386 lines
8.5 KiB
C
386 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Copyright (C) 2005 Mike Isely <isely@pobox.com>
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*/
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#include "pvrusb2-std.h"
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#include "pvrusb2-debug.h"
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#include <asm/string.h>
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#include <linux/slab.h>
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struct std_name {
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const char *name;
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v4l2_std_id id;
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};
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#define CSTD_PAL \
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(V4L2_STD_PAL_B| \
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V4L2_STD_PAL_B1| \
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V4L2_STD_PAL_G| \
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V4L2_STD_PAL_H| \
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V4L2_STD_PAL_I| \
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V4L2_STD_PAL_D| \
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V4L2_STD_PAL_D1| \
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V4L2_STD_PAL_K| \
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V4L2_STD_PAL_M| \
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V4L2_STD_PAL_N| \
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V4L2_STD_PAL_Nc| \
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V4L2_STD_PAL_60)
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#define CSTD_NTSC \
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(V4L2_STD_NTSC_M| \
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V4L2_STD_NTSC_M_JP| \
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V4L2_STD_NTSC_M_KR| \
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V4L2_STD_NTSC_443)
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#define CSTD_ATSC \
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(V4L2_STD_ATSC_8_VSB| \
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V4L2_STD_ATSC_16_VSB)
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#define CSTD_SECAM \
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(V4L2_STD_SECAM_B| \
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V4L2_STD_SECAM_D| \
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V4L2_STD_SECAM_G| \
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V4L2_STD_SECAM_H| \
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V4L2_STD_SECAM_K| \
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V4L2_STD_SECAM_K1| \
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V4L2_STD_SECAM_L| \
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V4L2_STD_SECAM_LC)
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#define TSTD_B (V4L2_STD_PAL_B|V4L2_STD_SECAM_B)
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#define TSTD_B1 (V4L2_STD_PAL_B1)
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#define TSTD_D (V4L2_STD_PAL_D|V4L2_STD_SECAM_D)
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#define TSTD_D1 (V4L2_STD_PAL_D1)
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#define TSTD_G (V4L2_STD_PAL_G|V4L2_STD_SECAM_G)
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#define TSTD_H (V4L2_STD_PAL_H|V4L2_STD_SECAM_H)
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#define TSTD_I (V4L2_STD_PAL_I)
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#define TSTD_K (V4L2_STD_PAL_K|V4L2_STD_SECAM_K)
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#define TSTD_K1 (V4L2_STD_SECAM_K1)
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#define TSTD_L (V4L2_STD_SECAM_L)
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#define TSTD_M (V4L2_STD_PAL_M|V4L2_STD_NTSC_M)
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#define TSTD_N (V4L2_STD_PAL_N)
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#define TSTD_Nc (V4L2_STD_PAL_Nc)
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#define TSTD_60 (V4L2_STD_PAL_60)
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#define CSTD_ALL (CSTD_PAL|CSTD_NTSC|CSTD_ATSC|CSTD_SECAM)
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/* Mapping of standard bits to color system */
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static const struct std_name std_groups[] = {
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{"PAL",CSTD_PAL},
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{"NTSC",CSTD_NTSC},
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{"SECAM",CSTD_SECAM},
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{"ATSC",CSTD_ATSC},
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};
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/* Mapping of standard bits to modulation system */
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static const struct std_name std_items[] = {
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{"B",TSTD_B},
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{"B1",TSTD_B1},
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{"D",TSTD_D},
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{"D1",TSTD_D1},
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{"G",TSTD_G},
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{"H",TSTD_H},
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{"I",TSTD_I},
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{"K",TSTD_K},
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{"K1",TSTD_K1},
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{"L",TSTD_L},
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{"LC",V4L2_STD_SECAM_LC},
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{"M",TSTD_M},
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{"Mj",V4L2_STD_NTSC_M_JP},
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{"443",V4L2_STD_NTSC_443},
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{"Mk",V4L2_STD_NTSC_M_KR},
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{"N",TSTD_N},
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{"Nc",TSTD_Nc},
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{"60",TSTD_60},
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{"8VSB",V4L2_STD_ATSC_8_VSB},
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{"16VSB",V4L2_STD_ATSC_16_VSB},
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};
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// Search an array of std_name structures and return a pointer to the
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// element with the matching name.
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static const struct std_name *find_std_name(const struct std_name *arrPtr,
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unsigned int arrSize,
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const char *bufPtr,
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unsigned int bufSize)
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{
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unsigned int idx;
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const struct std_name *p;
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for (idx = 0; idx < arrSize; idx++) {
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p = arrPtr + idx;
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if (strlen(p->name) != bufSize) continue;
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if (!memcmp(bufPtr,p->name,bufSize)) return p;
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}
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return NULL;
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}
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int pvr2_std_str_to_id(v4l2_std_id *idPtr,const char *bufPtr,
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unsigned int bufSize)
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{
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v4l2_std_id id = 0;
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v4l2_std_id cmsk = 0;
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v4l2_std_id t;
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int mMode = 0;
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unsigned int cnt;
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char ch;
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const struct std_name *sp;
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while (bufSize) {
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if (!mMode) {
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cnt = 0;
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while ((cnt < bufSize) && (bufPtr[cnt] != '-')) cnt++;
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if (cnt >= bufSize) return 0; // No more characters
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sp = find_std_name(std_groups, ARRAY_SIZE(std_groups),
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bufPtr,cnt);
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if (!sp) return 0; // Illegal color system name
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cnt++;
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bufPtr += cnt;
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bufSize -= cnt;
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mMode = !0;
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cmsk = sp->id;
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continue;
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}
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cnt = 0;
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while (cnt < bufSize) {
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ch = bufPtr[cnt];
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if (ch == ';') {
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mMode = 0;
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break;
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}
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if (ch == '/') break;
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cnt++;
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}
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sp = find_std_name(std_items, ARRAY_SIZE(std_items),
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bufPtr,cnt);
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if (!sp) return 0; // Illegal modulation system ID
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t = sp->id & cmsk;
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if (!t) return 0; // Specific color + modulation system illegal
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id |= t;
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if (cnt < bufSize) cnt++;
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bufPtr += cnt;
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bufSize -= cnt;
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}
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if (idPtr) *idPtr = id;
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return !0;
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}
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unsigned int pvr2_std_id_to_str(char *bufPtr, unsigned int bufSize,
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v4l2_std_id id)
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{
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unsigned int idx1,idx2;
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const struct std_name *ip,*gp;
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int gfl,cfl;
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unsigned int c1,c2;
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cfl = 0;
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c1 = 0;
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for (idx1 = 0; idx1 < ARRAY_SIZE(std_groups); idx1++) {
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gp = std_groups + idx1;
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gfl = 0;
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for (idx2 = 0; idx2 < ARRAY_SIZE(std_items); idx2++) {
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ip = std_items + idx2;
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if (!(gp->id & ip->id & id)) continue;
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if (!gfl) {
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if (cfl) {
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c2 = scnprintf(bufPtr,bufSize,";");
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c1 += c2;
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bufSize -= c2;
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bufPtr += c2;
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}
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cfl = !0;
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c2 = scnprintf(bufPtr,bufSize,
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"%s-",gp->name);
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gfl = !0;
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} else {
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c2 = scnprintf(bufPtr,bufSize,"/");
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}
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c1 += c2;
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bufSize -= c2;
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bufPtr += c2;
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c2 = scnprintf(bufPtr,bufSize,
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ip->name);
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c1 += c2;
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bufSize -= c2;
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bufPtr += c2;
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}
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}
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return c1;
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}
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// Template data for possible enumerated video standards. Here we group
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// standards which share common frame rates and resolution.
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static struct v4l2_standard generic_standards[] = {
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{
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.id = (TSTD_B|TSTD_B1|
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TSTD_D|TSTD_D1|
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TSTD_G|
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TSTD_H|
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TSTD_I|
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TSTD_K|TSTD_K1|
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TSTD_L|
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V4L2_STD_SECAM_LC |
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TSTD_N|TSTD_Nc),
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.frameperiod =
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{
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.numerator = 1,
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.denominator= 25
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},
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.framelines = 625,
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.reserved = {0,0,0,0}
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}, {
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.id = (TSTD_M|
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V4L2_STD_NTSC_M_JP|
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V4L2_STD_NTSC_M_KR),
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.frameperiod =
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{
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.numerator = 1001,
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.denominator= 30000
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},
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.framelines = 525,
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.reserved = {0,0,0,0}
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}, { // This is a total wild guess
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.id = (TSTD_60),
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.frameperiod =
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{
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.numerator = 1001,
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.denominator= 30000
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},
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.framelines = 525,
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.reserved = {0,0,0,0}
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}, { // This is total wild guess
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.id = V4L2_STD_NTSC_443,
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.frameperiod =
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{
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.numerator = 1001,
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.denominator= 30000
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},
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.framelines = 525,
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.reserved = {0,0,0,0}
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}
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};
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static struct v4l2_standard *match_std(v4l2_std_id id)
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{
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unsigned int idx;
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for (idx = 0; idx < ARRAY_SIZE(generic_standards); idx++) {
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if (generic_standards[idx].id & id) {
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return generic_standards + idx;
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}
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}
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return NULL;
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}
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static int pvr2_std_fill(struct v4l2_standard *std,v4l2_std_id id)
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{
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struct v4l2_standard *template;
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int idx;
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unsigned int bcnt;
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template = match_std(id);
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if (!template) return 0;
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idx = std->index;
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memcpy(std,template,sizeof(*template));
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std->index = idx;
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std->id = id;
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bcnt = pvr2_std_id_to_str(std->name,sizeof(std->name)-1,id);
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std->name[bcnt] = 0;
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pvr2_trace(PVR2_TRACE_STD,"Set up standard idx=%u name=%s",
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std->index,std->name);
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return !0;
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}
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/* These are special cases of combined standards that we should enumerate
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separately if the component pieces are present. */
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static v4l2_std_id std_mixes[] = {
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V4L2_STD_PAL_B | V4L2_STD_PAL_G,
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V4L2_STD_PAL_D | V4L2_STD_PAL_K,
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V4L2_STD_SECAM_B | V4L2_STD_SECAM_G,
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V4L2_STD_SECAM_D | V4L2_STD_SECAM_K,
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};
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struct v4l2_standard *pvr2_std_create_enum(unsigned int *countptr,
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v4l2_std_id id)
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{
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unsigned int std_cnt = 0;
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unsigned int idx,bcnt,idx2;
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v4l2_std_id idmsk,cmsk,fmsk;
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struct v4l2_standard *stddefs;
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if (pvrusb2_debug & PVR2_TRACE_STD) {
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char buf[100];
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bcnt = pvr2_std_id_to_str(buf,sizeof(buf),id);
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pvr2_trace(
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PVR2_TRACE_STD,"Mapping standards mask=0x%x (%.*s)",
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(int)id,bcnt,buf);
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}
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*countptr = 0;
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std_cnt = 0;
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fmsk = 0;
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for (idmsk = 1, cmsk = id; cmsk; idmsk <<= 1) {
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if (!(idmsk & cmsk)) continue;
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cmsk &= ~idmsk;
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if (match_std(idmsk)) {
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std_cnt++;
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continue;
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}
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fmsk |= idmsk;
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}
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for (idx2 = 0; idx2 < ARRAY_SIZE(std_mixes); idx2++) {
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if ((id & std_mixes[idx2]) == std_mixes[idx2]) std_cnt++;
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}
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/* Don't complain about ATSC standard values */
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fmsk &= ~CSTD_ATSC;
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if (fmsk) {
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char buf[100];
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bcnt = pvr2_std_id_to_str(buf,sizeof(buf),fmsk);
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pvr2_trace(
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PVR2_TRACE_ERROR_LEGS,
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"***WARNING*** Failed to classify the following standard(s): %.*s",
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bcnt,buf);
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}
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pvr2_trace(PVR2_TRACE_STD,"Setting up %u unique standard(s)",
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std_cnt);
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if (!std_cnt) return NULL; // paranoia
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stddefs = kcalloc(std_cnt, sizeof(struct v4l2_standard),
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GFP_KERNEL);
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if (!stddefs)
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return NULL;
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for (idx = 0; idx < std_cnt; idx++)
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stddefs[idx].index = idx;
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idx = 0;
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/* Enumerate potential special cases */
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for (idx2 = 0; (idx2 < ARRAY_SIZE(std_mixes)) && (idx < std_cnt);
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idx2++) {
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if (!(id & std_mixes[idx2])) continue;
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if (pvr2_std_fill(stddefs+idx,std_mixes[idx2])) idx++;
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}
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/* Now enumerate individual pieces */
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for (idmsk = 1, cmsk = id; cmsk && (idx < std_cnt); idmsk <<= 1) {
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if (!(idmsk & cmsk)) continue;
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cmsk &= ~idmsk;
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if (!pvr2_std_fill(stddefs+idx,idmsk)) continue;
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idx++;
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}
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*countptr = std_cnt;
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return stddefs;
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}
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v4l2_std_id pvr2_std_get_usable(void)
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{
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return CSTD_ALL;
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}
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