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/* -*- c-basic-offset: 2 -*-
* GStreamer
* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
/**
* SECTION:element-speed
*
* Plays an audio stream at a different speed (by resampling the audio).
*
* Do not use this element. Either use the 'pitch' element, or do a seek with
* a non-1.0 rate parameter, this will have the same effect as using the speed
* element (but relies on the decoder/demuxer to handle this correctly, also
* requires a fairly up-to-date gst-plugins-base, as of February 2007).
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch filesrc location=test.ogg ! decodebin ! audioconvert ! speed speed=1.5 ! audioconvert ! audioresample ! autoaudiosink
* ]| Plays an .ogg file at 1.5x speed.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <math.h>
#include <gst/gst.h>
#include <gst/audio/audio.h>
#include "gstspeed.h"
GST_DEBUG_CATEGORY_STATIC (speed_debug);
#define GST_CAT_DEFAULT speed_debug
enum
{
PROP_0,
PROP_SPEED
};
/* assumption here: sizeof (gfloat) = 4 */
#define GST_SPEED_AUDIO_CAPS \
"audio/x-raw, " \
"format = {" GST_AUDIO_NE (F32) ", " GST_AUDIO_NE (S16) "}, " \
"rate = (int) [ 1, MAX ], " \
"channels = (int) [ 1, MAX ]"
static GstStaticPadTemplate gst_speed_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_SPEED_AUDIO_CAPS)
);
static GstStaticPadTemplate gst_speed_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_SPEED_AUDIO_CAPS)
);
static void speed_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void speed_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec);
static gboolean speed_parse_caps (GstSpeed * filter, const GstCaps * caps);
static GstFlowReturn speed_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static GstStateChangeReturn speed_change_state (GstElement * element,
GstStateChange transition);
static gboolean speed_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean speed_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
G_DEFINE_TYPE (GstSpeed, gst_speed, GST_TYPE_ELEMENT);
static gboolean
speed_setcaps (GstPad * pad, GstCaps * caps)
{
GstSpeed *filter;
gboolean ret;
filter = GST_SPEED (gst_pad_get_parent (pad));
ret = speed_parse_caps (filter, caps);
gst_object_unref (filter);
return ret;
}
static gboolean
speed_parse_caps (GstSpeed * filter, const GstCaps * caps)
{
g_return_val_if_fail (filter != NULL, FALSE);
g_return_val_if_fail (caps != NULL, FALSE);
if (!gst_audio_info_from_caps (&filter->info, caps))
return FALSE;
return TRUE;
}
static gboolean
speed_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstSpeed *filter;
gboolean ret = FALSE;
filter = GST_SPEED (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:{
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
gst_event_unref (event);
if (format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (filter, "only support seeks in TIME format");
break;
}
if (start_type != GST_SEEK_TYPE_NONE && start != -1) {
start *= filter->speed;
}
if (stop_type != GST_SEEK_TYPE_NONE && stop != -1) {
stop *= filter->speed;
}
event = gst_event_new_seek (rate, format, flags, start_type, start,
stop_type, stop);
GST_LOG ("sending seek event: %" GST_PTR_FORMAT,
gst_event_get_structure (event));
ret = gst_pad_send_event (GST_PAD_PEER (filter->sinkpad), event);
break;
}
default:
ret = gst_pad_event_default (pad, parent, event);
break;
}
return ret;
}
static gboolean
gst_speed_convert (GstSpeed * filter, GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean ret = TRUE;
guint scale = 1;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
if (GST_AUDIO_INFO_BPF (&filter->info) == 0) {
ret = FALSE;
break;
}
*dest_value = src_value / GST_AUDIO_INFO_BPF (&filter->info);
break;
case GST_FORMAT_TIME:
{
gint byterate =
GST_AUDIO_INFO_BPF (&filter->info) *
GST_AUDIO_INFO_RATE (&filter->info);
if (byterate == 0) {
ret = FALSE;
break;
}
*dest_value = src_value * GST_SECOND / byterate;
break;
}
default:
ret = FALSE;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_BYTES:
*dest_value = src_value * GST_AUDIO_INFO_BPF (&filter->info);
break;
case GST_FORMAT_TIME:
if (GST_AUDIO_INFO_RATE (&filter->info) == 0) {
ret = FALSE;
break;
}
*dest_value =
src_value * GST_SECOND / GST_AUDIO_INFO_RATE (&filter->info);
break;
default:
ret = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
scale = GST_AUDIO_INFO_BPF (&filter->info);
/* fallthrough */
case GST_FORMAT_DEFAULT:
*dest_value =
src_value * scale * GST_AUDIO_INFO_RATE (&filter->info) /
GST_SECOND;
break;
default:
ret = FALSE;
}
break;
default:
ret = FALSE;
}
return ret;
}
static gboolean
speed_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
gboolean ret = TRUE;
GstSpeed *filter;
filter = GST_SPEED (parent);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
GstFormat format;
GstFormat rformat = GST_FORMAT_TIME;
gint64 cur;
GstFormat conv_format = GST_FORMAT_TIME;
/* save requested format */
gst_query_parse_position (query, &format, NULL);
/* query peer for current position in time */
gst_query_set_position (query, GST_FORMAT_TIME, -1);
if (!gst_pad_peer_query_position (filter->sinkpad, rformat, &cur)) {
GST_LOG_OBJECT (filter, "TIME query on peer pad failed, trying BYTES");
rformat = GST_FORMAT_BYTES;
if (!gst_pad_peer_query_position (filter->sinkpad, rformat, &cur)) {
GST_LOG_OBJECT (filter, "BYTES query on peer pad failed too");
goto error;
}
}
if (rformat == GST_FORMAT_BYTES)
GST_LOG_OBJECT (filter,
"peer pad returned current=%" G_GINT64_FORMAT " bytes", cur);
else if (rformat == GST_FORMAT_TIME)
GST_LOG_OBJECT (filter, "peer pad returned time=%" G_GINT64_FORMAT,
cur);
/* convert to time format */
if (!gst_speed_convert (filter, rformat, cur, &conv_format, &cur)) {
ret = FALSE;
break;
}
/* adjust for speed factor */
cur /= filter->speed;
/* convert to time format */
if (!gst_speed_convert (filter, conv_format, cur, &format, &cur)) {
ret = FALSE;
break;
}
gst_query_set_position (query, format, cur);
GST_LOG_OBJECT (filter,
"position query: we return %" G_GUINT64_FORMAT " (format %u)", cur,
format);
break;
}
case GST_QUERY_DURATION:
{
GstFormat format;
GstFormat rformat = GST_FORMAT_TIME;
gint64 end;
GstFormat conv_format = GST_FORMAT_TIME;
/* save requested format */
gst_query_parse_duration (query, &format, NULL);
/* query peer for total length in time */
gst_query_set_duration (query, GST_FORMAT_TIME, -1);
if (!gst_pad_peer_query_duration (filter->sinkpad, rformat, &end)) {
GST_LOG_OBJECT (filter, "TIME query on peer pad failed, trying BYTES");
rformat = GST_FORMAT_BYTES;
if (!gst_pad_peer_query_duration (filter->sinkpad, rformat, &end)) {
GST_LOG_OBJECT (filter, "BYTES query on peer pad failed too");
goto error;
}
}
if (rformat == GST_FORMAT_BYTES)
GST_LOG_OBJECT (filter,
"peer pad returned total=%" G_GINT64_FORMAT " bytes", end);
else if (rformat == GST_FORMAT_TIME)
GST_LOG_OBJECT (filter, "peer pad returned time=%" G_GINT64_FORMAT,
end);
/* convert to time format */
if (!gst_speed_convert (filter, rformat, end, &conv_format, &end)) {
ret = FALSE;
break;
}
/* adjust for speed factor */
end /= filter->speed;
/* convert to time format */
if (!gst_speed_convert (filter, conv_format, end, &format, &end)) {
ret = FALSE;
break;
}
gst_query_set_duration (query, format, end);
GST_LOG_OBJECT (filter,
"duration query: we return %" G_GUINT64_FORMAT " (format %u)", end,
format);
break;
}
default:
ret = FALSE;
break;
}
return ret;
error:
gst_object_unref (filter);
GST_DEBUG ("error handling query");
return FALSE;
}
static void
gst_speed_class_init (GstSpeedClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
gobject_class->set_property = speed_set_property;
gobject_class->get_property = speed_get_property;
gstelement_class->change_state = speed_change_state;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SPEED,
g_param_spec_float ("speed", "speed", "speed",
0.1, 40.0, 1.0,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (gstelement_class, "Speed",
"Filter/Effect/Audio",
"Set speed/pitch on audio/raw streams (resampler)",
"Andy Wingo <apwingo@eos.ncsu.edu>, "
"Tim-Philipp Müller <tim@centricular.net>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_speed_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_speed_sink_template));
}
static void
gst_speed_init (GstSpeed * filter)
{
filter->sinkpad =
gst_pad_new_from_static_template (&gst_speed_sink_template, "sink");
gst_pad_set_chain_function (filter->sinkpad, speed_chain);
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
gst_pad_set_event_function (filter->sinkpad, speed_sink_event);
GST_PAD_SET_PROXY_CAPS (filter->sinkpad);
filter->srcpad =
gst_pad_new_from_static_template (&gst_speed_src_template, "src");
gst_pad_set_query_function (filter->srcpad, speed_src_query);
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
gst_pad_set_event_function (filter->srcpad, speed_src_event);
GST_PAD_SET_PROXY_CAPS (filter->srcpad);
filter->offset = 0;
filter->timestamp = 0;
}
static inline guint
speed_chain_int16 (GstSpeed * filter, GstBuffer * in_buf, GstBuffer * out_buf,
guint c, guint in_samples)
{
gint16 *in_data, *out_data;
gfloat interp, lower, i_float;
guint i, j;
GstMapInfo in_info, out_info;
gst_buffer_map (in_buf, &in_info, GST_MAP_READ);
gst_buffer_map (out_buf, &out_info, GST_MAP_WRITE);
in_data = (gint16 *) in_info.data + c;
out_data = (gint16 *) out_info.data + c;
lower = in_data[0];
i_float = 0.5 * (filter->speed - 1.0);
i = (guint) ceil (i_float);
j = 0;
while (i < in_samples) {
interp = i_float - floor (i_float);
out_data[j * GST_AUDIO_INFO_CHANNELS (&filter->info)] =
lower * (1 - interp) +
in_data[i * GST_AUDIO_INFO_CHANNELS (&filter->info)] * interp;
lower = in_data[i * GST_AUDIO_INFO_CHANNELS (&filter->info)];
i_float += filter->speed;
i = (guint) ceil (i_float);
++j;
}
gst_buffer_unmap (in_buf, &in_info);
gst_buffer_unmap (out_buf, &out_info);
return j;
}
static inline guint
speed_chain_float32 (GstSpeed * filter, GstBuffer * in_buf, GstBuffer * out_buf,
guint c, guint in_samples)
{
gfloat *in_data, *out_data;
gfloat interp, lower, i_float;
guint i, j;
GstMapInfo in_info, out_info;
gst_buffer_map (in_buf, &in_info, GST_MAP_WRITE);
gst_buffer_map (out_buf, &out_info, GST_MAP_WRITE);
in_data = (gfloat *) in_info.data + c;
out_data = (gfloat *) out_info.data + c;
lower = in_data[0];
i_float = 0.5 * (filter->speed - 1.0);
i = (guint) ceil (i_float);
j = 0;
while (i < in_samples) {
interp = i_float - floor (i_float);
out_data[j * GST_AUDIO_INFO_CHANNELS (&filter->info)] =
lower * (1 - interp) +
in_data[i * GST_AUDIO_INFO_CHANNELS (&filter->info)] * interp;
lower = in_data[i * GST_AUDIO_INFO_CHANNELS (&filter->info)];
i_float += filter->speed;
i = (guint) ceil (i_float);
++j;
}
gst_buffer_unmap (in_buf, &in_info);
gst_buffer_unmap (out_buf, &out_info);
return j;
}
static gboolean
speed_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstSpeed *filter = GST_SPEED (parent);
gboolean ret = FALSE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEGMENT:{
gdouble rate;
GstFormat format;
gint64 start_value, stop_value, base;
const GstSegment *segment;
GstSegment seg;
gst_event_parse_segment (event, &segment);
rate = segment->rate;
format = segment->format;
start_value = segment->start;
stop_value = segment->stop;
base = segment->base;
gst_event_unref (event);
if (format != GST_FORMAT_TIME) {
GST_WARNING_OBJECT (filter, "newsegment event not in TIME format!");
break;
}
g_assert (filter->speed > 0);
if (start_value >= 0)
start_value /= filter->speed;
if (stop_value >= 0)
stop_value /= filter->speed;
base /= filter->speed;
/* this would only really be correct if we clipped incoming data */
filter->timestamp = start_value;
/* set to NONE so it gets reset later based on the timestamp when we have
* the samplerate */
filter->offset = GST_BUFFER_OFFSET_NONE;
gst_segment_init (&seg, GST_FORMAT_TIME);
seg.rate = rate;
seg.start = start_value;
seg.stop = stop_value;
seg.time = segment->time;
ret = gst_pad_push_event (filter->srcpad, gst_event_new_segment (&seg));
break;
}
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = speed_setcaps (pad, caps);
if (!ret) {
gst_event_unref (event);
return ret;
}
}
/* Fallthrough so that the caps event gets forwarded */
default:
ret = gst_pad_event_default (pad, parent, event);
break;
}
return ret;
}
static GstFlowReturn
speed_chain (GstPad * pad, GstObject * parent, GstBuffer * in_buf)
{
GstBuffer *out_buf;
GstSpeed *filter = GST_SPEED (parent);
guint c, in_samples, out_samples, out_size;
GstFlowReturn flow;
gsize size;
if (G_UNLIKELY (filter->offset == GST_BUFFER_OFFSET_NONE)) {
filter->offset = gst_util_uint64_scale_int (filter->timestamp,
GST_AUDIO_INFO_RATE (&filter->info), GST_SECOND);
}
/* buffersize has to be aligned to a frame */
out_size = ceil ((gfloat) gst_buffer_get_size (in_buf) / filter->speed);
out_size = ((out_size + GST_AUDIO_INFO_BPF (&filter->info) - 1) /
GST_AUDIO_INFO_BPF (&filter->info)) * GST_AUDIO_INFO_BPF (&filter->info);
out_buf = gst_buffer_new_and_alloc (out_size);
in_samples = gst_buffer_get_size (in_buf) /
GST_AUDIO_INFO_BPF (&filter->info);
out_samples = 0;
for (c = 0; c < GST_AUDIO_INFO_CHANNELS (&filter->info); ++c) {
if (GST_AUDIO_INFO_IS_INTEGER (&filter->info))
out_samples = speed_chain_int16 (filter, in_buf, out_buf, c, in_samples);
else
out_samples =
speed_chain_float32 (filter, in_buf, out_buf, c, in_samples);
}
size = out_samples * GST_AUDIO_INFO_BPF (&filter->info);
gst_buffer_set_size (out_buf, size);
GST_BUFFER_OFFSET (out_buf) = filter->offset;
GST_BUFFER_TIMESTAMP (out_buf) = filter->timestamp;
filter->offset += size / GST_AUDIO_INFO_BPF (&filter->info);
filter->timestamp = gst_util_uint64_scale_int (filter->offset, GST_SECOND,
GST_AUDIO_INFO_RATE (&filter->info));
/* make sure it's at least nominally a perfect stream */
GST_BUFFER_DURATION (out_buf) =
filter->timestamp - GST_BUFFER_TIMESTAMP (out_buf);
flow = gst_pad_push (filter->srcpad, out_buf);
if (G_UNLIKELY (flow != GST_FLOW_OK))
GST_DEBUG_OBJECT (filter, "flow: %s", gst_flow_get_name (flow));
gst_buffer_unref (in_buf);
return flow;
}
static void
speed_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstSpeed *filter = GST_SPEED (object);
switch (prop_id) {
case PROP_SPEED:
filter->speed = g_value_get_float (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
speed_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstSpeed *filter = GST_SPEED (object);
switch (prop_id) {
case PROP_SPEED:
g_value_set_float (value, filter->speed);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
speed_change_state (GstElement * element, GstStateChange transition)
{
GstSpeed *speed = GST_SPEED (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
speed->offset = GST_BUFFER_OFFSET_NONE;
speed->timestamp = 0;
gst_audio_info_init (&speed->info);
break;
default:
break;
}
return GST_ELEMENT_CLASS (gst_speed_parent_class)->change_state (element,
transition);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (speed_debug, "speed", 0, "speed element");
return gst_element_register (plugin, "speed", GST_RANK_NONE, GST_TYPE_SPEED);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
speed,
"Set speed/pitch on audio/raw streams (resampler)",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)