diff options
Diffstat (limited to 'audio/gstsbcparse.c')
| -rw-r--r-- | audio/gstsbcparse.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/audio/gstsbcparse.c b/audio/gstsbcparse.c new file mode 100644 index 0000000..a44b52c --- /dev/null +++ b/audio/gstsbcparse.c @@ -0,0 +1,220 @@ +/* + * + * BlueZ - Bluetooth protocol stack for Linux + * + * Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org> + * + * + * 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 + +#include <string.h> + +#include "gstpragma.h" +#include "gstsbcutil.h" +#include "gstsbcparse.h" + +GST_DEBUG_CATEGORY_STATIC(sbc_parse_debug); +#define GST_CAT_DEFAULT sbc_parse_debug + +GST_BOILERPLATE(GstSbcParse, gst_sbc_parse, GstElement, GST_TYPE_ELEMENT); + +static const GstElementDetails sbc_parse_details = + GST_ELEMENT_DETAILS("Bluetooth SBC parser", + "Codec/Parser/Audio", + "Parse a SBC audio stream", + "Marcel Holtmann <marcel@holtmann.org>"); + +static GstStaticPadTemplate sbc_parse_sink_factory = + GST_STATIC_PAD_TEMPLATE("sink", GST_PAD_SINK, GST_PAD_ALWAYS, + GST_STATIC_CAPS("audio/x-sbc," + "parsed = (boolean) false")); + +static GstStaticPadTemplate sbc_parse_src_factory = + GST_STATIC_PAD_TEMPLATE("src", GST_PAD_SRC, GST_PAD_ALWAYS, + GST_STATIC_CAPS("audio/x-sbc, " + "rate = (int) { 16000, 32000, 44100, 48000 }, " + "channels = (int) [ 1, 2 ], " + "mode = (string) { \"mono\", \"dual\", \"stereo\", \"joint\" }, " + "blocks = (int) { 4, 8, 12, 16 }, " + "subbands = (int) { 4, 8 }, " + "allocation = (string) { \"snr\", \"loudness\" }," + "bitpool = (int) [ 2, 64 ]," + "parsed = (boolean) true")); + +static GstFlowReturn sbc_parse_chain(GstPad *pad, GstBuffer *buffer) +{ + GstSbcParse *parse = GST_SBC_PARSE(gst_pad_get_parent(pad)); + GstFlowReturn res = GST_FLOW_OK; + guint size, offset = 0; + guint8 *data; + + /* FIXME use a gstadpter */ + if (parse->buffer) { + GstBuffer *temp; + temp = buffer; + buffer = gst_buffer_span(parse->buffer, 0, buffer, + GST_BUFFER_SIZE(parse->buffer) + + GST_BUFFER_SIZE(buffer)); + gst_buffer_unref(parse->buffer); + gst_buffer_unref(temp); + parse->buffer = NULL; + } + + data = GST_BUFFER_DATA(buffer); + size = GST_BUFFER_SIZE(buffer); + + while (offset < size) { + GstBuffer *output; + int consumed; + + consumed = sbc_parse(&parse->new_sbc, data + offset, + size - offset); + if (consumed <= 0) + break; + + if (parse->first_parsing || (memcmp(&parse->sbc, + &parse->new_sbc, sizeof(sbc_t)) != 0)) { + + memcpy(&parse->sbc, &parse->new_sbc, sizeof(sbc_t)); + if (parse->outcaps != NULL) + gst_caps_unref(parse->outcaps); + + parse->outcaps = gst_sbc_parse_caps_from_sbc( + &parse->sbc); + + parse->first_parsing = FALSE; + } + + res = gst_pad_alloc_buffer_and_set_caps(parse->srcpad, + GST_BUFFER_OFFSET_NONE, + consumed, parse->outcaps, &output); + + if (res != GST_FLOW_OK) + goto done; + + memcpy(GST_BUFFER_DATA(output), data + offset, consumed); + + res = gst_pad_push(parse->srcpad, output); + if (res != GST_FLOW_OK) + goto done; + + offset += consumed; + } + + if (offset < size) + parse->buffer = gst_buffer_create_sub(buffer, + offset, size - offset); + +done: + gst_buffer_unref(buffer); + gst_object_unref(parse); + + return res; +} + +static GstStateChangeReturn sbc_parse_change_state(GstElement *element, + GstStateChange transition) +{ + GstSbcParse *parse = GST_SBC_PARSE(element); + + switch (transition) { + case GST_STATE_CHANGE_READY_TO_PAUSED: + GST_DEBUG("Setup subband codec"); + + parse->channels = -1; + parse->rate = -1; + parse->first_parsing = TRUE; + + sbc_init(&parse->sbc, 0); + break; + + case GST_STATE_CHANGE_PAUSED_TO_READY: + GST_DEBUG("Finish subband codec"); + + if (parse->buffer) { + gst_buffer_unref(parse->buffer); + parse->buffer = NULL; + } + if (parse->outcaps != NULL) { + gst_caps_unref(parse->outcaps); + parse->outcaps = NULL; + } + + sbc_finish(&parse->sbc); + break; + + default: + break; + } + + return parent_class->change_state(element, transition); +} + +static void gst_sbc_parse_base_init(gpointer g_class) +{ + GstElementClass *element_class = GST_ELEMENT_CLASS(g_class); + + gst_element_class_add_pad_template(element_class, + gst_static_pad_template_get(&sbc_parse_sink_factory)); + + gst_element_class_add_pad_template(element_class, + gst_static_pad_template_get(&sbc_parse_src_factory)); + + gst_element_class_set_details(element_class, &sbc_parse_details); +} + +static void gst_sbc_parse_class_init(GstSbcParseClass *klass) +{ + GstElementClass *element_class = GST_ELEMENT_CLASS(klass); + + parent_class = g_type_class_peek_parent(klass); + + element_class->change_state = GST_DEBUG_FUNCPTR(sbc_parse_change_state); + + GST_DEBUG_CATEGORY_INIT(sbc_parse_debug, "sbcparse", 0, + "SBC parsing element"); +} + +static void gst_sbc_parse_init(GstSbcParse *self, GstSbcParseClass *klass) +{ + self->sinkpad = gst_pad_new_from_static_template( + &sbc_parse_sink_factory, "sink"); + gst_pad_set_chain_function(self->sinkpad, + GST_DEBUG_FUNCPTR(sbc_parse_chain)); + gst_element_add_pad(GST_ELEMENT(self), self->sinkpad); + + self->srcpad = gst_pad_new_from_static_template( + &sbc_parse_src_factory, "src"); + gst_element_add_pad(GST_ELEMENT(self), self->srcpad); + + self->outcaps = NULL; + self->buffer = NULL; + self->channels = -1; + self->rate = -1; + self->first_parsing = TRUE; +} + +gboolean gst_sbc_parse_plugin_init(GstPlugin *plugin) +{ + return gst_element_register(plugin, "sbcparse", GST_RANK_NONE, + GST_TYPE_SBC_PARSE); +} + |