/usr/include/vlc/plugins/vlc_timestamp_helper.h is in libvlccore-dev 3.0.1-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* vlc_timestamp_helper.h : timestamp handling helpers
*****************************************************************************
* Copyright (C) 2014 VLC authors and VideoLAN
* $Id: 90840fbcf7a5197f235ab6160a2cc2708a87c54d $
*
* Authors: Felix Abecassis <felix.abecassis@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifndef VLC_TIMESTAMP_H
#define VLC_TIMESTAMP_H 1
/* Implementation of a circular buffer of timestamps with overwriting
* of older values. MediaCodec has only one type of timestamp, if a
* block has no PTS, we send the DTS instead. Some hardware decoders
* cannot cope with this situation and output the frames in the wrong
* order. As a workaround in this case, we use a FIFO of timestamps in
* order to remember which input packets had no PTS. Since an
* hardware decoder can silently drop frames, this might cause a
* growing desynchronization with the actual timestamp. Thus the
* circular buffer has a limited size and will overwrite older values.
*/
typedef struct
{
uint32_t begin;
uint32_t size;
uint32_t capacity;
int64_t *buffer;
} timestamp_fifo_t;
static inline timestamp_fifo_t *timestamp_FifoNew(uint32_t capacity)
{
timestamp_fifo_t *fifo = calloc(1, sizeof(*fifo));
if (!fifo)
return NULL;
fifo->buffer = vlc_alloc(capacity, sizeof(*fifo->buffer));
if (!fifo->buffer) {
free(fifo);
return NULL;
}
fifo->capacity = capacity;
return fifo;
}
static inline void timestamp_FifoRelease(timestamp_fifo_t *fifo)
{
free(fifo->buffer);
free(fifo);
}
static inline bool timestamp_FifoIsEmpty(timestamp_fifo_t *fifo)
{
return fifo->size == 0;
}
static inline bool timestamp_FifoIsFull(timestamp_fifo_t *fifo)
{
return fifo->size == fifo->capacity;
}
static inline void timestamp_FifoEmpty(timestamp_fifo_t *fifo)
{
fifo->size = 0;
}
static inline void timestamp_FifoPut(timestamp_fifo_t *fifo, int64_t ts)
{
uint32_t end = (fifo->begin + fifo->size) % fifo->capacity;
fifo->buffer[end] = ts;
if (!timestamp_FifoIsFull(fifo))
fifo->size += 1;
else
fifo->begin = (fifo->begin + 1) % fifo->capacity;
}
static inline int64_t timestamp_FifoGet(timestamp_fifo_t *fifo)
{
if (timestamp_FifoIsEmpty(fifo))
return VLC_TS_INVALID;
int64_t result = fifo->buffer[fifo->begin];
fifo->begin = (fifo->begin + 1) % fifo->capacity;
fifo->size -= 1;
return result;
}
#endif
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