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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 <string.h>
#include <config.h>
#include <avdec_private.h>
#include <ogg_header.h>
#include <gavl/log.h>
#define LOG_DOMAIN "ogg"
int bgav_ogg_page_read_header(bgav_input_context_t * ctx,
bgav_ogg_page_t * ret)
{
ret->position = ctx->position;
bgav_input_skip(ctx, 4); // OggS
if((bgav_input_read_data(ctx, &ret->stream_structure_version, 1) < 1) ||
(bgav_input_read_data(ctx, &ret->header_type_flags, 1) < 1) ||
(!bgav_input_read_64_le(ctx, (uint64_t*)&ret->granulepos)) ||
(!bgav_input_read_32_le(ctx, &ret->serialno)) ||
(!bgav_input_read_32_le(ctx, &ret->sequenceno)) ||
(!bgav_input_read_32_le(ctx, &ret->crc)) ||
(bgav_input_read_data(ctx, &ret->num_page_segments, 1) < 1) ||
(bgav_input_read_data(ctx, ret->page_segments, ret->num_page_segments) < ret->num_page_segments))
return 0;
else
{
// bgav_ogg_page_dump_header(ret);
ret->valid = 1;
return 1;
}
}
void bgav_ogg_page_dump_header(const bgav_ogg_page_t * p)
{
int i, num;
gavl_dprintf("Ogg Page:\n");
gavl_dprintf(" file position: %"PRId64":\n", p->position);
gavl_dprintf(" stream_structure_version: %d:\n", p->stream_structure_version);
gavl_dprintf(" header_type_flags: %d: (Continued: %d, BOS: %d EOS: %d)\n",
p->header_type_flags,
p->header_type_flags & BGAV_OGG_HEADER_TYPE_CONTINUED,
p->header_type_flags & BGAV_OGG_HEADER_TYPE_BOS,
p->header_type_flags & BGAV_OGG_HEADER_TYPE_EOS);
gavl_dprintf(" granulepos: %"PRId64"\n", p->granulepos);
gavl_dprintf(" serialno: %d\n", p->serialno);
gavl_dprintf(" sequenceno: %d\n", p->sequenceno);
gavl_dprintf(" crc: %08x\n", p->crc);
gavl_dprintf(" num_page_segments: %d\n", p->num_page_segments);
num = bgav_ogg_page_num_packets(p);
gavl_dprintf(" (partial) packets: %d\n", num);
gavl_dprintf(" Page segments:\n");
// for(i = 0; i < p->num_page_segments; i++)
// gavl_dprintf(" %d\n", p->page_segments[i]);
for(i = 0; i < num; i++)
gavl_dprintf(" %d\n", bgav_ogg_page_get_packet_size(p, i));
}
int bgav_ogg_page_num_packets(const bgav_ogg_page_t * h)
{
int i;
int ret = 0;
if(!h->num_page_segments)
return 0;
for(i = 0; i < h->num_page_segments; i++)
{
if(h->page_segments[i] < 255)
ret++;
}
if(h->page_segments[h->num_page_segments-1] == 255)
ret++;
return ret;
}
int bgav_ogg_page_get_packet_size(const bgav_ogg_page_t * h, int idx)
{
int i;
int ret = 0;
int count = 0;
for(i = 0; i < h->num_page_segments; i++)
{
if(count < idx)
{
if(h->page_segments[i] < 255)
count++;
continue;
}
ret += h->page_segments[i];
if(h->page_segments[i] < 255)
break;
}
return ret;
}
int bgav_ogg_probe(bgav_input_context_t * input)
{
uint8_t probe_data[4];
if(bgav_input_get_data(input, probe_data, 4) < 4)
return 0;
if((probe_data[0] == 'O') &&
(probe_data[1] == 'g') &&
(probe_data[2] == 'g') &&
(probe_data[3] == 'S'))
return 1;
return 0;
}
void bgav_ogg_page_skip(bgav_input_context_t * ctx,
const bgav_ogg_page_t * h)
{
int i, len = 0;
for(i = 0; i < h->num_page_segments; i++)
len += h->page_segments[i];
bgav_input_skip(ctx, len);
}
/* OGM header */
int bgav_ogm_header_read(bgav_input_context_t * input, bgav_ogm_header_t * ret)
{
if((bgav_input_read_data(input, (uint8_t*)ret->type, 8) < 8) ||
!bgav_input_read_fourcc(input, &ret->subtype) ||
!bgav_input_read_32_le(input, &ret->size) ||
!bgav_input_read_64_le(input, &ret->time_unit) ||
!bgav_input_read_64_le(input, &ret->samples_per_unit) ||
!bgav_input_read_32_le(input, &ret->default_len) ||
!bgav_input_read_32_le(input, &ret->buffersize) ||
!bgav_input_read_16_le(input, &ret->bits_per_sample) ||
!bgav_input_read_16_le(input, &ret->padding))
return 0;
if(gavl_string_starts_with(ret->type, "video"))
{
if(!bgav_input_read_32_le(input, &ret->data.video.width) ||
!bgav_input_read_32_le(input, &ret->data.video.height))
return 0;
return 1;
}
else if(gavl_string_starts_with(ret->type, "audio"))
{
if(!bgav_input_read_16_le(input, &ret->data.audio.channels) ||
!bgav_input_read_16_le(input, &ret->data.audio.blockalign) ||
!bgav_input_read_32_le(input, &ret->data.audio.avgbytespersec))
return 0;
return 1;
}
else if(gavl_string_starts_with(ret->type, "text"))
{
return 1;
}
else
{
gavl_log(GAVL_LOG_WARNING, LOG_DOMAIN,
"Unknown stream type \"%.8s\" in OGM header", ret->type);
return 0;
}
}
void bgav_ogm_header_dump(bgav_ogm_header_t * h)
{
gavl_dprintf( "OGM Header\n");
gavl_dprintf( " Type %.8s\n", h->type);
gavl_dprintf( " Subtype: ");
bgav_dump_fourcc(h->subtype);
gavl_dprintf( "\n");
gavl_dprintf( " Size: %d\n", h->size);
gavl_dprintf( " Time unit: %" PRId64 "\n", h->time_unit);
gavl_dprintf( " Samples per unit: %" PRId64 "\n", h->samples_per_unit);
gavl_dprintf( " Default len: %d\n", h->default_len);
gavl_dprintf( " Buffer size: %d\n", h->buffersize);
gavl_dprintf( " Bits per sample: %d\n", h->bits_per_sample);
if(gavl_string_starts_with(h->type, "video"))
{
gavl_dprintf( " Width: %d\n", h->data.video.width);
gavl_dprintf( " Height: %d\n", h->data.video.height);
}
if(gavl_string_starts_with(h->type, "audio"))
{
gavl_dprintf( " Channels: %d\n", h->data.audio.channels);
gavl_dprintf( " Block align: %d\n", h->data.audio.blockalign);
gavl_dprintf( " Avg bytes per sec: %d\n", h->data.audio.avgbytespersec);
}
}
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