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Code refactoring for v4l2 device

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This commit is contained in:
Alex X
2025-01-09 07:18:36 +03:00
parent 879ef603fe
commit 773e415dff
2 changed files with 17 additions and 15 deletions
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pkg/v4l2/device/README.md
+7 -5
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@@ -1,3 +1,5 @@
# Video For Linux Two
Build on Ubuntu
```bash
@@ -7,11 +9,11 @@ sudo apt install gcc-aarch64-linux-gnu binutils
sudo apt install gcc-arm-linux-gnueabihf
sudo apt install gcc-mipsel-linux-gnu
x86_64-linux-gnu-gcc -w -static arch.c -o arch_x86_64
i686-linux-gnu-gcc -w -static arch.c -o arch_i686
aarch64-linux-gnu-gcc -w -static arch.c -o arch_aarch64
arm-linux-gnueabihf-gcc -w -static arch.c -o arch_armhf
mipsel-linux-gnu-gcc -static arch.c -o arch_mipsel
x86_64-linux-gnu-gcc -w -static videodev2_arch.c -o videodev2_x86_64
i686-linux-gnu-gcc -w -static videodev2_arch.c -o videodev2_i686
aarch64-linux-gnu-gcc -w -static videodev2_arch.c -o videodev2_aarch64
arm-linux-gnueabihf-gcc -w -static videodev2_arch.c -o videodev2_armhf
mipsel-linux-gnu-gcc -w -static videodev2_arch.c -o videodev2_mipsel
```
## Useful links
pkg/v4l2/device/arch.c → pkg/v4l2/device/videodev2_arch.c
+10 -10
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@@ -7,8 +7,8 @@
#define printstruct(str) printf("type %s struct { // size %lu\n", #str, sizeof(struct str))
#define printmember(str, mem, typ) printf("\t%s %s // offset %lu, size %lu\n", #mem == "type" ? "typ" : #mem, typ, offsetof(struct str, mem), sizeof((struct str){0}.mem))
#define printunimem(str, uni, mem, typ) printf("\t%s %s // offset %lu, size %lu\n", #mem, typ, offsetof(struct str, uni.mem), sizeof((struct str){0}.uni.mem))
#define printalign1(str, mem2, mem1, siz1) printf("\t_ [%lu]byte // align\n", offsetof(struct str, mem2) - offsetof(struct str, mem1) - siz1)
#define printfiller(str, mem1, siz1) printf("\t_ [%lu]byte // filler\n", sizeof(struct str) - offsetof(struct str, mem1) - siz1)
#define printalign1(str, mem2, mem1) printf("\t_ [%lu]byte // align\n", offsetof(struct str, mem2) - offsetof(struct str, mem1) - sizeof((struct str){0}.mem1))
#define printfiller(str, mem) printf("\t_ [%lu]byte // filler\n", sizeof(struct str) - offsetof(struct str, mem) - sizeof((struct str){0}.mem))
int main() {
printf("const (\n");
@@ -51,9 +51,9 @@ int main() {
printstruct(v4l2_format);
printmember(v4l2_format, type, "uint32");
printalign1(v4l2_format, fmt, type, 4);
printalign1(v4l2_format, fmt, type);
printunimem(v4l2_format, fmt, pix, "v4l2_pix_format");
printfiller(v4l2_format, fmt, sizeof(struct v4l2_pix_format));
printfiller(v4l2_format, fmt.pix);
printf("}\n\n");
printstruct(v4l2_pix_format);
@@ -74,7 +74,7 @@ int main() {
printstruct(v4l2_streamparm);
printmember(v4l2_streamparm, type, "uint32");
printunimem(v4l2_streamparm, parm, capture, "v4l2_captureparm");
printfiller(v4l2_streamparm, parm, sizeof(struct v4l2_captureparm));
printfiller(v4l2_streamparm, parm.capture);
printf("}\n\n");
printstruct(v4l2_captureparm);
@@ -106,14 +106,14 @@ int main() {
printmember(v4l2_buffer, bytesused, "uint32");
printmember(v4l2_buffer, flags, "uint32");
printmember(v4l2_buffer, field, "uint32");
printalign1(v4l2_buffer, timecode, field, 4);
printalign1(v4l2_buffer, timecode, field);
printmember(v4l2_buffer, timecode, "v4l2_timecode");
printmember(v4l2_buffer, sequence, "uint32");
printmember(v4l2_buffer, memory, "uint32");
printunimem(v4l2_buffer, m, offset, "uint32");
printalign1(v4l2_buffer, length, m, 4);
printalign1(v4l2_buffer, length, m.offset);
printmember(v4l2_buffer, length, "uint32");
printfiller(v4l2_buffer, length, 4);
printfiller(v4l2_buffer, length);
printf("}\n\n");
printstruct(v4l2_timecode);
@@ -141,7 +141,7 @@ int main() {
printmember(v4l2_frmsizeenum, pixel_format, "uint32");
printmember(v4l2_frmsizeenum, type, "uint32");
printmember(v4l2_frmsizeenum, discrete, "v4l2_frmsize_discrete");
printfiller(v4l2_frmsizeenum, discrete, sizeof(struct v4l2_frmsize_discrete));
printfiller(v4l2_frmsizeenum, discrete);
printf("}\n\n");
printstruct(v4l2_frmsize_discrete);
@@ -156,7 +156,7 @@ int main() {
printmember(v4l2_frmivalenum, height, "uint32");
printmember(v4l2_frmivalenum, type, "uint32");
printmember(v4l2_frmivalenum, discrete, "v4l2_fract");
printfiller(v4l2_frmivalenum, discrete, sizeof(struct v4l2_fract));
printfiller(v4l2_frmivalenum, discrete);
printf("}\n\n");
return 0;