/*****************************************************************************
* decoder_helpers.c: Functions for the management of decoders
*****************************************************************************
* Copyright (C) 1999-2019 VLC authors and VideoLAN
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
* Gildas Bazin <gbazin@videolan.org>
* Laurent Aimar <fenrir@via.ecp.fr>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_codec.h>
#include <vlc_atomic.h>
#include <vlc_meta.h>
#include <vlc_modules.h>
#include <vlc_picture.h>
#include "../libvlc.h"
#include <stdckdint.h>
void decoder_Init( decoder_t *p_dec, es_format_t *restrict fmt_in, const es_format_t *restrict p_fmt )
{
p_dec->i_extra_picture_buffers = 0;
p_dec->b_frame_drop_allowed = false;
p_dec->pf_decode = NULL;
p_dec->pf_get_cc = NULL;
p_dec->pf_packetize = NULL;
p_dec->pf_flush = NULL;
p_dec->p_module = NULL;
assert(fmt_in != NULL);
es_format_Copy( fmt_in, p_fmt );
p_dec->fmt_in = fmt_in;
es_format_Init( &p_dec->fmt_out, p_fmt->i_cat, 0 );
}
int decoder_LoadModule(decoder_t *dec, bool packetizer,
bool use_varoption)
{
assert(dec->fmt_in->i_cat != UNKNOWN_ES);
assert(dec->p_module == NULL);
static const char dec_caps[ES_CATEGORY_COUNT][16] = {
[VIDEO_ES] = "video decoder",
[AUDIO_ES] = "audio decoder",
[SPU_ES] = "spu decoder",
};
static const char pkt_caps[ES_CATEGORY_COUNT][19] = {
[VIDEO_ES] = "video packetizer",
[AUDIO_ES] = "audio packetizer",
[SPU_ES] = "spu packetizer",
};
const char *type, *option;
if (packetizer)
{
type = pkt_caps[dec->fmt_in->i_cat];
option = use_varoption ? "packetizer" : NULL;
}
else
{
type = dec_caps[dec->fmt_in->i_cat];
option = use_varoption ? "codec" : NULL;
}
if (option != NULL)
dec->p_module = module_need_var(dec, type, option);
else
dec->p_module = module_need(dec, type, NULL, false);
return dec->p_module == NULL ? VLC_ENOENT : VLC_SUCCESS;
}
void decoder_Clean( decoder_t *p_dec )
{
if ( p_dec->p_module != NULL )
{
module_unneed(p_dec, p_dec->p_module);
p_dec->p_module = NULL;
}
es_format_Clean( &p_dec->fmt_out );
if ( p_dec->p_description )
{
vlc_meta_Delete(p_dec->p_description);
p_dec->p_description = NULL;
}
}
int decoder_UpdateVideoFormat( decoder_t *dec )
{
return decoder_UpdateVideoOutput( dec, NULL );
}
int decoder_UpdateVideoOutput( decoder_t *dec, vlc_video_context *vctx_out )
{
vlc_assert( dec->fmt_in->i_cat == VIDEO_ES && dec->cbs != NULL );
if ( unlikely(dec->fmt_in->i_cat != VIDEO_ES || dec->cbs == NULL) )
return -1;
/* */
const vlc_chroma_description_t *dsc =
vlc_fourcc_GetChromaDescription(dec->fmt_out.i_codec);
if (unlikely(dsc == NULL))
// the "codec" must be a valid picture chroma
return -1;
dec->fmt_out.video.i_chroma = dec->fmt_out.i_codec;
if( dec->fmt_out.video.i_visible_height == 1088 &&
var_CreateGetBool( dec, "hdtv-fix" ) )
{
dec->fmt_out.video.i_visible_height = 1080;
if( !(dec->fmt_out.video.i_sar_num % 136))
{
dec->fmt_out.video.i_sar_num *= 135;
dec->fmt_out.video.i_sar_den *= 136;
}
msg_Warn( dec, "Fixing broken HDTV stream (display_height=1088)");
}
if( !dec->fmt_out.video.i_sar_num || !dec->fmt_out.video.i_sar_den )
{
dec->fmt_out.video.i_sar_num = 1;
dec->fmt_out.video.i_sar_den = 1;
}
vlc_ureduce( &dec->fmt_out.video.i_sar_num, &dec->fmt_out.video.i_sar_den,
dec->fmt_out.video.i_sar_num, dec->fmt_out.video.i_sar_den, 50000 );
unsigned int v;
if( vlc_fourcc_IsYUV( dec->fmt_out.video.i_chroma ) )
{
for( unsigned int i = 0; dsc && i < dsc->plane_count; i++ )
{
unsigned int extra_padding;
extra_padding = dec->fmt_out.video.i_width % dsc->p[i].w.den;
if (extra_padding != 0)
{
if (unlikely(ckd_add(&v, dec->fmt_out.video.i_width, dsc->p[i].w.den - extra_padding)))
{
msg_Err( dec, "Cannot add %u to the decoder width %u",
dsc->p[i].w.den - extra_padding,
dec->fmt_out.video.i_width );
return -1;
}
dec->fmt_out.video.i_width = v;
}
extra_padding = dec->fmt_out.video.i_height % dsc->p[i].h.den;
if (extra_padding != 0)
{
if (unlikely(ckd_add(&v, dec->fmt_out.video.i_height, dsc->p[i].h.den - extra_padding)))
{
msg_Err( dec, "Cannot add %u to the decoder height %u",
dsc->p[i].h.den - extra_padding,
dec->fmt_out.video.i_height );
return -1;
}
dec->fmt_out.video.i_height = v;
}
}
}
if( !dec->fmt_out.video.i_visible_width ||
!dec->fmt_out.video.i_visible_height )
{
if( dec->fmt_in->video.i_visible_width &&
dec->fmt_in->video.i_visible_height )
{
dec->fmt_out.video.i_visible_width = dec->fmt_in->video.i_visible_width;
dec->fmt_out.video.i_visible_height = dec->fmt_in->video.i_visible_height;
dec->fmt_out.video.i_x_offset = dec->fmt_in->video.i_x_offset;
dec->fmt_out.video.i_y_offset = dec->fmt_in->video.i_y_offset;
}
else
{
dec->fmt_out.video.i_visible_width = dec->fmt_out.video.i_width;
dec->fmt_out.video.i_visible_height = dec->fmt_out.video.i_height;
dec->fmt_out.video.i_x_offset = 0;
dec->fmt_out.video.i_y_offset = 0;
}
}
assert(!ckd_add(&v, dec->fmt_out.video.i_visible_width, dec->fmt_out.video.i_x_offset) && v <= dec->fmt_out.video.i_width);
assert(!ckd_add(&v, dec->fmt_out.video.i_visible_height, dec->fmt_out.video.i_y_offset) && v <= dec->fmt_out.video.i_height);
video_format_AdjustColorSpace( &dec->fmt_out.video );
if (dec->cbs->video.format_update == NULL)
return 0;
return dec->cbs->video.format_update( dec, vctx_out );
}
picture_t *decoder_NewPicture( decoder_t *dec )
{
vlc_assert( dec->fmt_in->i_cat == VIDEO_ES && dec->cbs != NULL );
if (dec->cbs->video.buffer_new == NULL)
return picture_NewFromFormat( &dec->fmt_out.video );
return dec->cbs->video.buffer_new( dec );
}
/** encoder **/
vlc_decoder_device *vlc_encoder_GetDecoderDevice( encoder_t *enc )
{
vlc_assert( enc->fmt_in.i_cat == VIDEO_ES && enc->cbs != NULL );
if ( unlikely(enc->fmt_in.i_cat != VIDEO_ES || enc->cbs == NULL ) )
return NULL;
return enc->cbs->video.get_device( enc );
}
void vlc_encoder_Destroy(encoder_t *encoder)
{
if (encoder->ops != NULL && encoder->ops->close != NULL)
encoder->ops->close(encoder);
es_format_Clean(&encoder->fmt_in);
es_format_Clean(&encoder->fmt_out);
vlc_objres_clear(VLC_OBJECT(encoder));
vlc_object_delete(encoder);
}
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(vorverarbeitet am 2026-11-04)
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