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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * cx18 Vertical Blank Interval support functions4 *5 * Derived from ivtv-vbi.c6 *7 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>8 */9 10#include "cx18-driver.h"11#include "cx18-vbi.h"12#include "cx18-ioctl.h"13#include "cx18-queue.h"14 15/*16 * Raster Reference/Protection (RP) bytes, used in Start/End Active17 * Video codes emitted from the digitzer in VIP 1.x mode, that flag the start18 * of VBI sample or VBI ancillary data regions in the digital ratser line.19 *20 * Task FieldEven VerticalBlank HorizontalBlank 0 0 0 021 */22static const u8 raw_vbi_sav_rp[2] = { 0x20, 0x60 }; /* __V_, _FV_ */23static const u8 sliced_vbi_eav_rp[2] = { 0xb0, 0xf0 }; /* T_VH, TFVH */24 25static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp)26{27 int line = 0;28 int i;29 u32 linemask[2] = { 0, 0 };30 unsigned short size;31 static const u8 mpeg_hdr_data[] = {32 /* MPEG-2 Program Pack */33 0x00, 0x00, 0x01, 0xba, /* Prog Pack start code */34 0x44, 0x00, 0x0c, 0x66, 0x24, 0x01, /* SCR, SCR Ext, markers */35 0x01, 0xd1, 0xd3, /* Mux Rate, markers */36 0xfa, 0xff, 0xff, /* Res, Suff cnt, Stuff */37 /* MPEG-2 Private Stream 1 PES Packet */38 0x00, 0x00, 0x01, 0xbd, /* Priv Stream 1 start */39 0x00, 0x1a, /* length */40 0x84, 0x80, 0x07, /* flags, hdr data len */41 0x21, 0x00, 0x5d, 0x63, 0xa7, /* PTS, markers */42 0xff, 0xff /* stuffing */43 };44 const int sd = sizeof(mpeg_hdr_data); /* start of vbi data */45 int idx = cx->vbi.frame % CX18_VBI_FRAMES;46 u8 *dst = &cx->vbi.sliced_mpeg_data[idx][0];47 48 for (i = 0; i < lines; i++) {49 struct v4l2_sliced_vbi_data *sdata = cx->vbi.sliced_data + i;50 int f, l;51 52 if (sdata->id == 0)53 continue;54 55 l = sdata->line - 6;56 f = sdata->field;57 if (f)58 l += 18;59 if (l < 32)60 linemask[0] |= (1 << l);61 else62 linemask[1] |= (1 << (l - 32));63 dst[sd + 12 + line * 43] = cx18_service2vbi(sdata->id);64 memcpy(dst + sd + 12 + line * 43 + 1, sdata->data, 42);65 line++;66 }67 memcpy(dst, mpeg_hdr_data, sizeof(mpeg_hdr_data));68 if (line == 36) {69 /* All lines are used, so there is no space for the linemask70 (the max size of the VBI data is 36 * 43 + 4 bytes).71 So in this case we use the magic number 'ITV0'. */72 memcpy(dst + sd, "ITV0", 4);73 memmove(dst + sd + 4, dst + sd + 12, line * 43);74 size = 4 + ((43 * line + 3) & ~3);75 } else {76 memcpy(dst + sd, "itv0", 4);77 cpu_to_le32s(&linemask[0]);78 cpu_to_le32s(&linemask[1]);79 memcpy(dst + sd + 4, &linemask[0], 8);80 size = 12 + ((43 * line + 3) & ~3);81 }82 dst[4+16] = (size + 10) >> 8;83 dst[5+16] = (size + 10) & 0xff;84 dst[9+16] = 0x21 | ((pts_stamp >> 29) & 0x6);85 dst[10+16] = (pts_stamp >> 22) & 0xff;86 dst[11+16] = 1 | ((pts_stamp >> 14) & 0xff);87 dst[12+16] = (pts_stamp >> 7) & 0xff;88 dst[13+16] = 1 | ((pts_stamp & 0x7f) << 1);89 cx->vbi.sliced_mpeg_size[idx] = sd + size;90}91 92/* Compress raw VBI format, removes leading SAV codes and surplus space93 after the frame. Returns new compressed size. */94/* FIXME - this function ignores the input size. */95static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size, u32 hdr_size)96{97 u32 line_size = VBI_ACTIVE_SAMPLES;98 u32 lines = cx->vbi.count * 2;99 u8 *q = buf;100 u8 *p;101 int i;102 103 /* Skip the header */104 buf += hdr_size;105 106 for (i = 0; i < lines; i++) {107 p = buf + i * line_size;108 109 /* Look for SAV code */110 if (p[0] != 0xff || p[1] || p[2] ||111 (p[3] != raw_vbi_sav_rp[0] &&112 p[3] != raw_vbi_sav_rp[1]))113 break;114 if (i == lines - 1) {115 /* last line is hdr_size bytes short - extrapolate it */116 memcpy(q, p + 4, line_size - 4 - hdr_size);117 q += line_size - 4 - hdr_size;118 p += line_size - hdr_size - 1;119 memset(q, (int) *p, hdr_size);120 } else {121 memcpy(q, p + 4, line_size - 4);122 q += line_size - 4;123 }124 }125 return lines * (line_size - 4);126}127 128static u32 compress_sliced_buf(struct cx18 *cx, u8 *buf, u32 size,129 const u32 hdr_size)130{131 struct v4l2_decode_vbi_line vbi;132 int i;133 u32 line = 0;134 u32 line_size = cx->is_60hz ? VBI_HBLANK_SAMPLES_60HZ135 : VBI_HBLANK_SAMPLES_50HZ;136 137 /* find the first valid line */138 for (i = hdr_size, buf += hdr_size; i < size; i++, buf++) {139 if (buf[0] == 0xff && !buf[1] && !buf[2] &&140 (buf[3] == sliced_vbi_eav_rp[0] ||141 buf[3] == sliced_vbi_eav_rp[1]))142 break;143 }144 145 /*146 * The last line is short by hdr_size bytes, but for the remaining147 * checks against size, we pretend that it is not, by counting the148 * header bytes we knowingly skipped149 */150 size -= (i - hdr_size);151 if (size < line_size)152 return line;153 154 for (i = 0; i < size / line_size; i++) {155 u8 *p = buf + i * line_size;156 157 /* Look for EAV code */158 if (p[0] != 0xff || p[1] || p[2] ||159 (p[3] != sliced_vbi_eav_rp[0] &&160 p[3] != sliced_vbi_eav_rp[1]))161 continue;162 vbi.p = p + 4;163 v4l2_subdev_call(cx->sd_av, vbi, decode_vbi_line, &vbi);164 if (vbi.type) {165 cx->vbi.sliced_data[line].id = vbi.type;166 cx->vbi.sliced_data[line].field = vbi.is_second_field;167 cx->vbi.sliced_data[line].line = vbi.line;168 memcpy(cx->vbi.sliced_data[line].data, vbi.p, 42);169 line++;170 }171 }172 return line;173}174 175static void _cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf)176{177 /*178 * The CX23418 provides a 12 byte header in its raw VBI buffers to us:179 * 0x3fffffff [4 bytes of something] [4 byte presentation time stamp]180 */181 struct vbi_data_hdr {182 __be32 magic;183 __be32 unknown;184 __be32 pts;185 } *hdr = (struct vbi_data_hdr *) buf->buf;186 187 u8 *p = (u8 *) buf->buf;188 u32 size = buf->bytesused;189 u32 pts;190 int lines;191 192 /*193 * The CX23418 sends us data that is 32 bit little-endian swapped,194 * but we want the raw VBI bytes in the order they were in the raster195 * line. This has a side effect of making the header big endian196 */197 cx18_buf_swap(buf);198 199 /* Raw VBI data */200 if (cx18_raw_vbi(cx)) {201 202 size = buf->bytesused =203 compress_raw_buf(cx, p, size, sizeof(struct vbi_data_hdr));204 205 /*206 * Hack needed for compatibility with old VBI software.207 * Write the frame # at the last 4 bytes of the frame208 */209 p += size - 4;210 memcpy(p, &cx->vbi.frame, 4);211 cx->vbi.frame++;212 return;213 }214 215 /* Sliced VBI data with data insertion */216 217 pts = (be32_to_cpu(hdr->magic) == 0x3fffffff) ? be32_to_cpu(hdr->pts)218 : 0;219 220 lines = compress_sliced_buf(cx, p, size, sizeof(struct vbi_data_hdr));221 222 /* always return at least one empty line */223 if (lines == 0) {224 cx->vbi.sliced_data[0].id = 0;225 cx->vbi.sliced_data[0].line = 0;226 cx->vbi.sliced_data[0].field = 0;227 lines = 1;228 }229 buf->bytesused = size = lines * sizeof(cx->vbi.sliced_data[0]);230 memcpy(p, &cx->vbi.sliced_data[0], size);231 232 if (cx->vbi.insert_mpeg)233 copy_vbi_data(cx, lines, pts);234 cx->vbi.frame++;235}236 237void cx18_process_vbi_data(struct cx18 *cx, struct cx18_mdl *mdl,238 int streamtype)239{240 struct cx18_buffer *buf;241 u32 orig_used;242 243 if (streamtype != CX18_ENC_STREAM_TYPE_VBI)244 return;245 246 /*247 * Big assumption here:248 * Every buffer hooked to the MDL's buf_list is a complete VBI frame249 * that ends at the end of the buffer.250 *251 * To assume anything else would make the code in this file252 * more complex, or require extra memcpy()'s to make the253 * buffers satisfy the above assumption. It's just simpler to set254 * up the encoder buffer transfers to make the assumption true.255 */256 list_for_each_entry(buf, &mdl->buf_list, list) {257 orig_used = buf->bytesused;258 if (orig_used == 0)259 break;260 _cx18_process_vbi_data(cx, buf);261 mdl->bytesused -= (orig_used - buf->bytesused);262 }263}264