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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 <parser.h>
#include <audioparser_priv.h>
#include <aac_frame.h>
typedef struct
{
int samples_per_frame;
int scan_pos;
bgav_aac_frame_t * frame;
} aac_priv_t;
static int parse_aac(bgav_audio_parser_t * parser)
{
int bytes, samples = 0, result;
aac_priv_t * priv = parser->priv;
if(!priv->frame)
priv->frame = bgav_aac_frame_create(parser->s->opt,
parser->s->ext_data,
parser->s->ext_size);
if(!priv->samples_per_frame) // No non-silent frame yet
{
while(1)
{
if(priv->scan_pos >= parser->buf.size)
return PARSER_NEED_DATA;
// fprintf(stderr, "Scan %d\n", priv->scan_pos);
result = bgav_aac_frame_parse(priv->frame,
parser->buf.buffer + priv->scan_pos,
parser->buf.size - priv->scan_pos,
&bytes, &samples);
if(!result)
return PARSER_NEED_DATA;
else if(result > 0)
{
if(samples)
{
if(samples == 2048)
parser->s->ci.flags |= GAVL_COMPRESSION_SBR;
priv->samples_per_frame = samples;
priv->scan_pos = 0;
break;
}
else
{
priv->scan_pos += bytes;
}
}
else // result < 0
{
return PARSER_ERROR;
}
}
}
if(parser->buf.size - priv->scan_pos <= 0)
return PARSER_NEED_DATA;
result = bgav_aac_frame_parse(priv->frame,
parser->buf.buffer,
parser->buf.size,
&bytes, &samples);
if(!result)
return PARSER_NEED_DATA;
else if(result < 0)
return PARSER_ERROR;
if(!parser->have_format)
{
parser->have_format = 1;
bgav_aac_frame_get_audio_format(priv->frame, parser->s->data.audio.format);
return PARSER_HAVE_FORMAT;
}
if(result > 0)
{
// fprintf(stderr, "Got frame %d %d\n", bytes, priv->samples_per_frame);
bgav_audio_parser_set_frame(parser,
0, bytes, priv->samples_per_frame);
return PARSER_HAVE_FRAME;
}
return PARSER_ERROR;
}
static void cleanup_aac(bgav_audio_parser_t * parser)
{
aac_priv_t * priv = parser->priv;
if(priv->frame)
bgav_aac_frame_destroy(priv->frame);
free(priv);
}
static void reset_aac(bgav_audio_parser_t * parser)
{
aac_priv_t * priv = parser->priv;
priv->scan_pos = 0;
}
void bgav_audio_parser_init_aac(bgav_audio_parser_t * parser)
{
aac_priv_t * priv = calloc(1, sizeof(*priv));
parser->priv = priv;
priv->frame = bgav_aac_frame_create(parser->s->opt,
parser->s->ext_data, parser->s->ext_size);
parser->parse = parse_aac;
parser->cleanup = cleanup_aac;
parser->reset = reset_aac;
}
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