forked from KolibriOS/kolibrios
1218 lines
30 KiB
C
1218 lines
30 KiB
C
/*
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* buffered I/O
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* Copyright (c) 2000,2001 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/bprint.h"
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#include "libavutil/crc.h"
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#include "libavutil/dict.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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#include "libavutil/avassert.h"
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#include "avformat.h"
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#include "avio.h"
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#include "avio_internal.h"
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#include "internal.h"
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#include "url.h"
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#include <stdarg.h>
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#define IO_BUFFER_SIZE 32768
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/**
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* Do seeks within this distance ahead of the current buffer by skipping
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* data instead of calling the protocol seek function, for seekable
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* protocols.
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*/
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#define SHORT_SEEK_THRESHOLD 4096
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static void *ff_avio_child_next(void *obj, void *prev)
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{
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AVIOContext *s = obj;
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return prev ? NULL : s->opaque;
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}
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static const AVClass *ff_avio_child_class_next(const AVClass *prev)
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{
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return prev ? NULL : &ffurl_context_class;
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}
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static const AVOption ff_avio_options[] = {
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{ NULL },
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};
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const AVClass ff_avio_class = {
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.class_name = "AVIOContext",
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.item_name = av_default_item_name,
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.version = LIBAVUTIL_VERSION_INT,
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.option = ff_avio_options,
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.child_next = ff_avio_child_next,
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.child_class_next = ff_avio_child_class_next,
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};
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static void fill_buffer(AVIOContext *s);
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static int url_resetbuf(AVIOContext *s, int flags);
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int ffio_init_context(AVIOContext *s,
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unsigned char *buffer,
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int buffer_size,
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int write_flag,
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void *opaque,
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
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int64_t (*seek)(void *opaque, int64_t offset, int whence))
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{
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s->buffer = buffer;
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s->orig_buffer_size =
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s->buffer_size = buffer_size;
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s->buf_ptr = buffer;
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s->opaque = opaque;
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s->direct = 0;
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url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
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s->write_packet = write_packet;
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s->read_packet = read_packet;
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s->seek = seek;
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s->pos = 0;
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s->must_flush = 0;
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s->eof_reached = 0;
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s->error = 0;
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s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0;
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s->max_packet_size = 0;
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s->update_checksum = NULL;
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s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
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if (!read_packet && !write_flag) {
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s->pos = buffer_size;
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s->buf_end = s->buffer + buffer_size;
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}
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s->read_pause = NULL;
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s->read_seek = NULL;
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return 0;
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}
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AVIOContext *avio_alloc_context(
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unsigned char *buffer,
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int buffer_size,
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int write_flag,
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void *opaque,
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
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int64_t (*seek)(void *opaque, int64_t offset, int whence))
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{
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AVIOContext *s = av_mallocz(sizeof(AVIOContext));
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if (!s)
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return NULL;
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ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
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read_packet, write_packet, seek);
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return s;
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}
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static void writeout(AVIOContext *s, const uint8_t *data, int len)
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{
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if (s->write_packet && !s->error) {
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int ret = s->write_packet(s->opaque, (uint8_t *)data, len);
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if (ret < 0) {
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s->error = ret;
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}
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}
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s->writeout_count ++;
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s->pos += len;
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}
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static void flush_buffer(AVIOContext *s)
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{
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if (s->write_flag && s->buf_ptr > s->buffer) {
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writeout(s, s->buffer, s->buf_ptr - s->buffer);
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if (s->update_checksum) {
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s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
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s->buf_ptr - s->checksum_ptr);
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s->checksum_ptr = s->buffer;
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}
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}
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s->buf_ptr = s->buffer;
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if (!s->write_flag)
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s->buf_end = s->buffer;
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}
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void avio_w8(AVIOContext *s, int b)
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{
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av_assert2(b>=-128 && b<=255);
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*s->buf_ptr++ = b;
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if (s->buf_ptr >= s->buf_end)
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flush_buffer(s);
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}
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void ffio_fill(AVIOContext *s, int b, int count)
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{
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while (count > 0) {
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int len = FFMIN(s->buf_end - s->buf_ptr, count);
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memset(s->buf_ptr, b, len);
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s->buf_ptr += len;
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if (s->buf_ptr >= s->buf_end)
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flush_buffer(s);
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count -= len;
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}
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}
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void avio_write(AVIOContext *s, const unsigned char *buf, int size)
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{
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if (s->direct && !s->update_checksum) {
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avio_flush(s);
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writeout(s, buf, size);
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return;
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}
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while (size > 0) {
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int len = FFMIN(s->buf_end - s->buf_ptr, size);
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memcpy(s->buf_ptr, buf, len);
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s->buf_ptr += len;
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if (s->buf_ptr >= s->buf_end)
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flush_buffer(s);
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buf += len;
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size -= len;
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}
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}
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void avio_flush(AVIOContext *s)
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{
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flush_buffer(s);
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s->must_flush = 0;
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}
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int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
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{
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int64_t offset1;
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int64_t pos;
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int force = whence & AVSEEK_FORCE;
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int buffer_size;
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whence &= ~AVSEEK_FORCE;
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if(!s)
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return AVERROR(EINVAL);
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buffer_size = s->buf_end - s->buffer;
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pos = s->pos - (s->write_flag ? 0 : buffer_size);
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if (whence != SEEK_CUR && whence != SEEK_SET)
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return AVERROR(EINVAL);
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if (whence == SEEK_CUR) {
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offset1 = pos + (s->buf_ptr - s->buffer);
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if (offset == 0)
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return offset1;
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offset += offset1;
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}
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if (offset < 0)
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return AVERROR(EINVAL);
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offset1 = offset - pos;
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if (!s->must_flush && (!s->direct || !s->seek) &&
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offset1 >= 0 && offset1 <= buffer_size - s->write_flag) {
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/* can do the seek inside the buffer */
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s->buf_ptr = s->buffer + offset1;
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} else if ((!s->seekable ||
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offset1 <= s->buf_end + s->short_seek_threshold - s->buffer) &&
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!s->write_flag && offset1 >= 0 &&
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(!s->direct || !s->seek) &&
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(whence != SEEK_END || force)) {
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while(s->pos < offset && !s->eof_reached)
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fill_buffer(s);
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if (s->eof_reached)
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return AVERROR_EOF;
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s->buf_ptr = s->buf_end + offset - s->pos;
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} else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
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int64_t res;
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pos -= FFMIN(buffer_size>>1, pos);
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if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
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return res;
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s->buf_end =
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s->buf_ptr = s->buffer;
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s->pos = pos;
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s->eof_reached = 0;
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fill_buffer(s);
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return avio_seek(s, offset, SEEK_SET | force);
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} else {
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int64_t res;
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if (s->write_flag) {
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flush_buffer(s);
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s->must_flush = 1;
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}
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if (!s->seek)
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return AVERROR(EPIPE);
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if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
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return res;
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s->seek_count ++;
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if (!s->write_flag)
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s->buf_end = s->buffer;
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s->buf_ptr = s->buffer;
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s->pos = offset;
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}
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s->eof_reached = 0;
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return offset;
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}
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int64_t avio_skip(AVIOContext *s, int64_t offset)
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{
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return avio_seek(s, offset, SEEK_CUR);
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}
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int64_t avio_size(AVIOContext *s)
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{
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int64_t size;
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if (!s)
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return AVERROR(EINVAL);
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if (!s->seek)
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return AVERROR(ENOSYS);
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size = s->seek(s->opaque, 0, AVSEEK_SIZE);
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if (size < 0) {
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if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
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return size;
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size++;
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s->seek(s->opaque, s->pos, SEEK_SET);
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}
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return size;
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}
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int avio_feof(AVIOContext *s)
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{
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if(!s)
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return 0;
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if(s->eof_reached){
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s->eof_reached=0;
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fill_buffer(s);
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}
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return s->eof_reached;
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}
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#if FF_API_URL_FEOF
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int url_feof(AVIOContext *s)
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{
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return avio_feof(s);
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}
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#endif
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void avio_wl32(AVIOContext *s, unsigned int val)
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{
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avio_w8(s, (uint8_t) val );
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avio_w8(s, (uint8_t)(val >> 8 ));
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avio_w8(s, (uint8_t)(val >> 16));
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avio_w8(s, val >> 24 );
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}
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void avio_wb32(AVIOContext *s, unsigned int val)
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{
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avio_w8(s, val >> 24 );
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avio_w8(s, (uint8_t)(val >> 16));
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avio_w8(s, (uint8_t)(val >> 8 ));
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avio_w8(s, (uint8_t) val );
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}
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int avio_put_str(AVIOContext *s, const char *str)
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{
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int len = 1;
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if (str) {
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len += strlen(str);
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avio_write(s, (const unsigned char *) str, len);
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} else
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avio_w8(s, 0);
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return len;
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}
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static inline int put_str16(AVIOContext *s, const char *str, const int be)
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{
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const uint8_t *q = str;
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int ret = 0;
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int err = 0;
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while (*q) {
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uint32_t ch;
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uint16_t tmp;
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GET_UTF8(ch, *q++, goto invalid;)
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PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
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ret += 2;)
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continue;
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invalid:
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av_log(s, AV_LOG_ERROR, "Invaid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
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err = AVERROR(EINVAL);
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if (!*(q-1))
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break;
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}
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if (be)
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avio_wb16(s, 0);
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else
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avio_wl16(s, 0);
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if (err)
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return err;
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ret += 2;
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return ret;
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}
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#define PUT_STR16(type, big_endian) \
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int avio_put_str16 ## type(AVIOContext *s, const char *str) \
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{ \
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return put_str16(s, str, big_endian); \
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}
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PUT_STR16(le, 0)
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PUT_STR16(be, 1)
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#undef PUT_STR16
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int ff_get_v_length(uint64_t val)
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{
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int i = 1;
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while (val >>= 7)
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i++;
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return i;
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}
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void ff_put_v(AVIOContext *bc, uint64_t val)
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{
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int i = ff_get_v_length(val);
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while (--i > 0)
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avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
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avio_w8(bc, val & 127);
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}
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void avio_wl64(AVIOContext *s, uint64_t val)
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{
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avio_wl32(s, (uint32_t)(val & 0xffffffff));
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avio_wl32(s, (uint32_t)(val >> 32));
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}
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void avio_wb64(AVIOContext *s, uint64_t val)
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{
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avio_wb32(s, (uint32_t)(val >> 32));
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avio_wb32(s, (uint32_t)(val & 0xffffffff));
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}
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void avio_wl16(AVIOContext *s, unsigned int val)
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{
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avio_w8(s, (uint8_t)val);
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avio_w8(s, (int)val >> 8);
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}
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void avio_wb16(AVIOContext *s, unsigned int val)
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{
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avio_w8(s, (int)val >> 8);
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avio_w8(s, (uint8_t)val);
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}
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void avio_wl24(AVIOContext *s, unsigned int val)
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{
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avio_wl16(s, val & 0xffff);
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avio_w8(s, (int)val >> 16);
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}
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void avio_wb24(AVIOContext *s, unsigned int val)
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{
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avio_wb16(s, (int)val >> 8);
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avio_w8(s, (uint8_t)val);
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}
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/* Input stream */
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static void fill_buffer(AVIOContext *s)
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{
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int max_buffer_size = s->max_packet_size ?
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s->max_packet_size : IO_BUFFER_SIZE;
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uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
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s->buf_end : s->buffer;
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int len = s->buffer_size - (dst - s->buffer);
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/* can't fill the buffer without read_packet, just set EOF if appropriate */
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if (!s->read_packet && s->buf_ptr >= s->buf_end)
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s->eof_reached = 1;
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/* no need to do anything if EOF already reached */
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if (s->eof_reached)
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return;
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if (s->update_checksum && dst == s->buffer) {
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if (s->buf_end > s->checksum_ptr)
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s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
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s->buf_end - s->checksum_ptr);
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s->checksum_ptr = s->buffer;
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}
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/* make buffer smaller in case it ended up large after probing */
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if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
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if (dst == s->buffer) {
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int ret = ffio_set_buf_size(s, s->orig_buffer_size);
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if (ret < 0)
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av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
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s->checksum_ptr = dst = s->buffer;
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}
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av_assert0(len >= s->orig_buffer_size);
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len = s->orig_buffer_size;
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}
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if (s->read_packet)
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len = s->read_packet(s->opaque, dst, len);
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else
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len = 0;
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if (len <= 0) {
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/* do not modify buffer if EOF reached so that a seek back can
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be done without rereading data */
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s->eof_reached = 1;
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if (len < 0)
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s->error = len;
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} else {
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s->pos += len;
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s->buf_ptr = dst;
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s->buf_end = dst + len;
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s->bytes_read += len;
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}
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}
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unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
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unsigned int len)
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{
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return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
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}
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unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
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unsigned int len)
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{
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return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
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}
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|
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unsigned long ffio_get_checksum(AVIOContext *s)
|
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{
|
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s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
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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 (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;
|
|
}
|
|
|
|
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,
|
|
(int (*)(void *, uint8_t *, int)) ffurl_read,
|
|
(int (*)(void *, uint8_t *, int)) ffurl_write,
|
|
(int64_t (*)(void *, int64_t, int)) 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 = &ff_avio_class;
|
|
return 0;
|
|
}
|
|
|
|
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 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 ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
|
|
const AVIOInterruptCB *int_cb, AVDictionary **options)
|
|
{
|
|
return avio_open2(pb, url, flags, int_cb, options);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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, 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[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;
|
|
}
|