gstreamer/gst/matroska/ebml-read.c
Tim-Philipp Müller 5c4b6ce079 Make stuff compile with GST_DISABLE_GST_DEBUG.
Original commit message from CVS:
* ext/raw1394/gsthdv1394src.c: (gst_hdv1394src_create):
* gst/alpha/gstalpha.c: (gst_alpha_get_unit_size):
* gst/audiofx/audiocheblimit.c: (generate_coefficients):
* gst/avi/gstavidemux.c: (gst_avi_demux_src_convert):
* gst/matroska/ebml-read.c: (gst_ebml_read_element_id),
(gst_ebml_read_element_length):
* gst/matroska/matroska-demux.c:
(gst_matroska_demux_check_subtitle_buffer):
Make stuff compile with GST_DISABLE_GST_DEBUG.
2008-08-30 14:15:03 +00:00

999 lines
22 KiB
C

/* GStreamer EBML I/O
* (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* ebml-read.c: read EBML data from file/stream
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/floatcast/floatcast.h>
#include "ebml-read.h"
#include "ebml-ids.h"
#include <math.h>
/* NAN is supposed to be in math.h, Microsoft defines it in xmath.h */
#ifdef _MSC_VER
#include <xmath.h>
#endif
/* If everything goes wrong try 0.0/0.0 which should be NAN */
#ifndef NAN
#define NAN (0.0 / 0.0)
#endif
GST_DEBUG_CATEGORY_STATIC (ebmlread_debug);
#define GST_CAT_DEFAULT ebmlread_debug
static void gst_ebml_read_class_init (GstEbmlReadClass * klass);
static void gst_ebml_read_init (GstEbmlRead * ebml);
static GstStateChangeReturn gst_ebml_read_change_state (GstElement * element,
GstStateChange transition);
/* convenience functions */
static GstFlowReturn gst_ebml_read_peek_bytes (GstEbmlRead * ebml, guint size,
GstBuffer ** p_buf, guint8 ** bytes);
static GstFlowReturn gst_ebml_read_pull_bytes (GstEbmlRead * ebml, guint size,
GstBuffer ** p_buf, guint8 ** bytes);
static GstElementClass *parent_class; /* NULL */
GType
gst_ebml_read_get_type (void)
{
static GType gst_ebml_read_type; /* 0 */
if (!gst_ebml_read_type) {
static const GTypeInfo gst_ebml_read_info = {
sizeof (GstEbmlReadClass),
NULL,
NULL,
(GClassInitFunc) gst_ebml_read_class_init,
NULL,
NULL,
sizeof (GstEbmlRead),
0,
(GInstanceInitFunc) gst_ebml_read_init,
};
gst_ebml_read_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstEbmlRead",
&gst_ebml_read_info, 0);
}
return gst_ebml_read_type;
}
void
gst_ebml_level_free (GstEbmlLevel * level)
{
g_slice_free (GstEbmlLevel, level);
}
static void
gst_ebml_finalize (GObject * obj)
{
GstEbmlRead *ebml = GST_EBML_READ (obj);
g_list_foreach (ebml->level, (GFunc) gst_ebml_level_free, NULL);
g_list_free (ebml->level);
ebml->level = NULL;
if (ebml->cached_buffer) {
gst_buffer_unref (ebml->cached_buffer);
ebml->cached_buffer = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
static void
gst_ebml_read_class_init (GstEbmlReadClass * klass)
{
GstElementClass *gstelement_class = (GstElementClass *) klass;
GObjectClass *gobject_class = (GObjectClass *) klass;
parent_class = g_type_class_peek_parent (klass);
GST_DEBUG_CATEGORY_INIT (ebmlread_debug, "ebmlread",
0, "EBML stream helper class");
gobject_class->finalize = gst_ebml_finalize;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_ebml_read_change_state);
}
static void
gst_ebml_read_init (GstEbmlRead * ebml)
{
ebml->sinkpad = NULL;
ebml->level = NULL;
}
static GstStateChangeReturn
gst_ebml_read_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstEbmlRead *ebml = GST_EBML_READ (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
if (!ebml->sinkpad) {
g_return_val_if_reached (GST_STATE_CHANGE_FAILURE);
}
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
{
g_list_foreach (ebml->level, (GFunc) gst_ebml_level_free, NULL);
g_list_free (ebml->level);
ebml->level = NULL;
if (ebml->cached_buffer) {
gst_buffer_unref (ebml->cached_buffer);
ebml->cached_buffer = NULL;
}
ebml->offset = 0;
break;
}
default:
break;
}
return ret;
}
/*
* Return: the amount of levels in the hierarchy that the
* current element lies higher than the previous one.
* The opposite isn't done - that's auto-done using master
* element reading.
*/
static guint
gst_ebml_read_element_level_up (GstEbmlRead * ebml)
{
guint num = 0;
guint64 pos = ebml->offset;
while (ebml->level != NULL) {
GstEbmlLevel *level = ebml->level->data;
if (pos >= level->start + level->length) {
ebml->level = g_list_delete_link (ebml->level, ebml->level);
gst_ebml_level_free (level);
num++;
} else {
break;
}
}
return num;
}
/*
* Calls pull_range for (offset,size) without advancing our offset
*/
static GstFlowReturn
gst_ebml_read_peek_bytes (GstEbmlRead * ebml, guint size, GstBuffer ** p_buf,
guint8 ** bytes)
{
GstFlowReturn ret;
/* Caching here actually makes much less difference than one would expect.
* We do it mainly to avoid pulling buffers of 1 byte all the time */
if (ebml->cached_buffer) {
guint64 cache_offset = GST_BUFFER_OFFSET (ebml->cached_buffer);
guint cache_size = GST_BUFFER_SIZE (ebml->cached_buffer);
if (cache_offset <= ebml->offset &&
(ebml->offset + size) < (cache_offset + cache_size)) {
if (p_buf)
*p_buf = gst_buffer_create_sub (ebml->cached_buffer,
ebml->offset - cache_offset, size);
if (bytes)
*bytes =
GST_BUFFER_DATA (ebml->cached_buffer) + ebml->offset - cache_offset;
return GST_FLOW_OK;
}
/* not enough data in the cache, free cache and get a new one */
gst_buffer_unref (ebml->cached_buffer);
ebml->cached_buffer = NULL;
}
/* refill the cache */
ret = gst_pad_pull_range (ebml->sinkpad, ebml->offset, MAX (size, 64 * 1024),
&ebml->cached_buffer);
if (ret != GST_FLOW_OK) {
ebml->cached_buffer = NULL;
return ret;
}
if (GST_BUFFER_SIZE (ebml->cached_buffer) >= size) {
if (p_buf)
*p_buf = gst_buffer_create_sub (ebml->cached_buffer, 0, size);
if (bytes)
*bytes = GST_BUFFER_DATA (ebml->cached_buffer);
return GST_FLOW_OK;
}
/* Not possible to get enough data, try a last time with
* requesting exactly the size we need */
gst_buffer_unref (ebml->cached_buffer);
ebml->cached_buffer = NULL;
ret =
gst_pad_pull_range (ebml->sinkpad, ebml->offset, size,
&ebml->cached_buffer);
if (ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (ebml, "pull_range returned %d", ret);
if (p_buf)
*p_buf = NULL;
if (bytes)
*bytes = NULL;
return ret;
}
if (GST_BUFFER_SIZE (ebml->cached_buffer) < size) {
GST_WARNING_OBJECT (ebml, "Dropping short buffer at offset %"
G_GUINT64_FORMAT ": wanted %u bytes, got %u bytes", ebml->offset,
size, GST_BUFFER_SIZE (ebml->cached_buffer));
gst_buffer_unref (ebml->cached_buffer);
ebml->cached_buffer = NULL;
if (p_buf)
*p_buf = NULL;
if (bytes)
*bytes = NULL;
return GST_FLOW_UNEXPECTED;
}
if (p_buf)
*p_buf = gst_buffer_create_sub (ebml->cached_buffer, 0, size);
if (bytes)
*bytes = GST_BUFFER_DATA (*p_buf);
return GST_FLOW_OK;
}
/*
* Calls pull_range for (offset,size) and advances our offset by size
*/
static GstFlowReturn
gst_ebml_read_pull_bytes (GstEbmlRead * ebml, guint size, GstBuffer ** p_buf,
guint8 ** bytes)
{
GstFlowReturn ret;
ret = gst_ebml_read_peek_bytes (ebml, size, p_buf, bytes);
if (ret != GST_FLOW_OK)
return ret;
ebml->offset += size;
return GST_FLOW_OK;
}
/*
* Read: the element content data ID.
* Return: FALSE on error.
*/
static GstFlowReturn
gst_ebml_read_element_id (GstEbmlRead * ebml, guint32 * id, guint * level_up)
{
guint8 *buf;
gint len_mask = 0x80, read = 1, n = 1;
guint32 total;
guint8 b;
GstFlowReturn ret;
ret = gst_ebml_read_peek_bytes (ebml, 1, NULL, &buf);
if (ret != GST_FLOW_OK)
return ret;
b = GST_READ_UINT8 (buf);
total = (guint32) b;
while (read <= 4 && !(total & len_mask)) {
read++;
len_mask >>= 1;
}
if (read > 4) {
GST_ERROR_OBJECT (ebml,
"Invalid EBML ID size tag (0x%x) at position %" G_GUINT64_FORMAT " (0x%"
G_GINT64_MODIFIER "x)", (guint) b, ebml->offset, ebml->offset);
return GST_FLOW_ERROR;
}
ret = gst_ebml_read_peek_bytes (ebml, read, NULL, &buf);
if (ret != GST_FLOW_OK)
return ret;
while (n < read) {
b = GST_READ_UINT8 (buf + n);
total = (total << 8) | b;
++n;
}
*id = total;
/* level */
if (level_up)
*level_up = gst_ebml_read_element_level_up (ebml);
ebml->offset += read;
return GST_FLOW_OK;
}
/*
* Read: element content length.
* Return: the number of bytes read or -1 on error.
*/
static GstFlowReturn
gst_ebml_read_element_length (GstEbmlRead * ebml, guint64 * length,
gint * rread)
{
GstFlowReturn ret;
guint8 *buf;
gint len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
guint64 total;
guint8 b;
ret = gst_ebml_read_peek_bytes (ebml, 1, NULL, &buf);
if (ret != GST_FLOW_OK)
return ret;
b = GST_READ_UINT8 (buf);
total = (guint64) b;
while (read <= 8 && !(total & len_mask)) {
read++;
len_mask >>= 1;
}
if (read > 8) {
GST_ERROR_OBJECT (ebml,
"Invalid EBML length size tag (0x%x) at position %" G_GUINT64_FORMAT
" (0x%" G_GINT64_MODIFIER "x)", (guint) b, ebml->offset, ebml->offset);
return GST_FLOW_ERROR;
}
if ((total &= (len_mask - 1)) == len_mask - 1)
num_ffs++;
ret = gst_ebml_read_peek_bytes (ebml, read, NULL, &buf);
if (ret != GST_FLOW_OK)
return ret;
while (n < read) {
guint8 b = GST_READ_UINT8 (buf + n);
if (b == 0xff)
num_ffs++;
total = (total << 8) | b;
++n;
}
if (read == num_ffs)
*length = G_MAXUINT64;
else
*length = total;
if (rread)
*rread = read;
ebml->offset += read;
return GST_FLOW_OK;
}
/*
* Return: the ID of the next element.
* Level_up contains the amount of levels that this
* next element lies higher than the previous one.
*/
GstFlowReturn
gst_ebml_peek_id (GstEbmlRead * ebml, guint * level_up, guint32 * id)
{
guint64 off;
guint level_up_tmp = 0;
GstFlowReturn ret;
g_assert (level_up);
g_assert (id);
*level_up = 0;
next:
off = ebml->offset; /* save offset */
if ((ret = gst_ebml_read_element_id (ebml, id, &level_up_tmp)) != GST_FLOW_OK)
return ret;
ebml->offset = off; /* restore offset */
*level_up += level_up_tmp;
level_up_tmp = 0;
switch (*id) {
case GST_EBML_ID_VOID:
GST_DEBUG_OBJECT (ebml, "Skipping EBML Void element");
if ((ret = gst_ebml_read_skip (ebml)) != GST_FLOW_OK)
return ret;
goto next;
break;
case GST_EBML_ID_CRC32:
GST_DEBUG_OBJECT (ebml, "Skipping EBML CRC32 element");
if ((ret = gst_ebml_read_skip (ebml)) != GST_FLOW_OK)
return ret;
goto next;
break;
}
return ret;
}
/*
* Return the length of the stream in bytes
*/
gint64
gst_ebml_read_get_length (GstEbmlRead * ebml)
{
GstFormat fmt = GST_FORMAT_BYTES;
gint64 end;
/* FIXME: what to do if we don't get the upstream length */
if (!gst_pad_query_peer_duration (ebml->sinkpad, &fmt, &end) ||
fmt != GST_FORMAT_BYTES || end < 0)
g_return_val_if_reached (0);
return end;
}
/*
* Seek to a given offset.
*/
GstFlowReturn
gst_ebml_read_seek (GstEbmlRead * ebml, guint64 offset)
{
if (offset >= gst_ebml_read_get_length (ebml))
return GST_FLOW_UNEXPECTED;
ebml->offset = offset;
return GST_FLOW_OK;
}
/*
* Skip the next element.
*/
GstFlowReturn
gst_ebml_read_skip (GstEbmlRead * ebml)
{
guint64 length;
guint32 id;
GstFlowReturn ret;
ret = gst_ebml_read_element_id (ebml, &id, NULL);
if (ret != GST_FLOW_OK)
return ret;
ret = gst_ebml_read_element_length (ebml, &length, NULL);
if (ret != GST_FLOW_OK)
return ret;
ebml->offset += length;
return ret;
}
/*
* Read the next element as a GstBuffer (binary).
*/
GstFlowReturn
gst_ebml_read_buffer (GstEbmlRead * ebml, guint32 * id, GstBuffer ** buf)
{
guint64 length;
GstFlowReturn ret;
ret = gst_ebml_read_element_id (ebml, id, NULL);
if (ret != GST_FLOW_OK)
return ret;
ret = gst_ebml_read_element_length (ebml, &length, NULL);
if (ret != GST_FLOW_OK)
return ret;
if (length == 0) {
*buf = gst_buffer_new ();
return GST_FLOW_OK;
}
*buf = NULL;
ret = gst_ebml_read_pull_bytes (ebml, (guint) length, buf, NULL);
return ret;
}
/*
* Read the next element, return a pointer to it and its size.
*/
static GstFlowReturn
gst_ebml_read_bytes (GstEbmlRead * ebml, guint32 * id, guint8 ** data,
guint * size)
{
guint64 length;
GstFlowReturn ret;
*size = 0;
ret = gst_ebml_read_element_id (ebml, id, NULL);
if (ret != GST_FLOW_OK)
return ret;
ret = gst_ebml_read_element_length (ebml, &length, NULL);
if (ret != GST_FLOW_OK)
return ret;
if (length == 0) {
*data = NULL;
return ret;
}
*data = NULL;
ret = gst_ebml_read_pull_bytes (ebml, (guint) length, NULL, data);
if (ret != GST_FLOW_OK)
return ret;
*size = (guint) length;
return ret;
}
/*
* Read the next element as an unsigned int.
*/
GstFlowReturn
gst_ebml_read_uint (GstEbmlRead * ebml, guint32 * id, guint64 * num)
{
guint8 *data;
guint size;
GstFlowReturn ret;
ret = gst_ebml_read_bytes (ebml, id, &data, &size);
if (ret != GST_FLOW_OK)
return ret;
if (size < 1 || size > 8) {
GST_ERROR_OBJECT (ebml,
"Invalid integer element size %d at position %" G_GUINT64_FORMAT " (0x%"
G_GINT64_MODIFIER "x)", size, ebml->offset - size, ebml->offset - size);
return GST_FLOW_ERROR;
}
*num = 0;
while (size > 0) {
*num = (*num << 8) | *data;
size--;
data++;
}
return ret;
}
/*
* Read the next element as a signed int.
*/
GstFlowReturn
gst_ebml_read_sint (GstEbmlRead * ebml, guint32 * id, gint64 * num)
{
guint8 *data;
guint size;
gboolean negative = 0;
GstFlowReturn ret;
ret = gst_ebml_read_bytes (ebml, id, &data, &size);
if (ret != GST_FLOW_OK)
return ret;
if (size < 1 || size > 8) {
GST_ERROR_OBJECT (ebml,
"Invalid integer element size %d at position %" G_GUINT64_FORMAT " (0x%"
G_GINT64_MODIFIER "x)", size, ebml->offset - size, ebml->offset - size);
return GST_FLOW_ERROR;
}
*num = 0;
if (*data & 0x80) {
negative = 1;
*num = *data & ~0x80;
size--;
data++;
}
while (size > 0) {
*num = (*num << 8) | *data;
size--;
data++;
}
/* make signed */
if (negative) {
*num = 0 - *num;
}
return ret;
}
/* Convert 80 bit extended precision float in big endian format to double.
* Code taken from libavutil/intfloat_readwrite.c from ffmpeg,
* licensed under LGPL */
struct _ext_float
{
guint8 exponent[2];
guint8 mantissa[8];
};
static gdouble
_ext2dbl (guint8 * data)
{
struct _ext_float ext;
guint64 m = 0;
gint e, i;
memcpy (&ext.exponent, data, 2);
memcpy (&ext.mantissa, data + 2, 8);
for (i = 0; i < 8; i++)
m = (m << 8) + ext.mantissa[i];
e = (((gint) ext.exponent[0] & 0x7f) << 8) | ext.exponent[1];
if (e == 0x7fff && m)
return NAN;
e -= 16383 + 63; /* In IEEE 80 bits, the whole (i.e. 1.xxxx)
* mantissa bit is written as opposed to the
* single and double precision formats */
if (ext.exponent[0] & 0x80)
m = -m;
return ldexp (m, e);
}
/*
* Read the next element as a float.
*/
GstFlowReturn
gst_ebml_read_float (GstEbmlRead * ebml, guint32 * id, gdouble * num)
{
guint8 *data;
guint size;
GstFlowReturn ret;
ret = gst_ebml_read_bytes (ebml, id, &data, &size);
if (ret != GST_FLOW_OK)
return ret;
if (size != 4 && size != 8 && size != 10) {
GST_ERROR_OBJECT (ebml,
"Invalid float element size %d at position %" G_GUINT64_FORMAT " (0x%"
G_GINT64_MODIFIER "x)", size, ebml->offset - size, ebml->offset - size);
return GST_FLOW_ERROR;
}
if (size == 4) {
gfloat f;
memcpy (&f, data, 4);
f = GFLOAT_FROM_BE (f);
*num = f;
} else if (size == 8) {
gdouble d;
memcpy (&d, data, 8);
d = GDOUBLE_FROM_BE (d);
*num = d;
} else {
*num = _ext2dbl (data);
}
return ret;
}
/*
* Read the next element as an ASCII string.
*/
GstFlowReturn
gst_ebml_read_ascii (GstEbmlRead * ebml, guint32 * id, gchar ** str)
{
guint8 *data;
guint size;
GstFlowReturn ret;
ret = gst_ebml_read_bytes (ebml, id, &data, &size);
if (ret != GST_FLOW_OK)
return ret;
*str = g_malloc (size + 1);
memcpy (*str, data, size);
(*str)[size] = '\0';
return ret;
}
/*
* Read the next element as a UTF-8 string.
*/
GstFlowReturn
gst_ebml_read_utf8 (GstEbmlRead * ebml, guint32 * id, gchar ** str)
{
GstFlowReturn ret;
#ifndef GST_DISABLE_GST_DEBUG
guint64 oldoff = ebml->offset;
#endif
ret = gst_ebml_read_ascii (ebml, id, str);
if (ret != GST_FLOW_OK)
return ret;
if (str != NULL && *str != NULL && **str != '\0' &&
!g_utf8_validate (*str, -1, NULL)) {
GST_WARNING_OBJECT (ebml,
"Invalid UTF-8 string at offset %" G_GUINT64_FORMAT, oldoff);
}
return ret;
}
/*
* Read the next element as a date.
* Returns the seconds since the unix epoch.
*/
GstFlowReturn
gst_ebml_read_date (GstEbmlRead * ebml, guint32 * id, gint64 * date)
{
gint64 ebml_date;
GstFlowReturn ret;
ret = gst_ebml_read_sint (ebml, id, &ebml_date);
if (ret != GST_FLOW_OK)
return ret;
*date = (ebml_date / GST_SECOND) + GST_EBML_DATE_OFFSET;
return ret;
}
/*
* Read the next element, but only the header. The contents
* are supposed to be sub-elements which can be read separately.
*/
GstFlowReturn
gst_ebml_read_master (GstEbmlRead * ebml, guint32 * id)
{
GstEbmlLevel *level;
guint64 length;
GstFlowReturn ret;
ret = gst_ebml_read_element_id (ebml, id, NULL);
if (ret != GST_FLOW_OK)
return ret;
ret = gst_ebml_read_element_length (ebml, &length, NULL);
if (ret != GST_FLOW_OK)
return ret;
/* remember level */
level = g_slice_new (GstEbmlLevel);
level->start = ebml->offset;
level->length = length;
ebml->level = g_list_prepend (ebml->level, level);
return GST_FLOW_OK;
}
/*
* Read the next element as binary data.
*/
GstFlowReturn
gst_ebml_read_binary (GstEbmlRead * ebml,
guint32 * id, guint8 ** binary, guint64 * length)
{
guint8 *data;
guint size;
GstFlowReturn ret;
ret = gst_ebml_read_bytes (ebml, id, &data, &size);
if (ret != GST_FLOW_OK)
return ret;
*length = size;
*binary = g_memdup (data, size);
return GST_FLOW_OK;
}
/*
* Read an EBML header.
*/
GstFlowReturn
gst_ebml_read_header (GstEbmlRead * ebml, gchar ** doctype, guint * version)
{
/* this function is the first to be called */
guint32 id;
guint level_up;
GstFlowReturn ret;
/* default init */
if (doctype)
*doctype = NULL;
if (version)
*version = 1;
ret = gst_ebml_peek_id (ebml, &level_up, &id);
if (ret != GST_FLOW_OK)
return ret;
GST_DEBUG_OBJECT (ebml, "id: %08x", GST_READ_UINT32_BE (&id));
if (level_up != 0 || id != GST_EBML_ID_HEADER) {
GST_ERROR_OBJECT (ebml, "Failed to read header");
return GST_FLOW_ERROR;
}
ret = gst_ebml_read_master (ebml, &id);
if (ret != GST_FLOW_OK)
return ret;
while (TRUE) {
ret = gst_ebml_peek_id (ebml, &level_up, &id);
if (ret != GST_FLOW_OK)
return ret;
/* end-of-header */
if (level_up)
break;
switch (id) {
/* is our read version uptodate? */
case GST_EBML_ID_EBMLREADVERSION:{
guint64 num;
ret = gst_ebml_read_uint (ebml, &id, &num);
if (ret != GST_FLOW_OK)
return ret;
g_assert (id == GST_EBML_ID_EBMLREADVERSION);
if (num != GST_EBML_VERSION) {
GST_ERROR_OBJECT (ebml, "Unsupported EBML version %" G_GUINT64_FORMAT,
num);
return GST_FLOW_ERROR;
}
GST_DEBUG_OBJECT (ebml, "EbmlReadVersion: %" G_GUINT64_FORMAT, num);
break;
}
/* we only handle 8 byte lengths at max */
case GST_EBML_ID_EBMLMAXSIZELENGTH:{
guint64 num;
ret = gst_ebml_read_uint (ebml, &id, &num);
if (ret != GST_FLOW_OK)
return ret;
g_assert (id == GST_EBML_ID_EBMLMAXSIZELENGTH);
if (num > sizeof (guint64)) {
GST_ERROR_OBJECT (ebml,
"Unsupported EBML maximum size %" G_GUINT64_FORMAT, num);
return GST_FLOW_ERROR;
}
GST_DEBUG_OBJECT (ebml, "EbmlMaxSizeLength: %" G_GUINT64_FORMAT, num);
break;
}
/* we handle 4 byte IDs at max */
case GST_EBML_ID_EBMLMAXIDLENGTH:{
guint64 num;
ret = gst_ebml_read_uint (ebml, &id, &num);
if (ret != GST_FLOW_OK)
return ret;
g_assert (id == GST_EBML_ID_EBMLMAXIDLENGTH);
if (num > sizeof (guint32)) {
GST_ERROR_OBJECT (ebml,
"Unsupported EBML maximum ID %" G_GUINT64_FORMAT, num);
return GST_FLOW_ERROR;
}
GST_DEBUG_OBJECT (ebml, "EbmlMaxIdLength: %" G_GUINT64_FORMAT, num);
break;
}
case GST_EBML_ID_DOCTYPE:{
gchar *text;
ret = gst_ebml_read_ascii (ebml, &id, &text);
if (ret != GST_FLOW_OK)
return ret;
g_assert (id == GST_EBML_ID_DOCTYPE);
GST_DEBUG_OBJECT (ebml, "EbmlDocType: %s", GST_STR_NULL (text));
if (doctype) {
g_free (*doctype);
*doctype = text;
} else
g_free (text);
break;
}
case GST_EBML_ID_DOCTYPEREADVERSION:{
guint64 num;
ret = gst_ebml_read_uint (ebml, &id, &num);
if (ret != GST_FLOW_OK)
return ret;
g_assert (id == GST_EBML_ID_DOCTYPEREADVERSION);
if (version)
*version = num;
GST_DEBUG_OBJECT (ebml, "EbmlReadVersion: %" G_GUINT64_FORMAT, num);
break;
}
default:
GST_WARNING_OBJECT (ebml,
"Unknown data type 0x%x in EBML header (ignored)", id);
/* pass-through */
/* we ignore these two, as they don't tell us anything we care about */
case GST_EBML_ID_EBMLVERSION:
case GST_EBML_ID_DOCTYPEVERSION:
ret = gst_ebml_read_skip (ebml);
if (ret != GST_FLOW_OK)
return ret;
break;
}
}
return GST_FLOW_OK;
}