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audiohook: add directional awareness

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Add enum to allow setting optional direction. If set to only one
direction, only feed matching-direction frames to the associated
slin factory.

This prevents mangling the transcoder on non-mixed frames when the
READ and WRITE frames would have otherwise required it.  Also
removes the need to mute or discard the un-wanted frames as they
are no longer added in the first place.

res_stasis_snoop is changed to use this addition to set direction
on audiohook based on spy direction.

If no direction is set, the ast_audiohook_init will init this enum
to BOTH which maintains existing functionality.

ASTERISK-30252

Change-Id: If8716bad334562a5d812be4eeb2a92e4f3be28eb
This commit is contained in:
Mike Bradeen
2022-09-29 14:55:20 -06:00
committed by Friendly Automation
parent b397dc3ca3
commit f61dbd566b
3 changed files with 40 additions and 13 deletions
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22
main/audiohook.c
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@@ -109,6 +109,9 @@ int ast_audiohook_init(struct ast_audiohook *audiohook, enum ast_audiohook_type
audiohook->init_flags = init_flags;
/* Set direction to BOTH so that we feed frames in both directions */
audiohook->direction = AST_AUDIOHOOK_DIRECTION_BOTH;
/* initialize internal rate at 8khz, this will adjust if necessary */
audiohook_set_internal_rate(audiohook, DEFAULT_INTERNAL_SAMPLE_RATE, 0);
@@ -144,6 +147,18 @@ int ast_audiohook_destroy(struct ast_audiohook *audiohook)
return 0;
}
int ast_audiohook_set_frame_feed_direction(struct ast_audiohook *audiohook, enum ast_audiohook_direction direction)
{
/* Only set the direction on new audiohooks */
if (audiohook->status != AST_AUDIOHOOK_STATUS_NEW) {
ast_debug(3, "Can not set direction on attached Audiohook %p\n", audiohook);
return -1;
}
audiohook->direction = direction;
return 0;
}
#define SHOULD_MUTE(hook, dir) \
((ast_test_flag(hook, AST_AUDIOHOOK_MUTE_READ) && (dir == AST_AUDIOHOOK_DIRECTION_READ)) || \
(ast_test_flag(hook, AST_AUDIOHOOK_MUTE_WRITE) && (dir == AST_AUDIOHOOK_DIRECTION_WRITE)) || \
@@ -159,6 +174,13 @@ int ast_audiohook_write_frame(struct ast_audiohook *audiohook, enum ast_audiohoo
int other_factory_samples;
int other_factory_ms;
/* Don't feed the frame if we are set to read and this is a write frame or if set to
write and this is a read frame as we don't want it. Plus, it can cause mis-resampling
if the READ and WRITE frames have different bitrates */
if (audiohook->direction != AST_AUDIOHOOK_DIRECTION_BOTH && audiohook->direction != direction) {
return 0;
}
/* Update last feeding time to be current */
*rwtime = ast_tvnow();