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/* GStreamer Musepack decoder plugin
* Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstmusepackreader.h"
#include <gst/gst.h>
#include <string.h>
GST_DEBUG_CATEGORY_EXTERN (musepackdec_debug);
#define GST_CAT_DEFAULT musepackdec_debug
static mpc_int32_t gst_musepack_reader_peek (mpc_reader * this, void *ptr,
mpc_int32_t size);
static mpc_int32_t gst_musepack_reader_read (mpc_reader * this, void *ptr,
mpc_int32_t size);
static mpc_bool_t gst_musepack_reader_seek (mpc_reader * this,
mpc_int32_t offset);
static mpc_int32_t gst_musepack_reader_tell (mpc_reader * this);
static mpc_int32_t gst_musepack_reader_get_size (mpc_reader * this);
static mpc_bool_t gst_musepack_reader_canseek (mpc_reader * this);
static mpc_int32_t
gst_musepack_reader_peek (mpc_reader * this, void *ptr, mpc_int32_t size)
{
GstMusepackDec *musepackdec = GST_MUSEPACK_DEC (this->data);
GstFlowReturn flow_ret;
GstBuffer *buf = NULL;
guint read;
g_return_val_if_fail (size > 0, 0);
/* GST_LOG_OBJECT (musepackdec, "size=%d", size); */
flow_ret = gst_pad_pull_range (musepackdec->sinkpad, musepackdec->offset,
size, &buf);
if (flow_ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (musepackdec, "Flow: %s", gst_flow_get_name (flow_ret));
return 0;
}
read = MIN (gst_buffer_get_size (buf), size);
if (read < size) {
GST_WARNING_OBJECT (musepackdec, "Short read: got only %u bytes of %u "
"bytes requested at offset %" G_GINT64_FORMAT, read, size,
musepackdec->offset);
/* GST_ELEMENT_ERROR (musepackdec, RESOURCE, READ, (NULL), (NULL)); */
}
gst_buffer_extract (buf, 0, ptr, read);
gst_buffer_unref (buf);
return read;
}
static mpc_int32_t
gst_musepack_reader_read (mpc_reader * this, void *ptr, mpc_int32_t size)
{
GstMusepackDec *musepackdec = GST_MUSEPACK_DEC (this->data);
gint read;
/* read = peek + flush */
if ((read = gst_musepack_reader_peek (this, ptr, size)) > 0) {
musepackdec->offset += read;
}
return read;
}
static mpc_bool_t
gst_musepack_reader_seek (mpc_reader * this, mpc_int32_t offset)
{
GstMusepackDec *musepackdec = GST_MUSEPACK_DEC (this->data);
mpc_int32_t length;
length = gst_musepack_reader_get_size (this);
if (length > 0 && offset >= 0 && offset < length) {
musepackdec->offset = offset;
GST_LOG_OBJECT (musepackdec, "Seek'ed to byte offset %d", (gint) offset);
return TRUE;
} else {
GST_DEBUG_OBJECT (musepackdec, "Cannot seek to offset %d", (gint) offset);
return FALSE;
}
}
static mpc_int32_t
gst_musepack_reader_tell (mpc_reader * this)
{
GstMusepackDec *musepackdec = GST_MUSEPACK_DEC (this->data);
return musepackdec->offset;
}
static mpc_int32_t
gst_musepack_reader_get_size (mpc_reader * this)
{
GstMusepackDec *dec = GST_MUSEPACK_DEC (this->data);
GstQuery *query;
GstFormat format;
gint64 length;
query = gst_query_new_duration (GST_FORMAT_BYTES);
if (gst_pad_peer_query (dec->sinkpad, query))
gst_query_parse_duration (query, &format, &length);
else
length = -1;
return (mpc_int32_t) length;
}
static mpc_bool_t
gst_musepack_reader_canseek (mpc_reader * this)
{
return TRUE;
}
void
gst_musepack_init_reader (mpc_reader * r, GstMusepackDec * musepackdec)
{
r->data = musepackdec;
r->read = gst_musepack_reader_read;
r->seek = gst_musepack_reader_seek;
r->tell = gst_musepack_reader_tell;
r->get_size = gst_musepack_reader_get_size;
r->canseek = gst_musepack_reader_canseek;
}
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