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Change avf_sdp_create() to get a pre-allocated buffer as input, and to

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return an integer (0 if the SDP has been succesfully created, < 0 in case
of error)

Originally committed as revision 9947 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Luca Abeni 2007-08-05 13:44:56 +00:00
parent fe4ff07aa0
commit 8767b80f5f
2 changed files with 13 additions and 19 deletions
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11
libavformat/avformat.h
View File

@ -842,12 +842,13 @@ int av_filename_number_test(const char *filename);
* multiple AVStreams (one AVStream per RTP stream). Otherwise,
* all the contexts in the array (an AVCodecContext per RTP stream)
* must contain only one AVStream
* @param n_streams number of AVCodecContexts contained in ac
* @return a pointer to the SDP (an array of chars which is allocated by
* avf_sdp_create(), and must be freed by the caller), or NULL in
* case of failure.
* @param n_files number of AVCodecContexts contained in ac
* @param buff buffer where the SDP will be stored (must be allocated by
* the caller
* @param size the size of the buffer
* @return 0 if OK. AVERROR_xxx if error.
*/
char *avf_sdp_create(AVFormatContext *ac[], int n_streams);
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
#ifdef HAVE_AV_CONFIG_H

21
libavformat/sdp.c
View File

@ -169,19 +169,12 @@ static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char
sdp_media_attributes(buff, size, c, payload_type);
}
#define SDP_BUFFER_SIZE 2048
char *avf_sdp_create(AVFormatContext *ac[], int n_files)
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
{
char *buff;
struct sdp_session_level s;
int i, j, port, ttl;
char dst[32];
buff = av_mallocz(SDP_BUFFER_SIZE);
if (buff == NULL) {
return NULL;
}
memset(&s, 0, sizeof(struct sdp_session_level));
s.user = "-";
s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
@ -196,7 +189,7 @@ char *avf_sdp_create(AVFormatContext *ac[], int n_files)
s.ttl = ttl;
}
}
sdp_write_header(buff, SDP_BUFFER_SIZE, &s);
sdp_write_header(buff, size, &s);
dst[0] = 0;
for (i = 0; i < n_files; i++) {
@ -204,21 +197,21 @@ char *avf_sdp_create(AVFormatContext *ac[], int n_files)
port = get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
}
for (j = 0; j < ac[i]->nb_streams; j++) {
sdp_write_media(buff, SDP_BUFFER_SIZE,
sdp_write_media(buff, size,
ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
(port > 0) ? port + j * 2 : 0, ttl);
if (port <= 0) {
av_strlcatf(buff, SDP_BUFFER_SIZE,
av_strlcatf(buff, size,
"a=control:streamid=%d\r\n", i + j);
}
}
}
return buff;
return 0;
}
#else
char *avf_sdp_create(AVFormatContext *ac[], int n_files)
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
{
return NULL;
return AVERROR(ENOSYS);
}
#endif