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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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GCC 4.6.x spits warnings about such variable usage. Note that some calculations are left as comments for informative purposes.
457 lines
12 KiB
C
457 lines
12 KiB
C
/* Quicktime muxer plugin for GStreamer
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* Copyright (C) 2008 Thiago Sousa Santos <thiagoss@embedded.ufcg.edu.br>
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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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/*
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* Unless otherwise indicated, Source Code is licensed under MIT license.
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* See further explanation attached in License Statement (distributed in the file
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* LICENSE).
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "descriptors.h"
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/*
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* Some mp4 structures (descriptors) use a coding scheme for
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* representing its size.
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* It is grouped in bytes. The 1st bit set to 1 means we need another byte,
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* 0 otherwise. The remaining 7 bits are the useful values.
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*
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* The next set of functions handle those values
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*/
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/*
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* Gets an unsigned integer and packs it into a 'expandable size' format
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* (as used by mp4 descriptors)
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* @size: the integer to be parsed
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* @ptr: the array to place the result
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* @array_size: the size of ptr array
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*/
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static void
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expandable_size_parse (guint64 size, guint8 * ptr, guint32 array_size)
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{
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int index = 0;
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memset (ptr, 0, sizeof (array_size));
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while (size > 0 && index < array_size) {
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ptr[index++] = (size > 0x7F ? 0x80 : 0x0) | (size & 0x7F);
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size = size >> 7;
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}
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}
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/*
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* Gets how many positions in an array holding an 'expandable size'
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* are really used
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*
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* @ptr: the array with the 'expandable size'
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* @array_size: the size of ptr array
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*
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* Returns: the number of really used positions
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*/
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static guint64
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expandable_size_get_length (guint8 * ptr, guint32 array_size)
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{
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gboolean next = TRUE;
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guint32 index = 0;
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while (next && index < array_size) {
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next = ((ptr[index] & 0x80) == 1);
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index++;
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}
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return index;
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}
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/*
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* Initializers below
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*/
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static void
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desc_base_descriptor_init (BaseDescriptor * bd, guint8 tag, guint32 size)
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{
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bd->tag = tag;
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expandable_size_parse (size, bd->size, 4);
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}
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static void
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desc_dec_specific_info_init (DecoderSpecificInfoDescriptor * dsid)
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{
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desc_base_descriptor_init (&dsid->base, DECODER_SPECIFIC_INFO_TAG, 0);
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dsid->length = 0;
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dsid->data = NULL;
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}
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DecoderSpecificInfoDescriptor *
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desc_dec_specific_info_new (void)
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{
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DecoderSpecificInfoDescriptor *desc =
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g_new0 (DecoderSpecificInfoDescriptor, 1);
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desc_dec_specific_info_init (desc);
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return desc;
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}
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static void
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desc_dec_conf_desc_init (DecoderConfigDescriptor * dcd)
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{
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desc_base_descriptor_init (&dcd->base, DECODER_CONFIG_DESC_TAG, 0);
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dcd->dec_specific_info = NULL;
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}
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static void
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desc_sl_conf_desc_init (SLConfigDescriptor * sl)
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{
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desc_base_descriptor_init (&sl->base, SL_CONFIG_DESC_TAG, 0);
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sl->predefined = 0x2;
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}
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void
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desc_es_init (ESDescriptor * es)
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{
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desc_base_descriptor_init (&es->base, ES_DESCRIPTOR_TAG, 0);
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es->id = 0;
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es->flags = 0;
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es->depends_on_es_id = 0;
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es->ocr_es_id = 0;
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es->url_length = 0;
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es->url_string = NULL;
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desc_dec_conf_desc_init (&es->dec_conf_desc);
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desc_sl_conf_desc_init (&es->sl_conf_desc);
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}
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ESDescriptor *
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desc_es_descriptor_new (void)
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{
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ESDescriptor *es = g_new0 (ESDescriptor, 1);
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desc_es_init (es);
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return es;
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}
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/*
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* Deinitializers/Destructors below
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*/
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static void
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desc_base_descriptor_clear (BaseDescriptor * base)
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{
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}
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void
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desc_dec_specific_info_free (DecoderSpecificInfoDescriptor * dsid)
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{
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desc_base_descriptor_clear (&dsid->base);
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if (dsid->data) {
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g_free (dsid->data);
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dsid->data = NULL;
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}
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g_free (dsid);
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}
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static void
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desc_dec_conf_desc_clear (DecoderConfigDescriptor * dec)
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{
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desc_base_descriptor_clear (&dec->base);
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if (dec->dec_specific_info) {
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desc_dec_specific_info_free (dec->dec_specific_info);
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}
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}
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static void
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desc_sl_config_descriptor_clear (SLConfigDescriptor * sl)
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{
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desc_base_descriptor_clear (&sl->base);
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}
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void
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desc_es_descriptor_clear (ESDescriptor * es)
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{
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desc_base_descriptor_clear (&es->base);
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if (es->url_string) {
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g_free (es->url_string);
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es->url_string = NULL;
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}
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desc_dec_conf_desc_clear (&es->dec_conf_desc);
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desc_sl_config_descriptor_clear (&es->sl_conf_desc);
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}
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/*
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* Size handling functions below
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*/
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void
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desc_dec_specific_info_alloc_data (DecoderSpecificInfoDescriptor * dsid,
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guint32 size)
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{
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if (dsid->data) {
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g_free (dsid->data);
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}
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dsid->data = g_new0 (guint8, size);
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dsid->length = size;
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}
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static void
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desc_base_descriptor_set_size (BaseDescriptor * bd, guint32 size)
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{
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expandable_size_parse (size, bd->size, 4);
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}
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static guint64
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desc_base_descriptor_get_size (BaseDescriptor * bd)
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{
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guint64 size = 0;
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size += sizeof (guint8);
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size += expandable_size_get_length (bd->size, 4) * sizeof (guint8);
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return size;
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}
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static guint64
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desc_sl_config_descriptor_get_size (SLConfigDescriptor * sl_desc)
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{
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guint64 size = 0;
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guint64 extra_size = 0;
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size += desc_base_descriptor_get_size (&sl_desc->base);
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/* predefined */
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extra_size += sizeof (guint8);
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desc_base_descriptor_set_size (&sl_desc->base, extra_size);
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return size + extra_size;
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}
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static guint64
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desc_dec_specific_info_get_size (DecoderSpecificInfoDescriptor * dsid)
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{
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guint64 size = 0;
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guint64 extra_size = 0;
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size += desc_base_descriptor_get_size (&dsid->base);
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extra_size += sizeof (guint8) * dsid->length;
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desc_base_descriptor_set_size (&dsid->base, extra_size);
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return size + extra_size;
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}
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static guint64
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desc_dec_config_descriptor_get_size (DecoderConfigDescriptor * dec_desc)
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{
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guint64 size = 0;
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guint64 extra_size = 0;
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size += desc_base_descriptor_get_size (&dec_desc->base);
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/* object type */
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extra_size += sizeof (guint8);
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/* stream type */
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extra_size += sizeof (guint8);
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/* buffer size */
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extra_size += sizeof (guint8) * 3;
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/* max bitrate */
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extra_size += sizeof (guint32);
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/* avg bitrate */
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extra_size += sizeof (guint32);
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if (dec_desc->dec_specific_info) {
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extra_size += desc_dec_specific_info_get_size (dec_desc->dec_specific_info);
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}
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desc_base_descriptor_set_size (&dec_desc->base, extra_size);
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return size + extra_size;
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}
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static guint64
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desc_es_descriptor_get_size (ESDescriptor * es)
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{
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guint64 size = 0;
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guint64 extra_size = 0;
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size += desc_base_descriptor_get_size (&es->base);
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/* id */
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extra_size += sizeof (guint16);
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/* flags */
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extra_size += sizeof (guint8);
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/* depends_on_es_id */
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if (es->flags & 0x80) {
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extra_size += sizeof (guint16);
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}
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if (es->flags & 0x40) {
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/* url_length */
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extra_size += sizeof (guint8);
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/* url */
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extra_size += sizeof (gchar) * es->url_length;
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}
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if (es->flags & 0x20) {
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/* ocr_es_id */
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extra_size += sizeof (guint16);
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}
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extra_size += desc_dec_config_descriptor_get_size (&es->dec_conf_desc);
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extra_size += desc_sl_config_descriptor_get_size (&es->sl_conf_desc);
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desc_base_descriptor_set_size (&es->base, extra_size);
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return size + extra_size;
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}
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static gboolean
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desc_es_descriptor_check_stream_dependency (ESDescriptor * es)
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{
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return es->flags & 0x80;
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}
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static gboolean
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desc_es_descriptor_check_url_flag (ESDescriptor * es)
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{
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return es->flags & 0x40;
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}
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static gboolean
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desc_es_descriptor_check_ocr (ESDescriptor * es)
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{
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return es->flags & 0x20;
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}
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/* Copy/Serializations Functions below */
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static guint64
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desc_base_descriptor_copy_data (BaseDescriptor * desc, guint8 ** buffer,
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guint64 * size, guint64 * offset)
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{
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guint64 original_offset = *offset;
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prop_copy_uint8 (desc->tag, buffer, size, offset);
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prop_copy_uint8_array (desc->size, expandable_size_get_length (desc->size, 4),
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buffer, size, offset);
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return original_offset - *offset;
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}
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static guint64
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desc_sl_config_descriptor_copy_data (SLConfigDescriptor * desc,
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guint8 ** buffer, guint64 * size, guint64 * offset)
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{
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guint64 original_offset = *offset;
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if (!desc_base_descriptor_copy_data (&desc->base, buffer, size, offset)) {
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return 0;
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}
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/* predefined attribute */
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prop_copy_uint8 (desc->predefined, buffer, size, offset);
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return *offset - original_offset;
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}
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static guint64
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desc_dec_specific_info_copy_data (DecoderSpecificInfoDescriptor * desc,
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guint8 ** buffer, guint64 * size, guint64 * offset)
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{
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guint64 original_offset = *offset;
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if (!desc_base_descriptor_copy_data (&desc->base, buffer, size, offset)) {
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return 0;
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}
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prop_copy_uint8_array (desc->data, desc->length, buffer, size, offset);
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return *offset - original_offset;
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}
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static guint64
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desc_dec_config_descriptor_copy_data (DecoderConfigDescriptor * desc,
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guint8 ** buffer, guint64 * size, guint64 * offset)
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{
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guint64 original_offset = *offset;
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if (!desc_base_descriptor_copy_data (&desc->base, buffer, size, offset)) {
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return 0;
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}
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prop_copy_uint8 (desc->object_type, buffer, size, offset);
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prop_copy_uint8 (desc->stream_type, buffer, size, offset);
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prop_copy_uint8_array (desc->buffer_size_DB, 3, buffer, size, offset);
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prop_copy_uint32 (desc->max_bitrate, buffer, size, offset);
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prop_copy_uint32 (desc->avg_bitrate, buffer, size, offset);
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if (desc->dec_specific_info) {
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if (!desc_dec_specific_info_copy_data (desc->dec_specific_info, buffer,
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size, offset)) {
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return 0;
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}
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}
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return *offset - original_offset;
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}
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guint64
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desc_es_descriptor_copy_data (ESDescriptor * desc, guint8 ** buffer,
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guint64 * size, guint64 * offset)
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{
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guint64 original_offset = *offset;
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/* must call this twice to have size fields of all contained descriptors set
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* correctly, and to have the size of the size fields taken into account */
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desc_es_descriptor_get_size (desc);
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desc_es_descriptor_get_size (desc);
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if (!desc_base_descriptor_copy_data (&desc->base, buffer, size, offset)) {
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return 0;
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}
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/* id and flags */
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prop_copy_uint16 (desc->id, buffer, size, offset);
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prop_copy_uint8 (desc->flags, buffer, size, offset);
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if (desc_es_descriptor_check_stream_dependency (desc)) {
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prop_copy_uint16 (desc->depends_on_es_id, buffer, size, offset);
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}
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if (desc_es_descriptor_check_url_flag (desc)) {
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prop_copy_size_string (desc->url_string, desc->url_length, buffer, size,
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offset);
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}
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if (desc_es_descriptor_check_ocr (desc)) {
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prop_copy_uint16 (desc->ocr_es_id, buffer, size, offset);
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}
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if (!desc_dec_config_descriptor_copy_data (&desc->dec_conf_desc, buffer, size,
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offset)) {
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return 0;
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}
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if (!desc_sl_config_descriptor_copy_data (&desc->sl_conf_desc, buffer, size,
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offset)) {
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return 0;
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}
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return *offset - original_offset;
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}
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