RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2024-12-30 19:32:13 +00:00
Code Issues Projects Releases Wiki Activity
eb9c96a82f
ffmpeg/libavformat/aviobuf.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

1480 lines
38 KiB
C
Raw Blame History

/*
* 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/mem.h"
#include "libavutil/opt.h"
#include "libavutil/avassert.h"
#include "libavcodec/defs.h"
#include "avio.h"
#include "avio_internal.h"
#include "internal.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 fill_buffer(AVIOContext *s);
static int url_resetbuf(AVIOContext *s, int flags);
/** @warning must be called before any I/O */
static int set_buf_size(AVIOContext *s, int buf_size);
void ffio_init_context(FFIOContext *ctx,
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, const uint8_t *buf, int buf_size),
int64_t (*seek)(void *opaque, int64_t offset, int whence))
{
AVIOContext *const s = &ctx->pub;
memset(ctx, 0, sizeof(*ctx));
s->buffer = buffer;
ctx->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;
ctx->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;
ctx->current_type = AVIO_DATA_MARKER_UNKNOWN;
ctx->last_time = AV_NOPTS_VALUE;
ctx->short_seek_get = NULL;
}
void ffio_init_read_context(FFIOContext *s, const uint8_t *buffer, int buffer_size)
{
ffio_init_context(s, (unsigned char*)buffer, buffer_size, 0, NULL, NULL, NULL, NULL);
}
void ffio_init_write_context(FFIOContext *s, uint8_t *buffer, int buffer_size)
{
ffio_init_context(s, buffer, buffer_size, 1, NULL, NULL, NULL, NULL);
}
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, const uint8_t *buf, int buf_size),
int64_t (*seek)(void *opaque, int64_t offset, int whence))
{
FFIOContext *s = av_malloc(sizeof(*s));
if (!s)
return NULL;
ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
read_packet, write_packet, seek);
return &s->pub;
}
void avio_context_free(AVIOContext **ps)
{
av_freep(ps);
}
static void writeout(AVIOContext *s, const uint8_t *data, int len)
{
FFIOContext *const ctx = ffiocontext(s);
if (!s->error) {
int ret = 0;
if (s->write_data_type)
ret = s->write_data_type(s->opaque, data,
len,
ctx->current_type,
ctx->last_time);
else if (s->write_packet)
ret = s->write_packet(s->opaque, data, len);
if (ret < 0) {
s->error = ret;
} else {
ctx->bytes_written += len;
s->bytes_written = ctx->bytes_written;
if (s->pos + len > ctx->written_output_size) {
ctx->written_output_size = s->pos + len;
}
}
}
if (ctx->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
ctx->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
ctx->current_type = AVIO_DATA_MARKER_UNKNOWN;
}
ctx->last_time = AV_NOPTS_VALUE;
ctx->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, int64_t 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 (size <= 0)
return;
if (s->direct && !s->update_checksum) {
avio_flush(s);
writeout(s, buf, size);
return;
}
do {
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;
} while (size > 0);
}
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)
{
FFIOContext *const ctx = ffiocontext(s);
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);
short_seek = ctx->short_seek_threshold;
if (ctx->short_seek_get) {
int tmp = ctx->short_seek_get(s->opaque);
short_seek = FFMAX(tmp, short_seek);
}
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;
ctx->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)
{
FFIOContext *const ctx = ffiocontext(s);
int64_t size;
if (!s)
return AVERROR(EINVAL);
if (ctx->written_output_size)
return ctx->written_output_size;
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)
{
FFIOContext *const ctx = ffiocontext(s);
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 &&
(ctx->current_type != AVIO_DATA_MARKER_HEADER &&
ctx->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 == ctx->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);
ctx->current_type = type;
ctx->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);
av_assert2(ret || s->max_packet_size);
return ret;
}
/* Input stream */
static void fill_buffer(AVIOContext *s)
{
FFIOContext *const ctx = (FFIOContext *)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 && ctx->orig_buffer_size &&
s->buffer_size > ctx->orig_buffer_size && len >= ctx->orig_buffer_size) {
if (dst == s->buffer && s->buf_ptr != dst) {
int ret = set_buf_size(s, ctx->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 = ctx->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;
ffiocontext(s)->bytes_read += len;
s->bytes_read = ffiocontext(s)->bytes_read;
}
}
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 && s->read_packet) {
// 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;
ffiocontext(s)->bytes_read += len;
s->bytes_read = ffiocontext(s)->bytes_read;
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;
}
typedef enum FFBPrintReadStringMode {
FFBPrintReadString = 0,
FFBPrintReadLine = 1,
} FFBPrintReadStringMode;
static int64_t read_string_to_bprint(AVIOContext *s, AVBPrint *bp,
FFBPrintReadStringMode mode,
int64_t max_len)
{
int len, end;
int64_t read = 0;
char tmp[1024];
char c;
if (!max_len)
return 0;
do {
len = 0;
do {
c = avio_r8(s);
end = ((mode == FFBPrintReadLine && (c == '\r' || c == '\n')) ||
c == '\0');
if (!end)
tmp[len++] = c;
} while (!end && len < sizeof(tmp) &&
((max_len < 0) || (read + len < max_len)));
av_bprint_append_data(bp, tmp, len);
read += len;
} while (!end && ((max_len < 0) || (read < max_len)));
if (mode == FFBPrintReadLine &&
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;
}
static int64_t read_string_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp,
FFBPrintReadStringMode mode,
int64_t max_len)
{
int64_t ret;
av_bprint_clear(bp);
ret = read_string_to_bprint(s, bp, mode, max_len);
if (ret < 0)
return ret;
if (!av_bprint_is_complete(bp))
return AVERROR(ENOMEM);
return bp->len;
}
int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp)
{
return read_string_to_bprint_overwrite(s, bp, FFBPrintReadLine, -1);
}
int64_t ff_read_string_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp,
int64_t max_len)
{
return read_string_to_bprint_overwrite(s, bp, FFBPrintReadString, max_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;
}
unsigned int ffio_read_leb(AVIOContext *s) {
int more, i = 0;
unsigned leb = 0;
do {
int byte = avio_r8(s);
unsigned bits = byte & 0x7f;
more = byte & 0x80;
if (i <= 4)
leb |= bits << (i * 7);
if (++i == 8)
break;
} while (more);
return leb;
}
void ffio_write_leb(AVIOContext *s, unsigned val)
{
int len;
uint8_t byte;
len = (av_log2(val) + 7) / 7;
for (int i = 0; i < len; i++) {
byte = val >> (7 * i) & 0x7f;
if (i < len - 1)
byte |= 0x80;
avio_w8(s, byte);
}
}
void ffio_write_lines(AVIOContext *s, const unsigned char *buf, int size,
const unsigned char *ending)
{
int ending_len = ending ? strlen(ending) : 1;
if (!ending)
ending = "\n";
if (size < 0)
size = strlen(buf);
while (size > 0) {
size_t len = 0;
char last = 0;
for (; len < size; len++) {
last = buf[len];
if (last == '\r' || last == '\n')
break;
}
avio_write(s, buf, len);
avio_write(s, ending, ending_len);
buf += len + 1;
size -= len + 1;
if (size > 0 && last == '\r' && buf[0] == '\n') {
buf++;
size--;
}
}
}
int ffio_copy_url_options(AVIOContext* pb, AVDictionary** avio_opts)
{
const char *opts[] = {
"headers", "user_agent", "cookies", "http_proxy", "referer", "rw_timeout", "icy", NULL };
const char **opt = opts;
uint8_t *buf = NULL;
int ret = 0;
while (*opt) {
if (av_opt_get(pb, *opt, AV_OPT_SEARCH_CHILDREN, &buf) >= 0) {
if (buf[0] != '\0') {
ret = av_dict_set(avio_opts, *opt, buf, AV_DICT_DONT_STRDUP_VAL);
if (ret < 0)
return ret;
} else {
av_freep(&buf);
}
}
opt++;
}
return ret;
}
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;
if (buf_size > INT_MAX - max_buffer_size)
return AVERROR(EINVAL);
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_limit(AVIOContext *s, int size)
{
FFIOContext *const ctx = ffiocontext(s);
if (ctx->maxsize >= 0) {
int64_t pos = avio_tell(s);
int64_t remaining = ctx->maxsize - pos;
if (remaining < size) {
int64_t newsize = avio_size(s);
if (!ctx->maxsize || ctx->maxsize < newsize)
ctx->maxsize = newsize - !newsize;
if (pos > ctx->maxsize && ctx->maxsize >= 0)
ctx->maxsize = AVERROR(EIO);
if (ctx->maxsize >= 0)
remaining = ctx->maxsize - pos;
}
if (ctx->maxsize >= 0 && remaining < size && size > 1) {
av_log(NULL, remaining ? AV_LOG_ERROR : AV_LOG_DEBUG,
"Truncating packet of size %d to %"PRId64"\n",
size, remaining + !remaining);
size = remaining + !remaining;
}
}
return size;
}
static int 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;
ffiocontext(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 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;
ffiocontext(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_vprintf(AVIOContext *s, const char *fmt, va_list ap)
{
AVBPrint bp;
av_bprint_init(&bp, 0, INT_MAX);
av_vbprintf(&bp, fmt, 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;
}
int avio_printf(AVIOContext *s, const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = avio_vprintf(s, fmt, ap);
va_end(ap);
return ret;
}
void avio_print_string_array(AVIOContext *s, const char *const 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;
}
/* 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, const 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, const 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)
{
struct { FFIOContext pb; DynBuffer d; } *ret;
DynBuffer *d;
unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
if (sizeof(*ret) + io_buffer_size < io_buffer_size)
return AVERROR(ERANGE);
ret = av_mallocz(sizeof(*ret) + io_buffer_size);
if (!ret)
return AVERROR(ENOMEM);
d = &ret->d;
d->io_buffer_size = io_buffer_size;
ffio_init_context(&ret->pb, 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);
*s = &ret->pb.pub;
(*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(ffiocontext(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;
int padding = 0;
if (!s) {
*pbuffer = NULL;
return 0;
}
/* don't attempt to pad fixed-size packet buffers */
if (!s->max_packet_size) {
ffio_fill(s, 0, AV_INPUT_BUFFER_PADDING_SIZE);
padding = AV_INPUT_BUFFER_PADDING_SIZE;
}
avio_flush(s);
d = s->opaque;
*pbuffer = d->buffer;
size = d->size;
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);
avio_context_free(s);
}
static int null_buf_write(void *opaque, const 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;
avio_context_free(&s);
return size;
}
Reference in New Issue View Git Blame Copy Permalink