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171 lines
5.8 KiB
C
171 lines
5.8 KiB
C
/* GStreamer EBML I/O
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* (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* ebml-read.c: read EBML data from file/stream
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_EBML_READ_H__
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#define __GST_EBML_READ_H__
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#include <gst/gst.h>
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#include <gst/base/gstbytereader.h>
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G_BEGIN_DECLS
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#define GST_TYPE_EBML_READ \
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(gst_ebml_read_get_type ())
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#define GST_EBML_READ(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_EBML_READ, GstEbmlRead))
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#define GST_EBML_READ_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_EBML_READ, GstEbmlReadClass))
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#define GST_IS_EBML_READ(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_EBML_READ))
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#define GST_IS_EBML_READ_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_EBML_READ))
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#define GST_EBML_READ_GET_CLASS(obj) \
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(G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_EBML_READ, GstEbmlReadClass))
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GST_DEBUG_CATEGORY_EXTERN (ebmlread_debug);
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/* custom flow return code */
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#define GST_FLOW_PARSE GST_FLOW_CUSTOM_ERROR
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typedef struct _GstEbmlMaster {
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guint64 offset;
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GstByteReader br;
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} GstEbmlMaster;
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typedef struct _GstEbmlRead {
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GstElement *el;
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GstBuffer *buf;
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guint64 offset;
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GstMapInfo map;
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GArray *readers;
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} GstEbmlRead;
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typedef GstFlowReturn (*GstPeekData) (gpointer * context, guint peek, const guint8 ** data);
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/* returns UNEXPECTED if not enough data */
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GstFlowReturn gst_ebml_peek_id_length (guint32 * _id, guint64 * _length,
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guint * _needed,
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GstPeekData peek, gpointer * ctx,
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GstElement * el, guint64 offset);
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void gst_ebml_read_init (GstEbmlRead * ebml,
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GstElement * el, GstBuffer * buf,
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guint64 offset);
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void gst_ebml_read_clear (GstEbmlRead * ebml);
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GstFlowReturn gst_ebml_peek_id (GstEbmlRead * ebml, guint32 * id);
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/* return _PARSE if not enough data to read what is needed, _ERROR or _OK */
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GstFlowReturn gst_ebml_read_skip (GstEbmlRead *ebml);
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GstFlowReturn gst_ebml_read_buffer (GstEbmlRead *ebml,
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guint32 *id,
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GstBuffer **buf);
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GstFlowReturn gst_ebml_read_uint (GstEbmlRead *ebml,
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guint32 *id,
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guint64 *num);
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GstFlowReturn gst_ebml_read_sint (GstEbmlRead *ebml,
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guint32 *id,
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gint64 *num);
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GstFlowReturn gst_ebml_read_float (GstEbmlRead *ebml,
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guint32 *id,
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gdouble *num);
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GstFlowReturn gst_ebml_read_ascii (GstEbmlRead *ebml,
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guint32 *id,
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gchar **str);
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GstFlowReturn gst_ebml_read_utf8 (GstEbmlRead *ebml,
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guint32 *id,
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gchar **str);
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GstFlowReturn gst_ebml_read_date (GstEbmlRead *ebml,
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guint32 *id,
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gint64 *date);
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GstFlowReturn gst_ebml_read_master (GstEbmlRead *ebml,
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guint32 *id);
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GstFlowReturn gst_ebml_read_pop_master (GstEbmlRead *ebml);
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GstFlowReturn gst_ebml_read_binary (GstEbmlRead *ebml,
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guint32 *id,
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guint8 **binary,
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guint64 *length);
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GstFlowReturn gst_ebml_read_header (GstEbmlRead *read,
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gchar **doctype,
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guint *version);
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/* Returns current (absolute) position of Ebml parser,
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* i.e. taking into account offset provided at init */
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static inline guint64
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gst_ebml_read_get_pos (GstEbmlRead * ebml)
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{
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GstEbmlMaster *m;
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g_return_val_if_fail (ebml->readers, 0);
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g_return_val_if_fail (ebml->readers->len, 0);
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m = &(g_array_index (ebml->readers, GstEbmlMaster, ebml->readers->len - 1));
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return m->offset + gst_byte_reader_get_pos (&m->br);
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}
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/* Returns starting offset of Ebml parser */
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static inline guint64
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gst_ebml_read_get_offset (GstEbmlRead * ebml)
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{
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return ebml->offset;
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}
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static inline GstByteReader *
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gst_ebml_read_br (GstEbmlRead * ebml)
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{
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g_return_val_if_fail (ebml->readers, NULL);
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g_return_val_if_fail (ebml->readers->len, NULL);
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return &(g_array_index (ebml->readers,
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GstEbmlMaster, ebml->readers->len - 1).br);
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}
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static inline gboolean
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gst_ebml_read_has_remaining (GstEbmlRead * ebml, guint64 bytes_needed,
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gboolean auto_pop)
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{
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gboolean res;
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res = (gst_byte_reader_get_remaining (gst_ebml_read_br (ebml)) >= bytes_needed);
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if (G_LIKELY (!res && auto_pop)) {
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gst_ebml_read_pop_master (ebml);
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}
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return G_LIKELY (res);
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}
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G_END_DECLS
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#endif /* __GST_EBML_READ_H__ */
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