diff options
Diffstat (limited to 'audio/gstsbcdec.c')
| -rw-r--r-- | audio/gstsbcdec.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/audio/gstsbcdec.c b/audio/gstsbcdec.c new file mode 100644 index 00000000..43a40f44 --- /dev/null +++ b/audio/gstsbcdec.c @@ -0,0 +1,223 @@ +/* + * + * BlueZ - Bluetooth protocol stack for Linux + * + * Copyright (C) 2004-2008 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 "gstsbcdec.h" + +GST_DEBUG_CATEGORY_STATIC(sbc_dec_debug); +#define GST_CAT_DEFAULT sbc_dec_debug + +GST_BOILERPLATE(GstSbcDec, gst_sbc_dec, GstElement, GST_TYPE_ELEMENT); + +static const GstElementDetails sbc_dec_details = + GST_ELEMENT_DETAILS("Bluetooth SBC decoder", + "Codec/Decoder/Audio", + "Decode a SBC audio stream", + "Marcel Holtmann <marcel@holtmann.org>"); + +static GstStaticPadTemplate sbc_dec_sink_factory = + GST_STATIC_PAD_TEMPLATE("sink", GST_PAD_SINK, GST_PAD_ALWAYS, + GST_STATIC_CAPS("audio/x-sbc")); + +static GstStaticPadTemplate sbc_dec_src_factory = + GST_STATIC_PAD_TEMPLATE("src", GST_PAD_SRC, GST_PAD_ALWAYS, + GST_STATIC_CAPS("audio/x-raw-int, " + "rate = (int) { 16000, 32000, 44100, 48000 }, " + "channels = (int) [ 1, 2 ], " + "endianness = (int) LITTLE_ENDIAN, " + "signed = (boolean) true, " + "width = (int) 16, " + "depth = (int) 16")); + +static GstFlowReturn sbc_dec_chain(GstPad *pad, GstBuffer *buffer) +{ + GstSbcDec *dec = GST_SBC_DEC(gst_pad_get_parent(pad)); + GstFlowReturn res = GST_FLOW_OK; + guint size, codesize, offset = 0; + guint8 *data; + GstClockTime timestamp; + + codesize = sbc_get_codesize(&dec->sbc); + timestamp = GST_BUFFER_TIMESTAMP(buffer); + + if (dec->buffer) { + GstBuffer *temp = buffer; + buffer = gst_buffer_span(dec->buffer, 0, buffer, + GST_BUFFER_SIZE(dec->buffer) + GST_BUFFER_SIZE(buffer)); + gst_buffer_unref(temp); + gst_buffer_unref(dec->buffer); + dec->buffer = NULL; + } + + data = GST_BUFFER_DATA(buffer); + size = GST_BUFFER_SIZE(buffer); + + while (offset < size) { + GstBuffer *output; + GstPadTemplate *template; + GstCaps *caps; + int consumed; + + res = gst_pad_alloc_buffer_and_set_caps(dec->srcpad, + GST_BUFFER_OFFSET_NONE, + codesize, NULL, &output); + + if (res != GST_FLOW_OK) + goto done; + + consumed = sbc_decode(&dec->sbc, data + offset, size - offset, + GST_BUFFER_DATA(output), codesize, + NULL); + if (consumed <= 0) + break; + + /* we will reuse the same caps object */ + if (dec->outcaps == NULL) { + caps = gst_caps_new_simple("audio/x-raw-int", + "rate", G_TYPE_INT, + gst_sbc_parse_rate_from_sbc( + dec->sbc.frequency), + "channels", G_TYPE_INT, + gst_sbc_get_channel_number( + dec->sbc.mode), + NULL); + + template = gst_static_pad_template_get(&sbc_dec_src_factory); + + dec->outcaps = gst_caps_intersect(caps, + gst_pad_template_get_caps(template)); + + gst_caps_unref(caps); + } + + gst_buffer_set_caps(output, dec->outcaps); + + /* FIXME get a real timestamp */ + GST_BUFFER_TIMESTAMP(output) = GST_CLOCK_TIME_NONE; + + res = gst_pad_push(dec->srcpad, output); + if (res != GST_FLOW_OK) + goto done; + + offset += consumed; + } + + if (offset < size) + dec->buffer = gst_buffer_create_sub(buffer, + offset, size - offset); + +done: + gst_buffer_unref(buffer); + gst_object_unref(dec); + + return res; +} + +static GstStateChangeReturn sbc_dec_change_state(GstElement *element, + GstStateChange transition) +{ + GstSbcDec *dec = GST_SBC_DEC(element); + + switch (transition) { + case GST_STATE_CHANGE_READY_TO_PAUSED: + GST_DEBUG("Setup subband codec"); + if (dec->buffer) { + gst_buffer_unref(dec->buffer); + dec->buffer = NULL; + } + sbc_init(&dec->sbc, 0); + dec->outcaps = NULL; + break; + + case GST_STATE_CHANGE_PAUSED_TO_READY: + GST_DEBUG("Finish subband codec"); + if (dec->buffer) { + gst_buffer_unref(dec->buffer); + dec->buffer = NULL; + } + sbc_finish(&dec->sbc); + if (dec->outcaps) { + gst_caps_unref(dec->outcaps); + dec->outcaps = NULL; + } + break; + + default: + break; + } + + return parent_class->change_state(element, transition); +} + +static void gst_sbc_dec_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_dec_sink_factory)); + + gst_element_class_add_pad_template(element_class, + gst_static_pad_template_get(&sbc_dec_src_factory)); + + gst_element_class_set_details(element_class, &sbc_dec_details); +} + +static void gst_sbc_dec_class_init(GstSbcDecClass *klass) +{ + GstElementClass *element_class = GST_ELEMENT_CLASS(klass); + + parent_class = g_type_class_peek_parent(klass); + + element_class->change_state = GST_DEBUG_FUNCPTR(sbc_dec_change_state); + + GST_DEBUG_CATEGORY_INIT(sbc_dec_debug, "sbcdec", 0, + "SBC decoding element"); +} + +static void gst_sbc_dec_init(GstSbcDec *self, GstSbcDecClass *klass) +{ + self->sinkpad = gst_pad_new_from_static_template( + &sbc_dec_sink_factory, "sink"); + gst_pad_set_chain_function(self->sinkpad, GST_DEBUG_FUNCPTR( + sbc_dec_chain)); + gst_element_add_pad(GST_ELEMENT(self), self->sinkpad); + + self->srcpad = gst_pad_new_from_static_template( + &sbc_dec_src_factory, "src"); + gst_element_add_pad(GST_ELEMENT(self), self->srcpad); + + self->outcaps = NULL; +} + +gboolean gst_sbc_dec_plugin_init (GstPlugin * plugin) +{ + return gst_element_register (plugin, "sbcdec", + GST_RANK_PRIMARY, GST_TYPE_SBC_DEC); +} + + |