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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"
#if HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
#include "core/bstr.h"
#include "core/mp_msg.h"
#include "osdep/shmem.h"
#include "osdep/timer.h"
#include "network.h"
#include "stream.h"
#include "demux/demux.h"
#include "core/m_option.h"
#include "core/m_struct.h"
#include "cache2.h"
/// We keep these 2 for the gui atm, but they will be removed.
int vcd_track = 0;
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_asf;
extern const stream_info_t stream_info_udp;
extern const stream_info_t stream_info_http1;
extern const stream_info_t stream_info_http2;
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_ftp;
extern const stream_info_t stream_info_vstream;
extern const stream_info_t stream_info_smb;
extern const stream_info_t stream_info_null;
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_NETWORKING
&stream_info_http1,
&stream_info_asf,
&stream_info_udp,
&stream_info_http2,
#endif
#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_FTP
&stream_info_ftp,
#endif
#ifdef CONFIG_VSTREAM
&stream_info_vstream,
#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_null,
&stream_info_mf,
&stream_info_file,
NULL
};
static stream_t *new_stream(int fd, int type);
static stream_t *open_stream_plugin(const stream_info_t *sinfo,
const char *filename,
int mode, struct MPOpts *options,
int *file_format, int *ret,
char **redirected_url)
{
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(-2, -2);
s->opts = options;
s->url = strdup(filename);
s->flags |= mode;
*ret = sinfo->open(s, mode, arg, file_format);
if ((*ret) != STREAM_OK) {
#ifdef CONFIG_NETWORKING
if (*ret == STREAM_REDIRECTED && redirected_url) {
if (s->streaming_ctrl && s->streaming_ctrl->url
&& s->streaming_ctrl->url->url)
*redirected_url = strdup(s->streaming_ctrl->url->url);
else
*redirected_url = NULL;
}
streaming_ctrl_free(s->streaming_ctrl);
#endif
free(s->url);
talloc_free(s);
return NULL;
}
if (s->streaming && !s->cache_size) {
// Set default cache size to use if user does not specify it.
s->cache_size = 320;
}
if (s->type <= -2)
mp_msg(MSGT_OPEN, MSGL_WARN, "Warning streams need a type !!!!\n");
if (s->flags & MP_STREAM_SEEK && !s->seek)
s->flags &= ~MP_STREAM_SEEK;
if (s->seek && !(s->flags & MP_STREAM_SEEK))
s->flags |= MP_STREAM_SEEK;
s->mode = mode;
mp_msg(MSGT_OPEN, MSGL_V, "STREAM: [%s] %s\n", sinfo->name, filename);
mp_msg(MSGT_OPEN, MSGL_V, "STREAM: Description: %s\n", sinfo->info);
mp_msg(MSGT_OPEN, MSGL_V, "STREAM: Author: %s\n", sinfo->author);
mp_msg(MSGT_OPEN, MSGL_V, "STREAM: Comment: %s\n", sinfo->comment);
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 *file_format)
{
int i, j, l, r;
const stream_info_t *sinfo;
stream_t *s;
char *redirected_url = NULL;
assert(filename);
int dummy;
if (!file_format)
file_format = &dummy;
*file_format = DEMUXER_TYPE_UNKNOWN;
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))) {
*file_format = DEMUXER_TYPE_UNKNOWN;
s =
open_stream_plugin(sinfo, filename, mode, options,
file_format,
&r,
&redirected_url);
if (s)
return s;
if (r == STREAM_REDIRECTED && redirected_url) {
mp_msg(MSGT_OPEN, MSGL_V, "[%s] open %s redirected to %s\n",
sinfo->info, filename, redirected_url);
s = open_stream_full(redirected_url, mode, options,
file_format);
free(redirected_url);
return s;
} else 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;
}
stream_t *open_stream(const char *filename, struct MPOpts *options,
int *file_format)
{
return open_stream_full(filename, STREAM_READ, options, file_format);
}
stream_t *open_output_stream(const char *filename, struct MPOpts *options)
{
return open_stream_full(filename, STREAM_WRITE, options, NULL);
}
//=================== STREAMER =========================
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...\n");
if (retry)
mp_sleep_us(RECONNECT_SLEEP_MS * 1000);
s->eof = 1;
stream_reset(s);
// Some streams (internal http.c) don't support STREAM_CTRL_RECONNECT,
// but do it when trying to seek.
if (s->control) {
if (s->control(s, STREAM_CTRL_RECONNECT, NULL) == STREAM_ERROR)
continue;
}
if (stream_seek_internal(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));
}
}
}
}
void stream_capture_write(stream_t *s)
{
if (s->capture_file) {
if (fwrite(s->buffer, s->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);
}
}
}
int stream_read_internal(stream_t *s, void *buf, int len)
{
int orig_len = len;
// we will retry even if we already reached EOF previously.
switch (s->type) {
case STREAMTYPE_STREAM:
if (s->streaming_ctrl != NULL && s->streaming_ctrl->streaming_read) {
len = s->streaming_ctrl->streaming_read(s->fd, buf, len,
s->streaming_ctrl);
if (s->streaming_ctrl->status == streaming_stopped_e &&
(!s->end_pos || s->pos == s->end_pos))
s->eof = 1;
} else {
if (s->fill_buffer)
len = s->fill_buffer(s, buf, len);
else
len = read(s->fd, buf, len);
}
break;
default:
len = s->fill_buffer ? s->fill_buffer(s, buf, 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_internal(s, buf, orig_len);
eof_out:
s->eof = 1;
return 0;
}
// When reading succeeded we are obviously not at eof.
// This e.g. avoids issues with eof getting stuck when lavf seeks in MPEG-TS
s->eof = 0;
s->pos += len;
return len;
}
int stream_fill_buffer(stream_t *s)
{
int len = stream_read_internal(s, s->buffer, STREAM_BUFFER_SIZE);
if (len <= 0)
return 0;
s->buf_pos = 0;
s->buf_len = len;
// printf("[%d]",len);fflush(stdout);
stream_capture_write(s);
return len;
}
int stream_read(stream_t *s, char *mem, int total)
{
int len = total;
while (len > 0) {
int x;
x = s->buf_len - s->buf_pos;
if (x == 0) {
if (!cache_stream_fill_buffer(s))
return total - len; // EOF
x = s->buf_len - s->buf_pos;
}
if (s->buf_pos > s->buf_len)
mp_msg(MSGT_DEMUX, MSGL_WARN,
"stream_read: WARNING! s->buf_pos>s->buf_len\n");
if (x > len)
x = len;
memcpy(mem, &s->buffer[s->buf_pos], x);
s->buf_pos += x;
mem += x;
len -= x;
}
return total;
}
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;
}
int stream_seek_internal(stream_t *s, int64_t newpos)
{
if (newpos == 0 || newpos != s->pos) {
switch (s->type) {
case STREAMTYPE_STREAM:
//s->pos=newpos; // real seek
// Some streaming protocol allow to seek backward and forward
// A function call that return -1 can tell that the protocol
// doesn't support seeking.
#ifdef CONFIG_NETWORKING
if (s->seek) { // new stream seek is much cleaner than streaming_ctrl one
if (!s->seek(s, newpos)) {
mp_tmsg(MSGT_STREAM, MSGL_ERR, "Seek failed\n");
return 0;
}
break;
}
if (s->streaming_ctrl != NULL &&
s->streaming_ctrl->streaming_seek) {
if (s->streaming_ctrl->streaming_seek(s->fd, newpos,
s->streaming_ctrl) < 0) {
mp_tmsg(MSGT_STREAM, MSGL_INFO, "Stream not seekable!\n");
return 1;
}
break;
}
#endif
if (newpos < s->pos) {
mp_tmsg(MSGT_STREAM, MSGL_INFO,
"Cannot seek backward in linear streams!\n");
return 1;
}
break;
default:
// This should at the beginning as soon as all streams are converted
if (!s->seek)
return 0;
// Now seek
if (!s->seek(s, newpos)) {
mp_tmsg(MSGT_STREAM, MSGL_ERR, "Seek failed\n");
return 0;
}
}
// putchar('.');fflush(stdout);
//} else {
// putchar('%');fflush(stdout);
}
return -1;
}
int stream_seek_long(stream_t *s, int64_t pos)
{
int res;
int64_t newpos = 0;
// if( mp_msg_test(MSGT_STREAM,MSGL_DBG3) ) printf("seek_long to 0x%X\n",(unsigned int)pos);
s->buf_pos = s->buf_len = 0;
if (s->mode == STREAM_WRITE) {
if (!s->seek || !s->seek(s, pos))
return 0;
return 1;
}
if (s->sector_size)
newpos = (pos / s->sector_size) * s->sector_size;
else
newpos = pos & (~((int64_t)STREAM_BUFFER_SIZE - 1));
if (mp_msg_test(MSGT_STREAM, MSGL_DBG3)) {
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;
res = stream_seek_internal(s, newpos);
if (res >= 0)
return res;
while (s->pos < newpos) {
if (stream_fill_buffer(s) <= 0)
break; // EOF
}
s->eof = 0; // EOF reset when seek succeeds.
while (stream_fill_buffer(s) > 0) {
if (pos <= s->buf_len) {
s->buf_pos = pos; // byte position in sector
return 1;
}
pos -= s->buf_len;
}
// Fill failed, but seek still is a success.
s->pos += pos;
s->buf_pos = 0;
s->buf_len = 0;
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 - s->buf_len);
if (x >= 0) {
s->buf_pos = x;
s->eof = 0;
// putchar('*');fflush(stdout);
return 1;
}
}
return cache_stream_seek_long(s, pos);
}
int stream_skip(stream_t *s, int64_t len)
{
if (len < 0 ||
(len > 2 * STREAM_BUFFER_SIZE && (s->flags & MP_STREAM_SEEK_FW))) {
// negative or big skip!
return stream_seek(s, stream_tell(s) + len);
}
while (len > 0) {
int x = s->buf_len - s->buf_pos;
if (x == 0) {
if (!cache_stream_fill_buffer(s))
return 0; // EOF
x = s->buf_len - s->buf_pos;
}
if (x > len)
x = len;
//memcpy(mem,&s->buf[s->buf_pos],x);
s->buf_pos += x;
len -= x;
}
return 1;
}
void stream_reset(stream_t *s)
{
if (s->eof) {
s->pos = 0;
s->buf_pos = s->buf_len = 0;
s->eof = 0;
}
}
int stream_control(stream_t *s, int cmd, void *arg)
{
#ifdef CONFIG_STREAM_CACHE
if (s->cache_pid)
return cache_do_control(s, cmd, arg);
#endif
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(int fd, int type)
{
stream_t *s = talloc_zero(NULL, stream_t);
#if HAVE_WINSOCK2_H
{
WSADATA wsdata;
int temp = WSAStartup(0x0202, &wsdata); // there might be a better place for this (-> later)
mp_msg(MSGT_STREAM, MSGL_V, "WINSOCK2 init: %i\n", temp);
}
#endif
s->fd = fd;
s->type = type;
stream_reset(s);
return s;
}
void free_stream(stream_t *s)
{
// printf("\n*** free_stream() called ***\n");
#ifdef CONFIG_STREAM_CACHE
cache_uninit(s);
#endif
stream_set_capture_file(s, NULL);
if (s->close)
s->close(s);
if (s->fd > 0) {
/* on unix we define closesocket to close
on windows however we have to distinguish between
network socket and file */
if (s->url && strstr(s->url, "://"))
closesocket(s->fd);
else
close(s->fd);
}
#if HAVE_WINSOCK2_H
mp_msg(MSGT_STREAM, MSGL_V, "WINSOCK2 uninit\n");
WSACleanup(); // there might be a better place for this (-> later)
#endif
free(s->url);
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);
}
/**
* 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 &&
(!cache_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;
}
struct bstr stream_read_complete(struct stream *s, void *talloc_ctx,
int max_size, int padding_bytes)
{
if (max_size > 1000000000)
abort();
int bufsize;
int total_read = 0;
int padding = FFMAX(padding_bytes, 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);
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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