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mpv/stream/stream.c

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/*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifndef __MINGW32__
#include <sys/ioctl.h>
#include <sys/wait.h>
#endif
#include <fcntl.h>
#include <strings.h>
#include <assert.h>
#include <libavutil/intreadwrite.h>
#include <libavutil/common.h>
#include "talloc.h"
#include "config.h"
#include "core/bstr.h"
#include "core/mp_msg.h"
#include "osdep/timer.h"
#include "stream.h"
#include "demux/demux.h"
#include "core/m_option.h"
#include "core/m_struct.h"
// Includes additional padding in case sizes get rounded up by sector size.
#define TOTAL_BUFFER_SIZE (STREAM_MAX_BUFFER_SIZE + STREAM_MAX_SECTOR_SIZE)
/// We keep these 2 for the gui atm, but they will be removed.
char *cdrom_device = NULL;
char *dvd_device = NULL;
int dvd_title = 0;
struct input_ctx;
static int (*stream_check_interrupt_cb)(struct input_ctx *ctx, int time);
static struct input_ctx *stream_check_interrupt_ctx;
extern const stream_info_t stream_info_vcd;
extern const stream_info_t stream_info_cdda;
extern const stream_info_t stream_info_dvb;
extern const stream_info_t stream_info_tv;
extern const stream_info_t stream_info_radio;
extern const stream_info_t stream_info_pvr;
extern const stream_info_t stream_info_smb;
extern const stream_info_t stream_info_null;
extern const stream_info_t stream_info_memory;
extern const stream_info_t stream_info_mf;
extern const stream_info_t stream_info_ffmpeg;
extern const stream_info_t stream_info_avdevice;
extern const stream_info_t stream_info_file;
extern const stream_info_t stream_info_ifo;
extern const stream_info_t stream_info_dvd;
extern const stream_info_t stream_info_bluray;
static const stream_info_t *const auto_open_streams[] = {
#ifdef CONFIG_VCD
&stream_info_vcd,
#endif
#ifdef CONFIG_CDDA
&stream_info_cdda,
#endif
&stream_info_ffmpeg, // use for rstp:// before http fallback
&stream_info_avdevice,
#ifdef CONFIG_DVBIN
&stream_info_dvb,
#endif
#ifdef CONFIG_TV
&stream_info_tv,
#endif
#ifdef CONFIG_RADIO
&stream_info_radio,
#endif
#ifdef CONFIG_PVR
&stream_info_pvr,
#endif
#ifdef CONFIG_LIBSMBCLIENT
&stream_info_smb,
#endif
#ifdef CONFIG_DVDREAD
&stream_info_ifo,
&stream_info_dvd,
#endif
#ifdef CONFIG_LIBBLURAY
&stream_info_bluray,
#endif
&stream_info_memory,
&stream_info_null,
&stream_info_mf,
&stream_info_file,
NULL
};
static stream_t *new_stream(size_t min_size);
static int stream_seek_unbuffered(stream_t *s, int64_t newpos);
static stream_t *open_stream_plugin(const stream_info_t *sinfo,
const char *filename, int mode,
struct MPOpts *options, int *ret)
{
void *arg = NULL;
stream_t *s;
m_struct_t *desc = (m_struct_t *)sinfo->opts;
// Parse options
if (desc) {
arg = m_struct_alloc(desc);
if (sinfo->opts_url) {
m_option_t url_opt = { "stream url", arg, CONF_TYPE_CUSTOM_URL, 0,
0, 0, (void *)sinfo->opts };
if (m_option_parse(&url_opt, bstr0("stream url"), bstr0(filename),
arg) < 0)
{
mp_tmsg(MSGT_OPEN, MSGL_ERR, "URL parsing failed on url %s\n",
filename);
m_struct_free(desc, arg);
*ret = STREAM_ERROR;
return NULL;
}
}
}
s = new_stream(0);
s->opts = options;
s->url = talloc_strdup(s, filename);
s->flags = 0;
s->mode = mode;
*ret = sinfo->open(s, mode, arg);
if ((*ret) != STREAM_OK) {
talloc_free(s);
return NULL;
}
if (!s->read_chunk)
s->read_chunk = 4 * (s->sector_size ? s->sector_size : STREAM_BUFFER_SIZE);
if (!s->seek)
s->flags &= ~MP_STREAM_SEEK;
if (s->seek && !(s->flags & MP_STREAM_SEEK))
s->flags |= MP_STREAM_SEEK;
s->mode = mode;
s->uncached_type = s->type;
mp_msg(MSGT_OPEN, MSGL_V, "[stream] [%s] %s\n", sinfo->name, filename);
if (s->mime_type)
mp_msg(MSGT_OPEN, MSGL_V, "Mime-type: '%s'\n", s->mime_type);
return s;
}
static stream_t *open_stream_full(const char *filename, int mode,
struct MPOpts *options)
{
int i, j, l, r;
const stream_info_t *sinfo;
stream_t *s;
assert(filename);
for (i = 0; auto_open_streams[i]; i++) {
sinfo = auto_open_streams[i];
if (!sinfo->protocols) {
mp_msg(MSGT_OPEN, MSGL_WARN,
"Stream type %s has protocols == NULL, it's a bug\n",
sinfo->name);
continue;
}
for (j = 0; sinfo->protocols[j]; j++) {
l = strlen(sinfo->protocols[j]);
// l == 0 => Don't do protocol matching (ie network and filenames)
if ((l == 0 && !strstr(filename, "://")) ||
((strncasecmp(sinfo->protocols[j], filename, l) == 0) &&
(strncmp("://", filename + l, 3) == 0))) {
s = open_stream_plugin(sinfo, filename, mode, options, &r);
if (s)
return s;
if (r != STREAM_UNSUPPORTED) {
mp_tmsg(MSGT_OPEN, MSGL_ERR, "Failed to open %s.\n",
filename);
return NULL;
}
break;
}
}
}
mp_tmsg(MSGT_OPEN, MSGL_ERR, "No stream found to handle url %s\n", filename);
return NULL;
}
struct stream *stream_open(const char *filename, struct MPOpts *options)
{
return open_stream_full(filename, STREAM_READ, options);
}
stream_t *open_output_stream(const char *filename, struct MPOpts *options)
{
return open_stream_full(filename, STREAM_WRITE, options);
}
static int stream_reconnect(stream_t *s)
{
#define MAX_RECONNECT_RETRIES 5
#define RECONNECT_SLEEP_MS 1000
if (!s->streaming)
return 0;
int64_t pos = s->pos;
for (int retry = 0; retry < MAX_RECONNECT_RETRIES; retry++) {
mp_msg(MSGT_STREAM, MSGL_WARN,
"Connection lost! Attempting to reconnect (%d)...\n", retry + 1);
if (stream_check_interrupt(retry ? RECONNECT_SLEEP_MS : 0))
return 0;
s->eof = 1;
s->pos = 0;
s->buf_pos = s->buf_len = 0;
int r = stream_control(s, STREAM_CTRL_RECONNECT, NULL);
if (r == STREAM_UNSUPPORTED)
return 0;
if (r != STREAM_OK)
continue;
if (stream_seek_unbuffered(s, pos) < 0 && s->pos == pos)
return 1;
}
return 0;
}
void stream_set_capture_file(stream_t *s, const char *filename)
{
if (!bstr_equals(bstr0(s->capture_filename), bstr0(filename))) {
if (s->capture_file)
fclose(s->capture_file);
talloc_free(s->capture_filename);
s->capture_file = NULL;
s->capture_filename = NULL;
if (filename) {
s->capture_file = fopen(filename, "wb");
if (s->capture_file) {
s->capture_filename = talloc_strdup(NULL, filename);
} else {
mp_tmsg(MSGT_GLOBAL, MSGL_ERR,
"Error opening capture file: %s\n", strerror(errno));
}
}
}
}
static void stream_capture_write(stream_t *s, void *buf, size_t len)
{
if (s->capture_file && len > 0) {
if (fwrite(buf, len, 1, s->capture_file) < 1) {
mp_tmsg(MSGT_GLOBAL, MSGL_ERR, "Error writing capture file: %s\n",
strerror(errno));
stream_set_capture_file(s, NULL);
}
}
}
// Read function bypassing the local stream buffer. This will not write into
// s->buffer, but into buf[0..len] instead.
// Returns < 0 on error, 0 on EOF, and length of bytes read on success.
// Partial reads are possible, even if EOF is not reached.
static int stream_read_unbuffered(stream_t *s, void *buf, int len)
{
int orig_len = len;
s->buf_pos = s->buf_len = 0;
// we will retry even if we already reached EOF previously.
len = s->fill_buffer ? s->fill_buffer(s, buf, len) : -1;
if (len < 0)
len = 0;
if (len == 0) {
// do not retry if this looks like proper eof
if (s->eof || (s->end_pos && s->pos == s->end_pos))
goto eof_out;
// just in case this is an error e.g. due to network
// timeout reset and retry
if (!stream_reconnect(s))
goto eof_out;
// make sure EOF is set to ensure no endless loops
s->eof = 1;
return stream_read_unbuffered(s, buf, orig_len);
eof_out:
s->eof = 1;
return 0;
}
// When reading succeeded we are obviously not at eof.
s->eof = 0;
s->pos += len;
stream_capture_write(s, buf, len);
return len;
}
int stream_fill_buffer(stream_t *s)
{
int len = s->sector_size ? s->sector_size : STREAM_BUFFER_SIZE;
len = stream_read_unbuffered(s, s->buffer, len);
s->buf_pos = 0;
s->buf_len = len;
return s->buf_len;
}
// Read between 1..buf_size bytes of data, return how much data has been read.
// Return 0 on EOF, error, of if buf_size was 0.
int stream_read_partial(stream_t *s, char *buf, int buf_size)
{
assert(s->buf_pos <= s->buf_len);
assert(buf_size >= 0);
if (s->buf_pos == s->buf_len && buf_size > 0) {
s->buf_pos = s->buf_len = 0;
// Do a direct read, but only if there's no sector alignment requirement
// Also, small reads will be more efficient with buffering & copying
if (!s->sector_size && buf_size >= STREAM_BUFFER_SIZE)
return stream_read_unbuffered(s, buf, buf_size);
if (!stream_fill_buffer(s))
return 0;
}
int len = FFMIN(buf_size, s->buf_len - s->buf_pos);
memcpy(buf, &s->buffer[s->buf_pos], len);
s->buf_pos += len;
if (len > 0)
s->eof = 0;
return len;
}
int stream_read(stream_t *s, char *mem, int total)
{
int len = total;
while (len > 0) {
int read = stream_read_partial(s, mem, len);
if (read <= 0)
break; // EOF
mem += read;
len -= read;
}
total -= len;
if (total > 0)
s->eof = 0;
return total;
}
// Read ahead at most len bytes without changing the read position. Return a
// pointer to the internal buffer, starting from the current read position.
// Can read ahead at most STREAM_MAX_BUFFER_SIZE bytes.
// The returned buffer becomes invalid on the next stream call, and you must
// not write to it.
struct bstr stream_peek(stream_t *s, int len)
{
assert(len >= 0);
assert(len <= STREAM_MAX_BUFFER_SIZE);
if (s->buf_len - s->buf_pos < len) {
// Move to front to guarantee we really can read up to max size.
int buf_valid = s->buf_len - s->buf_pos;
memmove(s->buffer, &s->buffer[s->buf_pos], buf_valid);
// Fill rest of the buffer.
while (buf_valid < len) {
int chunk = len - buf_valid;
if (s->sector_size)
chunk = STREAM_BUFFER_SIZE;
assert(buf_valid + chunk <= TOTAL_BUFFER_SIZE);
int read = stream_read_unbuffered(s, &s->buffer[buf_valid], chunk);
if (read == 0)
break; // EOF
buf_valid += read;
}
s->buf_pos = 0;
s->buf_len = buf_valid;
if (s->buf_len)
s->eof = 0;
}
return (bstr){.start = &s->buffer[s->buf_pos],
.len = FFMIN(len, s->buf_len - s->buf_pos)};
}
int stream_write_buffer(stream_t *s, unsigned char *buf, int len)
{
int rd;
if (!s->write_buffer)
return -1;
rd = s->write_buffer(s, buf, len);
if (rd < 0)
return -1;
s->pos += rd;
assert(rd == len && "stream_write_buffer(): unexpected short write");
return rd;
}
// Seek function bypassing the local stream buffer.
static int stream_seek_unbuffered(stream_t *s, int64_t newpos)
{
if (newpos != s->pos) {
if (!s->seek || !(s->flags & MP_STREAM_SEEK)) {
mp_tmsg(MSGT_STREAM, MSGL_ERR, "Can not seek in this stream\n");
return 0;
}
if (newpos < s->pos && !(s->flags & MP_STREAM_SEEK_BW)) {
mp_tmsg(MSGT_STREAM, MSGL_ERR,
"Cannot seek backward in linear streams!\n");
return 1;
}
if (s->seek(s, newpos) <= 0) {
mp_tmsg(MSGT_STREAM, MSGL_ERR, "Seek failed\n");
return 0;
}
}
s->eof = 0; // EOF reset when seek succeeds.
return -1;
}
// Unlike stream_seek, does not try to seek within local buffer.
// Unlike stream_seek_unbuffered(), it still fills the local buffer.
static int stream_seek_long(stream_t *s, int64_t pos)
{
int64_t oldpos = s->pos;
s->buf_pos = s->buf_len = 0;
s->eof = 0;
if (s->mode == STREAM_WRITE) {
if (!s->seek || !s->seek(s, pos))
return 0;
return 1;
}
int64_t newpos = pos;
if (s->sector_size)
newpos = (pos / s->sector_size) * s->sector_size;
mp_msg(MSGT_STREAM, MSGL_DBG3, "s->pos=%" PRIX64 " newpos=%" PRIX64
" new_bufpos=%" PRIX64 " buflen=%X \n",
(int64_t)s->pos, (int64_t)newpos, (int64_t)pos, s->buf_len);
pos -= newpos;
if (stream_seek_unbuffered(s, newpos) >= 0) {
s->pos = oldpos;
return 0;
}
while (s->pos < newpos) {
if (stream_fill_buffer(s) <= 0)
break; // EOF
}
while (stream_fill_buffer(s) > 0) {
if (pos <= s->buf_len) {
s->buf_pos = pos; // byte position in sector
s->eof = 0;
return 1;
}
pos -= s->buf_len;
}
// Fill failed, but seek still is a success (partially).
s->buf_pos = 0;
s->buf_len = 0;
s->eof = 0; // eof should be set only on read
mp_msg(MSGT_STREAM, MSGL_V,
"stream_seek: Seek to/past EOF: no buffer preloaded.\n");
return 1;
}
int stream_seek(stream_t *s, int64_t pos)
{
mp_dbg(MSGT_DEMUX, MSGL_DBG3, "seek to 0x%llX\n", (long long)pos);
if (pos < 0) {
mp_msg(MSGT_DEMUX, MSGL_ERR, "Invalid seek to negative position %llx!\n",
(long long)pos);
pos = 0;
}
if (pos < s->pos) {
int64_t x = pos - (s->pos - (int)s->buf_len);
if (x >= 0) {
s->buf_pos = x;
s->eof = 0;
return 1;
}
}
return stream_seek_long(s, pos);
}
int stream_skip(stream_t *s, int64_t len)
{
int64_t target = stream_tell(s) + len;
if (len < 0)
return stream_seek(s, target);
if (len > 2 * STREAM_BUFFER_SIZE && (s->flags & MP_STREAM_SEEK_FW)) {
// Seek to 1 byte before target - this is the only way to distinguish
// skip-to-EOF and skip-past-EOF in general. Successful seeking means
// absolutely nothing, so test by doing a real read of the last byte.
int r = stream_seek(s, target - 1);
if (r) {
stream_read_char(s);
return !stream_eof(s) && stream_tell(s) == target;
}
return r;
}
while (len > 0) {
int x = s->buf_len - s->buf_pos;
if (x == 0) {
if (!stream_fill_buffer(s))
return 0; // EOF
x = s->buf_len - s->buf_pos;
}
if (x > len)
x = len;
s->buf_pos += x;
len -= x;
}
return 1;
}
int stream_control(stream_t *s, int cmd, void *arg)
{
if (!s->control)
return STREAM_UNSUPPORTED;
return s->control(s, cmd, arg);
}
void stream_update_size(stream_t *s)
{
uint64_t size;
if (stream_control(s, STREAM_CTRL_GET_SIZE, &size) == STREAM_OK) {
if (size > s->end_pos)
s->end_pos = size;
}
}
static stream_t *new_stream(size_t min_size)
{
min_size = FFMAX(min_size, TOTAL_BUFFER_SIZE);
stream_t *s = talloc_size(NULL, sizeof(stream_t) + min_size);
memset(s, 0, sizeof(stream_t));
return s;
}
void free_stream(stream_t *s)
{
if (!s)
return;
stream_set_capture_file(s, NULL);
if (s->close)
s->close(s);
free_stream(s->uncached_stream);
talloc_free(s);
}
void stream_set_interrupt_callback(int (*cb)(struct input_ctx *, int),
struct input_ctx *ctx)
{
stream_check_interrupt_cb = cb;
stream_check_interrupt_ctx = ctx;
}
int stream_check_interrupt(int time)
{
if (!stream_check_interrupt_cb) {
mp_sleep_us(time * 1000);
return 0;
}
return stream_check_interrupt_cb(stream_check_interrupt_ctx, time);
}
stream_t *open_memory_stream(void *data, int len)
{
assert(len >= 0);
stream_t *s = stream_open("memory://", NULL);
assert(s);
stream_control(s, STREAM_CTRL_SET_CONTENTS, &(bstr){data, len});
return s;
}
static int stream_enable_cache(stream_t **stream, int64_t size, int64_t min,
int64_t seek_limit);
/**
* \return 1 on success, 0 if the function was interrupted and -1 on error, or
* if the cache is disabled
*/
int stream_enable_cache_percent(stream_t **stream, int64_t stream_cache_size,
int64_t stream_cache_def_size,
float stream_cache_min_percent,
float stream_cache_seek_min_percent)
{
if (stream_cache_size == -1)
stream_cache_size = (*stream)->streaming ? stream_cache_def_size : 0;
stream_cache_size = stream_cache_size * 1024; // input is in KiB
return stream_enable_cache(stream, stream_cache_size,
stream_cache_size *
(stream_cache_min_percent / 100.0),
stream_cache_size *
(stream_cache_seek_min_percent / 100.0));
}
static int stream_enable_cache(stream_t **stream, int64_t size, int64_t min,
int64_t seek_limit)
{
stream_t *orig = *stream;
if (orig->mode != STREAM_READ)
return 1;
// Can't handle a loaded buffer.
orig->buf_len = orig->buf_pos = 0;
stream_t *cache = new_stream(0);
cache->uncached_type = orig->type;
cache->uncached_stream = orig;
cache->flags |= MP_STREAM_SEEK;
cache->mode = STREAM_READ;
cache->read_chunk = 4 * STREAM_BUFFER_SIZE;
cache->url = talloc_strdup(cache, orig->url);
cache->mime_type = talloc_strdup(cache, orig->mime_type);
cache->lavf_type = talloc_strdup(cache, orig->lavf_type);
cache->opts = orig->opts;
cache->start_pos = orig->start_pos;
cache->end_pos = orig->end_pos;
int res = -1;
#ifdef CONFIG_STREAM_CACHE
res = stream_cache_init(cache, orig, size, min, seek_limit);
#endif
if (res <= 0) {
cache->uncached_stream = NULL; // don't free original stream
free_stream(cache);
} else {
*stream = cache;
}
return res;
}
/**
* Helper function to read 16 bits little-endian and advance pointer
*/
static uint16_t get_le16_inc(const uint8_t **buf)
{
uint16_t v = AV_RL16(*buf);
*buf += 2;
return v;
}
/**
* Helper function to read 16 bits big-endian and advance pointer
*/
static uint16_t get_be16_inc(const uint8_t **buf)
{
uint16_t v = AV_RB16(*buf);
*buf += 2;
return v;
}
/**
* Find a newline character in buffer
* \param buf buffer to search
* \param len amount of bytes to search in buffer, may not overread
* \param utf16 chose between UTF-8/ASCII/other and LE and BE UTF-16
* 0 = UTF-8/ASCII/other, 1 = UTF-16-LE, 2 = UTF-16-BE
*/
static const uint8_t *find_newline(const uint8_t *buf, int len, int utf16)
{
uint32_t c;
const uint8_t *end = buf + len;
switch (utf16) {
case 0:
return (uint8_t *)memchr(buf, '\n', len);
case 1:
while (buf < end - 1) {
GET_UTF16(c, buf < end - 1 ? get_le16_inc(&buf) : 0, return NULL;)
if (buf <= end && c == '\n')
return buf - 1;
}
break;
case 2:
while (buf < end - 1) {
GET_UTF16(c, buf < end - 1 ? get_be16_inc(&buf) : 0, return NULL;)
if (buf <= end && c == '\n')
return buf - 1;
}
break;
}
return NULL;
}
#define EMPTY_STMT do{}while(0);
/**
* Copy a number of bytes, converting to UTF-8 if input is UTF-16
* \param dst buffer to copy to
* \param dstsize size of dst buffer
* \param src buffer to copy from
* \param len amount of bytes to copy from src
* \param utf16 chose between UTF-8/ASCII/other and LE and BE UTF-16
* 0 = UTF-8/ASCII/other, 1 = UTF-16-LE, 2 = UTF-16-BE
*/
static int copy_characters(uint8_t *dst, int dstsize,
const uint8_t *src, int *len, int utf16)
{
uint32_t c;
uint8_t *dst_end = dst + dstsize;
const uint8_t *end = src + *len;
switch (utf16) {
case 0:
if (*len > dstsize)
*len = dstsize;
memcpy(dst, src, *len);
return *len;
case 1:
while (src < end - 1 && dst_end - dst > 8) {
uint8_t tmp;
GET_UTF16(c, src < end - 1 ? get_le16_inc(&src) : 0, EMPTY_STMT)
PUT_UTF8(c, tmp, *dst++ = tmp; EMPTY_STMT)
}
*len -= end - src;
return dstsize - (dst_end - dst);
case 2:
while (src < end - 1 && dst_end - dst > 8) {
uint8_t tmp;
GET_UTF16(c, src < end - 1 ? get_be16_inc(&src) : 0, EMPTY_STMT)
PUT_UTF8(c, tmp, *dst++ = tmp; EMPTY_STMT)
}
*len -= end - src;
return dstsize - (dst_end - dst);
}
return 0;
}
unsigned char *stream_read_line(stream_t *s, unsigned char *mem, int max,
int utf16)
{
int len;
const unsigned char *end;
unsigned char *ptr = mem;
if (max < 1)
return NULL;
max--; // reserve one for 0-termination
do {
len = s->buf_len - s->buf_pos;
// try to fill the buffer
if (len <= 0 &&
(!stream_fill_buffer(s) ||
(len = s->buf_len - s->buf_pos) <= 0))
break;
end = find_newline(s->buffer + s->buf_pos, len, utf16);
if (end)
len = end - (s->buffer + s->buf_pos) + 1;
if (len > 0 && max > 0) {
int l = copy_characters(ptr, max, s->buffer + s->buf_pos, &len,
utf16);
max -= l;
ptr += l;
if (!len)
break;
}
s->buf_pos += len;
} while (!end);
ptr[0] = 0;
if (s->eof && ptr == mem)
return NULL;
return mem;
}
// Read the rest of the stream into memory (current pos to EOF), and return it.
// talloc_ctx: used as talloc parent for the returned allocation
// max_size: must be set to >0. If the file is larger than that, it is treated
// as error. This is a minor robustness measure.
// returns: stream contents, or .start/.len set to NULL on error
// If the file was empty, but no error happened, .start will be non-NULL and
// .len will be 0.
// For convenience, the returned buffer is padded with a 0 byte. The padding
// is not included in the returned length.
struct bstr stream_read_complete(struct stream *s, void *talloc_ctx,
int max_size)
{
if (max_size > 1000000000)
abort();
int bufsize;
int total_read = 0;
int padding = 1;
char *buf = NULL;
if (s->end_pos > max_size)
return (struct bstr){NULL, 0};
if (s->end_pos > 0)
bufsize = s->end_pos + padding;
else
bufsize = 1000;
while (1) {
buf = talloc_realloc_size(talloc_ctx, buf, bufsize);
int readsize = stream_read(s, buf + total_read, bufsize - total_read);
total_read += readsize;
if (total_read < bufsize)
break;
if (bufsize > max_size) {
talloc_free(buf);
return (struct bstr){NULL, 0};
}
bufsize = FFMIN(bufsize + (bufsize >> 1), max_size + padding);
}
buf = talloc_realloc_size(talloc_ctx, buf, total_read + padding);
memset(&buf[total_read], 0, padding);
return (struct bstr){buf, total_read};
}
bool stream_manages_timeline(struct stream *s)
{
return stream_control(s, STREAM_CTRL_MANAGES_TIMELINE, NULL) == STREAM_OK;
}
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