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/*****************************************************************************
* mpeg_restamp.c: Restamps PCR and PTS/DTS to make them appear continuous
*****************************************************************************
* Copyright (C) 2013 VideoLAN
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject
* to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*****************************************************************************/
/* Limitation: this supposes the PES header is not fragmented over several
* TS packets, and that the stream is not scrambled. */
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <inttypes.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <time.h>
#include <bitstream/mpeg/ts.h>
#include <bitstream/mpeg/pes.h>
#define UINT33_MAX UINT64_C(8589934592)
#define TS_CLOCK_MAX UINT33_MAX
#define CLOCK_FREQ UINT64_C(90000)
#define MAX_PCR_INTERVAL (CLOCK_FREQ / 10)
/*****************************************************************************
* Local declarations
*****************************************************************************/
static uint64_t i_last_pcr_date;
static uint64_t i_last_pcr = TS_CLOCK_MAX;
static uint64_t i_pcr_offset = 0;
/*****************************************************************************
* get_date:
*****************************************************************************/
static uint64_t get_date(void)
{
struct timespec ts;
/* Try to use POSIX monotonic clock if available */
if (clock_gettime(CLOCK_MONOTONIC, &ts) == EINVAL)
/* Run-time fallback to real-time clock (always available) */
(void)clock_gettime(CLOCK_REALTIME, &ts);
return ((uint64_t)ts.tv_sec * CLOCK_FREQ)
+ ((uint64_t)ts.tv_nsec * (CLOCK_FREQ / 10000) / 100000);
}
/*****************************************************************************
* handle_pcr:
*****************************************************************************/
static void handle_pcr(uint8_t *p_ts, uint64_t i_date)
{
uint64_t i_pcr = tsaf_get_pcr(p_ts);
bool b_discontinuity = tsaf_has_discontinuity(p_ts);
if (i_last_pcr == TS_CLOCK_MAX)
i_last_pcr = i_pcr;
else {
/* handle 2^33 wrap-arounds */
uint64_t i_delta =
(TS_CLOCK_MAX + i_pcr -
(i_last_pcr % TS_CLOCK_MAX)) % TS_CLOCK_MAX;
if (i_delta <= MAX_PCR_INTERVAL && !b_discontinuity)
i_last_pcr = i_pcr;
else {
i_last_pcr += i_date - i_last_pcr_date;
i_last_pcr %= TS_CLOCK_MAX;
i_pcr_offset += TS_CLOCK_MAX + i_last_pcr - i_pcr;
i_pcr_offset %= TS_CLOCK_MAX;
i_last_pcr = i_pcr;
}
}
i_last_pcr_date = i_date;
if (!i_pcr_offset)
return;
i_pcr += i_pcr_offset;
i_pcr %= TS_CLOCK_MAX;
tsaf_set_pcr(p_ts, i_pcr);
tsaf_clear_discontinuity(p_ts);
}
/*****************************************************************************
* handle_ts:
*****************************************************************************/
static uint64_t handle_ts(uint64_t i_ts)
{
i_ts += i_pcr_offset;
i_ts %= TS_CLOCK_MAX;
return i_ts;
}
/*****************************************************************************
* Main loop
*****************************************************************************/
static void usage(const char *psz)
{
fprintf(stderr, "usage: %s [<mtu>] < <input file> [> <output>]\n", psz);
exit(EXIT_FAILURE);
}
int main(int i_argc, char **ppsz_argv)
{
if (i_argc > 2 || i_argc < 1 ||
(!strcmp(ppsz_argv[1], "-h") || !strcmp(ppsz_argv[1], "--help")))
usage(ppsz_argv[0]);
unsigned int i_mtu = TS_SIZE;
if (i_argc == 2) {
i_mtu = strtoul(ppsz_argv[1], NULL, 0);
if (!i_mtu)
usage(ppsz_argv[0]);
}
for ( ; ; ) {
uint8_t p_buffer[i_mtu];
ssize_t i_read = read(STDIN_FILENO, p_buffer, i_mtu);
uint64_t date = get_date();
if (i_read == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK)
continue;
exit(EXIT_FAILURE);
}
if (!i_read)
exit(EXIT_SUCCESS);
uint8_t *p_ts = p_buffer;
while (p_ts < p_buffer + i_mtu && ts_validate(p_ts)) {
if (ts_has_adaptation(p_ts) && ts_get_adaptation(p_ts) &&
tsaf_has_pcr(p_ts))
handle_pcr(p_ts, date);
uint16_t header_size = TS_HEADER_SIZE +
(ts_has_adaptation(p_ts) ? 1 : 0) +
ts_get_adaptation(p_ts);
if (ts_get_unitstart(p_ts) && ts_has_payload(p_ts) &&
header_size + PES_HEADER_SIZE_PTS <= TS_SIZE &&
pes_validate(p_ts + header_size) &&
pes_get_streamid(p_ts + header_size) !=
PES_STREAM_ID_PRIVATE_2 &&
pes_validate_header(p_ts + header_size) &&
pes_has_pts(p_ts + header_size) &&
pes_validate_pts(p_ts + header_size)) {
pes_set_pts(p_ts + header_size,
handle_ts(pes_get_pts(p_ts + header_size)));
if (header_size + PES_HEADER_SIZE_PTSDTS <= TS_SIZE &&
pes_has_dts(p_ts + header_size) &&
pes_validate_dts(p_ts + header_size))
pes_set_dts(p_ts + header_size,
handle_ts(pes_get_dts(p_ts + header_size)));
}
p_ts += TS_SIZE;
}
ssize_t i_written = write(STDOUT_FILENO, p_buffer, i_mtu);
if (i_written == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK)
continue;
exit(EXIT_FAILURE);
}
}
return EXIT_FAILURE;
}
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