blob: fd3f8091f94171a565a4098d3ea2ef4160c81fbb [file] [log] [blame]
/*
* GStreamer
* Copyright (C) 2016 Sebastian Dröge <sebastian@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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
#include "gstaudiobuffersplit.h"
#define GST_CAT_DEFAULT gst_audio_buffer_split_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw")
);
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw")
);
enum
{
PROP_0,
PROP_OUTPUT_BUFFER_DURATION,
PROP_ALIGNMENT_THRESHOLD,
PROP_DISCONT_WAIT,
PROP_STRICT_BUFFER_SIZE,
LAST_PROP
};
#define DEFAULT_OUTPUT_BUFFER_DURATION_N (1)
#define DEFAULT_OUTPUT_BUFFER_DURATION_D (50)
#define DEFAULT_ALIGNMENT_THRESHOLD (40 * GST_MSECOND)
#define DEFAULT_DISCONT_WAIT (1 * GST_SECOND)
#define DEFAULT_STRICT_BUFFER_SIZE (FALSE)
#define parent_class gst_audio_buffer_split_parent_class
G_DEFINE_TYPE (GstAudioBufferSplit, gst_audio_buffer_split, GST_TYPE_ELEMENT);
static GstFlowReturn gst_audio_buffer_split_sink_chain (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static gboolean gst_audio_buffer_split_sink_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_audio_buffer_split_src_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static void gst_audio_buffer_split_finalize (GObject * object);
static void gst_audio_buffer_split_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static void gst_audio_buffer_split_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec);
static GstStateChangeReturn gst_audio_buffer_split_change_state (GstElement *
element, GstStateChange transition);
static void
gst_audio_buffer_split_class_init (GstAudioBufferSplitClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
gobject_class->set_property = gst_audio_buffer_split_set_property;
gobject_class->get_property = gst_audio_buffer_split_get_property;
gobject_class->finalize = gst_audio_buffer_split_finalize;
g_object_class_install_property (gobject_class, PROP_OUTPUT_BUFFER_DURATION,
gst_param_spec_fraction ("output-buffer-duration",
"Output Buffer Duration", "Output block size in seconds", 1, G_MAXINT,
G_MAXINT, 1, DEFAULT_OUTPUT_BUFFER_DURATION_N,
DEFAULT_OUTPUT_BUFFER_DURATION_D,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
g_object_class_install_property (gobject_class, PROP_ALIGNMENT_THRESHOLD,
g_param_spec_uint64 ("alignment-threshold", "Alignment Threshold",
"Timestamp alignment threshold in nanoseconds", 0,
G_MAXUINT64 - 1, DEFAULT_ALIGNMENT_THRESHOLD,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
g_object_class_install_property (gobject_class, PROP_DISCONT_WAIT,
g_param_spec_uint64 ("discont-wait", "Discont Wait",
"Window of time in nanoseconds to wait before "
"creating a discontinuity", 0,
G_MAXUINT64 - 1, DEFAULT_DISCONT_WAIT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
g_object_class_install_property (gobject_class, PROP_STRICT_BUFFER_SIZE,
g_param_spec_boolean ("strict-buffer-size", "Strict buffer size",
"Discard the last samples at EOS or discont if they are too "
"small to fill a buffer", DEFAULT_STRICT_BUFFER_SIZE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
gst_element_class_set_static_metadata (gstelement_class,
"Audio Buffer Split", "Audio/Filter",
"Splits raw audio buffers into equal sized chunks",
"Sebastian Dröge <sebastian@centricular.com>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sink_template));
gstelement_class->change_state = gst_audio_buffer_split_change_state;
}
static void
gst_audio_buffer_split_init (GstAudioBufferSplit * self)
{
self->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_chain_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_audio_buffer_split_sink_chain));
gst_pad_set_event_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_audio_buffer_split_sink_event));
GST_PAD_SET_PROXY_CAPS (self->sinkpad);
gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
self->srcpad = gst_pad_new_from_static_template (&src_template, "src");
gst_pad_set_query_function (self->srcpad,
GST_DEBUG_FUNCPTR (gst_audio_buffer_split_src_query));
GST_PAD_SET_PROXY_CAPS (self->srcpad);
gst_pad_use_fixed_caps (self->srcpad);
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
self->output_buffer_duration_n = DEFAULT_OUTPUT_BUFFER_DURATION_N;
self->output_buffer_duration_d = DEFAULT_OUTPUT_BUFFER_DURATION_D;
self->strict_buffer_size = DEFAULT_STRICT_BUFFER_SIZE;
self->adapter = gst_adapter_new ();
self->stream_align =
gst_audio_stream_align_new (48000, DEFAULT_ALIGNMENT_THRESHOLD,
DEFAULT_DISCONT_WAIT);
}
static void
gst_audio_buffer_split_finalize (GObject * object)
{
GstAudioBufferSplit *self = GST_AUDIO_BUFFER_SPLIT (object);
if (self->adapter) {
gst_object_unref (self->adapter);
self->adapter = NULL;
}
if (self->stream_align) {
gst_audio_stream_align_free (self->stream_align);
self->stream_align = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_audio_buffer_split_update_samples_per_buffer (GstAudioBufferSplit * self)
{
gboolean ret = TRUE;
GST_OBJECT_LOCK (self);
/* For a later time */
if (!self->info.finfo
|| GST_AUDIO_INFO_FORMAT (&self->info) == GST_AUDIO_FORMAT_UNKNOWN) {
self->samples_per_buffer = 0;
goto out;
}
self->samples_per_buffer =
(((guint64) GST_AUDIO_INFO_RATE (&self->info)) *
self->output_buffer_duration_n) / self->output_buffer_duration_d;
if (self->samples_per_buffer == 0) {
ret = FALSE;
goto out;
}
self->error_per_buffer =
(((guint64) GST_AUDIO_INFO_RATE (&self->info)) *
self->output_buffer_duration_n) % self->output_buffer_duration_d;
self->accumulated_error = 0;
GST_DEBUG_OBJECT (self, "Buffer duration: %u/%u",
self->output_buffer_duration_n, self->output_buffer_duration_d);
GST_DEBUG_OBJECT (self, "Samples per buffer: %u (error: %u/%u)",
self->samples_per_buffer, self->error_per_buffer,
self->output_buffer_duration_d);
out:
GST_OBJECT_UNLOCK (self);
return ret;
}
static void
gst_audio_buffer_split_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstAudioBufferSplit *self = GST_AUDIO_BUFFER_SPLIT (object);
switch (property_id) {
case PROP_OUTPUT_BUFFER_DURATION:
self->output_buffer_duration_n = gst_value_get_fraction_numerator (value);
self->output_buffer_duration_d =
gst_value_get_fraction_denominator (value);
gst_audio_buffer_split_update_samples_per_buffer (self);
break;
case PROP_ALIGNMENT_THRESHOLD:
GST_OBJECT_LOCK (self);
gst_audio_stream_align_set_alignment_threshold (self->stream_align,
g_value_get_uint64 (value));
GST_OBJECT_UNLOCK (self);
break;
case PROP_DISCONT_WAIT:
GST_OBJECT_LOCK (self);
gst_audio_stream_align_set_discont_wait (self->stream_align,
g_value_get_uint64 (value));
GST_OBJECT_UNLOCK (self);
break;
case PROP_STRICT_BUFFER_SIZE:
self->strict_buffer_size = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gst_audio_buffer_split_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstAudioBufferSplit *self = GST_AUDIO_BUFFER_SPLIT (object);
switch (property_id) {
case PROP_OUTPUT_BUFFER_DURATION:
gst_value_set_fraction (value, self->output_buffer_duration_n,
self->output_buffer_duration_d);
break;
case PROP_ALIGNMENT_THRESHOLD:
GST_OBJECT_LOCK (self);
g_value_set_uint64 (value,
gst_audio_stream_align_get_alignment_threshold (self->stream_align));
GST_OBJECT_UNLOCK (self);
break;
case PROP_DISCONT_WAIT:
GST_OBJECT_LOCK (self);
g_value_set_uint64 (value,
gst_audio_stream_align_get_discont_wait (self->stream_align));
GST_OBJECT_UNLOCK (self);
break;
case PROP_STRICT_BUFFER_SIZE:
g_value_set_boolean (value, self->strict_buffer_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_audio_buffer_split_change_state (GstElement * element,
GstStateChange transition)
{
GstAudioBufferSplit *self = GST_AUDIO_BUFFER_SPLIT (element);
GstStateChangeReturn state_ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_audio_info_init (&self->info);
gst_segment_init (&self->segment, GST_FORMAT_TIME);
GST_OBJECT_LOCK (self);
gst_audio_stream_align_mark_discont (self->stream_align);
GST_OBJECT_UNLOCK (self);
self->current_offset = -1;
self->accumulated_error = 0;
self->samples_per_buffer = 0;
break;
default:
break;
}
state_ret =
GST_ELEMENT_CLASS (gst_audio_buffer_split_parent_class)->change_state
(element, transition);
if (state_ret == GST_STATE_CHANGE_FAILURE)
return state_ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_adapter_clear (self->adapter);
GST_OBJECT_LOCK (self);
gst_audio_stream_align_mark_discont (self->stream_align);
GST_OBJECT_UNLOCK (self);
break;
default:
break;
}
return state_ret;
}
static GstFlowReturn
gst_audio_buffer_split_output (GstAudioBufferSplit * self, gboolean force,
gint rate, gint bpf, guint samples_per_buffer)
{
gint size, avail;
GstFlowReturn ret = GST_FLOW_OK;
GstClockTime resync_time;
GST_OBJECT_LOCK (self);
resync_time =
gst_audio_stream_align_get_timestamp_at_discont (self->stream_align);
GST_OBJECT_UNLOCK (self);
size = samples_per_buffer * bpf;
/* If we accumulated enough error for one sample, include one
* more sample in this buffer. Accumulated error is updated below */
if (self->error_per_buffer + self->accumulated_error >=
self->output_buffer_duration_d)
size += bpf;
while ((avail = gst_adapter_available (self->adapter)) >= size || (force
&& avail > 0)) {
GstBuffer *buffer;
GstClockTime resync_time_diff;
size = MIN (size, avail);
buffer = gst_adapter_take_buffer (self->adapter, size);
resync_time_diff =
gst_util_uint64_scale (self->current_offset, GST_SECOND, rate);
if (self->segment.rate < 0.0) {
if (resync_time > resync_time_diff)
GST_BUFFER_TIMESTAMP (buffer) = resync_time - resync_time_diff;
else
GST_BUFFER_TIMESTAMP (buffer) = 0;
GST_BUFFER_DURATION (buffer) =
gst_util_uint64_scale (size / bpf, GST_SECOND, rate);
self->current_offset += size / bpf;
} else {
GST_BUFFER_TIMESTAMP (buffer) = resync_time + resync_time_diff;
self->current_offset += size / bpf;
resync_time_diff =
gst_util_uint64_scale (self->current_offset, GST_SECOND, rate);
GST_BUFFER_DURATION (buffer) =
resync_time_diff - (GST_BUFFER_TIMESTAMP (buffer) - resync_time);
}
GST_BUFFER_OFFSET (buffer) = GST_BUFFER_OFFSET_NONE;
GST_BUFFER_OFFSET_END (buffer) = GST_BUFFER_OFFSET_NONE;
self->accumulated_error =
(self->accumulated_error +
self->error_per_buffer) % self->output_buffer_duration_d;
GST_LOG_OBJECT (self,
"Outputting buffer at timestamp %" GST_TIME_FORMAT " with duration %"
GST_TIME_FORMAT " (%u samples)",
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)), size / bpf);
ret = gst_pad_push (self->srcpad, buffer);
if (ret != GST_FLOW_OK)
break;
}
return ret;
}
static GstFlowReturn
gst_audio_buffer_split_handle_discont (GstAudioBufferSplit * self,
GstBuffer * buffer, gint rate, gint bpf, guint samples_per_buffer)
{
gboolean discont;
GstFlowReturn ret = GST_FLOW_OK;
GST_OBJECT_LOCK (self);
discont =
gst_audio_stream_align_process (self->stream_align,
self->segment.rate < 0 ? FALSE : GST_BUFFER_IS_DISCONT (buffer)
|| GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_RESYNC),
GST_BUFFER_PTS (buffer), gst_buffer_get_size (buffer) / bpf, NULL, NULL,
NULL);
GST_OBJECT_UNLOCK (self);
if (discont) {
if (self->strict_buffer_size) {
gst_adapter_clear (self->adapter);
ret = GST_FLOW_OK;
} else {
ret =
gst_audio_buffer_split_output (self, TRUE, rate, bpf,
samples_per_buffer);
}
self->current_offset = 0;
self->accumulated_error = 0;
}
return ret;
}
static GstBuffer *
gst_audio_buffer_split_clip_buffer (GstAudioBufferSplit * self,
GstBuffer * buffer, const GstSegment * segment, gint rate, gint bpf)
{
return gst_audio_buffer_clip (buffer, segment, rate, bpf);
}
static GstFlowReturn
gst_audio_buffer_split_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstAudioBufferSplit *self = GST_AUDIO_BUFFER_SPLIT (parent);
GstFlowReturn ret;
GstAudioFormat format;
gint rate, bpf, samples_per_buffer;
GST_OBJECT_LOCK (self);
format =
self->info.
finfo ? GST_AUDIO_INFO_FORMAT (&self->info) : GST_AUDIO_FORMAT_UNKNOWN;
rate = GST_AUDIO_INFO_RATE (&self->info);
bpf = GST_AUDIO_INFO_BPF (&self->info);
samples_per_buffer = self->samples_per_buffer;
GST_OBJECT_UNLOCK (self);
if (format == GST_AUDIO_FORMAT_UNKNOWN || samples_per_buffer == 0) {
gst_buffer_unref (buffer);
return GST_FLOW_NOT_NEGOTIATED;
}
buffer =
gst_audio_buffer_split_clip_buffer (self, buffer, &self->segment, rate,
bpf);
if (!buffer)
return GST_FLOW_OK;
ret =
gst_audio_buffer_split_handle_discont (self, buffer, rate, bpf,
samples_per_buffer);
if (ret != GST_FLOW_OK) {
gst_buffer_unref (buffer);
return ret;
}
gst_adapter_push (self->adapter, buffer);
return gst_audio_buffer_split_output (self, FALSE, rate, bpf,
samples_per_buffer);
}
static gboolean
gst_audio_buffer_split_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstAudioBufferSplit *self = GST_AUDIO_BUFFER_SPLIT (parent);
gboolean ret = FALSE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:{
GstCaps *caps;
GstAudioInfo info;
gst_event_parse_caps (event, &caps);
ret = gst_audio_info_from_caps (&info, caps);
if (ret) {
GST_DEBUG_OBJECT (self, "Got caps %" GST_PTR_FORMAT, caps);
if (!gst_audio_info_is_equal (&info, &self->info)) {
if (self->strict_buffer_size) {
gst_adapter_clear (self->adapter);
} else {
GstAudioFormat format;
gint rate, bpf, samples_per_buffer;
GST_OBJECT_LOCK (self);
format =
self->info.finfo ? GST_AUDIO_INFO_FORMAT (&self->info) :
GST_AUDIO_FORMAT_UNKNOWN;
rate = GST_AUDIO_INFO_RATE (&self->info);
bpf = GST_AUDIO_INFO_BPF (&self->info);
samples_per_buffer = self->samples_per_buffer;
GST_OBJECT_UNLOCK (self);
if (format != GST_AUDIO_FORMAT_UNKNOWN && samples_per_buffer != 0)
gst_audio_buffer_split_output (self, TRUE, rate, bpf,
samples_per_buffer);
}
}
self->info = info;
GST_OBJECT_LOCK (self);
gst_audio_stream_align_set_rate (self->stream_align, self->info.rate);
GST_OBJECT_UNLOCK (self);
ret = gst_audio_buffer_split_update_samples_per_buffer (self);
} else {
ret = FALSE;
}
if (ret)
ret = gst_pad_event_default (pad, parent, event);
else
gst_event_unref (event);
break;
}
case GST_EVENT_FLUSH_STOP:
gst_segment_init (&self->segment, GST_FORMAT_TIME);
GST_OBJECT_LOCK (self);
gst_audio_stream_align_mark_discont (self->stream_align);
GST_OBJECT_UNLOCK (self);
self->current_offset = -1;
self->accumulated_error = 0;
gst_adapter_clear (self->adapter);
ret = gst_pad_event_default (pad, parent, event);
break;
case GST_EVENT_SEGMENT:
gst_event_copy_segment (event, &self->segment);
if (self->segment.format != GST_FORMAT_TIME) {
gst_event_unref (event);
ret = FALSE;
} else {
ret = gst_pad_event_default (pad, parent, event);
}
break;
case GST_EVENT_EOS:
if (self->strict_buffer_size) {
gst_adapter_clear (self->adapter);
} else {
GstAudioFormat format;
gint rate, bpf, samples_per_buffer;
GST_OBJECT_LOCK (self);
format =
self->info.finfo ? GST_AUDIO_INFO_FORMAT (&self->info) :
GST_AUDIO_FORMAT_UNKNOWN;
rate = GST_AUDIO_INFO_RATE (&self->info);
bpf = GST_AUDIO_INFO_BPF (&self->info);
samples_per_buffer = self->samples_per_buffer;
GST_OBJECT_UNLOCK (self);
if (format != GST_AUDIO_FORMAT_UNKNOWN && samples_per_buffer != 0)
gst_audio_buffer_split_output (self, TRUE, rate, bpf,
samples_per_buffer);
}
ret = gst_pad_event_default (pad, parent, event);
break;
default:
ret = gst_pad_event_default (pad, parent, event);
break;
}
return ret;
}
static gboolean
gst_audio_buffer_split_src_query (GstPad * pad,
GstObject * parent, GstQuery * query)
{
GstAudioBufferSplit *self = GST_AUDIO_BUFFER_SPLIT (parent);
gboolean ret = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:{
if ((ret = gst_pad_peer_query (self->sinkpad, query))) {
GstClockTime latency;
GstClockTime min, max;
gboolean live;
gst_query_parse_latency (query, &live, &min, &max);
GST_DEBUG_OBJECT (self, "Peer latency: min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
GST_TIME_ARGS (min), GST_TIME_ARGS (max));
latency =
gst_util_uint64_scale (GST_SECOND, self->output_buffer_duration_n,
self->output_buffer_duration_d);
GST_DEBUG_OBJECT (self, "Our latency: min %" GST_TIME_FORMAT
", max %" GST_TIME_FORMAT,
GST_TIME_ARGS (latency), GST_TIME_ARGS (latency));
min += latency;
if (max != GST_CLOCK_TIME_NONE)
max += latency;
GST_DEBUG_OBJECT (self, "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);
}
break;
}
default:
ret = gst_pad_query_default (pad, parent, query);
break;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_audio_buffer_split_debug, "audiobuffersplit",
0, "Audio buffer splitter");
gst_element_register (plugin, "audiobuffersplit", GST_RANK_NONE,
GST_TYPE_AUDIO_BUFFER_SPLIT);
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
audiobuffersplit,
"Audio buffer splitter",
plugin_init, VERSION, "LGPL", PACKAGE_NAME, GST_PACKAGE_ORIGIN)