormat pix_fmt;
} video_formats [] = {
{.palette = VIDEO_PALETTE_YUV420P, .depth = 12, .pix_fmt = PIX_FMT_YUV420P },
{.palette = VIDEO_PALETTE_YUV422, .depth = 16, .pix_fmt = PIX_FMT_YUYV422 },
/* NOTE: v4l uses BGR24, not RGB24 */
{.palette = VIDEO_PALETTE_RGB24, .depth = 24, .pix_fmt = PIX_FMT_BGR24 },
{.palette = VIDEO_PALETTE_GREY, .depth = 8, .pix_fmt = PIX_FMT_GRAY8 },
};
static int aiw_init(VideoData *s);
static int aiw_read_picture(VideoData *s, uint8_t *data);
static int aiw_close(VideoData *s);
@ -69,6 +82,7 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
struct video_audio audio;
struct video_picture pict;
int j;
int vformat_num = sizeof(video_formats) / sizeof(video_formats[0]);
if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0) {
av_log(s1, AV_LOG_ERROR, "Bad capture size (%dx%d) or wrong time base (%d)\n",
@ -117,15 +131,12 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
desired_palette = -1;
desired_depth = -1;
if (ap->pix_fmt == PIX_FMT_YUV420P) {
desired_palette = VIDEO_PALETTE_YUV420P;
desired_depth = 12;
} else if (ap->pix_fmt == PIX_FMT_YUYV422) {
desired_palette = VIDEO_PALETTE_YUV422;
desired_depth = 16;
} else if (ap->pix_fmt == PIX_FMT_BGR24) {
desired_palette = VIDEO_PALETTE_RGB24;
desired_depth = 24;
for (j = 0; j < vformat_num; j++) {
if (ap->pix_fmt == video_formats[j].pix_fmt) {
desired_palette = video_formats[j].palette;
desired_depth = video_formats[j].depth;
break;
}
}
/* set tv standard */
@ -159,26 +170,14 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
pict.palette = desired_palette;
pict.depth= desired_depth;
if (desired_palette == -1 || (ret = ioctl(video_fd, VIDIOCSPICT, &pict)) < 0) {
pict.palette=VIDEO_PALETTE_YUV420P;
pict.depth=12;
ret = ioctl(video_fd, VIDIOCSPICT, &pict);
if (ret < 0) {
pict.palette=VIDEO_PALETTE_YUV422;
pict.depth=16;
ret = ioctl(video_fd, VIDIOCSPICT, &pict);
if (ret < 0) {
pict.palette=VIDEO_PALETTE_RGB24;
pict.depth=24;
ret = ioctl(video_fd, VIDIOCSPICT, &pict);
if (ret < 0) {
pict.palette=VIDEO_PALETTE_GREY;
pict.depth=8;
ret = ioctl(video_fd, VIDIOCSPICT, &pict);
if (ret < 0)
goto fail1;
}
}
for (j = 0; j < vformat_num; j++) {
pict.palette = video_formats[j].palette;
pict.depth = video_formats[j].depth;
if (-1 != ioctl(video_fd, VIDIOCSPICT, &pict))
break;
}
if (j >= vformat_num)
goto fail1;
}
ret = ioctl(video_fd,VIDIOCGMBUF,&s->gb_buffers);
@ -249,26 +248,17 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
s->use_mmap = 1;
}
switch(s->frame_format) {
case VIDEO_PALETTE_YUV420P:
frame_size = (width * height * 3) / 2;
st->codec->pix_fmt = PIX_FMT_YUV420P;
break;
case VIDEO_PALETTE_YUV422:
frame_size = width * height * 2;
st->codec->pix_fmt = PIX_FMT_YUYV422;
break;
case VIDEO_PALETTE_RGB24:
frame_size = width * height * 3;
st->codec->pix_fmt = PIX_FMT_BGR24; /* NOTE: v4l uses BGR24, not RGB24 ! */
break;
case VIDEO_PALETTE_GREY:
frame_size = width * height * 1;
st->codec->pix_fmt = PIX_FMT_GRAY8;
break;
default:
goto fail;
for (j = 0; j < vformat_num; j++) {
if (s->frame_format == video_formats[j].palette) {
frame_size = width * height * video_formats[j].depth / 8;
st->codec->pix_fmt = video_formats[j].pix_fmt;
break;
}
}
if (j >= vformat_num)
goto fail;
s->fd = video_fd;
s->frame_size = frame_size;