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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>
#include <adts_header.h>
#include <libavcodec/avcodec.h>
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(58, 91, 100)
# include <libavcodec/bsf.h>
#endif
#define LOG_DOMAIN "bsf_adts"
static void
filter_adts(bgav_bsf_t* bsf, bgav_packet_t * in, bgav_packet_t * out)
{
bgav_adts_header_t h;
int header_len = 7;
if((in->data_size < 7) || !bgav_adts_header_read(in->data, &h))
{
out->data_size = 0;
return;
}
if(!h.protection_absent)
header_len += 2;
bgav_packet_alloc(out, in->data_size - header_len);
memcpy(out->data, in->data + header_len, in->data_size - header_len);
out->data_size = in->data_size - header_len;
}
static void
cleanup_adts(bgav_bsf_t * bsf)
{
}
int
bgav_bsf_init_adts(bgav_bsf_t * bsf)
{
int ret = 0;
bgav_packet_t * p = NULL;
AVBSFContext * ctx;
const uint8_t * extradata;
int extradata_size = 0;
AVPacket pkt;
const AVBitStreamFilter *filter;
if(!(filter = av_bsf_get_by_name("aac_adtstoasc")))
{
gavl_log(GAVL_LOG_ERROR, LOG_DOMAIN,
"Bitstream filter aac_adtstoasc not found");
goto fail;
}
av_bsf_alloc(filter, &ctx);
/* Set codec parameters */
// ctx.
/* Fire up a bitstream filter for getting the extradata.
We'll do the rest by ourselfes */
ctx->par_in->codec_id = AV_CODEC_ID_AAC;
// ctx->par_in->
if(av_bsf_init(ctx))
{
gavl_log(GAVL_LOG_ERROR, LOG_DOMAIN,
"av_bsf_init failed");
goto fail;
}
/* Get a first packet to obtain the extradata */
if(bsf->src.peek_func(bsf->src.data, &p, 1) != GAVL_SOURCE_OK)
goto fail;
/* Send packet to the filter. Afterward we should have the
extradata set */
av_init_packet(&pkt);
av_new_packet(&pkt, p->data_size);
memcpy(pkt.data, p->data, p->data_size);
av_bsf_send_packet(ctx, &pkt);
/* Receive packets */
while(1)
{
if(av_bsf_receive_packet(ctx, &pkt))
break;
if((extradata = av_packet_get_side_data(&pkt, AV_PKT_DATA_NEW_EXTRADATA,
&extradata_size)))
{
// fprintf(stderr, "Got extradata %d bytes\n", extradata_size);
// gavl_hexdump(extradata, extradata_size, 16);
break;
}
}
bsf->ext_size = extradata_size;
bsf->ext_data = calloc(extradata_size, 1);
memcpy(bsf->ext_data, extradata, extradata_size);
// fprintf(stderr, "
// bgav_packet_dump(p);
bsf->filter = filter_adts;
bsf->cleanup = cleanup_adts;
ret = 1;
fail:
if(ctx)
av_bsf_free(&ctx);
return ret;
}
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