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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 <avdec_private.h>
#include <opus_header.h>
#include <vorbis_comment.h>
/*
typedef struct
{
uint8_t version;
uint8_t channel_count;
uint16_t pre_skip;
uint32_t samplerate; // Bogus number!
int16_t output_gain;
uint8_t channel_mapping;
struct
{
uint8_t stream_count;
uint8_t coupled_count;
uint8_t map[256]; // 255 actually
} chtab; // Channel mapping table
} bgav_opus_header_t;
*/
int bgav_opus_header_read(bgav_input_context_t * input,
bgav_opus_header_t * ret)
{
bgav_input_skip(input, 8); /* Signature */
if(!bgav_input_read_data(input, &ret->version, 1) ||
!bgav_input_read_data(input, &ret->channel_count, 1) ||
!bgav_input_read_16_le(input, &ret->pre_skip) ||
!bgav_input_read_32_le(input, &ret->samplerate) ||
!bgav_input_read_16_le(input, (uint16_t*)&ret->output_gain) ||
!bgav_input_read_data(input, &ret->channel_mapping, 1))
return 0;
if(ret->channel_mapping != 0)
{
if(!bgav_input_read_data(input, &ret->chtab.stream_count, 1) ||
!bgav_input_read_data(input, &ret->chtab.coupled_count, 1))
return 0;
if(bgav_input_read_data(input, ret->chtab.map, ret->channel_count) <
ret->channel_count)
return 0;
}
else
{
/* Set defaults if they are not coded */
ret->chtab.stream_count = 1;
ret->chtab.coupled_count = ret->channel_count-1;
ret->chtab.map[0] = 0;
if(ret->channel_count == 2)
ret->chtab.map[1] = 1;
}
return 1;
}
void bgav_opus_header_dump(const bgav_opus_header_t * h)
{
gavl_dprintf("Opus header\n");
gavl_dprintf(" Version: %d\n", h->version);
gavl_dprintf(" Channel count: %d\n", h->channel_count);
gavl_dprintf(" Pre Skip: %d\n", h->pre_skip);
gavl_dprintf(" Samplerate: %d\n", h->samplerate);
gavl_dprintf(" Output Gain: %d\n", h->output_gain);
gavl_dprintf(" Channel Mapping: %d\n", h->channel_mapping);
if(h->channel_mapping != 0)
{
int i;
gavl_dprintf(" Channel Mapping Table\n");
gavl_dprintf(" Stream Count: %d\n", h->chtab.stream_count);
gavl_dprintf(" Coupled Count: %d\n", h->chtab.coupled_count);
gavl_dprintf(" Map\n");
for(i = 0; i < h->channel_count; i++)
{
gavl_dprintf(" Index %d: %d\n", i+1, h->chtab.map[i]);
}
}
}
void bgav_opus_set_channel_setup(const bgav_opus_header_t * h,
gavl_audio_format_t * fmt)
{
switch(h->channel_mapping)
{
case 0: // Simple
gavl_set_channel_setup(fmt);
break;
case 1: // Vorbis
bgav_vorbis_set_channel_setup(fmt);
break;
default: // treat as 255
{
int i;
for(i = 0; i < fmt->num_channels; i++)
fmt->channel_locations[i] = GAVL_CHID_AUX;
}
}
}
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