kenmirrors/asterisk
1
0
Fork 0
mirror of https://github.com/asterisk/asterisk.git synced 2025-09-06 12:36:58 +00:00
Code Issues Packages Projects Releases Wiki Activity

add an API call to allow channel drivers to determine which media formats are compatible (passthrough or transcode) with the format an existing channel is already using

Browse Source 
git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@46082 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin P. Fleming
2006-10-24 03:45:42 +00:00
parent eee62843d5
commit d2b10d5f4f
2 changed files with 58 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
include/asterisk/translate.h
View File

@@ -205,12 +205,26 @@ struct ast_frame *ast_translate(struct ast_trans_pvt *tr, struct ast_frame *f, i
/*!
* \brief Returns the number of steps required to convert from 'src' to 'dest'.
* \param dest Destination format
* \param src Source format
* \param dest destination format
* \param src source format
* \return the number of translation steps required, or -1 if no path is available
*/
unsigned int ast_translate_path_steps(unsigned int dest, unsigned int src);
/*!
* \brief Mask off unavailable formats from a format bitmask
* \param dest possible destination formats
* \param src source formats
* \return the destination formats that are available in the source or translatable
*
* The result will include all formats from 'dest' that are either present
* in 'src' or translatable from a format present in 'src'.
*
* Note that only a single audio format and a single video format can be
* present in 'src', or the function will produce unexpected results.
*/
unsigned int ast_translate_available_formats(unsigned int dest, unsigned int src);
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

42
main/translate.c
View File

@@ -777,3 +777,45 @@ unsigned int ast_translate_path_steps(unsigned int dest, unsigned int src)
return tr_matrix[src][dest].multistep + 1;
}
unsigned int ast_translate_available_formats(unsigned int dest, unsigned int src)
{
unsigned int res = dest;
unsigned int x;
unsigned int src_audio = powerof(src & AST_FORMAT_AUDIO_MASK);
unsigned int src_video = powerof(src & AST_FORMAT_VIDEO_MASK);
for (x = 1; x < AST_FORMAT_MAX_AUDIO; x <<= 1) {
/* if this is not a desired format, nothing to do */
if (!dest & x)
continue;
/* if the source is supplying this format, then
we can leave it in the result */
if (src & x)
continue;
/* if we don't have a translation path from the src
to this format, remove it from the result */
if (!tr_matrix[src_audio][powerof(x)].step)
res &= ~x;
}
/* roll over into video formats */
for (; x < AST_FORMAT_MAX_VIDEO; x <<= 1) {
/* if this is not a desired format, nothing to do */
if (!dest & x)
continue;
/* if the source is supplying this format, then
we can leave it in the result */
if (src & x)
continue;
/* if we don't have a translation path from the src
to this format, remove it from the result */
if (!tr_matrix[src_video][powerof(x)].step)
res &= ~x;
}
return res;
}