diff options
Diffstat (limited to 'gst/dtmf')
-rw-r--r-- | gst/dtmf/gstdtmfsrc.c | 196 | ||||
-rw-r--r-- | gst/dtmf/gstdtmfsrc.h | 26 |
2 files changed, 177 insertions, 45 deletions
diff --git a/gst/dtmf/gstdtmfsrc.c b/gst/dtmf/gstdtmfsrc.c index 523419db..0959e6d4 100644 --- a/gst/dtmf/gstdtmfsrc.c +++ b/gst/dtmf/gstdtmfsrc.c @@ -130,6 +130,8 @@ #include <string.h> #include <math.h> +#include <glib.h> + #ifndef M_PI # define M_PI 3.14159265358979323846 /* pi */ #endif @@ -148,7 +150,9 @@ #define MAX_EVENT 16 #define MIN_VOLUME 0 #define MAX_VOLUME 36 - +#define MIN_INTER_DIGIT_INTERVAL 50 +#define MIN_PULSE_DURATION 70 +#define MIN_DUTY_CYCLE (MIN_INTER_DIGIT_INTERVAL + MIN_PULSE_DURATION) typedef struct st_dtmf_key { @@ -265,12 +269,14 @@ static void gst_dtmf_src_get_property (GObject * object, guint prop_id, static gboolean gst_dtmf_src_handle_event (GstPad * pad, GstEvent * event); static GstStateChangeReturn gst_dtmf_src_change_state (GstElement * element, GstStateChange transition); -static void gst_dtmf_src_generate_tone(GstDTMFSrc *dtmfsrc, DTMF_KEY key, float duration, +static void gst_dtmf_src_generate_tone(GstDTMFSrcEvent *event, DTMF_KEY key, float duration, GstBuffer * buffer); static void gst_dtmf_src_push_next_tone_packet (GstDTMFSrc *dtmfsrc); -static void gst_dtmf_src_start (GstDTMFSrc *dtmfsrc, gint event_number, - gint event_volume); +static void gst_dtmf_src_start (GstDTMFSrc *dtmfsrc); static void gst_dtmf_src_stop (GstDTMFSrc *dtmfsrc); +static void gst_dtmf_src_add_start_event (GstDTMFSrc *dtmfsrc, gint event_number, + gint event_volume); +static void gst_dtmf_src_add_stop_event (GstDTMFSrc *dtmfsrc); static void gst_dtmf_src_base_init (gpointer g_class) @@ -324,7 +330,8 @@ gst_dtmf_src_init (GstDTMFSrc * dtmfsrc, gpointer g_class) dtmfsrc->interval = DEFAULT_PACKET_INTERVAL; - dtmfsrc->sample = 0; + dtmfsrc->event_queue = g_async_queue_new (); + dtmfsrc->last_event = NULL; GST_DEBUG_OBJECT (dtmfsrc, "init done"); } @@ -336,6 +343,14 @@ gst_dtmf_src_finalize (GObject * object) dtmfsrc = GST_DTMF_SRC (object); + + gst_dtmf_src_stop (dtmfsrc); + + if (dtmfsrc->event_queue) { + g_async_queue_unref (dtmfsrc->event_queue); + dtmfsrc->event_queue = NULL; + } + G_OBJECT_CLASS (parent_class)->finalize (object); } @@ -368,12 +383,12 @@ gst_dtmf_src_handle_dtmf_event (GstDTMFSrc *dtmfsrc, GST_DEBUG_OBJECT (dtmfsrc, "Received start event %d with volume %d", event_number, event_volume); - gst_dtmf_src_start (dtmfsrc, event_number, event_volume); + gst_dtmf_src_add_start_event (dtmfsrc, event_number, event_volume); } else { GST_DEBUG_OBJECT (dtmfsrc, "Received stop event"); - gst_dtmf_src_stop (dtmfsrc); + gst_dtmf_src_add_stop_event (dtmfsrc); } return TRUE; @@ -498,35 +513,26 @@ gst_dtmf_src_set_stream_lock (GstDTMFSrc *dtmfsrc, gboolean lock) } static void -gst_dtmf_prepare_timestamps (GstDTMFSrc *dtmfsrc) +gst_dtmf_prepare_timestamps (GstDTMFSrc *dtmfsrc, GstDTMFSrcEvent *event) { GstClock *clock; clock = GST_ELEMENT_CLOCK (dtmfsrc); if (clock != NULL) - dtmfsrc->timestamp = gst_clock_get_time (GST_ELEMENT_CLOCK (dtmfsrc)); + event->timestamp = gst_clock_get_time (GST_ELEMENT_CLOCK (dtmfsrc)); else { GST_ERROR_OBJECT (dtmfsrc, "No clock set for element %s", GST_ELEMENT_NAME (dtmfsrc)); - dtmfsrc->timestamp = GST_CLOCK_TIME_NONE; + event->timestamp = GST_CLOCK_TIME_NONE; } } static void -gst_dtmf_src_start (GstDTMFSrc *dtmfsrc, - gint event_number, gint event_volume) +gst_dtmf_src_start (GstDTMFSrc *dtmfsrc) { GstCaps * caps = gst_pad_get_pad_template_caps (dtmfsrc->srcpad); - dtmfsrc->event = CLAMP (event_number, MIN_EVENT, MAX_EVENT); - dtmfsrc->volume = CLAMP (event_volume, MIN_VOLUME, MAX_VOLUME); - - gst_dtmf_prepare_timestamps (dtmfsrc); - - /* Don't forget to get exclusive access to the stream */ - gst_dtmf_src_set_stream_lock (dtmfsrc, TRUE); - if (!gst_pad_set_caps (dtmfsrc->srcpad, caps)) GST_ERROR_OBJECT (dtmfsrc, "Failed to set caps %" GST_PTR_FORMAT " on src pad", caps); @@ -547,6 +553,20 @@ gst_dtmf_src_stop (GstDTMFSrc *dtmfsrc) /* Don't forget to release the stream lock */ gst_dtmf_src_set_stream_lock (dtmfsrc, FALSE); + + /* Flushing the event queue */ + GstDTMFSrcEvent *event = g_async_queue_try_pop (dtmfsrc->event_queue); + + while (event != NULL) { + g_free (event); + event = g_async_queue_try_pop (dtmfsrc->event_queue); + } + + if (dtmfsrc->last_event) { + g_free (dtmfsrc->last_event); + dtmfsrc->last_event = NULL; + } + if (!gst_pad_pause_task (dtmfsrc->srcpad)) { GST_ERROR_OBJECT (dtmfsrc, "Failed to pause task on src pad"); return; @@ -555,7 +575,47 @@ gst_dtmf_src_stop (GstDTMFSrc *dtmfsrc) } static void -gst_dtmf_src_generate_tone(GstDTMFSrc *dtmfsrc, DTMF_KEY key, float duration, GstBuffer * buffer) +gst_dtmf_src_add_start_event (GstDTMFSrc *dtmfsrc, gint event_number, + gint event_volume) +{ + + GstDTMFSrcEvent * event = g_malloc (sizeof(GstDTMFSrcEvent)); + event->event_type = DTMF_EVENT_TYPE_START; + event->sample = 0; + event->event_number = CLAMP (event_number, MIN_EVENT, MAX_EVENT); + event->volume = CLAMP (event_volume, MIN_VOLUME, MAX_VOLUME); + + g_async_queue_push (dtmfsrc->event_queue, event); +} + +static void +gst_dtmf_src_add_stop_event (GstDTMFSrc *dtmfsrc) +{ + + GstDTMFSrcEvent * event = g_malloc (sizeof(GstDTMFSrcEvent)); + event->event_type = DTMF_EVENT_TYPE_STOP; + event->sample = 0; + event->event_number = 0; + event->volume = 0; + + g_async_queue_push (dtmfsrc->event_queue, event); +} + +static void +gst_dtmf_src_generate_silence(GstBuffer * buffer, float duration) +{ + gint buf_size; + + /* Create a buffer with data set to 0 */ + buf_size = ((duration/1000)*SAMPLE_RATE*SAMPLE_SIZE*CHANNELS)/8; + GST_BUFFER_SIZE (buffer) = buf_size; + GST_BUFFER_MALLOCDATA (buffer) = g_malloc0(buf_size); + GST_BUFFER_DATA (buffer) = GST_BUFFER_MALLOCDATA (buffer); + +} + +static void +gst_dtmf_src_generate_tone(GstDTMFSrcEvent *event, DTMF_KEY key, float duration, GstBuffer * buffer) { gint16 *p; gint tone_size; @@ -578,8 +638,8 @@ gst_dtmf_src_generate_tone(GstDTMFSrc *dtmfsrc, DTMF_KEY key, float duration, Gs /* * We add the fundamental frequencies together. */ - f1 = sin(2 * M_PI * key.low_frequency * (dtmfsrc->sample / SAMPLE_RATE)); - f2 = sin(2 * M_PI * key.high_frequency * (dtmfsrc->sample / SAMPLE_RATE)); + f1 = sin(2 * M_PI * key.low_frequency * (event->sample / SAMPLE_RATE)); + f2 = sin(2 * M_PI * key.high_frequency * (event->sample / SAMPLE_RATE)); amplitude = (f1 + f2) / 2; @@ -589,7 +649,7 @@ gst_dtmf_src_generate_tone(GstDTMFSrc *dtmfsrc, DTMF_KEY key, float duration, Gs /* Store it in the data buffer */ *(p++) = (gint16) amplitude; - (dtmfsrc->sample)++; + (event->sample)++; } } @@ -620,9 +680,10 @@ gst_dtmf_src_wait_for_buffer_ts (GstDTMFSrc *dtmfsrc, GstBuffer * buf) static GstBuffer * -gst_dtmf_src_create_next_tone_packet (GstDTMFSrc *dtmfsrc) +gst_dtmf_src_create_next_tone_packet (GstDTMFSrc *dtmfsrc, GstDTMFSrcEvent *event) { GstBuffer *buf = NULL; + guint32 duration; GST_DEBUG_OBJECT (dtmfsrc, @@ -631,14 +692,32 @@ gst_dtmf_src_create_next_tone_packet (GstDTMFSrc *dtmfsrc) /* create buffer to hold the tone */ buf = gst_buffer_new (); - /* Generate the tone */ - gst_dtmf_src_generate_tone(dtmfsrc, DTMF_KEYS[dtmfsrc->event], dtmfsrc->interval, buf); + /* The first packet must be inter digit silence, then the second and third must be the + * minimal pulse duration divided into two packets to make it small + */ + switch(event->packet_count) { + case 0: + duration = MIN_INTER_DIGIT_INTERVAL; + gst_dtmf_src_generate_silence (buf, duration); + break; + case 1: + case 2: + /* Generate the tone */ + duration = MIN_PULSE_DURATION / 2; + gst_dtmf_src_generate_tone(event, DTMF_KEYS[event->event_number], duration, buf); + break; + default: + duration = dtmfsrc->interval; + gst_dtmf_src_generate_tone(event, DTMF_KEYS[event->event_number], duration, buf); + break; + } + event->packet_count++; /* timestamp and duration of GstBuffer */ - GST_BUFFER_DURATION (buf) = dtmfsrc->interval * GST_MSECOND; - GST_BUFFER_TIMESTAMP (buf) = dtmfsrc->timestamp; - dtmfsrc->timestamp += GST_BUFFER_DURATION (buf) /2; + GST_BUFFER_DURATION (buf) = duration * GST_MSECOND; + GST_BUFFER_TIMESTAMP (buf) = event->timestamp; + event->timestamp += GST_BUFFER_DURATION (buf); /* FIXME: Should we sync to clock ourselves or leave it to sink */ gst_dtmf_src_wait_for_buffer_ts (dtmfsrc, buf); @@ -654,20 +733,54 @@ gst_dtmf_src_push_next_tone_packet (GstDTMFSrc *dtmfsrc) { GstBuffer *buf = NULL; GstFlowReturn ret; + GstDTMFSrcEvent *event; - buf = gst_dtmf_src_create_next_tone_packet (dtmfsrc); + g_async_queue_ref (dtmfsrc->event_queue); - gst_buffer_ref(buf); + if (dtmfsrc->last_event == NULL) { + event = g_async_queue_pop (dtmfsrc->event_queue); - GST_DEBUG_OBJECT (dtmfsrc, - "pushing buffer on src pad of size %d", GST_BUFFER_SIZE (buf)); - ret = gst_pad_push (dtmfsrc->srcpad, buf); - if (ret != GST_FLOW_OK) { - GST_ERROR_OBJECT (dtmfsrc, "Failed to push buffer on src pad", GST_BUFFER_SIZE (buf)); + if (event->event_type == DTMF_EVENT_TYPE_STOP) { + GST_WARNING_OBJECT (dtmfsrc, "Received a DTMF stop event when already stopped", GST_BUFFER_SIZE (buf)); + } else if (event->event_type == DTMF_EVENT_TYPE_START) { + gst_dtmf_prepare_timestamps (dtmfsrc, event); + + /* Don't forget to get exclusive access to the stream */ + gst_dtmf_src_set_stream_lock (dtmfsrc, TRUE); + + event->packet_count = 0; + dtmfsrc->last_event = event; + } + } else if (dtmfsrc->last_event->packet_count >= 3) { + event = g_async_queue_try_pop (dtmfsrc->event_queue); + + if (event != NULL) { + if (event->event_type == DTMF_EVENT_TYPE_START) { + GST_WARNING_OBJECT (dtmfsrc, "Received two consecutive DTMF start events", GST_BUFFER_SIZE (buf)); + } else if (event->event_type == DTMF_EVENT_TYPE_STOP) { + gst_dtmf_src_set_stream_lock (dtmfsrc, FALSE); + g_free (dtmfsrc->last_event); + dtmfsrc->last_event = NULL; + } + } } + g_async_queue_unref (dtmfsrc->event_queue); + + if (dtmfsrc->last_event) { + buf = gst_dtmf_src_create_next_tone_packet (dtmfsrc, dtmfsrc->last_event); - gst_buffer_unref(buf); - GST_DEBUG_OBJECT (dtmfsrc, "pushed DTMF tone on src pad"); + gst_buffer_ref(buf); + + GST_DEBUG_OBJECT (dtmfsrc, + "pushing buffer on src pad of size %d", GST_BUFFER_SIZE (buf)); + ret = gst_pad_push (dtmfsrc->srcpad, buf); + if (ret != GST_FLOW_OK) { + GST_ERROR_OBJECT (dtmfsrc, "Failed to push buffer on src pad", GST_BUFFER_SIZE (buf)); + } + + gst_buffer_unref(buf); + GST_DEBUG_OBJECT (dtmfsrc, "pushed DTMF tone on src pad"); + } } @@ -687,7 +800,7 @@ gst_dtmf_src_change_state (GstElement * element, GstStateChange transition) no_preroll = TRUE; break; case GST_STATE_CHANGE_PAUSED_TO_PLAYING: - /* gst_dtmf_src_start (dtmfsrc, 6, 30); */ + gst_dtmf_src_start (dtmfsrc); break; default: break; @@ -701,7 +814,7 @@ gst_dtmf_src_change_state (GstElement * element, GstStateChange transition) switch (transition) { case GST_STATE_CHANGE_PLAYING_TO_PAUSED: /* Indicate that we don't do PRE_ROLL */ - /* gst_dtmf_src_stop (dtmfsrc); */ + gst_dtmf_src_stop (dtmfsrc); no_preroll = TRUE; break; default: @@ -727,3 +840,4 @@ gst_dtmf_src_plugin_init (GstPlugin * plugin) return gst_element_register (plugin, "dtmfsrc", GST_RANK_NONE, GST_TYPE_DTMF_SRC); } + diff --git a/gst/dtmf/gstdtmfsrc.h b/gst/dtmf/gstdtmfsrc.h index 234120e9..544b66e5 100644 --- a/gst/dtmf/gstdtmfsrc.h +++ b/gst/dtmf/gstdtmfsrc.h @@ -49,18 +49,36 @@ typedef struct _GstDTMFSrcClass GstDTMFSrcClass; * * The opaque #GstDTMFSrc data structure. */ + +enum _GstDTMFEventType { + DTMF_EVENT_TYPE_START, + DTMF_EVENT_TYPE_STOP +}; + +typedef enum _GstDTMFEventType GstDTMFEventType; + +struct _GstDTMFSrcEvent { + GstClockTime timestamp; + GstDTMFEventType event_type; + double sample; + guint16 event_number; + guint16 volume; + guint32 packet_count; +}; + +typedef struct _GstDTMFSrcEvent GstDTMFSrcEvent; + struct _GstDTMFSrc { GstElement element; GstPad *srcpad; - GstClockTime timestamp; GstSegment segment; - double sample; + GAsyncQueue* event_queue; + GstDTMFSrcEvent* last_event; - guint16 event; - guint16 volume; guint16 interval; }; + struct _GstDTMFSrcClass { GstElementClass parent_class; }; |