/* -*- c-basic-offset: 2 -*- * GStreamer * Copyright (C) 1999-2001 Erik Walthinsen * * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:element-speed * * Plays an audio stream at a different speed. * * 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). * * * Example launch line * |[ * gst-launch filesrc location=test.ogg ! decodebin ! audioconvert ! speed speed=1.5 ! audioconvert ! audioresample ! autoaudiosink * ]| Plays an .ogg file at 1.5x speed. * * * Last reviewed on 2007-02-26 (0.10.4.1) */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include "gstspeed.h" GST_DEBUG_CATEGORY_STATIC (speed_debug); #define GST_CAT_DEFAULT speed_debug /* elementfactory information */ static const GstElementDetails speed_details = GST_ELEMENT_DETAILS ("Speed", "Filter/Effect/Audio", "Set speed/pitch on audio/raw streams (resampler)", "Andy Wingo , " "Tim-Philipp Müller "); enum { ARG_0, ARG_SPEED }; /* assumption here: sizeof (gfloat) = 4 */ #define GST_SPEED_AUDIO_CAPS \ "audio/x-raw-float, " \ "rate = (int) [ 1, MAX ], " \ "channels = (int) [ 1, MAX ], " \ "endianness = (int) BYTE_ORDER, " \ "width = (int) 32; " \ \ "audio/x-raw-int, " \ "rate = (int) [ 1, MAX ], " \ "channels = (int) [ 1, MAX ], " \ "endianness = (int) BYTE_ORDER, " \ "width = (int) 16, " \ "depth = (int) 16, " \ "signed = (boolean) true" 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_base_init (gpointer g_class); static void speed_class_init (GstSpeedClass * klass); static void speed_init (GstSpeed * filter); 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, GstBuffer * buf); static GstStateChangeReturn speed_change_state (GstElement * element, GstStateChange transition); static gboolean speed_sink_event (GstPad * pad, GstEvent * event); static gboolean speed_src_event (GstPad * pad, GstEvent * event); static GstElementClass *parent_class; /* NULL */ static gboolean speed_setcaps (GstPad * pad, GstCaps * caps) { GstSpeed *filter; GstPad *otherpad; gboolean ret; filter = GST_SPEED (gst_pad_get_parent (pad)); otherpad = (pad == filter->srcpad) ? filter->sinkpad : filter->srcpad; if ((ret = speed_parse_caps (filter, caps))) ret = gst_pad_set_caps (otherpad, caps); gst_object_unref (filter); return ret; } static gboolean speed_parse_caps (GstSpeed * filter, const GstCaps * caps) { GstStructure *structure; gint rate, chans, width; g_return_val_if_fail (filter != NULL, FALSE); g_return_val_if_fail (caps != NULL, FALSE); structure = gst_caps_get_structure (caps, 0); if (gst_structure_has_name (structure, "audio/x-raw-float")) filter->format = GST_SPEED_FORMAT_FLOAT; else if (gst_structure_has_name (structure, "audio/x-raw-int")) filter->format = GST_SPEED_FORMAT_INT; else return FALSE; if (!gst_structure_get_int (structure, "rate", &rate) || !gst_structure_get_int (structure, "width", &width) || !gst_structure_get_int (structure, "channels", &chans)) { return FALSE; } filter->rate = rate; filter->width = width; filter->channels = chans; if (filter->format == GST_SPEED_FORMAT_FLOAT) { filter->sample_size = filter->channels * filter->width / 8; } else { /* our caps only allow width == depth for now */ filter->sample_size = filter->channels * filter->width / 8; } return TRUE; } GType gst_speed_get_type (void) { static GType speed_type = 0; if (!speed_type) { static const GTypeInfo speed_info = { sizeof (GstSpeedClass), speed_base_init, NULL, (GClassInitFunc) speed_class_init, NULL, NULL, sizeof (GstSpeed), 0, (GInstanceInitFunc) speed_init, }; speed_type = g_type_register_static (GST_TYPE_ELEMENT, "GstSpeed", &speed_info, 0); } return speed_type; } static const GstQueryType * speed_get_query_types (GstPad * pad) { static const GstQueryType src_query_types[] = { GST_QUERY_POSITION, GST_QUERY_DURATION, 0 }; return src_query_types; } static gboolean speed_src_event (GstPad * pad, GstEvent * event) { GstSpeed *filter; gboolean ret = FALSE; filter = GST_SPEED (gst_pad_get_parent (pad)); 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, event->structure); ret = gst_pad_send_event (GST_PAD_PEER (filter->sinkpad), event); break; } default: ret = gst_pad_event_default (pad, event); break; } gst_object_unref (filter); return ret; } static gboolean gst_speed_convert (GstPad * pad, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value) { gboolean ret = TRUE; guint scale = 1; GstSpeed *filter; if (src_format == *dest_format) { *dest_value = src_value; return TRUE; } filter = GST_SPEED (GST_PAD_PARENT (pad)); switch (src_format) { case GST_FORMAT_BYTES: switch (*dest_format) { case GST_FORMAT_DEFAULT: if (filter->sample_size == 0) { ret = FALSE; break; } *dest_value = src_value / filter->sample_size; break; case GST_FORMAT_TIME: { gint byterate = filter->sample_size * filter->rate; 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 * filter->sample_size; break; case GST_FORMAT_TIME: if (filter->rate == 0) { ret = FALSE; break; } *dest_value = src_value * GST_SECOND / filter->rate; break; default: ret = FALSE; } break; case GST_FORMAT_TIME: switch (*dest_format) { case GST_FORMAT_BYTES: scale = filter->sample_size; /* fallthrough */ case GST_FORMAT_DEFAULT: *dest_value = src_value * scale * filter->rate / GST_SECOND; break; default: ret = FALSE; } break; default: ret = FALSE; } return ret; } static gboolean speed_src_query (GstPad * pad, GstQuery * query) { gboolean ret = TRUE; GstSpeed *filter; filter = GST_SPEED (gst_pad_get_parent (pad)); 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_query_peer_position (filter->sinkpad, &rformat, &cur)) { GST_LOG_OBJECT (filter, "query on peer pad failed"); 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 (pad, rformat, cur, &conv_format, &cur)) { ret = FALSE; break; } /* adjust for speed factor */ cur /= filter->speed; /* convert to time format */ if (!gst_speed_convert (pad, 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_query_peer_duration (filter->sinkpad, &rformat, &end)) { GST_LOG_OBJECT (filter, "query on peer pad failed"); 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 (pad, rformat, end, &conv_format, &end)) { ret = FALSE; break; } /* adjust for speed factor */ end /= filter->speed; /* convert to time format */ if (!gst_speed_convert (pad, 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; } gst_object_unref (filter); return ret; error: gst_object_unref (filter); GST_DEBUG ("error handling query"); return FALSE; } static void speed_base_init (gpointer g_class) { GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); gst_element_class_set_details (element_class, &speed_details); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_speed_src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_speed_sink_template)); } static void 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; parent_class = g_type_class_peek_parent (klass); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SPEED, g_param_spec_float ("speed", "speed", "speed", 0.1, 40.0, 1.0, G_PARAM_READWRITE | G_PARAM_CONSTRUCT)); } static void speed_init (GstSpeed * filter) { filter->sinkpad = gst_pad_new_from_static_template (&gst_speed_sink_template, "sink"); gst_pad_set_setcaps_function (filter->sinkpad, speed_setcaps); 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); filter->srcpad = gst_pad_new_from_static_template (&gst_speed_src_template, "src"); gst_pad_set_setcaps_function (filter->srcpad, speed_setcaps); gst_pad_set_query_type_function (filter->srcpad, speed_get_query_types); 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); filter->offset = 0; filter->timestamp = 0; filter->sample_size = 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; in_data = ((gint16 *) GST_BUFFER_DATA (in_buf)) + c; out_data = ((gint16 *) GST_BUFFER_DATA (out_buf)) + 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 * filter->channels] = lower * (1 - interp) + in_data[i * filter->channels] * interp; lower = in_data[i * filter->channels]; i_float += filter->speed; i = (guint) ceil (i_float); ++j; } 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; in_data = ((gfloat *) GST_BUFFER_DATA (in_buf)) + c; out_data = ((gfloat *) GST_BUFFER_DATA (out_buf)) + 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 * filter->channels] = lower * (1 - interp) + in_data[i * filter->channels] * interp; lower = in_data[i * filter->channels]; i_float += filter->speed; i = (guint) ceil (i_float); ++j; } return j; } static gboolean speed_sink_event (GstPad * pad, GstEvent * event) { GstSpeed *filter; gboolean ret = FALSE; filter = GST_SPEED (gst_pad_get_parent (pad)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_NEWSEGMENT:{ gdouble rate; gboolean update = FALSE; GstFormat format; gint64 start_value, stop_value, base; gst_event_parse_new_segment (event, &update, &rate, &format, &start_value, &stop_value, &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; ret = gst_pad_event_default (pad, gst_event_new_new_segment (update, rate, format, start_value, stop_value, base)); break; } default: ret = gst_pad_event_default (pad, event); break; } gst_object_unref (filter); return ret; } static GstFlowReturn speed_chain (GstPad * pad, GstBuffer * in_buf) { GstBuffer *out_buf; GstSpeed *filter; guint c, in_samples, out_samples, out_size; GstFlowReturn flow; filter = GST_SPEED (GST_PAD_PARENT (pad)); if (G_UNLIKELY (filter->sample_size == 0 || filter->rate == 0)) { flow = GST_FLOW_NOT_NEGOTIATED; goto done; } if (G_UNLIKELY (filter->offset == GST_BUFFER_OFFSET_NONE)) { filter->offset = gst_util_uint64_scale_int (filter->timestamp, filter->rate, GST_SECOND); } /* buffersize has to be aligned by samplesize */ out_size = ceil ((gfloat) GST_BUFFER_SIZE (in_buf) / filter->speed); out_size = ((out_size + filter->sample_size - 1) / filter->sample_size) * filter->sample_size; flow = gst_pad_alloc_buffer_and_set_caps (filter->srcpad, -1, out_size, GST_PAD_CAPS (filter->srcpad), &out_buf); if (flow != GST_FLOW_OK) goto done; in_samples = GST_BUFFER_SIZE (in_buf) / filter->sample_size; out_samples = 0; for (c = 0; c < filter->channels; ++c) { if (filter->format == GST_SPEED_FORMAT_INT) { 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); } } GST_BUFFER_SIZE (out_buf) = out_samples * filter->sample_size; GST_BUFFER_OFFSET (out_buf) = filter->offset; GST_BUFFER_TIMESTAMP (out_buf) = filter->timestamp; filter->offset += GST_BUFFER_SIZE (out_buf) / filter->sample_size; filter->timestamp = gst_util_uint64_scale_int (filter->offset, GST_SECOND, filter->rate); /* 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); done: 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 ARG_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 ARG_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; break; default: break; } if (GST_ELEMENT_CLASS (parent_class)->change_state) return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); return GST_STATE_CHANGE_SUCCESS; } 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)