aboutsummaryrefslogtreecommitdiff
path: root/a.c
diff options
context:
space:
mode:
Diffstat (limited to 'a.c')
-rw-r--r--a.c254
1 files changed, 0 insertions, 254 deletions
diff --git a/a.c b/a.c
deleted file mode 100644
index 50dc1cc91..000000000
--- a/a.c
+++ /dev/null
@@ -1,254 +0,0 @@
-#include <stdio.h>
-#include <string.h>
-#include <assert.h>
-#include <stdint.h>
-
-#define FLVF_HEADER 1
-#define FLVF_SCRIPT 2
-
-struct flvhdr
-{
- char fh_magic[3];
- char fh_version;
- char fh_flags;
- char fh_hlen[4];
- char fh_pads[4];
-}__attribute__((packed));
-
-struct taghdr
-{
- uint8_t th_type;
- uint8_t th_dlen[3];
- uint8_t th_tstamp[3];
- uint8_t th_xstamp;
- uint8_t th_streamid[3];
-}__attribute__((packed));
-
-struct flvcombine
-{
- FILE * fc_file;
- uint32_t fc_flags;
- uint32_t fc_timestamp;
- uint32_t fc_filesize;
- double fc_duration;
- int fc_filesize_offset;
- int fc_duration_offset;
-};
-
-/* duration, filesize */
-
-uint32_t buftoint(const void *buf, size_t len)
-{
- uint32_t bufint = 0;
- const uint8_t *pval = (const uint8_t *)buf;
- while (len-- > 0)
- bufint = (bufint << 8) + *pval++;
- return bufint;
-}
-
-int dd_copy(FILE * dst_fp, FILE * src_fp, size_t dlen)
-{
- size_t len;
- char buf[64 * 1024];
- while (dlen > 0 && !feof(src_fp)) {
- len = fread(buf, 1, dlen < sizeof(buf)? dlen: sizeof(buf), src_fp);
- if (fwrite(buf, 1, len, dst_fp) != len)
- break;
- dlen -= len;
- }
- return dlen;
-}
-
-void adjtimestamp(struct taghdr *header, uint32_t stampbase)
-{
- uint32_t netval = 0;
- uint32_t adjtime = stampbase;
- adjtime += buftoint(&header->th_tstamp, sizeof(header->th_tstamp));
- adjtime += (header->th_xstamp << 24);
- header->th_xstamp = (adjtime >> 24);
- header->th_tstamp[0] = (adjtime >> 16);
- header->th_tstamp[1] = (adjtime >> 8);
- header->th_tstamp[2] = (adjtime >> 0);
-}
-
-void update_metainfo(struct flvcombine *combine, FILE *fp, size_t dlen)
-{
- int i;
- size_t len;
- char *pmem = NULL;
- char buf[256 * 1024];
- double duration = 0.0;
- uint8_t duration_bytes[8];
- printf("dlen: %d\n", dlen);
- assert (dlen < (256 * 1024));
-
- len = fread(buf, 1, dlen < sizeof(buf)? dlen: sizeof(buf), fp);
- if (len == 0)
- return;
- pmem = (char *)memmem(buf, len, "duration", 8);
- if (pmem == NULL || pmem + 17l - buf > len)
- return;
- memcpy(&duration_bytes, pmem + 9, 8);
- for (i = 0; i < 4; i ++) {
- uint8_t tmp = duration_bytes[i];
- duration_bytes[i] = duration_bytes[7 - i];
- duration_bytes[7 - i] = tmp;
- }
- memcpy(&duration, &duration_bytes, 8);
- combine->fc_duration += duration;
- if (combine->fc_flags & FLVF_SCRIPT)
- return;
- combine->fc_duration_offset =
- combine->fc_filesize + (pmem + 9l - buf) + sizeof(struct taghdr);
- pmem = (char *)memmem(buf, len, "filesize", 8);
- if (pmem == NULL || pmem + 17l - buf > len)
- return;
- combine->fc_filesize_offset =
- combine->fc_filesize + (pmem + 9l - buf) + sizeof(struct taghdr);
-}
-
-int addflv(struct flvcombine *combine, const char *path)
-{
- int error = 0;
- FILE *fp, *fout;
- char magic[4];
- long savepos;
- size_t len, dlen, flags;
- struct flvhdr header;
- struct taghdr *last;
- struct taghdr tagvideo;
- struct taghdr tagaudio;
- struct taghdr tagheader;
-
- fp = fopen(path, "rb");
- fout = combine->fc_file;
- if (fp == NULL || fout == NULL)
- return 0;
-
- last = NULL;
- memset(magic, 0, sizeof(magic));
- memset(&tagvideo, 0, sizeof(tagvideo));
- memset(&tagaudio, 0, sizeof(tagaudio));
-
- if ( !fread(&header, sizeof(header), 1, fp) )
- goto fail;
-
- memcpy(magic, header.fh_magic, 3);
- if ( strcmp("FLV", magic) )
- goto fail;
-
- if ((combine->fc_flags & FLVF_HEADER) == 0) {
- fwrite(&header, sizeof(header), 1, fout);
- combine->fc_filesize += sizeof(header);
- combine->fc_flags |= FLVF_HEADER;
- }
-
- printf("magic: %s\n", magic);
- printf("flags: 0x%02x\n", header.fh_flags);
- printf("version: 0x%02x\n", header.fh_version);
- printf("header len: %d\n", buftoint(header.fh_hlen, sizeof(header.fh_hlen)));
-
- while (feof(fp) == 0) {
- if ( !fread(&tagheader, sizeof(tagheader), 1, fp) )
- goto fail;
-
- dlen = buftoint(tagheader.th_dlen, sizeof(tagheader.th_dlen));
-
- switch (tagheader.th_type)
- {
- case 0x09:
- adjtimestamp(&tagheader, combine->fc_timestamp);
- tagvideo = tagheader;
- last = &tagvideo;
- break;
- case 0x08:
- adjtimestamp(&tagheader, combine->fc_timestamp);
- tagaudio = tagheader;
- last = &tagaudio;
- break;
- default:
- flags = combine->fc_flags;
- savepos = ftell(fp);
- if (savepos == -1)
- goto fail;
- savepos = (flags & FLVF_SCRIPT)? (savepos + dlen + 4): savepos;
- update_metainfo(combine, fp, dlen);
- combine->fc_flags |= FLVF_SCRIPT;
- if ( fseek(fp, savepos, SEEK_SET) )
- goto fail;
- if (flags & FLVF_SCRIPT)
- continue;
- break;
- }
- fwrite(&tagheader, sizeof(tagheader), 1, fout);
- combine->fc_filesize += sizeof(tagheader);
- combine->fc_filesize += (dlen + 4);
- if ( dd_copy(fout, fp, dlen + 4)) {
- error = -__LINE__;
- break;
- }
- }
-
-fail:
- fclose(fp);
- if (last == &tagvideo || last == &tagaudio) {
- combine->fc_timestamp = buftoint(last->th_tstamp, sizeof(last->th_tstamp));
- combine->fc_timestamp |= (last->th_xstamp << 24);
- printf("time stamp: %d\n", combine->fc_timestamp);
- }
- return 0;
-}
-
-void fixedflv(struct flvcombine *context)
-{
- int i;
- double dblval = 0.0;
- uint8_t dblbytes[8];
- FILE *fout = context->fc_file;
-
- if (context->fc_filesize_offset > 0) {
- if ( fseek(fout, context->fc_filesize_offset, SEEK_SET) )
- return;
- dblval = context->fc_filesize;
- memcpy(dblbytes, &dblval, 8);
-
- for (i = 0; i < 4; i ++) {
- uint8_t tmp = dblbytes[i];
- dblbytes[i] = dblbytes[7 - i];
- dblbytes[7 - i] = tmp;
- }
- fwrite(dblbytes, 8, 1, fout);
- }
-
- if (context->fc_duration_offset > 0) {
- if ( fseek(fout, context->fc_duration_offset, SEEK_SET) )
- return;
- dblval = context->fc_duration;
- memcpy(dblbytes, &dblval, 8);
-
- for (i = 0; i < 4; i ++) {
- uint8_t tmp = dblbytes[i];
- dblbytes[i] = dblbytes[7 - i];
- dblbytes[7 - i] = tmp;
- }
- fwrite(dblbytes, 8, 1, fout);
- }
-}
-
-int main(int argc, char *argv[])
-{
- int i;
- struct flvcombine context;
- memset(&context, 0, sizeof(context));
- context.fc_file = fopen("out.flv", "wb");
- if (context.fc_file == NULL)
- return -1;
- context.fc_duration = 0;
- for (i = 1; i < argc; i++)
- addflv(&context, argv[i]);
- fixedflv(&context);
- fclose(context.fc_file);
-
- printf("seconds: %d\n", context.fc_timestamp);
- return 0;
-}
generated by cgit v1.2.3 (git 2.26.2) at 2025-10-31 14:42:01 +0000