gstreamer/gst/quicktime/descriptors.c

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/* Quicktime muxer plugin for GStreamer
* Copyright (C) 2008 Thiago Sousa Santos <thiagoss@embedded.ufcg.edu.br>
*
* 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.
*/
/*
* Unless otherwise indicated, Source Code is licensed under MIT license.
* See further explanation attached in License Statement (distributed in the file
* LICENSE).
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "descriptors.h"
/*
* Some mp4 structures (descriptors) use a coding scheme for
* representing its size.
* It is grouped in bytes. The 1st bit set to 1 means we need another byte,
* 0 otherwise. The remaining 7 bits are the useful values.
*
* The next set of functions handle those values
*/
/*
* Gets an unsigned integer and packs it into a 'expandable size' format
* (as used by mp4 descriptors)
* @size: the integer to be parsed
* @ptr: the array to place the result
* @array_size: the size of ptr array
*/
static void
expandable_size_parse (guint64 size, guint8 * ptr, guint32 array_size)
{
int index = 0;
memset (ptr, 0, sizeof (array_size));
while (size > 0 && index < array_size) {
ptr[index++] = (size > 0x7F ? 0x80 : 0x0) | (size & 0x7F);
size = size >> 7;
}
}
/*
* Gets how many positions in an array holding an 'expandable size'
* are really used
*
* @ptr: the array with the 'expandable size'
* @array_size: the size of ptr array
*
* Returns: the number of really used positions
*/
static guint64
expandable_size_get_length (guint8 * ptr, guint32 array_size)
{
gboolean next = TRUE;
guint32 index = 0;
while (next && index < array_size) {
next = ((ptr[index] & 0x80) == 1);
index++;
}
return index;
}
/*
* Initializers below
*/
static void
desc_base_descriptor_init (BaseDescriptor * bd, guint8 tag, guint32 size)
{
bd->tag = tag;
expandable_size_parse (size, bd->size, 4);
}
static void
desc_dec_specific_info_init (DecoderSpecificInfoDescriptor * dsid)
{
desc_base_descriptor_init (&dsid->base, DECODER_SPECIFIC_INFO_TAG, 0);
dsid->length = 0;
dsid->data = NULL;
}
DecoderSpecificInfoDescriptor *
desc_dec_specific_info_new (void)
{
DecoderSpecificInfoDescriptor *desc =
g_new0 (DecoderSpecificInfoDescriptor, 1);
desc_dec_specific_info_init (desc);
return desc;
}
static void
desc_dec_conf_desc_init (DecoderConfigDescriptor * dcd)
{
desc_base_descriptor_init (&dcd->base, DECODER_CONFIG_DESC_TAG, 0);
dcd->dec_specific_info = NULL;
}
static void
desc_sl_conf_desc_init (SLConfigDescriptor * sl)
{
desc_base_descriptor_init (&sl->base, SL_CONFIG_DESC_TAG, 0);
sl->predefined = 0x2;
}
void
desc_es_init (ESDescriptor * es)
{
desc_base_descriptor_init (&es->base, ES_DESCRIPTOR_TAG, 0);
es->id = 0;
es->flags = 0;
es->depends_on_es_id = 0;
es->ocr_es_id = 0;
es->url_length = 0;
es->url_string = NULL;
desc_dec_conf_desc_init (&es->dec_conf_desc);
desc_sl_conf_desc_init (&es->sl_conf_desc);
}
ESDescriptor *
desc_es_descriptor_new (void)
{
ESDescriptor *es = g_new0 (ESDescriptor, 1);
desc_es_init (es);
return es;
}
/*
* Deinitializers/Destructors below
*/
static void
desc_base_descriptor_clear (BaseDescriptor * base)
{
}
void
desc_dec_specific_info_free (DecoderSpecificInfoDescriptor * dsid)
{
desc_base_descriptor_clear (&dsid->base);
if (dsid->data) {
g_free (dsid->data);
dsid->data = NULL;
}
g_free (dsid);
}
static void
desc_dec_conf_desc_clear (DecoderConfigDescriptor * dec)
{
desc_base_descriptor_clear (&dec->base);
if (dec->dec_specific_info) {
desc_dec_specific_info_free (dec->dec_specific_info);
}
}
static void
desc_sl_config_descriptor_clear (SLConfigDescriptor * sl)
{
desc_base_descriptor_clear (&sl->base);
}
void
desc_es_descriptor_clear (ESDescriptor * es)
{
desc_base_descriptor_clear (&es->base);
if (es->url_string) {
g_free (es->url_string);
es->url_string = NULL;
}
desc_dec_conf_desc_clear (&es->dec_conf_desc);
desc_sl_config_descriptor_clear (&es->sl_conf_desc);
}
/*
* Size handling functions below
*/
void
desc_dec_specific_info_alloc_data (DecoderSpecificInfoDescriptor * dsid,
guint32 size)
{
if (dsid->data) {
g_free (dsid->data);
}
dsid->data = g_new0 (guint8, size);
dsid->length = size;
}
static void
desc_base_descriptor_set_size (BaseDescriptor * bd, guint32 size)
{
expandable_size_parse (size, bd->size, 4);
}
static guint64
desc_base_descriptor_get_size (BaseDescriptor * bd)
{
guint64 size = 0;
size += sizeof (guint8);
size += expandable_size_get_length (bd->size, 4) * sizeof (guint8);
return size;
}
static guint64
desc_sl_config_descriptor_get_size (SLConfigDescriptor * sl_desc)
{
guint64 size = 0;
guint64 extra_size = 0;
size += desc_base_descriptor_get_size (&sl_desc->base);
/* predefined */
extra_size += sizeof (guint8);
desc_base_descriptor_set_size (&sl_desc->base, extra_size);
return size + extra_size;
}
static guint64
desc_dec_specific_info_get_size (DecoderSpecificInfoDescriptor * dsid)
{
guint64 size = 0;
guint64 extra_size = 0;
size += desc_base_descriptor_get_size (&dsid->base);
extra_size += sizeof (guint8) * dsid->length;
desc_base_descriptor_set_size (&dsid->base, extra_size);
return size + extra_size;
}
static guint64
desc_dec_config_descriptor_get_size (DecoderConfigDescriptor * dec_desc)
{
guint64 size = 0;
guint64 extra_size = 0;
size += desc_base_descriptor_get_size (&dec_desc->base);
/* object type */
extra_size += sizeof (guint8);
/* stream type */
extra_size += sizeof (guint8);
/* buffer size */
extra_size += sizeof (guint8) * 3;
/* max bitrate */
extra_size += sizeof (guint32);
/* avg bitrate */
extra_size += sizeof (guint32);
if (dec_desc->dec_specific_info) {
extra_size += desc_dec_specific_info_get_size (dec_desc->dec_specific_info);
}
desc_base_descriptor_set_size (&dec_desc->base, extra_size);
return size + extra_size;
}
static guint64
desc_es_descriptor_get_size (ESDescriptor * es)
{
guint64 size = 0;
guint64 extra_size = 0;
size += desc_base_descriptor_get_size (&es->base);
/* id */
extra_size += sizeof (guint16);
/* flags */
extra_size += sizeof (guint8);
/* depends_on_es_id */
if (es->flags & 0x80) {
extra_size += sizeof (guint16);
}
if (es->flags & 0x40) {
/* url_length */
extra_size += sizeof (guint8);
/* url */
extra_size += sizeof (gchar) * es->url_length;
}
if (es->flags & 0x20) {
/* ocr_es_id */
extra_size += sizeof (guint16);
}
extra_size += desc_dec_config_descriptor_get_size (&es->dec_conf_desc);
extra_size += desc_sl_config_descriptor_get_size (&es->sl_conf_desc);
desc_base_descriptor_set_size (&es->base, extra_size);
return size + extra_size;
}
static gboolean
desc_es_descriptor_check_stream_dependency (ESDescriptor * es)
{
return es->flags & 0x80;
}
static gboolean
desc_es_descriptor_check_url_flag (ESDescriptor * es)
{
return es->flags & 0x40;
}
static gboolean
desc_es_descriptor_check_ocr (ESDescriptor * es)
{
return es->flags & 0x20;
}
/* Copy/Serializations Functions below */
static guint64
desc_base_descriptor_copy_data (BaseDescriptor * desc, guint8 ** buffer,
guint64 * size, guint64 * offset)
{
guint64 original_offset = *offset;
prop_copy_uint8 (desc->tag, buffer, size, offset);
prop_copy_uint8_array (desc->size, expandable_size_get_length (desc->size, 4),
buffer, size, offset);
return original_offset - *offset;
}
static guint64
desc_sl_config_descriptor_copy_data (SLConfigDescriptor * desc,
guint8 ** buffer, guint64 * size, guint64 * offset)
{
guint64 original_offset = *offset;
if (!desc_base_descriptor_copy_data (&desc->base, buffer, size, offset)) {
return 0;
}
/* predefined attribute */
prop_copy_uint8 (desc->predefined, buffer, size, offset);
return *offset - original_offset;
}
static guint64
desc_dec_specific_info_copy_data (DecoderSpecificInfoDescriptor * desc,
guint8 ** buffer, guint64 * size, guint64 * offset)
{
guint64 original_offset = *offset;
if (!desc_base_descriptor_copy_data (&desc->base, buffer, size, offset)) {
return 0;
}
prop_copy_uint8_array (desc->data, desc->length, buffer, size, offset);
return *offset - original_offset;
}
static guint64
desc_dec_config_descriptor_copy_data (DecoderConfigDescriptor * desc,
guint8 ** buffer, guint64 * size, guint64 * offset)
{
guint64 original_offset = *offset;
if (!desc_base_descriptor_copy_data (&desc->base, buffer, size, offset)) {
return 0;
}
prop_copy_uint8 (desc->object_type, buffer, size, offset);
prop_copy_uint8 (desc->stream_type, buffer, size, offset);
prop_copy_uint8_array (desc->buffer_size_DB, 3, buffer, size, offset);
prop_copy_uint32 (desc->max_bitrate, buffer, size, offset);
prop_copy_uint32 (desc->avg_bitrate, buffer, size, offset);
if (desc->dec_specific_info) {
if (!desc_dec_specific_info_copy_data (desc->dec_specific_info, buffer,
size, offset)) {
return 0;
}
}
return *offset - original_offset;
}
guint64
desc_es_descriptor_copy_data (ESDescriptor * desc, guint8 ** buffer,
guint64 * size, guint64 * offset)
{
guint64 desc_size;
guint64 original_offset = *offset;
/* must call this twice to have size fields of all contained descriptors set
* correctly, and to have the size of the size fields taken into account */
desc_size = desc_es_descriptor_get_size (desc);
desc_size = desc_es_descriptor_get_size (desc);
if (!desc_base_descriptor_copy_data (&desc->base, buffer, size, offset)) {
return 0;
}
/* id and flags */
prop_copy_uint16 (desc->id, buffer, size, offset);
prop_copy_uint8 (desc->flags, buffer, size, offset);
if (desc_es_descriptor_check_stream_dependency (desc)) {
prop_copy_uint16 (desc->depends_on_es_id, buffer, size, offset);
}
if (desc_es_descriptor_check_url_flag (desc)) {
prop_copy_size_string (desc->url_string, desc->url_length, buffer, size,
offset);
}
if (desc_es_descriptor_check_ocr (desc)) {
prop_copy_uint16 (desc->ocr_es_id, buffer, size, offset);
}
if (!desc_dec_config_descriptor_copy_data (&desc->dec_conf_desc, buffer, size,
offset)) {
return 0;
}
if (!desc_sl_config_descriptor_copy_data (&desc->sl_conf_desc, buffer, size,
offset)) {
return 0;
}
return *offset - original_offset;
}