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-rw-r--r--vid-scratch/common.h259
1 files changed, 259 insertions, 0 deletions
diff --git a/vid-scratch/common.h b/vid-scratch/common.h
new file mode 100644
index 0000000..91f94fd
--- /dev/null
+++ b/vid-scratch/common.h
@@ -0,0 +1,259 @@
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h> /* for perror() */
+#include <string.h> /* for memcpy() */
+#include <stdlib.h> /* for realloc(), free() */
+#include <unistd.h> /* for write() */
+
+#define LM_ARRAY_LEN(ary) (sizeof(ary)/sizeof((ary)[0]))
+#define LM_CEILDIV(n, d) ( ((n)+(d)-1) / (d) )
+#define LM_NEXT_POWER_OF_2(x) ( (x) ? 1ULL<<((sizeof(unsigned long long)*8)-__builtin_clzll(x)) : 1)
+#define LM_CAT2(a, b) a ## b
+#define LM_CAT2_(a, b) LM_CAT2(a, b)
+#define assert_notreached(msg) assert(false)
+
+struct buf {
+ uint8_t *dat;
+ size_t len;
+ size_t cap;
+};
+
+void append(struct buf *buf, void *dat, size_t len) {
+ assert(buf);
+ assert(len == 0 || dat);
+
+ if (buf->len + len > buf->cap) {
+ buf->cap = LM_NEXT_POWER_OF_2(buf->len + len);
+ buf->dat = realloc(buf->dat, buf->cap);
+ assert(buf->dat);
+ }
+ memcpy(&buf->dat[buf->len], dat, len);
+ buf->len += len;
+}
+
+void append_u32be(struct buf *buf, uint32_t val) {
+ assert(buf);
+
+ uint8_t dat[4] = {
+ (val>>(8*3))&0xFF,
+ (val>>(8*2))&0xFF,
+ (val>>(8*1))&0xFF,
+ (val>>(8*0))&0xFF,
+ };
+ append(buf, dat, sizeof(dat));
+}
+
+bool xwrite(int fd, uint8_t *dat, size_t len) {
+ assert(len == 0 || dat);
+
+ for (size_t done = 0; done < len;) {
+ ssize_t n = write(fd, &dat[done], len-done);
+ if (n < 0) {
+ perror("write");
+ return true;
+ }
+ done += n;
+ }
+ return false;
+}
+
+/* NUT ************************************************************************/
+
+/* Magic values. *****************************************/
+uint8_t nut_file_id_string[] = "nut/multimedia container"; /* including NUL terminator */
+uint8_t nut_startcode_main[] = {'N', 'M', 0x7A, 0x56, 0x1F, 0x5F, 0x04, 0xAD };
+uint8_t nut_startcode_stream[] = {'N', 'S', 0x11, 0x40, 0x5B, 0xF2, 0xF9, 0xDB };
+uint8_t nut_startcode_syncpoint[] = {'N', 'K', 0xE4, 0xAD, 0xEE, 0xCA, 0x45, 0x69 };
+uint8_t nut_startcode_index[] = {'N', 'X', 0xDD, 0x67, 0x2F, 0x23, 0xE6, 0x4E };
+uint8_t nut_startcode_info[] = {'N', 'I', 0xAB, 0x68, 0xB5, 0x96, 0xBA, 0x78 };
+
+#define NUT_FRAMEFLAG_KEY (1<< 0)
+#define NUT_FRAMEFLAG_EOR (1<< 1)
+#define _NUT_FRAMEFLAG_2 (1<< 2)
+#define NUT_FRAMEFLAG_CODED_PTS (1<< 3)
+#define NUT_FRAMEFLAG_STREAM_ID (1<< 4)
+#define NUT_FRAMEFLAG_SIZE_MSB (1<< 5)
+#define NUT_FRAMEFLAG_CHECKSUM (1<< 6)
+#define NUT_FRAMEFLAG_RESERVED (1<< 7)
+#define NUT_FRAMEFLAG_SM_DATA (1<< 8)
+#define _NUT_FRAMEFLAG_9 (1<< 9)
+#define NUT_FRAMEFLAG_HEADER_IDX (1<<10)
+#define NUT_FRAMEFLAG_MATCH_TIME (1<<11)
+#define NUT_FRAMEFLAG_CODED (1<<12)
+#define NUT_FRAMEFLAG_INVALID (1<<13)
+
+#define NUT_MAINFLAG_BROADCAST_MODE (1<< 0)
+#define NUT_MAINFLAG_PIPE_MODE (1<< 1)
+
+#define NUT_UNKNOWN_MATCH_TIME (1-(UINT64_C(1)<<62))
+
+enum nut_stream_class {
+ NUT_STREAMCLASS_VIDEO = 0,
+ NUT_STREAMCLASS_AUDIO = 1,
+ NUT_STREAMCLASS_SUBTITLES = 2,
+ NUT_STREAMCLASS_USERDATA = 3,
+};
+
+#define NUT_STREAMFLAG_FIXED_FPS (1<< 1)
+
+enum nut_colorspace {
+ NUT_COLORSPACE_UNKNOWN = 0,
+ NUT_COLORSPACE_ITU642_TRUNC = 1,
+ NUT_COLORSPACE_ITU709_TRUNC = 2,
+ NUT_COLORSPACE_ITU642_FULL = 17,
+ NUT_COLORSPACE_ITU709_FILL = 18,
+};
+
+/* Basic fixed-length types. *****************************/
+
+void nut_append_u8(struct buf *buf, uint8_t val) {
+ assert(buf);
+
+ append(buf, &val, 1);
+}
+
+void nut_append_u32(struct buf *buf, uint32_t val) {
+ assert(buf);
+
+ append_u32be(buf, val);
+}
+
+/* Basic variable-length types. **************************/
+
+void nut_append_vu(struct buf *buf, uint64_t val) {
+ assert(buf);
+
+ uint8_t dat[10] = {
+ 0x80|((val>>(7*9))&0x7F),
+ 0x80|((val>>(7*8))&0x7F),
+ 0x80|((val>>(7*7))&0x7F),
+ 0x80|((val>>(7*6))&0x7F),
+ 0x80|((val>>(7*5))&0x7F),
+ 0x80|((val>>(7*4))&0x7F),
+ 0x80|((val>>(7*3))&0x7F),
+ 0x80|((val>>(7*2))&0x7F),
+ 0x80|((val>>(7*1))&0x7F),
+ 0x00|((val>>(7*0))&0x7F),
+ };
+ uint8_t skip = 0;
+ while (dat[skip] == 0x80)
+ skip++;
+ append(buf, &dat[skip], sizeof(dat)-skip);
+}
+
+void nut_append_vs(struct buf *buf, int64_t val) {
+ assert(buf);
+ assert((val < 0 ? -val : val) <= UINT64_MAX>>1);
+
+ uint64_t temp;
+ if (val > 0)
+ temp = val << 1;
+ else
+ temp = ((-val) << 1) | 1;
+ temp--;
+ nut_append_vu(buf, temp);
+}
+
+void nut_append_vb(struct buf *buf, void *dat, size_t len) {
+ assert(buf);
+ assert(len == 0 || dat);
+
+ nut_append_vu(buf, len);
+ append(buf, dat, len);
+}
+
+#define nut_append_vb_str(buf, str) nut_append_vb(buf, str, sizeof(str)-1)
+
+/* Mid-level. ********************************************/
+
+uint32_t nut_crc32(uint8_t *dat, int len){
+ assert(len == 0 || dat);
+
+ /* "Generator polynomial is 0x104C11DB7." */
+ static const uint32_t table[16] = {
+ 0x00000000, 0x04C11DB7, 0x09823B6E, 0x0D4326D9,
+ 0x130476DC, 0x17C56B6B, 0x1A864DB2, 0x1E475005,
+ 0x2608EDB8, 0x22C9F00F, 0x2F8AD6D6, 0x2B4BCB61,
+ 0x350C9B64, 0x31CD86D3, 0x3C8EA00A, 0x384FBDBD,
+ };
+
+ /* "Starting value is zero." */
+ uint32_t crc = 0;
+
+ while (len--) {
+ crc ^= *dat++ << 24;
+ crc = (crc<<4) ^ table[crc>>28];
+ crc = (crc<<4) ^ table[crc>>28];
+ }
+ return crc;
+}
+
+void nut_append_packet(struct buf *buf, uint8_t *startcode, void *data, size_t len) {
+ assert(buf);
+ assert(startcode);
+ assert(len == 0 || data);
+
+ size_t packet_beg = buf->len;
+ append(buf, startcode, 8);
+ nut_append_vu(buf, len+4);
+ if (len+4 > 4096)
+ nut_append_u32(buf, nut_crc32(&buf->dat[packet_beg], buf->len - packet_beg));
+ size_t data_beg = buf->len;
+ append(buf, data, len);
+ nut_append_u32(buf, nut_crc32(&buf->dat[data_beg], buf->len - data_beg));
+}
+
+[[gnu::nonstring]] char font[10][8*4] = {
+ " ## "
+ " # # "
+ " # # "
+ " ## ",
+
+ " # "
+ " ## "
+ " # "
+ " ### ",
+
+ " ## "
+ " # # "
+ " # "
+ " #### ",
+
+ " ## "
+ " # "
+ " # "
+ " ## ",
+
+ " ## "
+ " # # "
+ " #### "
+ " # ",
+
+ " #### "
+ " ### "
+ " # "
+ " ### ",
+
+ " # "
+ " ### "
+ " # # "
+ " ## ",
+
+ " #### "
+ " # "
+ " # "
+ " # ",
+
+ " ## "
+ " # # "
+ " #### "
+ " ## ",
+
+ " ## "
+ " # # "
+ " ### "
+ " # ",
+};
+static_assert(LM_ARRAY_LEN(font) == 10);
+static_assert(sizeof(font[0]) == 32);
generated by cgit v1.2.3-2-g168b (git 2.25.1) at 2025-06-27 05:02:15 +0000