/* GStreamer * Copyright (C) <1999> 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. */ #include #include #include extern GstPadTemplate *gst_flacenc_src_template, *gst_flacenc_sink_template; /* elementfactory information */ GstElementDetails flacenc_details = { "FLAC encoder", "Codec/Audio/Encoder", "Encodes audio with the FLAC lossless audio encoder", VERSION, "Wim Taymans ", "(C) 2001", }; /* FlacEnc signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; enum { ARG_0, ARG_QUALITY, ARG_STREAMABLE_SUBSET, ARG_MID_SIDE_STEREO, ARG_LOOSE_MID_SIDE_STEREO, ARG_BLOCKSIZE, ARG_MAX_LPC_ORDER, ARG_QLP_COEFF_PRECISION, ARG_QLP_COEFF_PREC_SEARCH, ARG_ESCAPE_CODING, ARG_EXHAUSTIVE_MODEL_SEARCH, ARG_MIN_RESIDUAL_PARTITION_ORDER, ARG_MAX_RESIDUAL_PARTITION_ORDER, ARG_RICE_PARAMETER_SEARCH_DIST, }; static void gst_flacenc_init (FlacEnc *flacenc); static void gst_flacenc_class_init (FlacEncClass *klass); static void gst_flacenc_dispose (GObject *object); static GstPadConnectReturn gst_flacenc_sinkconnect (GstPad *pad, GstCaps *caps); static void gst_flacenc_chain (GstPad *pad, GstBuffer *buf); static gboolean gst_flacenc_update_quality (FlacEnc *flacenc, gint quality); static void gst_flacenc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gst_flacenc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); static GstElementStateReturn gst_flacenc_change_state (GstElement *element); static FLAC__StreamEncoderWriteStatus gst_flacenc_write_callback (const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data); static void gst_flacenc_metadata_callback (const FLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data); static GstElementClass *parent_class = NULL; /*static guint gst_flacenc_signals[LAST_SIGNAL] = { 0 }; */ GType flacenc_get_type (void) { static GType flacenc_type = 0; if (!flacenc_type) { static const GTypeInfo flacenc_info = { sizeof(FlacEncClass), NULL, NULL, (GClassInitFunc)gst_flacenc_class_init, NULL, NULL, sizeof(FlacEnc), 0, (GInstanceInitFunc)gst_flacenc_init, }; flacenc_type = g_type_register_static (GST_TYPE_ELEMENT, "FlacEnc", &flacenc_info, 0); } return flacenc_type; } typedef struct { gboolean exhaustive_model_search; gboolean escape_coding; gboolean mid_side; gboolean loose_mid_side; guint qlp_coeff_precision; gboolean qlp_coeff_prec_search; guint min_residual_partition_order; guint max_residual_partition_order; guint rice_parameter_search_dist; guint max_lpc_order; guint blocksize; } FlacEncParams; static const FlacEncParams flacenc_params[] = { { FALSE, FALSE, FALSE, FALSE, 0, FALSE, 2, 2, 0, 0, 1152 }, { FALSE, FALSE, TRUE, TRUE, 0, FALSE, 2, 2, 0, 0, 1152 }, { FALSE, FALSE, TRUE, FALSE, 0, FALSE, 0, 3, 0, 0, 1152 }, { FALSE, FALSE, FALSE, FALSE, 0, FALSE, 3, 3, 0, 6, 4608 }, { FALSE, FALSE, TRUE, TRUE, 0, FALSE, 3, 3, 0, 8, 4608 }, { FALSE, FALSE, TRUE, FALSE, 0, FALSE, 3, 3, 0, 8, 4608 }, { FALSE, FALSE, TRUE, FALSE, 0, FALSE, 0, 4, 0, 8, 4608 }, { TRUE, FALSE, TRUE, FALSE, 0, FALSE, 0, 6, 0, 8, 4608 }, { TRUE, FALSE, TRUE, FALSE, 0, FALSE, 0, 6, 0, 12, 4608 }, { TRUE, TRUE, TRUE, FALSE, 0, FALSE, 0, 16, 0, 32, 4608 }, }; #define DEFAULT_QUALITY 5 #define GST_TYPE_FLACENC_QUALITY (gst_flacenc_quality_get_type ()) GType gst_flacenc_quality_get_type (void) { static GType qtype = 0; if (qtype == 0) { static const GEnumValue values[] = { { 0, "0", "0 - Fastest compression" }, { 1, "1", "1" }, { 2, "2", "2" }, { 3, "3", "3" }, { 4, "4", "4" }, { 5, "5", "5 - Default" }, { 6, "6", "6" }, { 7, "7", "7" }, { 8, "8", "8 - Highest compression " }, { 9, "9", "9 - Insane" }, { 0, NULL, NULL } }; qtype = g_enum_register_static ("FlacEncQuality", values); } return qtype; } static void gst_flacenc_class_init (FlacEncClass *klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass*)klass; gstelement_class = (GstElementClass*)klass; parent_class = g_type_class_ref(GST_TYPE_ELEMENT); /* we have no properties atm so this is a bit silly */ gobject_class->set_property = gst_flacenc_set_property; gobject_class->get_property = gst_flacenc_get_property; gobject_class->dispose = gst_flacenc_dispose; g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_QUALITY, g_param_spec_enum ("quality", "Quality", "Speed versus compression tradeoff", GST_TYPE_FLACENC_QUALITY, DEFAULT_QUALITY, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_STREAMABLE_SUBSET, g_param_spec_boolean ("streamable_subset", "Streamable subset", "true to limit encoder to generating a Subset stream, else false", TRUE, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MID_SIDE_STEREO, g_param_spec_boolean ("mid_side_stereo", "Do mid side stereo", "Do mid side stereo (only for stereo input)", flacenc_params[DEFAULT_QUALITY].mid_side, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LOOSE_MID_SIDE_STEREO, g_param_spec_boolean ("loose_mid_side_stereo", "Loose mid side stereo", "Loose mid side stereo", flacenc_params[DEFAULT_QUALITY].loose_mid_side, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BLOCKSIZE, g_param_spec_uint ("blocksize", "Blocksize", "Blocksize in samples", FLAC__MIN_BLOCK_SIZE, FLAC__MAX_BLOCK_SIZE, flacenc_params[DEFAULT_QUALITY].blocksize, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MAX_LPC_ORDER, g_param_spec_uint ("max_lpc_order", "Max LPC order", "Max LPC order; 0 => use only fixed predictors", 0, FLAC__MAX_LPC_ORDER, flacenc_params[DEFAULT_QUALITY].max_lpc_order, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_QLP_COEFF_PRECISION, g_param_spec_uint ("qlp_coeff_precision", "QLP coefficients precision", "Precision in bits of quantized linear-predictor coefficients; 0 = automatic", 0, 32, flacenc_params[DEFAULT_QUALITY].qlp_coeff_precision, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_QLP_COEFF_PREC_SEARCH, g_param_spec_boolean ("qlp_coeff_prec_search", "Do QLP coefficients precision search", "false = use qlp_coeff_precision, " "true = search around qlp_coeff_precision, take best", flacenc_params[DEFAULT_QUALITY].qlp_coeff_prec_search, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_ESCAPE_CODING, g_param_spec_boolean ("escape_coding", "Do Escape coding", "search for escape codes in the entropy coding stage " "for slightly better compression", flacenc_params[DEFAULT_QUALITY].escape_coding, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_EXHAUSTIVE_MODEL_SEARCH, g_param_spec_boolean ("exhaustive_model_search", "Do exhaustive model search", "do exhaustive search of LP coefficient quantization (expensive!)", flacenc_params[DEFAULT_QUALITY].exhaustive_model_search, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MIN_RESIDUAL_PARTITION_ORDER, g_param_spec_uint ("min_residual_partition_order", "Min residual partition order", "Min residual partition order (above 4 doesn't usually help much)", 0, 16, flacenc_params[DEFAULT_QUALITY].min_residual_partition_order, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MAX_RESIDUAL_PARTITION_ORDER, g_param_spec_uint ("max_residual_partition_order", "Max residual partition order", "Max residual partition order (above 4 doesn't usually help much)", 0, 16, flacenc_params[DEFAULT_QUALITY].max_residual_partition_order, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_RICE_PARAMETER_SEARCH_DIST, g_param_spec_uint ("rice_parameter_search_dist", "rice_parameter_search_dist", "0 = try only calc'd parameter k; else try all [k-dist..k+dist] " "parameters, use best", 0, FLAC__MAX_RICE_PARTITION_ORDER, flacenc_params[DEFAULT_QUALITY].rice_parameter_search_dist, G_PARAM_READWRITE)); gstelement_class->change_state = gst_flacenc_change_state; } static void gst_flacenc_init (FlacEnc *flacenc) { flacenc->sinkpad = gst_pad_new_from_template (gst_flacenc_sink_template, "sink"); gst_element_add_pad(GST_ELEMENT(flacenc),flacenc->sinkpad); gst_pad_set_chain_function(flacenc->sinkpad,gst_flacenc_chain); gst_pad_set_connect_function (flacenc->sinkpad, gst_flacenc_sinkconnect); flacenc->srcpad = gst_pad_new_from_template (gst_flacenc_src_template, "src"); gst_element_add_pad(GST_ELEMENT(flacenc),flacenc->srcpad); GST_FLAG_SET (flacenc, GST_ELEMENT_EVENT_AWARE); flacenc->encoder = FLAC__stream_encoder_new(); FLAC__stream_encoder_set_write_callback (flacenc->encoder, gst_flacenc_write_callback); FLAC__stream_encoder_set_metadata_callback (flacenc->encoder, gst_flacenc_metadata_callback); FLAC__stream_encoder_set_client_data (flacenc->encoder, flacenc); flacenc->negotiated = FALSE; flacenc->first = TRUE; flacenc->first_buf = NULL; flacenc->data = NULL; gst_flacenc_update_quality (flacenc, DEFAULT_QUALITY); } static void gst_flacenc_dispose (GObject *object) { FlacEnc *flacenc = GST_FLACENC (object); FLAC__stream_encoder_delete (flacenc->encoder); G_OBJECT_CLASS (parent_class)->dispose (object); } static GstPadConnectReturn gst_flacenc_sinkconnect (GstPad *pad, GstCaps *caps) { FlacEnc *flacenc; flacenc = GST_FLACENC (gst_pad_get_parent (pad)); if (!GST_CAPS_IS_FIXED (caps)) return GST_PAD_CONNECT_DELAYED; gst_caps_get_int (caps, "channels", &flacenc->channels); gst_caps_get_int (caps, "depth", &flacenc->depth); gst_caps_get_int (caps, "rate", &flacenc->sample_rate); FLAC__stream_encoder_set_bits_per_sample (flacenc->encoder, flacenc->depth); FLAC__stream_encoder_set_sample_rate (flacenc->encoder, flacenc->sample_rate); FLAC__stream_encoder_set_channels (flacenc->encoder, flacenc->channels); flacenc->negotiated = TRUE; return GST_PAD_CONNECT_OK; } static gboolean gst_flacenc_update_quality (FlacEnc *flacenc, gint quality) { flacenc->quality = quality; #define DO_UPDATE(name, val, str) \ G_STMT_START{ \ if (FLAC__stream_encoder_get_##name (flacenc->encoder) != \ flacenc_params[quality].##val) { \ FLAC__stream_encoder_set_##name (flacenc->encoder, \ flacenc_params[quality].##val); \ g_object_notify (G_OBJECT (flacenc), str); \ }; \ } G_STMT_END g_object_freeze_notify (G_OBJECT (flacenc)); DO_UPDATE (do_mid_side_stereo, mid_side, "mid_side_stereo"); DO_UPDATE (loose_mid_side_stereo, loose_mid_side, "loose_mid_side"); DO_UPDATE (blocksize, blocksize, "blocksize"); DO_UPDATE (max_lpc_order, max_lpc_order, "max_lpc_order"); DO_UPDATE (qlp_coeff_precision, qlp_coeff_precision, "qlp_coeff_precision"); DO_UPDATE (do_qlp_coeff_prec_search, qlp_coeff_prec_search, "qlp_coeff_prec_search"); DO_UPDATE (do_escape_coding, escape_coding, "escape_coding"); DO_UPDATE (do_exhaustive_model_search, exhaustive_model_search, "exhaustive_model_search"); DO_UPDATE (min_residual_partition_order, min_residual_partition_order, "min_residual_partition_order"); DO_UPDATE (max_residual_partition_order, max_residual_partition_order, "max_residual_partition_order"); DO_UPDATE (rice_parameter_search_dist, rice_parameter_search_dist, "rice_parameter_search_dist"); #undef DO_UPDATE g_object_thaw_notify (G_OBJECT (flacenc)); return TRUE; } static FLAC__StreamEncoderWriteStatus gst_flacenc_write_callback (const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data) { FlacEnc *flacenc; GstBuffer *outbuf; flacenc = GST_FLACENC (client_data); if (flacenc->stopped) return FLAC__STREAM_ENCODER_WRITE_OK; outbuf = gst_buffer_new_and_alloc (bytes); memcpy (GST_BUFFER_DATA (outbuf), buffer, bytes); if (flacenc->first) { flacenc->first_buf = outbuf; gst_buffer_ref (outbuf); flacenc->first = FALSE; } gst_pad_push (flacenc->srcpad, outbuf); return FLAC__STREAM_ENCODER_WRITE_OK; } static void gst_flacenc_metadata_callback (const FLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data) { GstEvent *event; FlacEnc *flacenc; flacenc = GST_FLACENC (client_data); if (flacenc->stopped) return; event = gst_event_new_discontinuous (FALSE, GST_FORMAT_BYTES, 0, NULL); gst_pad_push (flacenc->srcpad, GST_BUFFER (event)); if (flacenc->first_buf) { const FLAC__uint64 samples = metadata->data.stream_info.total_samples; const unsigned min_framesize = metadata->data.stream_info.min_framesize; const unsigned max_framesize = metadata->data.stream_info.max_framesize; guint8 *data = GST_BUFFER_DATA (flacenc->first_buf); GstBuffer *outbuf = flacenc->first_buf; /* this looks evil but is actually how one is supposed to write * the stream stats according to the FLAC examples */ memcpy (&data[26], metadata->data.stream_info.md5sum, 16); data[21] = (data[21] & 0xf0) | (FLAC__byte)((samples >> 32) & 0x0f); data[22] = (FLAC__byte)((samples >> 24) & 0xff); data[23] = (FLAC__byte)((samples >> 16) & 0xff); data[24] = (FLAC__byte)((samples >> 8 ) & 0xff); data[25] = (FLAC__byte)((samples ) & 0xff); data[12] = (FLAC__byte)((min_framesize >> 16) & 0xFF); data[13] = (FLAC__byte)((min_framesize >> 8 ) & 0xFF); data[14] = (FLAC__byte)((min_framesize ) & 0xFF); data[15] = (FLAC__byte)((max_framesize >> 16) & 0xFF); data[16] = (FLAC__byte)((max_framesize >> 8 ) & 0xFF); data[17] = (FLAC__byte)((max_framesize ) & 0xFF); flacenc->first_buf = NULL; gst_pad_push (flacenc->srcpad, outbuf); } } static void gst_flacenc_chain (GstPad *pad, GstBuffer *buf) { FlacEnc *flacenc; FLAC__int32 *data; gulong insize; gint samples, depth; gulong i; FLAC__bool res; g_return_if_fail(buf != NULL); flacenc = GST_FLACENC (gst_pad_get_parent (pad)); if (GST_IS_EVENT (buf)) { GstEvent *event = GST_EVENT (buf); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_EOS: FLAC__stream_encoder_finish(flacenc->encoder); default: gst_pad_event_default (pad, event); break; } return; } if (!flacenc->negotiated) { gst_element_error (GST_ELEMENT (flacenc), "format not negotiated"); return; } depth = flacenc->depth; insize = GST_BUFFER_SIZE (buf); samples = insize / ((depth+7)>>3); if (FLAC__stream_encoder_get_state (flacenc->encoder) == FLAC__STREAM_ENCODER_UNINITIALIZED) { FLAC__StreamEncoderState state; state = FLAC__stream_encoder_init (flacenc->encoder); if (state != FLAC__STREAM_ENCODER_OK) { gst_element_error (GST_ELEMENT (flacenc), "could not initialize encoder (wrong parameters?)"); return; } } /* we keep a pointer in the flacenc struct because we are freeing the data * after a push opreration that might never return */ data = flacenc->data = g_malloc (samples * sizeof (FLAC__int32)); if (depth == 8) { gint8 *indata = (gint8 *) GST_BUFFER_DATA (buf); for (i=0; iencoder, (const FLAC__int32 *) data, samples / flacenc->channels); g_free (flacenc->data); flacenc->data = NULL; if (!res) { gst_element_error (GST_ELEMENT (flacenc), "encoding error"); } } static void gst_flacenc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { FlacEnc *this; this = (FlacEnc *)object; switch (prop_id) { case ARG_QUALITY: gst_flacenc_update_quality (this, g_value_get_enum (value)); break; case ARG_STREAMABLE_SUBSET: FLAC__stream_encoder_set_streamable_subset (this->encoder, g_value_get_boolean (value)); break; case ARG_MID_SIDE_STEREO: FLAC__stream_encoder_set_do_mid_side_stereo (this->encoder, g_value_get_boolean (value)); break; case ARG_LOOSE_MID_SIDE_STEREO: FLAC__stream_encoder_set_loose_mid_side_stereo (this->encoder, g_value_get_boolean (value)); break; case ARG_BLOCKSIZE: FLAC__stream_encoder_set_blocksize (this->encoder, g_value_get_uint (value)); break; case ARG_MAX_LPC_ORDER: FLAC__stream_encoder_set_max_lpc_order (this->encoder, g_value_get_uint (value)); break; case ARG_QLP_COEFF_PRECISION: FLAC__stream_encoder_set_qlp_coeff_precision (this->encoder, g_value_get_uint (value)); break; case ARG_QLP_COEFF_PREC_SEARCH: FLAC__stream_encoder_set_do_qlp_coeff_prec_search (this->encoder, g_value_get_boolean (value)); break; case ARG_ESCAPE_CODING: FLAC__stream_encoder_set_do_escape_coding (this->encoder, g_value_get_boolean (value)); break; case ARG_EXHAUSTIVE_MODEL_SEARCH: FLAC__stream_encoder_set_do_exhaustive_model_search (this->encoder, g_value_get_boolean (value)); break; case ARG_MIN_RESIDUAL_PARTITION_ORDER: FLAC__stream_encoder_set_min_residual_partition_order (this->encoder, g_value_get_uint (value)); break; case ARG_MAX_RESIDUAL_PARTITION_ORDER: FLAC__stream_encoder_set_max_residual_partition_order (this->encoder, g_value_get_uint (value)); break; case ARG_RICE_PARAMETER_SEARCH_DIST: FLAC__stream_encoder_set_rice_parameter_search_dist (this->encoder, g_value_get_uint (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); return; } } static void gst_flacenc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { FlacEnc *this; this = (FlacEnc *)object; switch (prop_id) { case ARG_QUALITY: g_value_set_enum (value, this->quality); break; case ARG_STREAMABLE_SUBSET: g_value_set_boolean (value, FLAC__stream_encoder_get_streamable_subset (this->encoder)); break; case ARG_MID_SIDE_STEREO: g_value_set_boolean (value, FLAC__stream_encoder_get_do_mid_side_stereo (this->encoder)); break; case ARG_LOOSE_MID_SIDE_STEREO: g_value_set_boolean (value, FLAC__stream_encoder_get_loose_mid_side_stereo (this->encoder)); break; case ARG_BLOCKSIZE: g_value_set_uint (value, FLAC__stream_encoder_get_blocksize (this->encoder)); break; case ARG_MAX_LPC_ORDER: g_value_set_uint (value, FLAC__stream_encoder_get_max_lpc_order (this->encoder)); break; case ARG_QLP_COEFF_PRECISION: g_value_set_uint (value, FLAC__stream_encoder_get_qlp_coeff_precision (this->encoder)); break; case ARG_QLP_COEFF_PREC_SEARCH: g_value_set_boolean (value, FLAC__stream_encoder_get_do_qlp_coeff_prec_search (this->encoder)); break; case ARG_ESCAPE_CODING: g_value_set_boolean (value, FLAC__stream_encoder_get_do_escape_coding (this->encoder)); break; case ARG_EXHAUSTIVE_MODEL_SEARCH: g_value_set_boolean (value, FLAC__stream_encoder_get_do_exhaustive_model_search (this->encoder)); break; case ARG_MIN_RESIDUAL_PARTITION_ORDER: g_value_set_uint (value, FLAC__stream_encoder_get_min_residual_partition_order (this->encoder)); break; case ARG_MAX_RESIDUAL_PARTITION_ORDER: g_value_set_uint (value, FLAC__stream_encoder_get_max_residual_partition_order (this->encoder)); break; case ARG_RICE_PARAMETER_SEARCH_DIST: g_value_set_uint (value, FLAC__stream_encoder_get_rice_parameter_search_dist (this->encoder)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstElementStateReturn gst_flacenc_change_state (GstElement *element) { FlacEnc *flacenc = GST_FLACENC (element); switch (GST_STATE_TRANSITION (element)) { case GST_STATE_NULL_TO_READY: case GST_STATE_READY_TO_PAUSED: flacenc->first = TRUE; flacenc->stopped = FALSE; break; case GST_STATE_PAUSED_TO_PLAYING: case GST_STATE_PLAYING_TO_PAUSED: break; case GST_STATE_PAUSED_TO_READY: if (FLAC__stream_encoder_get_state (flacenc->encoder) != FLAC__STREAM_ENCODER_UNINITIALIZED) { flacenc->stopped = TRUE; FLAC__stream_encoder_finish (flacenc->encoder); } flacenc->negotiated = FALSE; if (flacenc->first_buf) gst_buffer_unref (flacenc->first_buf); flacenc->first_buf = NULL; g_free (flacenc->data); flacenc->data = NULL; break; case GST_STATE_READY_TO_NULL: default: break; } if (GST_ELEMENT_CLASS (parent_class)->change_state) return GST_ELEMENT_CLASS (parent_class)->change_state (element); return GST_STATE_SUCCESS; }