ffmpeg / libavformat / aviobuf.c @ 4efd5cf3
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/*
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* Buffered I/O for ffmpeg system
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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/crc.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "avio.h" |
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#include "internal.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 fill_buffer(ByteIOContext *s); |
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#if !FF_API_URL_RESETBUF
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static int url_resetbuf(ByteIOContext *s, int flags); |
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#endif
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int init_put_byte(ByteIOContext *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->buffer_size = buffer_size; |
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s->buf_ptr = buffer; |
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s->opaque = opaque; |
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url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY); |
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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->is_streamed = 0;
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s->max_packet_size = 0;
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s->update_checksum= NULL;
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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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ByteIOContext *av_alloc_put_byte( |
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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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ByteIOContext *s = av_mallocz(sizeof(ByteIOContext));
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init_put_byte(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 flush_buffer(ByteIOContext *s) |
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{ |
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if (s->buf_ptr > s->buffer) {
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if (s->write_packet && !s->error){
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int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
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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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if(s->update_checksum){
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s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr); |
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s->checksum_ptr= s->buffer; |
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} |
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s->pos += s->buf_ptr - s->buffer; |
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} |
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s->buf_ptr = s->buffer; |
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} |
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void put_byte(ByteIOContext *s, int b) |
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{ |
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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 put_nbyte(ByteIOContext *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 put_buffer(ByteIOContext *s, const unsigned char *buf, int size) |
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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 put_flush_packet(ByteIOContext *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 url_fseek(ByteIOContext *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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whence &= ~AVSEEK_FORCE; |
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if(!s)
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return AVERROR(EINVAL);
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pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
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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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offset1 = offset - pos; |
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if (!s->must_flush &&
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offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
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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->is_streamed || |
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offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) && |
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!s->write_flag && offset1 >= 0 &&
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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 {
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int64_t res; |
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#if CONFIG_MUXERS || CONFIG_NETWORK
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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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#endif /* CONFIG_MUXERS || CONFIG_NETWORK */ |
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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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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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int url_fskip(ByteIOContext *s, int64_t offset)
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{ |
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int64_t ret = url_fseek(s, offset, SEEK_CUR); |
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return ret < 0 ? ret : 0; |
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} |
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int64_t url_ftell(ByteIOContext *s) |
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{ |
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return url_fseek(s, 0, SEEK_CUR); |
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} |
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int64_t url_fsize(ByteIOContext *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 url_feof(ByteIOContext *s)
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{ |
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if(!s)
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return 0; |
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return s->eof_reached;
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} |
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int url_ferror(ByteIOContext *s)
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{ |
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if(!s)
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return 0; |
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return s->error;
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} |
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void put_le32(ByteIOContext *s, unsigned int val) |
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{ |
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put_byte(s, val); |
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put_byte(s, val >> 8);
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put_byte(s, val >> 16);
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put_byte(s, val >> 24);
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} |
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void put_be32(ByteIOContext *s, unsigned int val) |
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{ |
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put_byte(s, val >> 24);
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put_byte(s, val >> 16);
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put_byte(s, val >> 8);
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put_byte(s, val); |
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} |
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#if FF_API_OLD_AVIO
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void put_strz(ByteIOContext *s, const char *str) |
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{ |
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avio_put_str(s, str); |
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} |
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#endif
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int avio_put_str(ByteIOContext *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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put_buffer(s, (const unsigned char *) str, len); |
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} else
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put_byte(s, 0);
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return len;
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} |
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int ff_get_v_length(uint64_t val){
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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(ByteIOContext *bc, uint64_t val){
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int i= ff_get_v_length(val);
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while(--i>0) |
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put_byte(bc, 128 | (val>>(7*i))); |
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put_byte(bc, val&127);
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} |
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void put_le64(ByteIOContext *s, uint64_t val)
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{ |
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put_le32(s, (uint32_t)(val & 0xffffffff));
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put_le32(s, (uint32_t)(val >> 32));
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} |
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void put_be64(ByteIOContext *s, uint64_t val)
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{ |
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put_be32(s, (uint32_t)(val >> 32));
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put_be32(s, (uint32_t)(val & 0xffffffff));
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} |
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void put_le16(ByteIOContext *s, unsigned int val) |
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{ |
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put_byte(s, val); |
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put_byte(s, val >> 8);
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} |
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void put_be16(ByteIOContext *s, unsigned int val) |
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{ |
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put_byte(s, val >> 8);
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put_byte(s, val); |
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} |
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void put_le24(ByteIOContext *s, unsigned int val) |
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{ |
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put_le16(s, val & 0xffff);
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put_byte(s, val >> 16);
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} |
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void put_be24(ByteIOContext *s, unsigned int val) |
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{ |
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put_be16(s, val >> 8);
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put_byte(s, val); |
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} |
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void put_tag(ByteIOContext *s, const char *tag) |
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{ |
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while (*tag) {
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put_byte(s, *tag++); |
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} |
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} |
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/* Input stream */
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static void fill_buffer(ByteIOContext *s) |
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{ |
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uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer; |
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int len= s->buffer_size - (dst - s->buffer);
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int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
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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, 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->buffer_size > max_buffer_size) {
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url_setbufsize(s, max_buffer_size); |
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s->checksum_ptr = dst = s->buffer; |
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len = s->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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} |
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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 get_checksum(ByteIOContext *s) |
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{ |
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s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr); |
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s->update_checksum= NULL;
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return s->checksum;
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} |
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void init_checksum(ByteIOContext *s,
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unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), |
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unsigned long checksum) |
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{ |
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s->update_checksum= update_checksum; |
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if(s->update_checksum){
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s->checksum= checksum; |
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s->checksum_ptr= s->buf_ptr; |
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} |
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} |
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/* XXX: put an inline version */
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int get_byte(ByteIOContext *s)
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{ |
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if (s->buf_ptr >= s->buf_end)
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fill_buffer(s); |
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if (s->buf_ptr < s->buf_end)
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return *s->buf_ptr++;
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return 0; |
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} |
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int url_fgetc(ByteIOContext *s)
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{ |
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if (s->buf_ptr >= s->buf_end)
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fill_buffer(s); |
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if (s->buf_ptr < s->buf_end)
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return *s->buf_ptr++;
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return URL_EOF;
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} |
432 |
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int get_buffer(ByteIOContext *s, unsigned char *buf, int size) |
434 |
{ |
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int len, size1;
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size1 = size; |
438 |
while (size > 0) { |
439 |
len = s->buf_end - s->buf_ptr; |
440 |
if (len > size)
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len = size; |
442 |
if (len == 0) { |
443 |
if(size > s->buffer_size && !s->update_checksum){
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if(s->read_packet)
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len = s->read_packet(s->opaque, buf, size); |
446 |
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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450 |
if(len<0) |
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s->error= len; |
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break;
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} else {
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s->pos += len; |
455 |
size -= len; |
456 |
buf += len; |
457 |
s->buf_ptr = s->buffer; |
458 |
s->buf_end = s->buffer/* + len*/;
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} |
460 |
}else{
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fill_buffer(s); |
462 |
len = s->buf_end - s->buf_ptr; |
463 |
if (len == 0) |
464 |
break;
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465 |
} |
466 |
} else {
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memcpy(buf, s->buf_ptr, len); |
468 |
buf += len; |
469 |
s->buf_ptr += len; |
470 |
size -= len; |
471 |
} |
472 |
} |
473 |
if (size1 == size) {
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if (url_ferror(s)) return url_ferror(s); |
475 |
if (url_feof(s)) return AVERROR_EOF; |
476 |
} |
477 |
return size1 - size;
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} |
479 |
|
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int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size) |
481 |
{ |
482 |
int len;
|
483 |
|
484 |
if(size<0) |
485 |
return -1; |
486 |
|
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len = s->buf_end - s->buf_ptr; |
488 |
if (len == 0) { |
489 |
fill_buffer(s); |
490 |
len = s->buf_end - s->buf_ptr; |
491 |
} |
492 |
if (len > size)
|
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len = size; |
494 |
memcpy(buf, s->buf_ptr, len); |
495 |
s->buf_ptr += len; |
496 |
if (!len) {
|
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if (url_ferror(s)) return url_ferror(s); |
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if (url_feof(s)) return AVERROR_EOF; |
499 |
} |
500 |
return len;
|
501 |
} |
502 |
|
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unsigned int get_le16(ByteIOContext *s) |
504 |
{ |
505 |
unsigned int val; |
506 |
val = get_byte(s); |
507 |
val |= get_byte(s) << 8;
|
508 |
return val;
|
509 |
} |
510 |
|
511 |
unsigned int get_le24(ByteIOContext *s) |
512 |
{ |
513 |
unsigned int val; |
514 |
val = get_le16(s); |
515 |
val |= get_byte(s) << 16;
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return val;
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} |
518 |
|
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unsigned int get_le32(ByteIOContext *s) |
520 |
{ |
521 |
unsigned int val; |
522 |
val = get_le16(s); |
523 |
val |= get_le16(s) << 16;
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524 |
return val;
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525 |
} |
526 |
|
527 |
uint64_t get_le64(ByteIOContext *s) |
528 |
{ |
529 |
uint64_t val; |
530 |
val = (uint64_t)get_le32(s); |
531 |
val |= (uint64_t)get_le32(s) << 32;
|
532 |
return val;
|
533 |
} |
534 |
|
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unsigned int get_be16(ByteIOContext *s) |
536 |
{ |
537 |
unsigned int val; |
538 |
val = get_byte(s) << 8;
|
539 |
val |= get_byte(s); |
540 |
return val;
|
541 |
} |
542 |
|
543 |
unsigned int get_be24(ByteIOContext *s) |
544 |
{ |
545 |
unsigned int val; |
546 |
val = get_be16(s) << 8;
|
547 |
val |= get_byte(s); |
548 |
return val;
|
549 |
} |
550 |
unsigned int get_be32(ByteIOContext *s) |
551 |
{ |
552 |
unsigned int val; |
553 |
val = get_be16(s) << 16;
|
554 |
val |= get_be16(s); |
555 |
return val;
|
556 |
} |
557 |
|
558 |
char *get_strz(ByteIOContext *s, char *buf, int maxlen) |
559 |
{ |
560 |
int i = 0; |
561 |
char c;
|
562 |
|
563 |
while ((c = get_byte(s))) {
|
564 |
if (i < maxlen-1) |
565 |
buf[i++] = c; |
566 |
} |
567 |
|
568 |
buf[i] = 0; /* Ensure null terminated, but may be truncated */ |
569 |
|
570 |
return buf;
|
571 |
} |
572 |
|
573 |
int ff_get_line(ByteIOContext *s, char *buf, int maxlen) |
574 |
{ |
575 |
int i = 0; |
576 |
char c;
|
577 |
|
578 |
do {
|
579 |
c = get_byte(s); |
580 |
if (c && i < maxlen-1) |
581 |
buf[i++] = c; |
582 |
} while (c != '\n' && c); |
583 |
|
584 |
buf[i] = 0;
|
585 |
return i;
|
586 |
} |
587 |
|
588 |
uint64_t get_be64(ByteIOContext *s) |
589 |
{ |
590 |
uint64_t val; |
591 |
val = (uint64_t)get_be32(s) << 32;
|
592 |
val |= (uint64_t)get_be32(s); |
593 |
return val;
|
594 |
} |
595 |
|
596 |
uint64_t ff_get_v(ByteIOContext *bc){ |
597 |
uint64_t val = 0;
|
598 |
int tmp;
|
599 |
|
600 |
do{
|
601 |
tmp = get_byte(bc); |
602 |
val= (val<<7) + (tmp&127); |
603 |
}while(tmp&128); |
604 |
return val;
|
605 |
} |
606 |
|
607 |
int url_fdopen(ByteIOContext **s, URLContext *h)
|
608 |
{ |
609 |
uint8_t *buffer; |
610 |
int buffer_size, max_packet_size;
|
611 |
|
612 |
max_packet_size = url_get_max_packet_size(h); |
613 |
if (max_packet_size) {
|
614 |
buffer_size = max_packet_size; /* no need to bufferize more than one packet */
|
615 |
} else {
|
616 |
buffer_size = IO_BUFFER_SIZE; |
617 |
} |
618 |
buffer = av_malloc(buffer_size); |
619 |
if (!buffer)
|
620 |
return AVERROR(ENOMEM);
|
621 |
|
622 |
*s = av_mallocz(sizeof(ByteIOContext));
|
623 |
if(!*s) {
|
624 |
av_free(buffer); |
625 |
return AVERROR(ENOMEM);
|
626 |
} |
627 |
|
628 |
if (init_put_byte(*s, buffer, buffer_size,
|
629 |
(h->flags & URL_WRONLY || h->flags & URL_RDWR), h, |
630 |
url_read, url_write, url_seek) < 0) {
|
631 |
av_free(buffer); |
632 |
av_freep(s); |
633 |
return AVERROR(EIO);
|
634 |
} |
635 |
(*s)->is_streamed = h->is_streamed; |
636 |
(*s)->max_packet_size = max_packet_size; |
637 |
if(h->prot) {
|
638 |
(*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause; |
639 |
(*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek; |
640 |
} |
641 |
return 0; |
642 |
} |
643 |
|
644 |
int url_setbufsize(ByteIOContext *s, int buf_size) |
645 |
{ |
646 |
uint8_t *buffer; |
647 |
buffer = av_malloc(buf_size); |
648 |
if (!buffer)
|
649 |
return AVERROR(ENOMEM);
|
650 |
|
651 |
av_free(s->buffer); |
652 |
s->buffer = buffer; |
653 |
s->buffer_size = buf_size; |
654 |
s->buf_ptr = buffer; |
655 |
url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY); |
656 |
return 0; |
657 |
} |
658 |
|
659 |
#if FF_API_URL_RESETBUF
|
660 |
int url_resetbuf(ByteIOContext *s, int flags) |
661 |
#else
|
662 |
static int url_resetbuf(ByteIOContext *s, int flags) |
663 |
#endif
|
664 |
{ |
665 |
#if FF_API_URL_RESETBUF
|
666 |
if (flags & URL_RDWR)
|
667 |
return AVERROR(EINVAL);
|
668 |
#else
|
669 |
assert(flags == URL_WRONLY || flags == URL_RDONLY); |
670 |
#endif
|
671 |
|
672 |
if (flags & URL_WRONLY) {
|
673 |
s->buf_end = s->buffer + s->buffer_size; |
674 |
s->write_flag = 1;
|
675 |
} else {
|
676 |
s->buf_end = s->buffer; |
677 |
s->write_flag = 0;
|
678 |
} |
679 |
return 0; |
680 |
} |
681 |
|
682 |
int ff_rewind_with_probe_data(ByteIOContext *s, unsigned char *buf, int buf_size) |
683 |
{ |
684 |
int64_t buffer_start; |
685 |
int buffer_size;
|
686 |
int overlap, new_size, alloc_size;
|
687 |
|
688 |
if (s->write_flag)
|
689 |
return AVERROR(EINVAL);
|
690 |
|
691 |
buffer_size = s->buf_end - s->buffer; |
692 |
|
693 |
/* the buffers must touch or overlap */
|
694 |
if ((buffer_start = s->pos - buffer_size) > buf_size)
|
695 |
return AVERROR(EINVAL);
|
696 |
|
697 |
overlap = buf_size - buffer_start; |
698 |
new_size = buf_size + buffer_size - overlap; |
699 |
|
700 |
alloc_size = FFMAX(s->buffer_size, new_size); |
701 |
if (alloc_size > buf_size)
|
702 |
if (!(buf = av_realloc(buf, alloc_size)))
|
703 |
return AVERROR(ENOMEM);
|
704 |
|
705 |
if (new_size > buf_size) {
|
706 |
memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap); |
707 |
buf_size = new_size; |
708 |
} |
709 |
|
710 |
av_free(s->buffer); |
711 |
s->buf_ptr = s->buffer = buf; |
712 |
s->buffer_size = alloc_size; |
713 |
s->pos = buf_size; |
714 |
s->buf_end = s->buf_ptr + buf_size; |
715 |
s->eof_reached = 0;
|
716 |
s->must_flush = 0;
|
717 |
|
718 |
return 0; |
719 |
} |
720 |
|
721 |
int url_fopen(ByteIOContext **s, const char *filename, int flags) |
722 |
{ |
723 |
URLContext *h; |
724 |
int err;
|
725 |
|
726 |
err = url_open(&h, filename, flags); |
727 |
if (err < 0) |
728 |
return err;
|
729 |
err = url_fdopen(s, h); |
730 |
if (err < 0) { |
731 |
url_close(h); |
732 |
return err;
|
733 |
} |
734 |
return 0; |
735 |
} |
736 |
|
737 |
int url_fclose(ByteIOContext *s)
|
738 |
{ |
739 |
URLContext *h = s->opaque; |
740 |
|
741 |
av_free(s->buffer); |
742 |
av_free(s); |
743 |
return url_close(h);
|
744 |
} |
745 |
|
746 |
URLContext *url_fileno(ByteIOContext *s) |
747 |
{ |
748 |
return s->opaque;
|
749 |
} |
750 |
|
751 |
#if CONFIG_MUXERS
|
752 |
int url_fprintf(ByteIOContext *s, const char *fmt, ...) |
753 |
{ |
754 |
va_list ap; |
755 |
char buf[4096]; |
756 |
int ret;
|
757 |
|
758 |
va_start(ap, fmt); |
759 |
ret = vsnprintf(buf, sizeof(buf), fmt, ap);
|
760 |
va_end(ap); |
761 |
put_buffer(s, buf, strlen(buf)); |
762 |
return ret;
|
763 |
} |
764 |
#endif //CONFIG_MUXERS |
765 |
|
766 |
char *url_fgets(ByteIOContext *s, char *buf, int buf_size) |
767 |
{ |
768 |
int c;
|
769 |
char *q;
|
770 |
|
771 |
c = url_fgetc(s); |
772 |
if (c == EOF) |
773 |
return NULL; |
774 |
q = buf; |
775 |
for(;;) {
|
776 |
if (c == EOF || c == '\n') |
777 |
break;
|
778 |
if ((q - buf) < buf_size - 1) |
779 |
*q++ = c; |
780 |
c = url_fgetc(s); |
781 |
} |
782 |
if (buf_size > 0) |
783 |
*q = '\0';
|
784 |
return buf;
|
785 |
} |
786 |
|
787 |
int url_fget_max_packet_size(ByteIOContext *s)
|
788 |
{ |
789 |
return s->max_packet_size;
|
790 |
} |
791 |
|
792 |
int av_url_read_fpause(ByteIOContext *s, int pause) |
793 |
{ |
794 |
if (!s->read_pause)
|
795 |
return AVERROR(ENOSYS);
|
796 |
return s->read_pause(s->opaque, pause);
|
797 |
} |
798 |
|
799 |
int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
|
800 |
int64_t timestamp, int flags)
|
801 |
{ |
802 |
URLContext *h = s->opaque; |
803 |
int64_t ret; |
804 |
if (!s->read_seek)
|
805 |
return AVERROR(ENOSYS);
|
806 |
ret = s->read_seek(h, stream_index, timestamp, flags); |
807 |
if(ret >= 0) { |
808 |
int64_t pos; |
809 |
s->buf_ptr = s->buf_end; // Flush buffer
|
810 |
pos = s->seek(h, 0, SEEK_CUR);
|
811 |
if (pos >= 0) |
812 |
s->pos = pos; |
813 |
else if (pos != AVERROR(ENOSYS)) |
814 |
ret = pos; |
815 |
} |
816 |
return ret;
|
817 |
} |
818 |
|
819 |
/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
|
820 |
* back to the server even if CONFIG_MUXERS is false. */
|
821 |
#if CONFIG_MUXERS || CONFIG_NETWORK
|
822 |
/* buffer handling */
|
823 |
int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags) |
824 |
{ |
825 |
int ret;
|
826 |
*s = av_mallocz(sizeof(ByteIOContext));
|
827 |
if(!*s)
|
828 |
return AVERROR(ENOMEM);
|
829 |
ret = init_put_byte(*s, buf, buf_size, |
830 |
(flags & URL_WRONLY || flags & URL_RDWR), |
831 |
NULL, NULL, NULL, NULL); |
832 |
if(ret != 0) |
833 |
av_freep(s); |
834 |
return ret;
|
835 |
} |
836 |
|
837 |
int url_close_buf(ByteIOContext *s)
|
838 |
{ |
839 |
put_flush_packet(s); |
840 |
return s->buf_ptr - s->buffer;
|
841 |
} |
842 |
|
843 |
/* output in a dynamic buffer */
|
844 |
|
845 |
typedef struct DynBuffer { |
846 |
int pos, size, allocated_size;
|
847 |
uint8_t *buffer; |
848 |
int io_buffer_size;
|
849 |
uint8_t io_buffer[1];
|
850 |
} DynBuffer; |
851 |
|
852 |
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size) |
853 |
{ |
854 |
DynBuffer *d = opaque; |
855 |
unsigned new_size, new_allocated_size;
|
856 |
|
857 |
/* reallocate buffer if needed */
|
858 |
new_size = d->pos + buf_size; |
859 |
new_allocated_size = d->allocated_size; |
860 |
if(new_size < d->pos || new_size > INT_MAX/2) |
861 |
return -1; |
862 |
while (new_size > new_allocated_size) {
|
863 |
if (!new_allocated_size)
|
864 |
new_allocated_size = new_size; |
865 |
else
|
866 |
new_allocated_size += new_allocated_size / 2 + 1; |
867 |
} |
868 |
|
869 |
if (new_allocated_size > d->allocated_size) {
|
870 |
d->buffer = av_realloc(d->buffer, new_allocated_size); |
871 |
if(d->buffer == NULL) |
872 |
return AVERROR(ENOMEM);
|
873 |
d->allocated_size = new_allocated_size; |
874 |
} |
875 |
memcpy(d->buffer + d->pos, buf, buf_size); |
876 |
d->pos = new_size; |
877 |
if (d->pos > d->size)
|
878 |
d->size = d->pos; |
879 |
return buf_size;
|
880 |
} |
881 |
|
882 |
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size) |
883 |
{ |
884 |
unsigned char buf1[4]; |
885 |
int ret;
|
886 |
|
887 |
/* packetized write: output the header */
|
888 |
AV_WB32(buf1, buf_size); |
889 |
ret= dyn_buf_write(opaque, buf1, 4);
|
890 |
if(ret < 0) |
891 |
return ret;
|
892 |
|
893 |
/* then the data */
|
894 |
return dyn_buf_write(opaque, buf, buf_size);
|
895 |
} |
896 |
|
897 |
static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence) |
898 |
{ |
899 |
DynBuffer *d = opaque; |
900 |
|
901 |
if (whence == SEEK_CUR)
|
902 |
offset += d->pos; |
903 |
else if (whence == SEEK_END) |
904 |
offset += d->size; |
905 |
if (offset < 0 || offset > 0x7fffffffLL) |
906 |
return -1; |
907 |
d->pos = offset; |
908 |
return 0; |
909 |
} |
910 |
|
911 |
static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size) |
912 |
{ |
913 |
DynBuffer *d; |
914 |
int ret;
|
915 |
unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024; |
916 |
|
917 |
if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size) |
918 |
return -1; |
919 |
d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
|
920 |
if (!d)
|
921 |
return AVERROR(ENOMEM);
|
922 |
*s = av_mallocz(sizeof(ByteIOContext));
|
923 |
if(!*s) {
|
924 |
av_free(d); |
925 |
return AVERROR(ENOMEM);
|
926 |
} |
927 |
d->io_buffer_size = io_buffer_size; |
928 |
ret = init_put_byte(*s, d->io_buffer, io_buffer_size, |
929 |
1, d, NULL, |
930 |
max_packet_size ? dyn_packet_buf_write : dyn_buf_write, |
931 |
max_packet_size ? NULL : dyn_buf_seek);
|
932 |
if (ret == 0) { |
933 |
(*s)->max_packet_size = max_packet_size; |
934 |
} else {
|
935 |
av_free(d); |
936 |
av_freep(s); |
937 |
} |
938 |
return ret;
|
939 |
} |
940 |
|
941 |
int url_open_dyn_buf(ByteIOContext **s)
|
942 |
{ |
943 |
return url_open_dyn_buf_internal(s, 0); |
944 |
} |
945 |
|
946 |
int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size) |
947 |
{ |
948 |
if (max_packet_size <= 0) |
949 |
return -1; |
950 |
return url_open_dyn_buf_internal(s, max_packet_size);
|
951 |
} |
952 |
|
953 |
int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
|
954 |
{ |
955 |
DynBuffer *d = s->opaque; |
956 |
int size;
|
957 |
static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0}; |
958 |
int padding = 0; |
959 |
|
960 |
/* don't attempt to pad fixed-size packet buffers */
|
961 |
if (!s->max_packet_size) {
|
962 |
put_buffer(s, padbuf, sizeof(padbuf));
|
963 |
padding = FF_INPUT_BUFFER_PADDING_SIZE; |
964 |
} |
965 |
|
966 |
put_flush_packet(s); |
967 |
|
968 |
*pbuffer = d->buffer; |
969 |
size = d->size; |
970 |
av_free(d); |
971 |
av_free(s); |
972 |
return size - padding;
|
973 |
} |
974 |
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */ |