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Add functionality to set the direction of a ByteIOContext buffer.

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Patch by Björn Axelsson bjorn axelsson intinor se
Original thread: [FFmpeg-devel] [PATCH] MMS protocol support patch 1
Date: 09/19/2007 05:51 PM

Originally committed as revision 10709 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Björn Axelsson 2007-10-11 14:57:47 +00:00 committed by Benoit Fouet
parent 3ea7841120
commit 770d9dafa1
2 changed files with 23 additions and 9 deletions
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5
libavformat/avio.h
View File

@ -203,6 +203,11 @@ int url_fdopen(ByteIOContext *s, URLContext *h);
/** @warning must be called before any I/O */
int url_setbufsize(ByteIOContext *s, int buf_size);
/** Reset the buffer for reading or writing.
* @note Will drop any data currently in the buffer without transmitting it.
* @param flags URL_RDONLY to set up the buffer for reading, or URL_WRONLY
* to set up the buffer for writing. */
int url_resetbuf(ByteIOContext *s, int flags);
/** @note when opened as read/write, the buffers are only used for
writing */

27
libavformat/aviobuf.c
View File

@ -38,11 +38,7 @@ int init_put_byte(ByteIOContext *s,
s->buffer = buffer;
s->buffer_size = buffer_size;
s->buf_ptr = buffer;
s->write_flag = write_flag;
if (!s->write_flag)
s->buf_end = buffer;
else
s->buf_end = buffer + buffer_size;
url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
s->opaque = opaque;
s->write_packet = write_packet;
s->read_packet = read_packet;
@ -534,10 +530,23 @@ int url_setbufsize(ByteIOContext *s, int buf_size)
s->buffer = buffer;
s->buffer_size = buf_size;
s->buf_ptr = buffer;
if (!s->write_flag)
s->buf_end = buffer;
else
s->buf_end = buffer + buf_size;
url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
return 0;
}
int url_resetbuf(ByteIOContext *s, int flags)
{
URLContext *h = s->opaque;
if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
return AVERROR(EINVAL);
if (flags & URL_WRONLY) {
s->buf_end = s->buffer + s->buffer_size;
s->write_flag = 1;
} else {
s->buf_end = s->buffer;
s->write_flag = 0;
}
return 0;
}