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236577af09
mpv/stream/stream.c
wm4 236577af09 cache: use threads instead of fork() 
Basically rewrite all the code supporting the cache (i.e. anything other
than the ringbuffer logic). The underlying design is untouched.

Note that the old cache2.c (on which this code is based) already had a
threading implementation. This was mostly unused on Linux, and had some
problems, such as using shared volatile variables for communication and
uninterruptible timeouts, instead of using locks for synchronization.

This commit does use proper locking, while still retaining the way the
old cache worked. It's basically a big refactor.

Simplify the code too. Since we don't need to copy stream ctrl args
anymore (we're always guaranteed a shared address space now), lots of
annoying code just goes away. Likewise, we don't need to care about
sector sizes. The cache uses the high-level stream API to read from
other streams, and sector sizes are handled transparently.
2013-06-16 22:05:09 +02:00

958 lines
28 KiB
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"
// 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_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(void);
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 *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();
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->read_chunk)
s->read_chunk = 4 * (s->sector_size ? s->sector_size : STREAM_BUFFER_SIZE);
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->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);
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_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.
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_unbuffered(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;
stream_capture_write(s, buf, len);
return len;
}
// This works like stdio's ungetc(), but for more than one byte. Rewind the
// file position by buffer_size, and make all future reads/buffer fills read
// from the given buffer, until the buffer is exhausted or a seek outside of
// the buffer happens.
// You can unread at most STREAM_MAX_BUFFER_SIZE bytes.
void stream_unread_buffer(stream_t *s, void *buffer, size_t buffer_size)
{
assert(stream_tell(s) >= buffer_size); // can't unread to before file start
assert(buffer_size <= STREAM_MAX_BUFFER_SIZE);
// Need to include the remaining buffer to ensure no data is lost.
int remainder = s->buf_len - s->buf_pos;
// Successive buffer unreading might trigger this.
assert(buffer_size + remainder <= TOTAL_BUFFER_SIZE);
memmove(&s->buffer[buffer_size], &s->buffer[s->buf_pos], remainder);
memcpy(s->buffer, buffer, buffer_size);
s->buf_pos = 0;
s->buf_len = buffer_size + remainder;
s->eof = 0;
}
int stream_fill_buffer(stream_t *s)
{
int len = stream_read_unbuffered(s, s->buffer, STREAM_BUFFER_SIZE);
if (len <= 0)
return 0;
s->buf_pos = 0;
s->buf_len = len;
return 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;
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;
}
return total - len;
}
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 == 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;
}
// 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)
{
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));
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_unbuffered(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 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 (!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)
{
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(void)
{
stream_t *s = talloc_size(NULL, sizeof(stream_t) + TOTAL_BUFFER_SIZE);
memset(s, 0, sizeof(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 = -2;
s->type = -2;
return s;
}
void free_stream(stream_t *s)
{
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);
if (s->uncached_stream)
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);
}
int stream_enable_cache_percent(stream_t **stream, int64_t stream_cache_size,
float stream_cache_min_percent,
float stream_cache_seek_min_percent)
{
if (stream_cache_size == -1)
stream_cache_size = (*stream)->cache_size;
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));
}
/**
* \return 1 on success, 0 if the function was interrupted and -1 on error, or
* if the cache is disabled
*/
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();
cache->type = STREAMTYPE_CACHE;
cache->uncached_type = orig->type;
cache->uncached_stream = orig;
cache->flags |= MP_STREAM_SEEK;
cache->mode = STREAM_READ;
cache->read_chunk = orig->read_chunk;
cache->url = strdup(orig->url);
cache->mime_type = talloc_strdup(cache, orig->mime_type);
cache->lavf_type = orig->lavf_type;
cache->opts = orig->opts;
cache->sector_size = orig->sector_size;
cache->read_chunk = orig->read_chunk;
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;
}
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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