mirror of
https://git.ffmpeg.org/ffmpeg.git
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416 lines
9.4 KiB
C
416 lines
9.4 KiB
C
/*
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* Buffered I/O for ffmpeg system
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* Copyright (c) 2000,2001 Gerard Lantau
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "avformat.h"
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#define IO_BUFFER_SIZE 32768
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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 *buf, int buf_size),
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void (*write_packet)(void *opaque, UINT8 *buf, int buf_size),
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int (*seek)(void *opaque, offset_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->write_flag = write_flag;
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if (!s->write_flag)
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s->buf_end = buffer;
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else
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s->buf_end = buffer + buffer_size;
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s->opaque = opaque;
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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->is_streamed = 0;
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s->packet_size = 1;
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return 0;
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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)
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s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
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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_buffer(ByteIOContext *s, unsigned char *buf, int size)
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{
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int len;
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while (size > 0) {
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len = (s->buf_end - s->buf_ptr);
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if (len > size)
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len = 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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offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
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{
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offset_t offset1;
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if (whence != SEEK_CUR && whence != SEEK_SET)
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return -EINVAL;
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if (s->write_flag) {
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if (whence == SEEK_CUR) {
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offset1 = s->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 - s->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 {
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if (!s->seek)
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return -EPIPE;
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flush_buffer(s);
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s->must_flush = 1;
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s->buf_ptr = s->buffer;
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s->seek(s->opaque, offset, SEEK_SET);
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s->pos = offset;
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}
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} else {
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if (whence == SEEK_CUR) {
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offset1 = s->pos - (s->buf_end - s->buffer) + (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 - (s->pos - (s->buf_end - s->buffer));
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if (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 {
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if (!s->seek)
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return -EPIPE;
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s->buf_ptr = s->buffer;
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s->buf_end = s->buffer;
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s->eof_reached = 0;
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s->seek(s->opaque, offset, SEEK_SET);
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s->pos = offset;
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}
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}
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return offset;
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}
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void url_fskip(ByteIOContext *s, offset_t offset)
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{
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url_fseek(s, offset, SEEK_CUR);
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}
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offset_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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int url_feof(ByteIOContext *s)
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{
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return s->eof_reached;
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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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void put_le64(ByteIOContext *s, UINT64 val)
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{
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put_le32(s, (UINT32)(val & 0xffffffff));
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put_le32(s, (UINT32)(val >> 32));
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}
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void put_be64(ByteIOContext *s, UINT64 val)
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{
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put_be32(s, (UINT32)(val >> 32));
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put_be32(s, (UINT32)(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_tag(ByteIOContext *s, 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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int len;
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len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
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s->pos += len;
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s->buf_ptr = s->buffer;
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s->buf_end = s->buffer + len;
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if (len == 0) {
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s->eof_reached = 1;
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}
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}
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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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return *s->buf_ptr++;
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} else {
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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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else
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return 0;
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}
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}
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int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
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{
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int len, size1;
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size1 = size;
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while (size > 0) {
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len = s->buf_end - s->buf_ptr;
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if (len > size)
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len = size;
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if (len == 0) {
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fill_buffer(s);
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len = s->buf_end - s->buf_ptr;
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if (len == 0)
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break;
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} else {
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memcpy(buf, s->buf_ptr, len);
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buf += len;
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s->buf_ptr += len;
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size -= len;
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}
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}
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return size1 - size;
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}
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unsigned int get_le16(ByteIOContext *s)
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{
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unsigned int val;
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val = get_byte(s);
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val |= get_byte(s) << 8;
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return val;
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}
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unsigned int get_le32(ByteIOContext *s)
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{
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unsigned int val;
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val = get_byte(s);
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val |= get_byte(s) << 8;
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val |= get_byte(s) << 16;
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val |= get_byte(s) << 24;
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return val;
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}
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UINT64 get_le64(ByteIOContext *s)
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{
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UINT64 val;
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val = (UINT64)get_le32(s);
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val |= (UINT64)get_le32(s) << 32;
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return val;
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}
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unsigned int get_be16(ByteIOContext *s)
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{
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unsigned int val;
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val = get_byte(s) << 8;
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val |= get_byte(s);
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return val;
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}
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unsigned int get_be32(ByteIOContext *s)
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{
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unsigned int val;
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val = get_byte(s) << 24;
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val |= get_byte(s) << 16;
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val |= get_byte(s) << 8;
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val |= get_byte(s);
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return val;
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}
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UINT64 get_be64(ByteIOContext *s)
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{
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UINT64 val;
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val = (UINT64)get_be32(s) << 32;
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val |= (UINT64)get_be32(s);
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return val;
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}
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/* link with avio functions */
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void url_write_packet(void *opaque, UINT8 *buf, int buf_size)
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{
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URLContext *h = opaque;
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url_write(h, buf, buf_size);
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}
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int url_read_packet(void *opaque, UINT8 *buf, int buf_size)
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{
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URLContext *h = opaque;
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return url_read(h, buf, buf_size);
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}
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int url_seek_packet(void *opaque, INT64 offset, int whence)
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{
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URLContext *h = opaque;
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url_seek(h, offset, whence);
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return 0;
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}
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int url_fdopen(ByteIOContext *s, URLContext *h)
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{
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UINT8 *buffer;
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int buffer_size;
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buffer_size = (IO_BUFFER_SIZE / h->packet_size) * h->packet_size;
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buffer = malloc(buffer_size);
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if (!buffer)
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return -ENOMEM;
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if (init_put_byte(s, buffer, buffer_size,
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(h->flags & URL_WRONLY) != 0, h,
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url_read_packet, url_write_packet, url_seek_packet) < 0) {
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free(buffer);
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return -EIO;
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}
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s->is_streamed = h->is_streamed;
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s->packet_size = h->packet_size;
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return 0;
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}
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/* XXX: must be called before any I/O */
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int url_setbufsize(ByteIOContext *s, int buf_size)
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{
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UINT8 *buffer;
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buffer = malloc(buf_size);
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if (!buffer)
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return -ENOMEM;
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free(s->buffer);
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s->buffer = buffer;
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s->buffer_size = buf_size;
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s->buf_ptr = buffer;
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if (!s->write_flag)
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s->buf_end = buffer;
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else
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s->buf_end = buffer + buf_size;
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return 0;
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}
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int url_fopen(ByteIOContext *s, const char *filename, int flags)
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{
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URLContext *h;
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int err;
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err = url_open(&h, filename, flags);
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if (err < 0)
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return err;
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err = url_fdopen(s, h);
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if (err < 0) {
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url_close(h);
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return err;
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}
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return 0;
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}
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int url_fclose(ByteIOContext *s)
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{
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URLContext *h = s->opaque;
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free(s->buffer);
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memset(s, 0, sizeof(ByteIOContext));
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return url_close(h);
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}
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URLContext *url_fileno(ByteIOContext *s)
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{
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return s->opaque;
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}
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/* buffer handling */
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int url_open_buf(ByteIOContext *s, UINT8 *buf, int buf_size, int flags)
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{
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return init_put_byte(s, buf, buf_size,
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(flags & URL_WRONLY) != 0, NULL, NULL, NULL, NULL);
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}
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/* return the written or read size */
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int url_close_buf(ByteIOContext *s)
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{
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return s->buf_ptr - s->buffer;
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}
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