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audiosocket: added support for DTMF frames

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Updated the AudioSocket protocol to allow sending DTMF frames.
AST_FRAME_DTMF frames are now forwarded to the server, in addition to
AST_FRAME_AUDIO frames. A new payload type AST_AUDIOSOCKET_KIND_DTMF
with value 0x03 was added to the protocol. The payload is a 1-byte
ascii representing the DTMF digit (0-9,*,#...).

UserNote: The AudioSocket protocol now forwards DTMF frames with
payload type 0x03. The payload is a 1-byte ascii representing the DTMF
digit (0-9,*,#...).

(cherry picked from commit c44e7e85ec)
This commit is contained in:
Florent CHAUVEAU
2025-02-28 08:47:18 +01:00
committed by Asterisk Development Team
parent 423d2bad16
commit d032df902b
4 changed files with 61 additions and 13 deletions
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26
channels/chan_audiosocket.c
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@@ -59,6 +59,7 @@ static int audiosocket_call(struct ast_channel *ast, const char *dest, int timeo
static int audiosocket_hangup(struct ast_channel *ast);
static struct ast_frame *audiosocket_read(struct ast_channel *ast);
static int audiosocket_write(struct ast_channel *ast, struct ast_frame *f);
static int audiosocket_send_dtmf(struct ast_channel *ast, char digit, unsigned int duration);
/* AudioSocket channel driver declaration */
static struct ast_channel_tech audiosocket_channel_tech = {
@@ -69,6 +70,7 @@ static struct ast_channel_tech audiosocket_channel_tech = {
.hangup = audiosocket_hangup,
.read = audiosocket_read,
.write = audiosocket_write,
.send_digit_end = audiosocket_send_dtmf,
};
/*! \brief Function called when we should read a frame from the channel */
@@ -112,6 +114,30 @@ static int audiosocket_write(struct ast_channel *ast, struct ast_frame *f)
return 0;
}
/*! \brief Function called when we should write a DTMF frame to the channel */
static int audiosocket_send_dtmf(struct ast_channel *ast, char digit, unsigned int duration)
{
struct audiosocket_instance *instance;
struct ast_frame f;
/* The channel should always be present from the API */
instance = ast_channel_tech_pvt(ast);
if (instance == NULL || instance->svc < 1) {
return -1;
}
f.frametype = AST_FRAME_DTMF;
f.subclass.integer = digit;
f.len = duration;
if (ast_audiosocket_send_frame(instance->svc, &f)) {
ast_log(LOG_ERROR, "Failed to forward DTMF frame from channel '%s' to AudioSocket server '%s'\n",
ast_channel_name(ast), instance->server);
return -1;
}
return 0;
}
/*! \brief Function called when we should actually call the destination */
static int audiosocket_call(struct ast_channel *ast, const char *dest, int timeout)
{