gstreamer/ext/soundtouch/gstpitch.cc
2010-03-09 18:13:14 +00:00

928 lines
26 KiB
C++

/* GStreamer pitch controller element
* Copyright (C) 2006 Wouter Paesen <wouter@blue-gate.be>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
/* FIXME: workaround for SoundTouch.h of version 1.3.1 defining those
* variables while it shouldn't. */
#undef VERSION
#undef PACKAGE_VERSION
#undef PACKAGE_TARNAME
#undef PACKAGE_STRING
#undef PACKAGE_NAME
#undef PACKAGE_BUGREPORT
#undef PACKAGE
#define FLOAT_SAMPLES 1
#include <soundtouch/SoundTouch.h>
#include <gst/gst.h>
#include <gst/controller/gstcontroller.h>
#include "gstpitch.hh"
#include <math.h>
GST_DEBUG_CATEGORY_STATIC (pitch_debug);
#define GST_CAT_DEFAULT pitch_debug
#define GST_PITCH_GET_PRIVATE(o) (o->priv)
struct _GstPitchPrivate
{
gfloat stream_time_ratio;
GstEvent *pending_segment;
soundtouch::SoundTouch * st;
};
enum
{
ARG_0,
ARG_RATE,
ARG_TEMPO,
ARG_PITCH
};
#define SUPPORTED_CAPS \
GST_STATIC_CAPS( \
"audio/x-raw-float, " \
"rate = (int) [ 8000, MAX ], " \
"channels = (int) [ 1, 2 ], " \
"endianness = (int) BYTE_ORDER, " \
"width = (int) 32" \
)
static GstStaticPadTemplate gst_pitch_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
SUPPORTED_CAPS);
static GstStaticPadTemplate gst_pitch_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
SUPPORTED_CAPS);
static void gst_pitch_dispose (GObject * object);
static void gst_pitch_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_pitch_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static gboolean gst_pitch_sink_setcaps (GstPad * pad, GstCaps * caps);
static GstFlowReturn gst_pitch_chain (GstPad * pad, GstBuffer * buffer);
static GstStateChangeReturn gst_pitch_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_pitch_sink_event (GstPad * pad, GstEvent * event);
static gboolean gst_pitch_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_pitch_src_query (GstPad * pad, GstQuery * query);
static const GstQueryType *gst_pitch_get_query_types (GstPad * pad);
GST_BOILERPLATE (GstPitch, gst_pitch, GstElement, GST_TYPE_ELEMENT);
static void
gst_pitch_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_pitch_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_pitch_sink_template));
gst_element_class_set_details_simple (gstelement_class, "Pitch controller",
"Filter/Converter/Audio", "Control the pitch of an audio stream",
"Wouter Paesen <wouter@blue-gate.be>");
}
static void
gst_pitch_class_init (GstPitchClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
gobject_class = G_OBJECT_CLASS (klass);
element_class = GST_ELEMENT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (pitch_debug, "pitch", 0,
"audio pitch control element");
gobject_class->set_property = gst_pitch_set_property;
gobject_class->get_property = gst_pitch_get_property;
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pitch_dispose);
element_class->change_state = GST_DEBUG_FUNCPTR (gst_pitch_change_state);
g_object_class_install_property (gobject_class, ARG_PITCH,
g_param_spec_float ("pitch", "Pitch",
"Audio stream pitch", 0.1, 10.0, 1.0,
(GParamFlags) (G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE)));
g_object_class_install_property (gobject_class, ARG_TEMPO,
g_param_spec_float ("tempo", "Tempo",
"Audio stream tempo", 0.1, 10.0, 1.0,
(GParamFlags) (G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE)));
g_object_class_install_property (gobject_class, ARG_RATE,
g_param_spec_float ("rate", "Rate",
"Audio stream rate", 0.1, 10.0, 1.0,
(GParamFlags) (G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE)));
g_type_class_add_private (gobject_class, sizeof (GstPitchPrivate));
}
static void
gst_pitch_init (GstPitch * pitch, GstPitchClass * pitch_class)
{
pitch->priv =
G_TYPE_INSTANCE_GET_PRIVATE ((pitch), GST_TYPE_PITCH, GstPitchPrivate);
pitch->sinkpad =
gst_pad_new_from_static_template (&gst_pitch_sink_template, "sink");
gst_pad_set_chain_function (pitch->sinkpad,
GST_DEBUG_FUNCPTR (gst_pitch_chain));
gst_pad_set_event_function (pitch->sinkpad,
GST_DEBUG_FUNCPTR (gst_pitch_sink_event));
gst_pad_set_setcaps_function (pitch->sinkpad,
GST_DEBUG_FUNCPTR (gst_pitch_sink_setcaps));
gst_pad_set_getcaps_function (pitch->sinkpad,
GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
gst_element_add_pad (GST_ELEMENT (pitch), pitch->sinkpad);
pitch->srcpad =
gst_pad_new_from_static_template (&gst_pitch_src_template, "src");
gst_pad_set_event_function (pitch->srcpad,
GST_DEBUG_FUNCPTR (gst_pitch_src_event));
gst_pad_set_query_type_function (pitch->srcpad,
GST_DEBUG_FUNCPTR (gst_pitch_get_query_types));
gst_pad_set_query_function (pitch->srcpad,
GST_DEBUG_FUNCPTR (gst_pitch_src_query));
gst_pad_set_setcaps_function (pitch->srcpad,
GST_DEBUG_FUNCPTR (gst_pitch_sink_setcaps));
gst_pad_set_getcaps_function (pitch->srcpad,
GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
gst_element_add_pad (GST_ELEMENT (pitch), pitch->srcpad);
pitch->priv->st = new soundtouch::SoundTouch ();
pitch->tempo = 1.0;
pitch->rate = 1.0;
pitch->pitch = 1.0;
pitch->next_buffer_time = 0;
pitch->next_buffer_offset = 0;
pitch->priv->st->setRate (pitch->rate);
pitch->priv->st->setTempo (pitch->tempo);
pitch->priv->st->setPitch (pitch->pitch);
pitch->priv->stream_time_ratio = 1.0;
pitch->min_latency = pitch->max_latency = 0;
}
static void
gst_pitch_dispose (GObject * object)
{
GstPitch *pitch = GST_PITCH (object);
if (pitch->priv->st) {
delete pitch->priv->st;
pitch->priv->st = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_pitch_update_duration (GstPitch * pitch)
{
GstMessage *m;
m = gst_message_new_duration (GST_OBJECT (pitch), GST_FORMAT_TIME, -1);
gst_element_post_message (GST_ELEMENT (pitch), m);
}
static void
gst_pitch_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstPitch *pitch = GST_PITCH (object);
GST_OBJECT_LOCK (pitch);
switch (prop_id) {
case ARG_TEMPO:
pitch->tempo = g_value_get_float (value);
pitch->priv->stream_time_ratio = pitch->tempo * pitch->rate;
pitch->priv->st->setTempo (pitch->tempo);
GST_OBJECT_UNLOCK (pitch);
gst_pitch_update_duration (pitch);
break;
case ARG_RATE:
pitch->rate = g_value_get_float (value);
pitch->priv->stream_time_ratio = pitch->tempo * pitch->rate;
pitch->priv->st->setRate (pitch->rate);
GST_OBJECT_UNLOCK (pitch);
gst_pitch_update_duration (pitch);
break;
case ARG_PITCH:
pitch->pitch = g_value_get_float (value);
pitch->priv->st->setPitch (pitch->pitch);
GST_OBJECT_UNLOCK (pitch);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
GST_OBJECT_UNLOCK (pitch);
break;
}
}
static void
gst_pitch_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstPitch *pitch = GST_PITCH (object);
GST_OBJECT_LOCK (pitch);
switch (prop_id) {
case ARG_TEMPO:
g_value_set_float (value, pitch->tempo);
break;
case ARG_RATE:
g_value_set_float (value, pitch->rate);
break;
case ARG_PITCH:
g_value_set_float (value, pitch->pitch);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (pitch);
}
static gboolean
gst_pitch_sink_setcaps (GstPad * pad, GstCaps * caps)
{
GstPitch *pitch;
GstPitchPrivate *priv;
GstStructure *structure;
GstPad *otherpad;
gint rate, channels;
pitch = GST_PITCH (GST_PAD_PARENT (pad));
priv = GST_PITCH_GET_PRIVATE (pitch);
otherpad = (pad == pitch->srcpad) ? pitch->sinkpad : pitch->srcpad;
if (!gst_pad_set_caps (otherpad, caps))
return FALSE;
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (structure, "rate", &rate) ||
!gst_structure_get_int (structure, "channels", &channels)) {
return FALSE;
}
GST_OBJECT_LOCK (pitch);
pitch->samplerate = rate;
pitch->channels = channels;
/* notify the soundtouch instance of this change */
priv->st->setSampleRate (rate);
priv->st->setChannels (channels);
/* calculate sample size */
pitch->sample_size = (sizeof (gfloat) * channels);
GST_OBJECT_UNLOCK (pitch);
return TRUE;
}
/* send a buffer out */
static GstFlowReturn
gst_pitch_forward_buffer (GstPitch * pitch, GstBuffer * buffer)
{
gint samples;
GST_BUFFER_TIMESTAMP (buffer) = pitch->next_buffer_time;
pitch->next_buffer_time += GST_BUFFER_DURATION (buffer);
samples = GST_BUFFER_OFFSET (buffer);
GST_BUFFER_OFFSET (buffer) = pitch->next_buffer_offset;
pitch->next_buffer_offset += samples;
GST_BUFFER_OFFSET_END (buffer) = pitch->next_buffer_offset;
GST_LOG ("pushing buffer [%" GST_TIME_FORMAT "]-[%" GST_TIME_FORMAT
"] (%d samples)", GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
GST_TIME_ARGS (pitch->next_buffer_time), samples);
return gst_pad_push (pitch->srcpad, buffer);
}
/* extract a buffer from soundtouch */
static GstBuffer *
gst_pitch_prepare_buffer (GstPitch * pitch)
{
GstPitchPrivate *priv;
guint samples;
GstBuffer *buffer;
priv = GST_PITCH_GET_PRIVATE (pitch);
GST_LOG_OBJECT (pitch, "preparing buffer");
samples = pitch->priv->st->numSamples ();
if (samples == 0)
return NULL;
if (gst_pad_alloc_buffer_and_set_caps (pitch->srcpad, GST_BUFFER_OFFSET_NONE,
samples * pitch->sample_size, GST_PAD_CAPS (pitch->srcpad), &buffer)
!= GST_FLOW_OK) {
buffer = gst_buffer_new_and_alloc (samples * pitch->sample_size);
gst_buffer_set_caps (buffer, GST_PAD_CAPS (pitch->srcpad));
}
samples =
priv->st->receiveSamples ((gfloat *) GST_BUFFER_DATA (buffer), samples);
if (samples <= 0) {
gst_buffer_unref (buffer);
return NULL;
}
GST_BUFFER_DURATION (buffer) =
gst_util_uint64_scale (samples, GST_SECOND, pitch->samplerate);
/* temporary store samples here, to avoid having to recalculate this */
GST_BUFFER_OFFSET (buffer) = (gint64) samples;
return buffer;
}
/* process the last samples, in a later stage we should make sure no more
* samples are sent out here as strictly necessary, because soundtouch could
* append zero samples, which could disturb looping. */
static GstFlowReturn
gst_pitch_flush_buffer (GstPitch * pitch, gboolean send)
{
GstBuffer *buffer;
GST_DEBUG_OBJECT (pitch, "flushing buffer");
if (pitch->next_buffer_offset == 0)
return GST_FLOW_OK;
pitch->priv->st->flush ();
if (!send)
return GST_FLOW_OK;
buffer = gst_pitch_prepare_buffer (pitch);
if (!buffer)
return GST_FLOW_OK;
return gst_pitch_forward_buffer (pitch, buffer);
}
static gboolean
gst_pitch_src_event (GstPad * pad, GstEvent * event)
{
GstPitch *pitch;
gboolean res;
pitch = GST_PITCH (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (pad, "received %s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:{
/* transform the event upstream, according to the playback rate */
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
gfloat stream_time_ratio;
GST_OBJECT_LOCK (pitch);
stream_time_ratio = pitch->priv->stream_time_ratio;
GST_OBJECT_UNLOCK (pitch);
gst_event_parse_seek (event, &rate, &format, &flags,
&cur_type, &cur, &stop_type, &stop);
gst_event_unref (event);
if (format == GST_FORMAT_TIME || format == GST_FORMAT_DEFAULT) {
cur = (gint64) (cur * stream_time_ratio);
if (stop != -1)
stop = (gint64) (stop * stream_time_ratio);
event = gst_event_new_seek (rate, format, flags,
cur_type, cur, stop_type, stop);
res = gst_pad_event_default (pad, event);
} else {
GST_WARNING_OBJECT (pitch,
"Seeking only supported in TIME or DEFAULT format");
res = FALSE;
}
break;
}
default:
res = gst_pad_event_default (pad, event);
break;
}
gst_object_unref (pitch);
return res;
}
/* generic convert function based on caps, no rate
* used here
*/
static gboolean
gst_pitch_convert (GstPitch * pitch,
GstFormat src_format, gint64 src_value,
GstFormat * dst_format, gint64 * dst_value)
{
gboolean res = TRUE;
guint sample_size;
gint samplerate;
g_return_val_if_fail (dst_format && dst_value, FALSE);
GST_OBJECT_LOCK (pitch);
sample_size = pitch->sample_size;
samplerate = pitch->samplerate;
GST_OBJECT_UNLOCK (pitch);
if (sample_size == 0 || samplerate == 0) {
return FALSE;
}
if (src_format == *dst_format || src_value == -1) {
*dst_value = src_value;
return TRUE;
}
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dst_format) {
case GST_FORMAT_TIME:
*dst_value =
gst_util_uint64_scale_int (src_value, GST_SECOND,
sample_size * samplerate);
break;
case GST_FORMAT_DEFAULT:
*dst_value = gst_util_uint64_scale_int (src_value, 1, sample_size);
break;
default:
res = FALSE;
break;
}
break;
case GST_FORMAT_TIME:
switch (*dst_format) {
case GST_FORMAT_BYTES:
*dst_value =
gst_util_uint64_scale_int (src_value, samplerate * sample_size,
GST_SECOND);
break;
case GST_FORMAT_DEFAULT:
*dst_value =
gst_util_uint64_scale_int (src_value, samplerate, GST_SECOND);
break;
default:
res = FALSE;
break;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dst_format) {
case GST_FORMAT_BYTES:
*dst_value = gst_util_uint64_scale_int (src_value, sample_size, 1);
break;
case GST_FORMAT_TIME:
*dst_value =
gst_util_uint64_scale_int (src_value, GST_SECOND, samplerate);
break;
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
break;
}
return res;
}
static const GstQueryType *
gst_pitch_get_query_types (GstPad * pad)
{
static const GstQueryType types[] = {
GST_QUERY_POSITION,
GST_QUERY_DURATION,
GST_QUERY_CONVERT,
GST_QUERY_LATENCY,
GST_QUERY_NONE
};
return types;
}
static gboolean
gst_pitch_src_query (GstPad * pad, GstQuery * query)
{
GstPitch *pitch;
gboolean res = FALSE;
gfloat stream_time_ratio;
gint64 next_buffer_offset;
GstClockTime next_buffer_time;
pitch = GST_PITCH (gst_pad_get_parent (pad));
GST_LOG ("%s query", GST_QUERY_TYPE_NAME (query));
GST_OBJECT_LOCK (pitch);
stream_time_ratio = pitch->priv->stream_time_ratio;
next_buffer_time = pitch->next_buffer_time;
next_buffer_offset = pitch->next_buffer_offset;
GST_OBJECT_UNLOCK (pitch);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_DURATION:{
GstFormat format;
gint64 duration;
if (!gst_pad_query_default (pad, query)) {
GST_DEBUG_OBJECT (pitch, "upstream provided no duration");
break;
}
gst_query_parse_duration (query, &format, &duration);
if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) {
GST_DEBUG_OBJECT (pitch, "not TIME or DEFAULT format");
break;
}
GST_LOG_OBJECT (pitch, "upstream duration: %" G_GINT64_FORMAT, duration);
duration = (gint64) (duration / stream_time_ratio);
GST_LOG_OBJECT (pitch, "our duration: %" G_GINT64_FORMAT, duration);
gst_query_set_duration (query, format, duration);
res = TRUE;
break;
}
case GST_QUERY_POSITION:{
GstFormat dst_format;
gint64 dst_value;
gst_query_parse_position (query, &dst_format, &dst_value);
if (dst_format != GST_FORMAT_TIME && dst_format != GST_FORMAT_DEFAULT) {
GST_DEBUG_OBJECT (pitch, "not TIME or DEFAULT format");
break;
}
if (dst_format == GST_FORMAT_TIME) {
dst_value = next_buffer_time;
res = TRUE;
} else {
dst_value = next_buffer_offset;
res = TRUE;
}
if (res) {
GST_LOG_OBJECT (pitch, "our position: %" G_GINT64_FORMAT, dst_value);
gst_query_set_position (query, dst_format, dst_value);
}
break;
}
case GST_QUERY_CONVERT:{
GstFormat src_format, dst_format;
gint64 src_value, dst_value;
gst_query_parse_convert (query, &src_format, &src_value,
&dst_format, NULL);
res = gst_pitch_convert (pitch, src_format, src_value,
&dst_format, &dst_value);
if (res) {
gst_query_set_convert (query, src_format, src_value,
dst_format, dst_value);
}
break;
}
case GST_QUERY_LATENCY:
{
GstClockTime min, max;
gboolean live;
GstPad *peer;
if ((peer = gst_pad_get_peer (pitch->sinkpad))) {
if ((res = gst_pad_query (peer, query))) {
gst_query_parse_latency (query, &live, &min, &max);
GST_DEBUG ("Peer latency: min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
GST_TIME_ARGS (min), GST_TIME_ARGS (max));
/* add our own latency */
GST_DEBUG ("Our latency: min %" GST_TIME_FORMAT
", max %" GST_TIME_FORMAT,
GST_TIME_ARGS (pitch->min_latency),
GST_TIME_ARGS (pitch->max_latency));
min += pitch->min_latency;
if (max != GST_CLOCK_TIME_NONE)
max += pitch->max_latency;
else
max = pitch->max_latency;
GST_DEBUG ("Calculated total latency : min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
GST_TIME_ARGS (min), GST_TIME_ARGS (max));
gst_query_set_latency (query, live, min, max);
}
gst_object_unref (peer);
}
break;
}
default:
res = gst_pad_query_default (pad, query);
break;
}
gst_object_unref (pitch);
return res;
}
/* this function returns FALSE if not enough data is known to transform the
* segment into proper downstream values. If the function does return false
* the sgement should be stalled until enough information is available.
* If the funtion returns TRUE, event will be replaced by the new downstream
* compatible event.
*/
static gboolean
gst_pitch_process_segment (GstPitch * pitch, GstEvent ** event)
{
GstFormat format, conv_format;
gint64 start_value, stop_value, base;
gint64 next_offset = 0, next_time = 0;
gboolean update = FALSE;
gdouble rate;
gfloat stream_time_ratio;
g_return_val_if_fail (event, FALSE);
GST_OBJECT_LOCK (pitch);
stream_time_ratio = pitch->priv->stream_time_ratio;
GST_OBJECT_UNLOCK (pitch);
gst_event_parse_new_segment (*event, &update, &rate, &format, &start_value,
&stop_value, &base);
if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) {
GST_WARNING_OBJECT (pitch,
"Only NEWSEGMENT in TIME or DEFAULT format supported, sending"
"open ended NEWSEGMENT in TIME format.");
gst_event_unref (*event);
*event =
gst_event_new_new_segment (update, rate, GST_FORMAT_TIME, 0, -1, 0);
start_value = 0;
stop_value = -1;
base = 0;
}
GST_LOG_OBJECT (pitch->sinkpad,
"segment %" G_GINT64_FORMAT " - %" G_GINT64_FORMAT " (%d)", start_value,
stop_value, format);
if (stream_time_ratio == 0) {
GST_LOG_OBJECT (pitch->sinkpad, "stream_time_ratio is zero");
return FALSE;
}
start_value = (gint64) (start_value / stream_time_ratio);
if (stop_value != -1)
stop_value = (gint64) (stop_value / stream_time_ratio);
base = (gint64) (base / stream_time_ratio);
conv_format = GST_FORMAT_TIME;
if (!gst_pitch_convert (pitch, format, start_value, &conv_format, &next_time)) {
GST_LOG_OBJECT (pitch->sinkpad,
"could not convert segment start value to time");
return FALSE;
}
conv_format = GST_FORMAT_DEFAULT;
if (!gst_pitch_convert (pitch, format, start_value, &conv_format,
&next_offset)) {
GST_LOG_OBJECT (pitch->sinkpad,
"could not convert segment start value to offset");
return FALSE;
}
pitch->next_buffer_time = next_time;
pitch->next_buffer_offset = next_offset;
gst_event_unref (*event);
*event = gst_event_new_new_segment (update, rate, format, start_value,
stop_value, base);
return TRUE;
}
static gboolean
gst_pitch_sink_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
GstPitch *pitch;
pitch = GST_PITCH (gst_pad_get_parent (pad));
GST_LOG_OBJECT (pad, "received %s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
gst_pitch_flush_buffer (pitch, FALSE);
pitch->priv->st->clear ();
pitch->min_latency = pitch->max_latency = 0;
break;
case GST_EVENT_EOS:
gst_pitch_flush_buffer (pitch, TRUE);
pitch->priv->st->clear ();
pitch->min_latency = pitch->max_latency = 0;
break;
case GST_EVENT_NEWSEGMENT:
if (!gst_pitch_process_segment (pitch, &event)) {
GST_LOG_OBJECT (pad, "not enough data known, stalling segment");
if (GST_PITCH_GET_PRIVATE (pitch)->pending_segment)
gst_event_unref (GST_PITCH_GET_PRIVATE (pitch)->pending_segment);
GST_PITCH_GET_PRIVATE (pitch)->pending_segment = event;
event = NULL;
}
pitch->priv->st->clear ();
pitch->min_latency = pitch->max_latency = 0;
break;
default:
break;
}
/* and forward it */
if (event)
res = gst_pad_event_default (pad, event);
gst_object_unref (pitch);
return res;
}
static void
gst_pitch_update_latency (GstPitch * pitch, GstClockTime timestamp)
{
GstClockTimeDiff current_latency, min_latency, max_latency;
current_latency =
(GstClockTimeDiff) (timestamp / pitch->priv->stream_time_ratio) -
pitch->next_buffer_time;
min_latency = MIN (pitch->min_latency, current_latency);
max_latency = MAX (pitch->max_latency, current_latency);
if (pitch->min_latency != min_latency || pitch->max_latency != max_latency) {
pitch->min_latency = min_latency;
pitch->max_latency = max_latency;
/* FIXME: what about the LATENCY event? It only has
* one latency value, should it be current, min or max?
* Should it include upstream latencies?
*/
gst_element_post_message (GST_ELEMENT (pitch),
gst_message_new_latency (GST_OBJECT (pitch)));
}
}
static GstFlowReturn
gst_pitch_chain (GstPad * pad, GstBuffer * buffer)
{
GstPitch *pitch;
GstPitchPrivate *priv;
GstClockTime timestamp;
pitch = GST_PITCH (GST_PAD_PARENT (pad));
priv = GST_PITCH_GET_PRIVATE (pitch);
gst_object_sync_values (G_OBJECT (pitch), pitch->next_buffer_time);
timestamp = GST_BUFFER_TIMESTAMP (buffer);
/* push the received samples on the soundtouch buffer */
GST_LOG_OBJECT (pitch, "incoming buffer (%d samples)",
(gint) (GST_BUFFER_SIZE (buffer) / pitch->sample_size));
if (GST_PITCH_GET_PRIVATE (pitch)->pending_segment) {
GstEvent *event =
gst_event_copy (GST_PITCH_GET_PRIVATE (pitch)->pending_segment);
GST_LOG_OBJECT (pitch, "processing stalled segment");
if (!gst_pitch_process_segment (pitch, &event)) {
gst_event_unref (event);
return GST_FLOW_ERROR;
}
if (!gst_pad_event_default (pitch->sinkpad, event)) {
gst_event_unref (event);
return GST_FLOW_ERROR;
}
gst_event_unref (GST_PITCH_GET_PRIVATE (pitch)->pending_segment);
GST_PITCH_GET_PRIVATE (pitch)->pending_segment = NULL;
}
priv->st->putSamples ((gfloat *) GST_BUFFER_DATA (buffer),
GST_BUFFER_SIZE (buffer) / pitch->sample_size);
gst_buffer_unref (buffer);
/* Calculate latency */
gst_pitch_update_latency (pitch, timestamp);
/* and try to extract some samples from the soundtouch buffer */
if (!priv->st->isEmpty ()) {
GstBuffer *out_buffer;
out_buffer = gst_pitch_prepare_buffer (pitch);
if (out_buffer)
return gst_pitch_forward_buffer (pitch, out_buffer);
}
return GST_FLOW_OK;
}
static GstStateChangeReturn
gst_pitch_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstPitch *pitch = GST_PITCH (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
pitch->next_buffer_time = 0;
pitch->next_buffer_offset = 0;
pitch->priv->st->clear ();
pitch->min_latency = pitch->max_latency = 0;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = parent_class->change_state (element, transition);
if (ret != GST_STATE_CHANGE_SUCCESS)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (GST_PITCH_GET_PRIVATE (pitch)->pending_segment) {
gst_event_unref (GST_PITCH_GET_PRIVATE (pitch)->pending_segment);
GST_PITCH_GET_PRIVATE (pitch)->pending_segment = NULL;
}
break;
case GST_STATE_CHANGE_READY_TO_NULL:
default:
break;
}
return ret;
}