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FFmpeg/libavformat/aviobuf.c
Martin Storsjö 3fcfde2cea aviobuf: Increase the default SHORT_SEEK_THRESHOLD to 32 KB 
The previous threshold, 4 KB, maybe was reasonable when it was set
(in 2010), but in today's settings and with typical network speeds
and data sizes, it's pretty small. 32 KB probably is a more reasonable
default now, regardless of input.

This changes the test references for two seek tests.

When using the normal seek function, which boils down to the lseek(2)
function, a seek to an out of bounds position doesn't return an error,
but that condition is only reported when doing the subsequent read
(which returns EOF). When doing more seeks by fast forwarding, the
fact that the seeked to destination is out of bounds is noticed and
reported sooner in these cases.

Signed-off-by: Martin Storsjö <martin@martin.st>
2020-11-12 14:05:43 +02:00

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/*
* buffered I/O
* Copyright (c) 2000,2001 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/bprint.h"
#include "libavutil/crc.h"
#include "libavutil/dict.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/avassert.h"
#include "avformat.h"
#include "avio.h"
#include "avio_internal.h"
#include "internal.h"
#include "url.h"
#include <stdarg.h>
#define IO_BUFFER_SIZE 32768
/**
* Do seeks within this distance ahead of the current buffer by skipping
* data instead of calling the protocol seek function, for seekable
* protocols.
*/
#define SHORT_SEEK_THRESHOLD 32768
static void *ff_avio_child_next(void *obj, void *prev)
{
AVIOContext *s = obj;
return prev ? NULL : s->opaque;
}
#if FF_API_CHILD_CLASS_NEXT
static const AVClass *ff_avio_child_class_next(const AVClass *prev)
{
return prev ? NULL : &ffurl_context_class;
}
#endif
static const AVClass *child_class_iterate(void **iter)
{
const AVClass *c = *iter ? NULL : &ffurl_context_class;
*iter = (void*)(uintptr_t)c;
return c;
}
#define OFFSET(x) offsetof(AVIOContext,x)
#define E AV_OPT_FLAG_ENCODING_PARAM
#define D AV_OPT_FLAG_DECODING_PARAM
static const AVOption ff_avio_options[] = {
{"protocol_whitelist", "List of protocols that are allowed to be used", OFFSET(protocol_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },
{ NULL },
};
const AVClass ff_avio_class = {
.class_name = "AVIOContext",
.item_name = av_default_item_name,
.version = LIBAVUTIL_VERSION_INT,
.option = ff_avio_options,
.child_next = ff_avio_child_next,
#if FF_API_CHILD_CLASS_NEXT
.child_class_next = ff_avio_child_class_next,
#endif
.child_class_iterate = child_class_iterate,
};
static void fill_buffer(AVIOContext *s);
static int url_resetbuf(AVIOContext *s, int flags);
int ffio_init_context(AVIOContext *s,
unsigned char *buffer,
int buffer_size,
int write_flag,
void *opaque,
int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
int64_t (*seek)(void *opaque, int64_t offset, int whence))
{
memset(s, 0, sizeof(AVIOContext));
s->buffer = buffer;
s->orig_buffer_size =
s->buffer_size = buffer_size;
s->buf_ptr = buffer;
s->buf_ptr_max = buffer;
s->opaque = opaque;
s->direct = 0;
url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
s->write_packet = write_packet;
s->read_packet = read_packet;
s->seek = seek;
s->pos = 0;
s->eof_reached = 0;
s->error = 0;
s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0;
s->min_packet_size = 0;
s->max_packet_size = 0;
s->update_checksum = NULL;
s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
if (!read_packet && !write_flag) {
s->pos = buffer_size;
s->buf_end = s->buffer + buffer_size;
}
s->read_pause = NULL;
s->read_seek = NULL;
s->write_data_type = NULL;
s->ignore_boundary_point = 0;
s->current_type = AVIO_DATA_MARKER_UNKNOWN;
s->last_time = AV_NOPTS_VALUE;
s->short_seek_get = NULL;
s->written = 0;
return 0;
}
AVIOContext *avio_alloc_context(
unsigned char *buffer,
int buffer_size,
int write_flag,
void *opaque,
int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
int64_t (*seek)(void *opaque, int64_t offset, int whence))
{
AVIOContext *s = av_malloc(sizeof(AVIOContext));
if (!s)
return NULL;
ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
read_packet, write_packet, seek);
return s;
}
void avio_context_free(AVIOContext **ps)
{
av_freep(ps);
}
static void writeout(AVIOContext *s, const uint8_t *data, int len)
{
if (!s->error) {
int ret = 0;
if (s->write_data_type)
ret = s->write_data_type(s->opaque, (uint8_t *)data,
len,
s->current_type,
s->last_time);
else if (s->write_packet)
ret = s->write_packet(s->opaque, (uint8_t *)data, len);
if (ret < 0) {
s->error = ret;
} else {
if (s->pos + len > s->written)
s->written = s->pos + len;
}
}
if (s->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
s->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
s->current_type = AVIO_DATA_MARKER_UNKNOWN;
}
s->last_time = AV_NOPTS_VALUE;
s->writeout_count ++;
s->pos += len;
}
static void flush_buffer(AVIOContext *s)
{
s->buf_ptr_max = FFMAX(s->buf_ptr, s->buf_ptr_max);
if (s->write_flag && s->buf_ptr_max > s->buffer) {
writeout(s, s->buffer, s->buf_ptr_max - s->buffer);
if (s->update_checksum) {
s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
s->buf_ptr_max - s->checksum_ptr);
s->checksum_ptr = s->buffer;
}
}
s->buf_ptr = s->buf_ptr_max = s->buffer;
if (!s->write_flag)
s->buf_end = s->buffer;
}
void avio_w8(AVIOContext *s, int b)
{
av_assert2(b>=-128 && b<=255);
*s->buf_ptr++ = b;
if (s->buf_ptr >= s->buf_end)
flush_buffer(s);
}
void ffio_fill(AVIOContext *s, int b, int count)
{
while (count > 0) {
int len = FFMIN(s->buf_end - s->buf_ptr, count);
memset(s->buf_ptr, b, len);
s->buf_ptr += len;
if (s->buf_ptr >= s->buf_end)
flush_buffer(s);
count -= len;
}
}
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
{
if (s->direct && !s->update_checksum) {
avio_flush(s);
writeout(s, buf, size);
return;
}
while (size > 0) {
int len = FFMIN(s->buf_end - s->buf_ptr, size);
memcpy(s->buf_ptr, buf, len);
s->buf_ptr += len;
if (s->buf_ptr >= s->buf_end)
flush_buffer(s);
buf += len;
size -= len;
}
}
void avio_flush(AVIOContext *s)
{
int seekback = s->write_flag ? FFMIN(0, s->buf_ptr - s->buf_ptr_max) : 0;
flush_buffer(s);
if (seekback)
avio_seek(s, seekback, SEEK_CUR);
}
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
{
int64_t offset1;
int64_t pos;
int force = whence & AVSEEK_FORCE;
int buffer_size;
int short_seek;
whence &= ~AVSEEK_FORCE;
if(!s)
return AVERROR(EINVAL);
if ((whence & AVSEEK_SIZE))
return s->seek ? s->seek(s->opaque, offset, AVSEEK_SIZE) : AVERROR(ENOSYS);
buffer_size = s->buf_end - s->buffer;
// pos is the absolute position that the beginning of s->buffer corresponds to in the file
pos = s->pos - (s->write_flag ? 0 : buffer_size);
if (whence != SEEK_CUR && whence != SEEK_SET)
return AVERROR(EINVAL);
if (whence == SEEK_CUR) {
offset1 = pos + (s->buf_ptr - s->buffer);
if (offset == 0)
return offset1;
if (offset > INT64_MAX - offset1)
return AVERROR(EINVAL);
offset += offset1;
}
if (offset < 0)
return AVERROR(EINVAL);
if (s->short_seek_get) {
short_seek = s->short_seek_get(s->opaque);
/* fallback to default short seek */
if (short_seek <= 0)
short_seek = s->short_seek_threshold;
} else
short_seek = s->short_seek_threshold;
offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
s->buf_ptr_max = FFMAX(s->buf_ptr_max, s->buf_ptr);
if ((!s->direct || !s->seek) &&
offset1 >= 0 && offset1 <= (s->write_flag ? s->buf_ptr_max - s->buffer : buffer_size)) {
/* can do the seek inside the buffer */
s->buf_ptr = s->buffer + offset1;
} else if ((!(s->seekable & AVIO_SEEKABLE_NORMAL) ||
offset1 <= buffer_size + short_seek) &&
!s->write_flag && offset1 >= 0 &&
(!s->direct || !s->seek) &&
(whence != SEEK_END || force)) {
while(s->pos < offset && !s->eof_reached)
fill_buffer(s);
if (s->eof_reached)
return AVERROR_EOF;
s->buf_ptr = s->buf_end - (s->pos - offset);
} else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
int64_t res;
pos -= FFMIN(buffer_size>>1, pos);
if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
return res;
s->buf_end =
s->buf_ptr = s->buffer;
s->pos = pos;
s->eof_reached = 0;
fill_buffer(s);
return avio_seek(s, offset, SEEK_SET | force);
} else {
int64_t res;
if (s->write_flag) {
flush_buffer(s);
}
if (!s->seek)
return AVERROR(EPIPE);
if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
return res;
s->seek_count ++;
if (!s->write_flag)
s->buf_end = s->buffer;
s->buf_ptr = s->buf_ptr_max = s->buffer;
s->pos = offset;
}
s->eof_reached = 0;
return offset;
}
int64_t avio_skip(AVIOContext *s, int64_t offset)
{
return avio_seek(s, offset, SEEK_CUR);
}
int64_t avio_size(AVIOContext *s)
{
int64_t size;
if (!s)
return AVERROR(EINVAL);
if (s->written)
return s->written;
if (!s->seek)
return AVERROR(ENOSYS);
size = s->seek(s->opaque, 0, AVSEEK_SIZE);
if (size < 0) {
if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
return size;
size++;
s->seek(s->opaque, s->pos, SEEK_SET);
}
return size;
}
int avio_feof(AVIOContext *s)
{
if(!s)
return 0;
if(s->eof_reached){
s->eof_reached=0;
fill_buffer(s);
}
return s->eof_reached;
}
void avio_wl32(AVIOContext *s, unsigned int val)
{
avio_w8(s, (uint8_t) val );
avio_w8(s, (uint8_t)(val >> 8 ));
avio_w8(s, (uint8_t)(val >> 16));
avio_w8(s, val >> 24 );
}
void avio_wb32(AVIOContext *s, unsigned int val)
{
avio_w8(s, val >> 24 );
avio_w8(s, (uint8_t)(val >> 16));
avio_w8(s, (uint8_t)(val >> 8 ));
avio_w8(s, (uint8_t) val );
}
int avio_put_str(AVIOContext *s, const char *str)
{
int len = 1;
if (str) {
len += strlen(str);
avio_write(s, (const unsigned char *) str, len);
} else
avio_w8(s, 0);
return len;
}
static inline int put_str16(AVIOContext *s, const char *str, const int be)
{
const uint8_t *q = str;
int ret = 0;
int err = 0;
while (*q) {
uint32_t ch;
uint16_t tmp;
GET_UTF8(ch, *q++, goto invalid;)
PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
ret += 2;)
continue;
invalid:
av_log(s, AV_LOG_ERROR, "Invalid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
err = AVERROR(EINVAL);
if (!*(q-1))
break;
}
if (be)
avio_wb16(s, 0);
else
avio_wl16(s, 0);
if (err)
return err;
ret += 2;
return ret;
}
#define PUT_STR16(type, big_endian) \
int avio_put_str16 ## type(AVIOContext *s, const char *str) \
{ \
return put_str16(s, str, big_endian); \
}
PUT_STR16(le, 0)
PUT_STR16(be, 1)
#undef PUT_STR16
void avio_wl64(AVIOContext *s, uint64_t val)
{
avio_wl32(s, (uint32_t)(val & 0xffffffff));
avio_wl32(s, (uint32_t)(val >> 32));
}
void avio_wb64(AVIOContext *s, uint64_t val)
{
avio_wb32(s, (uint32_t)(val >> 32));
avio_wb32(s, (uint32_t)(val & 0xffffffff));
}
void avio_wl16(AVIOContext *s, unsigned int val)
{
avio_w8(s, (uint8_t)val);
avio_w8(s, (int)val >> 8);
}
void avio_wb16(AVIOContext *s, unsigned int val)
{
avio_w8(s, (int)val >> 8);
avio_w8(s, (uint8_t)val);
}
void avio_wl24(AVIOContext *s, unsigned int val)
{
avio_wl16(s, val & 0xffff);
avio_w8(s, (int)val >> 16);
}
void avio_wb24(AVIOContext *s, unsigned int val)
{
avio_wb16(s, (int)val >> 8);
avio_w8(s, (uint8_t)val);
}
void avio_write_marker(AVIOContext *s, int64_t time, enum AVIODataMarkerType type)
{
if (type == AVIO_DATA_MARKER_FLUSH_POINT) {
if (s->buf_ptr - s->buffer >= s->min_packet_size)
avio_flush(s);
return;
}
if (!s->write_data_type)
return;
// If ignoring boundary points, just treat it as unknown
if (type == AVIO_DATA_MARKER_BOUNDARY_POINT && s->ignore_boundary_point)
type = AVIO_DATA_MARKER_UNKNOWN;
// Avoid unnecessary flushes if we are already in non-header/trailer
// data and setting the type to unknown
if (type == AVIO_DATA_MARKER_UNKNOWN &&
(s->current_type != AVIO_DATA_MARKER_HEADER &&
s->current_type != AVIO_DATA_MARKER_TRAILER))
return;
switch (type) {
case AVIO_DATA_MARKER_HEADER:
case AVIO_DATA_MARKER_TRAILER:
// For header/trailer, ignore a new marker of the same type;
// consecutive header/trailer markers can be merged.
if (type == s->current_type)
return;
break;
}
// If we've reached here, we have a new, noteworthy marker.
// Flush the previous data and mark the start of the new data.
avio_flush(s);
s->current_type = type;
s->last_time = time;
}
static int read_packet_wrapper(AVIOContext *s, uint8_t *buf, int size)
{
int ret;
if (!s->read_packet)
return AVERROR(EINVAL);
ret = s->read_packet(s->opaque, buf, size);
#if FF_API_OLD_AVIO_EOF_0
if (!ret && !s->max_packet_size) {
av_log(NULL, AV_LOG_WARNING, "Invalid return value 0 for stream protocol\n");
ret = AVERROR_EOF;
}
#else
av_assert2(ret || s->max_packet_size);
#endif
return ret;
}
/* Input stream */
static void fill_buffer(AVIOContext *s)
{
int max_buffer_size = s->max_packet_size ?
s->max_packet_size : IO_BUFFER_SIZE;
uint8_t *dst = s->buf_end - s->buffer + max_buffer_size <= s->buffer_size ?
s->buf_end : s->buffer;
int len = s->buffer_size - (dst - s->buffer);
/* can't fill the buffer without read_packet, just set EOF if appropriate */
if (!s->read_packet && s->buf_ptr >= s->buf_end)
s->eof_reached = 1;
/* no need to do anything if EOF already reached */
if (s->eof_reached)
return;
if (s->update_checksum && dst == s->buffer) {
if (s->buf_end > s->checksum_ptr)
s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
s->buf_end - s->checksum_ptr);
s->checksum_ptr = s->buffer;
}
/* make buffer smaller in case it ended up large after probing */
if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size && len >= s->orig_buffer_size) {
if (dst == s->buffer && s->buf_ptr != dst) {
int ret = ffio_set_buf_size(s, s->orig_buffer_size);
if (ret < 0)
av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
s->checksum_ptr = dst = s->buffer;
}
len = s->orig_buffer_size;
}
len = read_packet_wrapper(s, dst, len);
if (len == AVERROR_EOF) {
/* do not modify buffer if EOF reached so that a seek back can
be done without rereading data */
s->eof_reached = 1;
} else if (len < 0) {
s->eof_reached = 1;
s->error= len;
} else {
s->pos += len;
s->buf_ptr = dst;
s->buf_end = dst + len;
s->bytes_read += len;
}
}
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
unsigned int len)
{
return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
}
unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
unsigned int len)
{
return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
}
unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
unsigned int len)
{
return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
}
unsigned long ffio_get_checksum(AVIOContext *s)
{
s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
s->buf_ptr - s->checksum_ptr);
s->update_checksum = NULL;
return s->checksum;
}
void ffio_init_checksum(AVIOContext *s,
unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
unsigned long checksum)
{
s->update_checksum = update_checksum;
if (s->update_checksum) {
s->checksum = checksum;
s->checksum_ptr = s->buf_ptr;
}
}
/* XXX: put an inline version */
int avio_r8(AVIOContext *s)
{
if (s->buf_ptr >= s->buf_end)
fill_buffer(s);
if (s->buf_ptr < s->buf_end)
return *s->buf_ptr++;
return 0;
}
int avio_read(AVIOContext *s, unsigned char *buf, int size)
{
int len, size1;
size1 = size;
while (size > 0) {
len = FFMIN(s->buf_end - s->buf_ptr, size);
if (len == 0 || s->write_flag) {
if((s->direct || size > s->buffer_size) && !s->update_checksum) {
// bypass the buffer and read data directly into buf
len = read_packet_wrapper(s, buf, size);
if (len == AVERROR_EOF) {
/* do not modify buffer if EOF reached so that a seek back can
be done without rereading data */
s->eof_reached = 1;
break;
} else if (len < 0) {
s->eof_reached = 1;
s->error= len;
break;
} else {
s->pos += len;
s->bytes_read += len;
size -= len;
buf += len;
// reset the buffer
s->buf_ptr = s->buffer;
s->buf_end = s->buffer/* + len*/;
}
} else {
fill_buffer(s);
len = s->buf_end - s->buf_ptr;
if (len == 0)
break;
}
} else {
memcpy(buf, s->buf_ptr, len);
buf += len;
s->buf_ptr += len;
size -= len;
}
}
if (size1 == size) {
if (s->error) return s->error;
if (avio_feof(s)) return AVERROR_EOF;
}
return size1 - size;
}
int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
{
int ret = avio_read(s, buf, size);
if (ret == size)
return ret;
if (ret < 0 && ret != AVERROR_EOF)
return ret;
return AVERROR_INVALIDDATA;
}
int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
{
if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
*data = s->buf_ptr;
s->buf_ptr += size;
return size;
} else {
*data = buf;
return avio_read(s, buf, size);
}
}
int avio_read_partial(AVIOContext *s, unsigned char *buf, int size)
{
int len;
if (size < 0)
return AVERROR(EINVAL);
if (s->read_packet && s->write_flag) {
len = read_packet_wrapper(s, buf, size);
if (len > 0)
s->pos += len;
return len;
}
len = s->buf_end - s->buf_ptr;
if (len == 0) {
fill_buffer(s);
len = s->buf_end - s->buf_ptr;
}
if (len > size)
len = size;
memcpy(buf, s->buf_ptr, len);
s->buf_ptr += len;
if (!len) {
if (s->error) return s->error;
if (avio_feof(s)) return AVERROR_EOF;
}
return len;
}
unsigned int avio_rl16(AVIOContext *s)
{
unsigned int val;
val = avio_r8(s);
val |= avio_r8(s) << 8;
return val;
}
unsigned int avio_rl24(AVIOContext *s)
{
unsigned int val;
val = avio_rl16(s);
val |= avio_r8(s) << 16;
return val;
}
unsigned int avio_rl32(AVIOContext *s)
{
unsigned int val;
val = avio_rl16(s);
val |= avio_rl16(s) << 16;
return val;
}
uint64_t avio_rl64(AVIOContext *s)
{
uint64_t val;
val = (uint64_t)avio_rl32(s);
val |= (uint64_t)avio_rl32(s) << 32;
return val;
}
unsigned int avio_rb16(AVIOContext *s)
{
unsigned int val;
val = avio_r8(s) << 8;
val |= avio_r8(s);
return val;
}
unsigned int avio_rb24(AVIOContext *s)
{
unsigned int val;
val = avio_rb16(s) << 8;
val |= avio_r8(s);
return val;
}
unsigned int avio_rb32(AVIOContext *s)
{
unsigned int val;
val = avio_rb16(s) << 16;
val |= avio_rb16(s);
return val;
}
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
{
int i = 0;
char c;
do {
c = avio_r8(s);
if (c && i < maxlen-1)
buf[i++] = c;
} while (c != '\n' && c != '\r' && c);
if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
avio_skip(s, -1);
buf[i] = 0;
return i;
}
int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen)
{
int len = ff_get_line(s, buf, maxlen);
while (len > 0 && av_isspace(buf[len - 1]))
buf[--len] = '\0';
return len;
}
int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp)
{
int len, end;
int64_t read = 0;
char tmp[1024];
char c;
do {
len = 0;
do {
c = avio_r8(s);
end = (c == '\r' || c == '\n' || c == '\0');
if (!end)
tmp[len++] = c;
} while (!end && len < sizeof(tmp));
av_bprint_append_data(bp, tmp, len);
read += len;
} while (!end);
if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
avio_skip(s, -1);
if (!c && s->error)
return s->error;
if (!c && !read && avio_feof(s))
return AVERROR_EOF;
return read;
}
int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp)
{
int64_t ret;
av_bprint_clear(bp);
ret = ff_read_line_to_bprint(s, bp);
if (ret < 0)
return ret;
if (!av_bprint_is_complete(bp))
return AVERROR(ENOMEM);
return bp->len;
}
int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
{
int i;
if (buflen <= 0)
return AVERROR(EINVAL);
// reserve 1 byte for terminating 0
buflen = FFMIN(buflen - 1, maxlen);
for (i = 0; i < buflen; i++)
if (!(buf[i] = avio_r8(s)))
return i + 1;
buf[i] = 0;
for (; i < maxlen; i++)
if (!avio_r8(s))
return i + 1;
return maxlen;
}
#define GET_STR16(type, read) \
int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
{\
char* q = buf;\
int ret = 0;\
if (buflen <= 0) \
return AVERROR(EINVAL); \
while (ret + 1 < maxlen) {\
uint8_t tmp;\
uint32_t ch;\
GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
if (!ch)\
break;\
PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
}\
*q = 0;\
return ret;\
}\
GET_STR16(le, avio_rl16)
GET_STR16(be, avio_rb16)
#undef GET_STR16
uint64_t avio_rb64(AVIOContext *s)
{
uint64_t val;
val = (uint64_t)avio_rb32(s) << 32;
val |= (uint64_t)avio_rb32(s);
return val;
}
uint64_t ffio_read_varlen(AVIOContext *bc){
uint64_t val = 0;
int tmp;
do{
tmp = avio_r8(bc);
val= (val<<7) + (tmp&127);
}while(tmp&128);
return val;
}
int ffio_fdopen(AVIOContext **s, URLContext *h)
{
uint8_t *buffer = NULL;
int buffer_size, max_packet_size;
max_packet_size = h->max_packet_size;
if (max_packet_size) {
buffer_size = max_packet_size; /* no need to bufferize more than one packet */
} else {
buffer_size = IO_BUFFER_SIZE;
}
if (!(h->flags & AVIO_FLAG_WRITE) && h->is_streamed) {
if (buffer_size > INT_MAX/2)
return AVERROR(EINVAL);
buffer_size *= 2;
}
buffer = av_malloc(buffer_size);
if (!buffer)
return AVERROR(ENOMEM);
*s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h,
(int (*)(void *, uint8_t *, int)) ffurl_read,
(int (*)(void *, uint8_t *, int)) ffurl_write,
(int64_t (*)(void *, int64_t, int))ffurl_seek);
if (!*s)
goto fail;
(*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
avio_closep(s);
goto fail;
}
(*s)->protocol_blacklist = av_strdup(h->protocol_blacklist);
if (!(*s)->protocol_blacklist && h->protocol_blacklist) {
avio_closep(s);
goto fail;
}
(*s)->direct = h->flags & AVIO_FLAG_DIRECT;
(*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
(*s)->max_packet_size = max_packet_size;
(*s)->min_packet_size = h->min_packet_size;
if(h->prot) {
(*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
(*s)->read_seek =
(int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
if (h->prot->url_read_seek)
(*s)->seekable |= AVIO_SEEKABLE_TIME;
}
(*s)->short_seek_get = (int (*)(void *))ffurl_get_short_seek;
(*s)->av_class = &ff_avio_class;
return 0;
fail:
av_freep(&buffer);
return AVERROR(ENOMEM);
}
URLContext* ffio_geturlcontext(AVIOContext *s)
{
if (!s)
return NULL;
if (s->opaque && s->read_packet == (int (*)(void *, uint8_t *, int))ffurl_read)
return s->opaque;
else
return NULL;
}
static void update_checksum(AVIOContext *s)
{
if (s->update_checksum && s->buf_ptr > s->checksum_ptr) {
s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
s->buf_ptr - s->checksum_ptr);
}
}
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
{
uint8_t *buffer;
int max_buffer_size = s->max_packet_size ?
s->max_packet_size : IO_BUFFER_SIZE;
ptrdiff_t filled = s->buf_end - s->buf_ptr;
if (buf_size <= s->buf_end - s->buf_ptr)
return 0;
buf_size += max_buffer_size - 1;
if (buf_size + s->buf_ptr - s->buffer <= s->buffer_size || s->seekable || !s->read_packet)
return 0;
av_assert0(!s->write_flag);
if (buf_size <= s->buffer_size) {
update_checksum(s);
memmove(s->buffer, s->buf_ptr, filled);
} else {
buffer = av_malloc(buf_size);
if (!buffer)
return AVERROR(ENOMEM);
update_checksum(s);
memcpy(buffer, s->buf_ptr, filled);
av_free(s->buffer);
s->buffer = buffer;
s->buffer_size = buf_size;
}
s->buf_ptr = s->buffer;
s->buf_end = s->buffer + filled;
s->checksum_ptr = s->buffer;
return 0;
}
int ffio_set_buf_size(AVIOContext *s, int buf_size)
{
uint8_t *buffer;
buffer = av_malloc(buf_size);
if (!buffer)
return AVERROR(ENOMEM);
av_free(s->buffer);
s->buffer = buffer;
s->orig_buffer_size =
s->buffer_size = buf_size;
s->buf_ptr = s->buf_ptr_max = buffer;
url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
return 0;
}
int ffio_realloc_buf(AVIOContext *s, int buf_size)
{
uint8_t *buffer;
int data_size;
if (!s->buffer_size)
return ffio_set_buf_size(s, buf_size);
if (buf_size <= s->buffer_size)
return 0;
buffer = av_malloc(buf_size);
if (!buffer)
return AVERROR(ENOMEM);
data_size = s->write_flag ? (s->buf_ptr - s->buffer) : (s->buf_end - s->buf_ptr);
if (data_size > 0)
memcpy(buffer, s->write_flag ? s->buffer : s->buf_ptr, data_size);
av_free(s->buffer);
s->buffer = buffer;
s->orig_buffer_size = buf_size;
s->buffer_size = buf_size;
s->buf_ptr = s->write_flag ? (s->buffer + data_size) : s->buffer;
if (s->write_flag)
s->buf_ptr_max = s->buffer + data_size;
s->buf_end = s->write_flag ? (s->buffer + s->buffer_size) : (s->buf_ptr + data_size);
return 0;
}
static int url_resetbuf(AVIOContext *s, int flags)
{
av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
if (flags & AVIO_FLAG_WRITE) {
s->buf_end = s->buffer + s->buffer_size;
s->write_flag = 1;
} else {
s->buf_end = s->buffer;
s->write_flag = 0;
}
return 0;
}
int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
{
int64_t buffer_start;
int buffer_size;
int overlap, new_size, alloc_size;
uint8_t *buf = *bufp;
if (s->write_flag) {
av_freep(bufp);
return AVERROR(EINVAL);
}
buffer_size = s->buf_end - s->buffer;
/* the buffers must touch or overlap */
if ((buffer_start = s->pos - buffer_size) > buf_size) {
av_freep(bufp);
return AVERROR(EINVAL);
}
overlap = buf_size - buffer_start;
new_size = buf_size + buffer_size - overlap;
alloc_size = FFMAX(s->buffer_size, new_size);
if (alloc_size > buf_size)
if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
return AVERROR(ENOMEM);
if (new_size > buf_size) {
memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
buf_size = new_size;
}
av_free(s->buffer);
s->buf_ptr = s->buffer = buf;
s->buffer_size = alloc_size;
s->pos = buf_size;
s->buf_end = s->buf_ptr + buf_size;
s->eof_reached = 0;
return 0;
}
int avio_open(AVIOContext **s, const char *filename, int flags)
{
return avio_open2(s, filename, flags, NULL, NULL);
}
int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
const AVIOInterruptCB *int_cb, AVDictionary **options,
const char *whitelist, const char *blacklist
)
{
URLContext *h;
int err;
*s = NULL;
err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist, NULL);
if (err < 0)
return err;
err = ffio_fdopen(s, h);
if (err < 0) {
ffurl_close(h);
return err;
}
return 0;
}
int avio_open2(AVIOContext **s, const char *filename, int flags,
const AVIOInterruptCB *int_cb, AVDictionary **options)
{
return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL);
}
int avio_close(AVIOContext *s)
{
URLContext *h;
if (!s)
return 0;
avio_flush(s);
h = s->opaque;
s->opaque = NULL;
av_freep(&s->buffer);
if (s->write_flag)
av_log(s, AV_LOG_VERBOSE, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
else
av_log(s, AV_LOG_VERBOSE, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
av_opt_free(s);
avio_context_free(&s);
return ffurl_close(h);
}
int avio_closep(AVIOContext **s)
{
int ret = avio_close(*s);
*s = NULL;
return ret;
}
int avio_printf(AVIOContext *s, const char *fmt, ...)
{
va_list ap;
AVBPrint bp;
av_bprint_init(&bp, 0, INT_MAX);
va_start(ap, fmt);
av_vbprintf(&bp, fmt, ap);
va_end(ap);
if (!av_bprint_is_complete(&bp)) {
av_bprint_finalize(&bp, NULL);
s->error = AVERROR(ENOMEM);
return AVERROR(ENOMEM);
}
avio_write(s, bp.str, bp.len);
av_bprint_finalize(&bp, NULL);
return bp.len;
}
void avio_print_string_array(AVIOContext *s, const char *strings[])
{
for(; *strings; strings++)
avio_write(s, (const unsigned char *)*strings, strlen(*strings));
}
int avio_pause(AVIOContext *s, int pause)
{
if (!s->read_pause)
return AVERROR(ENOSYS);
return s->read_pause(s->opaque, pause);
}
int64_t avio_seek_time(AVIOContext *s, int stream_index,
int64_t timestamp, int flags)
{
int64_t ret;
if (!s->read_seek)
return AVERROR(ENOSYS);
ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
if (ret >= 0) {
int64_t pos;
s->buf_ptr = s->buf_end; // Flush buffer
pos = s->seek(s->opaque, 0, SEEK_CUR);
if (pos >= 0)
s->pos = pos;
else if (pos != AVERROR(ENOSYS))
ret = pos;
}
return ret;
}
int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
{
int ret;
char buf[1024];
while (max_size) {
ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
if (ret == AVERROR_EOF)
return 0;
if (ret <= 0)
return ret;
av_bprint_append_data(pb, buf, ret);
if (!av_bprint_is_complete(pb))
return AVERROR(ENOMEM);
max_size -= ret;
}
return 0;
}
int avio_accept(AVIOContext *s, AVIOContext **c)
{
int ret;
URLContext *sc = s->opaque;
URLContext *cc = NULL;
ret = ffurl_accept(sc, &cc);
if (ret < 0)
return ret;
return ffio_fdopen(c, cc);
}
int avio_handshake(AVIOContext *c)
{
URLContext *cc = c->opaque;
return ffurl_handshake(cc);
}
/* output in a dynamic buffer */
typedef struct DynBuffer {
int pos, size, allocated_size;
uint8_t *buffer;
int io_buffer_size;
uint8_t io_buffer[1];
} DynBuffer;
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
{
DynBuffer *d = opaque;
unsigned new_size;
/* reallocate buffer if needed */
new_size = (unsigned)d->pos + buf_size;
if (new_size < d->pos || new_size > INT_MAX)
return AVERROR(ERANGE);
if (new_size > d->allocated_size) {
unsigned new_allocated_size = d->allocated_size ? d->allocated_size
: new_size;
int err;
while (new_size > new_allocated_size)
new_allocated_size += new_allocated_size / 2 + 1;
new_allocated_size = FFMIN(new_allocated_size, INT_MAX);
if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
d->allocated_size = 0;
d->size = 0;
return err;
}
d->allocated_size = new_allocated_size;
}
memcpy(d->buffer + d->pos, buf, buf_size);
d->pos = new_size;
if (d->pos > d->size)
d->size = d->pos;
return buf_size;
}
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
{
unsigned char buf1[4];
int ret;
/* packetized write: output the header */
AV_WB32(buf1, buf_size);
ret = dyn_buf_write(opaque, buf1, 4);
if (ret < 0)
return ret;
/* then the data */
return dyn_buf_write(opaque, buf, buf_size);
}
static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
{
DynBuffer *d = opaque;
if (whence == SEEK_CUR)
offset += d->pos;
else if (whence == SEEK_END)
offset += d->size;
if (offset < 0)
return AVERROR(EINVAL);
if (offset > INT_MAX)
return AVERROR(ERANGE);
d->pos = offset;
return 0;
}
static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
{
DynBuffer *d;
unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
return AVERROR(ERANGE);
d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
if (!d)
return AVERROR(ENOMEM);
d->io_buffer_size = io_buffer_size;
*s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
max_packet_size ? NULL : dyn_buf_seek);
if(!*s) {
av_free(d);
return AVERROR(ENOMEM);
}
(*s)->max_packet_size = max_packet_size;
return 0;
}
int avio_open_dyn_buf(AVIOContext **s)
{
return url_open_dyn_buf_internal(s, 0);
}
int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
{
if (max_packet_size <= 0)
return AVERROR(EINVAL);
return url_open_dyn_buf_internal(s, max_packet_size);
}
int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
{
DynBuffer *d;
if (!s) {
*pbuffer = NULL;
return 0;
}
d = s->opaque;
if (!s->error && !d->size) {
*pbuffer = d->io_buffer;
return FFMAX(s->buf_ptr, s->buf_ptr_max) - s->buffer;
}
avio_flush(s);
*pbuffer = d->buffer;
return d->size;
}
void ffio_reset_dyn_buf(AVIOContext *s)
{
DynBuffer *d = s->opaque;
int max_packet_size = s->max_packet_size;
ffio_init_context(s, d->io_buffer, d->io_buffer_size, 1, d, NULL,
s->write_packet, s->seek);
s->max_packet_size = max_packet_size;
d->pos = d->size = 0;
}
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
{
DynBuffer *d;
int size;
static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
int padding = 0;
if (!s) {
*pbuffer = NULL;
return 0;
}
/* don't attempt to pad fixed-size packet buffers */
if (!s->max_packet_size) {
avio_write(s, padbuf, sizeof(padbuf));
padding = AV_INPUT_BUFFER_PADDING_SIZE;
}
avio_flush(s);
d = s->opaque;
*pbuffer = d->buffer;
size = d->size;
av_free(d);
avio_context_free(&s);
return size - padding;
}
void ffio_free_dyn_buf(AVIOContext **s)
{
DynBuffer *d;
if (!*s)
return;
d = (*s)->opaque;
av_free(d->buffer);
av_free(d);
avio_context_free(s);
}
static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
{
DynBuffer *d = opaque;
d->pos += buf_size;
if (d->pos > d->size)
d->size = d->pos;
return buf_size;
}
int ffio_open_null_buf(AVIOContext **s)
{
int ret = url_open_dyn_buf_internal(s, 0);
if (ret >= 0) {
AVIOContext *pb = *s;
pb->write_packet = null_buf_write;
}
return ret;
}
int ffio_close_null_buf(AVIOContext *s)
{
DynBuffer *d = s->opaque;
int size;
avio_flush(s);
size = d->size;
av_free(d);
avio_context_free(&s);
return size;
}
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