chasing indexing error

1 files changed, 0 insertions, 1096 deletions

diff --git a/ffmpeg/libavformat/aviobuf.c b/ffmpeg/libavformat/aviobuf.c
deleted file mode 100644
index eb5a6e5..0000000
--- a/ffmpeg/libavformat/aviobuf.c
+++ /dev/null
@@ -1,1096 +0,0 @@
-/*
- * 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/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
-
-static void *ffio_url_child_next(void *obj, void *prev)
-{
-    AVIOContext *s = obj;
-    return prev ? NULL : s->opaque;
-}
-
-static const AVClass *ffio_url_child_class_next(const AVClass *prev)
-{
-    return prev ? NULL : &ffurl_context_class;
-}
-
-static const AVOption ffio_url_options[] = {
-    { NULL },
-};
-
-const AVClass ffio_url_class = {
-    .class_name = "AVIOContext",
-    .item_name  = av_default_item_name,
-    .version    = LIBAVUTIL_VERSION_INT,
-    .option     = ffio_url_options,
-    .child_next = ffio_url_child_next,
-    .child_class_next = ffio_url_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->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;
-
-    if (!read_packet && !write_flag) {
-        s->pos     = buffer_size;
-        s->buf_end = s->buffer + buffer_size;
-    }
-    s->read_pause = NULL;
-    s->read_seek  = NULL;
-
-    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->write_packet && !s->error) {
-        int ret = s->write_packet(s->opaque, (uint8_t *)data, len);
-        if (ret < 0) {
-            s->error = ret;
-        }
-    }
-    s->writeout_count ++;
-    s->pos += len;
-}
-
-static void flush_buffer(AVIOContext *s)
-{
-    if (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;
-}
-
-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;
-    whence &= ~AVSEEK_FORCE;
-
-    if(!s)
-        return AVERROR(EINVAL);
-
-    pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
-
-    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;
-    }
-    offset1 = offset - pos;
-    if (!s->must_flush && (!s->direct || !s->seek) &&
-        offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
-        /* can do the seek inside the buffer */
-        s->buf_ptr = s->buffer + offset1;
-    } else if ((!s->seekable ||
-               offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) &&
-               !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 + offset - s->pos;
-    } 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 url_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;
-}
-
-int avio_put_str16le(AVIOContext *s, const char *str)
-{
-    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, avio_wl16(s, tmp); ret += 2;)
-        continue;
-invalid:
-        av_log(s, AV_LOG_ERROR, "Invaid UTF8 sequence in avio_put_str16le\n");
-        err = AVERROR(EINVAL);
-    }
-    avio_wl16(s, 0);
-    if (err)
-        return err;
-    ret += 2;
-    return ret;
-}
-
-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);
-}
-
-/* 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->buffer_size > max_buffer_size) {
-        if (dst == s->buffer) {
-            ffio_set_buf_size(s, max_buffer_size);
-
-            s->checksum_ptr = dst = s->buffer;
-        }
-        av_assert0(len >= max_buffer_size);
-        len = max_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 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 = s->buf_end - s->buf_ptr;
-        if (len > size)
-            len = size;
-        if (len == 0 || s->write_flag) {
-            if((s->direct || size > s->buffer_size) && !s->update_checksum){
-                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;
-                    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 (url_feof(s))   return AVERROR_EOF;
-    }
-    return size1 - size;
-}
-
-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 (url_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);
-
-    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;
-}
-
-int ffio_fdopen(AVIOContext **s, URLContext *h)
-{
-    uint8_t *buffer;
-    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);
-
-    *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h,
-                            (void*)ffurl_read, (void*)ffurl_write, (void*)ffurl_seek);
-    if (!*s) {
-        av_free(buffer);
-        return AVERROR(ENOMEM);
-    }
-    (*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 = (int (*)(void *, int))h->prot->url_read_pause;
-        (*s)->read_seek  = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
-    }
-    (*s)->av_class = &ffio_url_class;
-    return 0;
-}
-
-int ffio_ensure_seekback(AVIOContext *s, int buf_size)
-{
-    uint8_t *buffer;
-    int max_buffer_size = s->max_packet_size ?
-                          s->max_packet_size : IO_BUFFER_SIZE;
-
-    buf_size += s->buf_ptr - s->buffer + max_buffer_size;
-
-    if (buf_size < s->buffer_size || s->seekable)
-        return 0;
-    av_assert0(!s->write_flag);
-
-    buffer = av_malloc(buf_size);
-    if (!buffer)
-        return AVERROR(ENOMEM);
-
-    memcpy(buffer, s->buffer, s->buffer_size);
-    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;
-    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->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 avio_open2(AVIOContext **s, const char *filename, int flags,
-               const AVIOInterruptCB *int_cb, AVDictionary **options)
-{
-    URLContext *h;
-    int err;
-
-    err = ffurl_open(&h, filename, flags, int_cb, options);
-    if (err < 0)
-        return err;
-    err = ffio_fdopen(s, h);
-    if (err < 0) {
-        ffurl_close(h);
-        return err;
-    }
-    return 0;
-}
-
-int avio_close(AVIOContext *s)
-{
-    URLContext *h;
-
-    if (!s)
-        return 0;
-
-    avio_flush(s);
-    h = 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_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];
-    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)
-{
-    URLContext *h = s->opaque;
-    int64_t ret;
-    if (!s->read_seek)
-        return AVERROR(ENOSYS);
-    ret = s->read_seek(h, stream_index, timestamp, flags);
-    if (ret >= 0) {
-        int64_t pos;
-        s->buf_ptr = s->buf_end; // Flush buffer
-        pos = s->seek(h, 0, SEEK_CUR);
-        if (pos >= 0)
-            s->pos = pos;
-        else if (pos != AVERROR(ENOSYS))
-            ret = pos;
-    }
-    return ret;
-}
-
-/* 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_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
-{
-    DynBuffer *d;
-    int size;
-    static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
-    int padding = 0;
-
-    if (!s) {
-        *pbuffer = NULL;
-        return 0;
-    }
-    d = s->opaque;
-
-    /* don't attempt to pad fixed-size packet buffers */
-    if (!s->max_packet_size) {
-        avio_write(s, padbuf, sizeof(padbuf));
-        padding = FF_INPUT_BUFFER_PADDING_SIZE;
-    }
-
-    avio_flush(s);
-
-    *pbuffer = d->buffer;
-    size = d->size;
-    av_free(d);
-    av_free(s);
-    return size - padding;
-}
-
-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;
-}