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/*****************************************************************
* gmerlin-avdecoder - a general purpose multimedia decoding library
*
* Copyright (c) 2001 - 2012 Members of the Gmerlin project
* gmerlin-general@lists.sourceforge.net
* http://gmerlin.sourceforge.net
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
#include <stdlib.h>
#include <string.h>
#include <config.h>
#include <avdec_private.h>
#include <bsf.h>
#include <bsf_private.h>
static const uint8_t nal_header[4] = { 0x00, 0x00, 0x00, 0x01 };
typedef struct
{
int nal_size_length;
} avcc_t;
static void append_data(bgav_packet_t * p, uint8_t * data, int len,
int header_len)
{
switch(header_len)
{
case 3:
bgav_packet_alloc(p, p->data_size + 3 + len);
memcpy(p->data + p->data_size, &nal_header[1], 3);
p->data_size += 3;
break;
case 4:
bgav_packet_alloc(p, p->data_size + 4 + len);
memcpy(p->data + p->data_size, nal_header, 4);
p->data_size += 4;
break;
}
memcpy(p->data + p->data_size, data, len);
p->data_size += len;
}
static void
filter_avcc(bgav_bsf_t* bsf, bgav_packet_t * in, bgav_packet_t * out)
{
uint8_t * ptr, *end;
int len = 0;
int nals_sent = 0;
avcc_t * priv = bsf->priv;
ptr = in->data;
end = in->data + in->data_size;
out->data_size = 0;
while(ptr < end - priv->nal_size_length)
{
switch(priv->nal_size_length)
{
case 1:
len = *ptr;
ptr++;
break;
case 2:
len = GAVL_PTR_2_16BE(ptr);
ptr += 2;
break;
case 4:
len = GAVL_PTR_2_32BE(ptr);
ptr += 4;
break;
default:
break;
}
append_data(out, ptr, len, nals_sent ? 3 : 4);
nals_sent++;
ptr += len;
}
}
static void
cleanup_avcc(bgav_bsf_t * bsf)
{
free(bsf->priv);
}
static void append_extradata(bgav_bsf_t * bsf, uint8_t * data,
int len)
{
bsf->ext_data = realloc(bsf->ext_data, bsf->ext_size + len + 4 +
GAVL_PACKET_PADDING );
memcpy(bsf->ext_data + bsf->ext_size, nal_header, 4);
bsf->ext_size += 4;
memcpy(bsf->ext_data + bsf->ext_size, data, len);
bsf->ext_size += len;
memset(bsf->ext_data + bsf->ext_size, 0, GAVL_PACKET_PADDING);
}
int
bgav_bsf_init_avcC(bgav_bsf_t * bsf)
{
uint8_t * ptr;
avcc_t * priv;
int num_units;
int i;
int len;
bsf->filter = filter_avcc;
bsf->cleanup = cleanup_avcc;
priv = calloc(1, sizeof(*priv));
bsf->priv = priv;
/* Parse extradata */
ptr = bsf->s->ci.global_header;
ptr += 4; // Version, profile, profile compat, level
priv->nal_size_length = (*ptr & 0x3) + 1;
ptr++;
/* SPS */
num_units = *ptr & 0x1f; ptr++;
for(i = 0; i < num_units; i++)
{
len = GAVL_PTR_2_16BE(ptr); ptr += 2;
append_extradata(bsf, ptr, len);
ptr += len;
}
/* PPS */
num_units = *ptr; ptr++;
for(i = 0; i < num_units; i++)
{
len = GAVL_PTR_2_16BE(ptr); ptr += 2;
append_extradata(bsf, ptr, len);
ptr += len;
}
return 1;
}
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