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FFmpeg/libavformat/aviobuf.c
softworkz 9488032e10 libavformat/avio: Add avio_get_dyn_buf function 
This commit adds the avio_get_dyn_buf function which allows accessing
the
content of a DynBuffer without destroying it.

This is required in matroskaenc for preliminary writing (correct) mkv
headers.

Context for this change is fixing regression bug #5977.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2017-01-07 13:04:05 +01:00

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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 4096
typedef struct AVIOInternal {
URLContext *h;
} AVIOInternal;
static void *ff_avio_child_next(void *obj, void *prev)
{
AVIOContext *s = obj;
AVIOInternal *internal = s->opaque;
return prev ? NULL : internal->h;
}
static const AVClass *ff_avio_child_class_next(const AVClass *prev)
{
return prev ? NULL : &ffurl_context_class;
}
#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 }, CHAR_MIN, CHAR_MAX, 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,
.child_class_next = ff_avio_child_class_next,
};
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))
{
s->buffer = buffer;
s->orig_buffer_size =
s->buffer_size = buffer_size;
s->buf_ptr = 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->must_flush = 0;
s->eof_reached = 0;
s->error = 0;
s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 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;
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_mallocz(sizeof(AVIOContext));
if (!s)
return NULL;
ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
read_packet, write_packet, seek);
return s;
}
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;
}
}
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)
{
if (s->write_flag && s->buf_ptr > s->buffer) {
writeout(s, s->buffer, s->buf_ptr - s->buffer);
if (s->update_checksum) {
s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
s->buf_ptr - s->checksum_ptr);
s->checksum_ptr = s->buffer;
}
}
s->buf_ptr = 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)
{
flush_buffer(s);
s->must_flush = 0;
}
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;
whence &= ~AVSEEK_FORCE;
if(!s)
return AVERROR(EINVAL);
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;
offset += offset1;
}
if (offset < 0)
return AVERROR(EINVAL);
offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
if (!s->must_flush && (!s->direct || !s->seek) &&
offset1 >= 0 && offset1 <= buffer_size - s->write_flag) {
/* can do the seek inside the buffer */
s->buf_ptr = s->buffer + offset1;
} else if ((!s->seekable ||
offset1 <= buffer_size + s->short_seek_threshold) &&
!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);
s->must_flush = 1;
}
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->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->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;
}
#if FF_API_URL_FEOF
int url_feof(AVIOContext *s)
{
return avio_feof(s);
}
#endif
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
int ff_get_v_length(uint64_t val)
{
int i = 1;
while (val >>= 7)
i++;
return i;
}
void ff_put_v(AVIOContext *bc, uint64_t val)
{
int i = ff_get_v_length(val);
while (--i > 0)
avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
avio_w8(bc, val & 127);
}
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 (!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;
}
/* 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) {
if (dst == s->buffer) {
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;
}
av_assert0(len >= s->orig_buffer_size);
len = s->orig_buffer_size;
}
if (s->read_packet)
len = s->read_packet(s->opaque, dst, len);
else
len = 0;
if (len <= 0) {
/* do not modify buffer if EOF reached so that a seek back can
be done without rereading data */
s->eof_reached = 1;
if (len < 0)
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
if(s->read_packet)
len = s->read_packet(s->opaque, buf, size);
if (len <= 0) {
/* do not modify buffer if EOF reached so that a seek back can
be done without rereading data */
s->eof_reached = 1;
if(len<0)
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 AVERROR_INVALIDDATA;
return ret;
}
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 ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
{
int len;
if (size < 0)
return -1;
if (s->read_packet && s->write_flag) {
len = s->read_packet(s->opaque, buf, size);
if (len > 0)
s->pos += len;
return len;
}
len = s->buf_end - s->buf_ptr;
if (len == 0) {
/* Reset the buf_end pointer to the start of the buffer, to make sure
* the fill_buffer call tries to read as much data as fits into the
* full buffer, instead of just what space is left after buf_end.
* This avoids returning partial packets at the end of the buffer,
* for packet based inputs.
*/
s->buf_end = s->buf_ptr = s->buffer;
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 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;
}
static int io_read_packet(void *opaque, uint8_t *buf, int buf_size)
{
AVIOInternal *internal = opaque;
return ffurl_read(internal->h, buf, buf_size);
}
static int io_write_packet(void *opaque, uint8_t *buf, int buf_size)
{
AVIOInternal *internal = opaque;
return ffurl_write(internal->h, buf, buf_size);
}
static int64_t io_seek(void *opaque, int64_t offset, int whence)
{
AVIOInternal *internal = opaque;
return ffurl_seek(internal->h, offset, whence);
}
static int io_read_pause(void *opaque, int pause)
{
AVIOInternal *internal = opaque;
if (!internal->h->prot->url_read_pause)
return AVERROR(ENOSYS);
return internal->h->prot->url_read_pause(internal->h, pause);
}
static int64_t io_read_seek(void *opaque, int stream_index, int64_t timestamp, int flags)
{
AVIOInternal *internal = opaque;
if (!internal->h->prot->url_read_seek)
return AVERROR(ENOSYS);
return internal->h->prot->url_read_seek(internal->h, stream_index, timestamp, flags);
}
int ffio_fdopen(AVIOContext **s, URLContext *h)
{
AVIOInternal *internal = NULL;
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;
}
buffer = av_malloc(buffer_size);
if (!buffer)
return AVERROR(ENOMEM);
internal = av_mallocz(sizeof(*internal));
if (!internal)
goto fail;
internal->h = h;
*s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE,
internal, io_read_packet, io_write_packet, io_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;
if(h->prot) {
(*s)->read_pause = io_read_pause;
(*s)->read_seek = io_read_seek;
}
(*s)->av_class = &ff_avio_class;
return 0;
fail:
av_freep(&internal);
av_freep(&buffer);
return AVERROR(ENOMEM);
}
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;
int filled = s->buf_end - s->buffer;
ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
buf_size += s->buf_ptr - s->buffer + max_buffer_size;
if (buf_size < filled || s->seekable || !s->read_packet)
return 0;
av_assert0(!s->write_flag);
buffer = av_malloc(buf_size);
if (!buffer)
return AVERROR(ENOMEM);
memcpy(buffer, s->buffer, filled);
av_free(s->buffer);
s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
s->buf_end = buffer + (s->buf_end - s->buffer);
s->buffer = buffer;
s->buffer_size = buf_size;
if (checksum_ptr_offset >= 0)
s->checksum_ptr = s->buffer + checksum_ptr_offset;
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 = buffer;
url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
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;
s->must_flush = 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;
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 ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
const AVIOInterruptCB *int_cb, AVDictionary **options)
{
return ffio_open_whitelist(pb, url, flags, int_cb, options, s->protocol_whitelist, s->protocol_blacklist);
}
int avio_close(AVIOContext *s)
{
AVIOInternal *internal;
URLContext *h;
if (!s)
return 0;
avio_flush(s);
internal = s->opaque;
h = internal->h;
av_freep(&s->opaque);
av_freep(&s->buffer);
if (s->write_flag)
av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
else
av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
av_opt_free(s);
av_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;
char buf[4096]; /* update doc entry in avio.h if changed */
int ret;
va_start(ap, fmt);
ret = vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
avio_write(s, buf, strlen(buf));
return ret;
}
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;
AVIOInternal *internal = s->opaque;
URLContext *sc = internal->h;
URLContext *cc = NULL;
ret = ffurl_accept(sc, &cc);
if (ret < 0)
return ret;
return ffio_fdopen(c, cc);
}
int avio_handshake(AVIOContext *c)
{
AVIOInternal *internal = c->opaque;
URLContext *cc = internal->h;
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, new_allocated_size;
/* reallocate buffer if needed */
new_size = d->pos + buf_size;
new_allocated_size = d->allocated_size;
if (new_size < d->pos || new_size > INT_MAX/2)
return -1;
while (new_size > new_allocated_size) {
if (!new_allocated_size)
new_allocated_size = new_size;
else
new_allocated_size += new_allocated_size / 2 + 1;
}
if (new_allocated_size > d->allocated_size) {
int err;
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 || offset > 0x7fffffffLL)
return -1;
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 -1;
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 -1;
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;
}
avio_flush(s);
d = s->opaque;
*pbuffer = d->buffer;
return d->size;
}
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);
av_free(s);
return size - padding;
}
void ffio_free_dyn_buf(AVIOContext **s)
{
uint8_t *tmp;
if (!*s)
return;
avio_close_dyn_buf(*s, &tmp);
av_free(tmp);
*s = NULL;
}
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);
av_free(s);
return size;
}
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