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/*****************************************************************
* gmerlin-avdecoder - a general purpose multimedia decoding library
*
* Copyright (c) 2001 - 2024 Members of the Gmerlin project
* http://github.com/bplaum
*
* 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 <avdec_private.h>
#include <parser.h>
#include <flac_header.h>
#define LOG_DOMAIN "parse_flac"
typedef struct
{
bgav_flac_streaminfo_t si;
} flac_priv_t;
/* Find the boundary of a frame.
if found: set buf.pos to the frame start, set *skip to the bytes after pos, where
we scan for the next frame boundary
if not found: set buf.pos to the position, where we can re-start the scan
*/
static int find_frame_boundary_flac(struct bgav_packet_parser_s * parser, int * skip)
{
bgav_flac_frame_header_t h;
int i;
flac_priv_t * priv = parser->priv;
for(i = parser->buf.pos; i < parser->buf.len - BGAV_FLAC_FRAMEHEADER_MAX; i++)
{
if(bgav_flac_frame_header_read(parser->buf.buf + i, parser->buf.len - i,
&priv->si, &h))
{
parser->buf.pos = i;
*skip = BGAV_FLAC_FRAMEHEADER_MIN;
return 1;
}
// else if()
}
parser->buf.pos = parser->buf.len - BGAV_FLAC_FRAMEHEADER_MAX;
return 0;
}
static int parse_frame_flac(bgav_packet_parser_t * parser, bgav_packet_t * p)
{
bgav_flac_frame_header_t fh;
flac_priv_t * priv = parser->priv;
if(p->buf.len < BGAV_FLAC_FRAMEHEADER_MIN)
return 0;
bgav_flac_frame_header_read(p->buf.buf, p->buf.len, &priv->si, &fh);
p->duration = fh.blocksize;
#if 0
if((priv->si.total_samples > 0) &&
(p->pts < priv->si.total_samples) &&
(p->pts + p->duration > priv->si.total_samples))
p->duration = priv->si.total_samples - p->pts;
#endif
return 1;
}
static void cleanup_flac(bgav_packet_parser_t * parser)
{
flac_priv_t * priv = parser->priv;
free(priv);
}
void bgav_packet_parser_init_flac(bgav_packet_parser_t * parser)
{
flac_priv_t * priv;
/* Get stream info */
if(parser->ci->codec_header.len != 42)
{
gavl_log(GAVL_LOG_ERROR, LOG_DOMAIN,
"Corrupted flac header, expected 42 bytes, got %d", parser->ci->codec_header.len);
gavl_hexdump(parser->ci->codec_header.buf, parser->ci->codec_header.len, 16);
return;
}
priv = calloc(1, sizeof(*priv));
parser->priv = priv;
bgav_flac_streaminfo_read(parser->ci->codec_header.buf + 8, &priv->si);
bgav_flac_streaminfo_init_stream(&priv->si, parser->info);
parser->parse_frame = parse_frame_flac;
parser->find_frame_boundary = find_frame_boundary_flac;
parser->cleanup = cleanup_flac;
}
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