modules/codec/bpg.c

   1 /*****************************************************************************
   2  * bpg.c: bpg decoder module using libbpg.
   3  *****************************************************************************
   4  * Copyright (C) 2015 VLC authors and VideoLAN
   5  *
   6  * Author: Tristan Matthews <tmatth@videolan.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 #ifdef HAVE_CONFIG_H
  24 # include "config.h"
  25 #endif
  26
  27 #include <vlc_common.h>
  28 #include <vlc_plugin.h>
  29 #include <vlc_codec.h>
  30 #include <libbpg.h>
  31
  32 typedef struct
  33 {
  34     struct BPGDecoderContext *p_bpg;
  35 } decoder_sys_t;
  36
  37 static int  OpenDecoder(vlc_object_t *);
  38 static void CloseDecoder(vlc_object_t *);
  39
  40 static int DecodeBlock(decoder_t *, block_t *);
  41
  42 /*
  43  * Module descriptor
  44  */
  45 vlc_module_begin()
  46     set_category( CAT_INPUT )
  47     set_subcategory( SUBCAT_INPUT_VCODEC )
  48     /* decoder main module */
  49     set_description( N_("BPG image decoder") )
  50     set_capability( "video decoder", 60 )
  51     set_callbacks( OpenDecoder, CloseDecoder )
  52     add_shortcut( "bpg" )
  53 vlc_module_end()
  54
  55
  56 static int OpenDecoder(vlc_object_t *p_this)
  57 {
  58     decoder_t *p_dec = (decoder_t *)p_this;
  59
  60     if( p_dec->fmt_in.i_codec != VLC_CODEC_BPG )
  61     {
  62         return VLC_EGENERIC;
  63     }
  64
  65     decoder_sys_t *p_sys = malloc( sizeof( decoder_sys_t ) );
  66     if( p_sys == NULL )
  67     {
  68         return VLC_ENOMEM;
  69     }
  70
  71     p_dec->p_sys = p_sys;
  72
  73     p_sys->p_bpg = bpg_decoder_open();
  74     if( !p_sys->p_bpg )
  75     {
  76         return VLC_EGENERIC;
  77     }
  78
  79     /* Set callbacks */
  80     p_dec->pf_decode = DecodeBlock;
  81
  82     return VLC_SUCCESS;
  83 }
  84
  85 /*
  86  * This function must be fed with a complete compressed frame.
  87  */
  88 static int DecodeBlock( decoder_t *p_dec, block_t *p_block )
  89 {
  90     decoder_sys_t *p_sys = p_dec->p_sys;
  91     picture_t *p_pic = 0;
  92     BPGImageInfo img_info;
  93
  94     if( p_block == NULL ) /* No Drain */
  95         return VLCDEC_SUCCESS;
  96
  97     if( p_block->i_flags & BLOCK_FLAG_CORRUPTED )
  98         goto error;
  99
 100     /* Decode picture */
 101
 102     if( bpg_decoder_decode( p_sys->p_bpg,
 103                             p_block->p_buffer,
 104                             p_block->i_buffer ) < 0 )
 105     {
 106         msg_Err( p_dec, "Could not decode block" );
 107         goto error;
 108     }
 109
 110     if( bpg_decoder_get_info( p_sys->p_bpg, &img_info ) )
 111     {
 112         msg_Err( p_dec, "Could not get info for decoder" );
 113         goto error;
 114     }
 115
 116     if( bpg_decoder_start( p_sys->p_bpg, BPG_OUTPUT_FORMAT_RGB24 ) )
 117     {
 118         msg_Err( p_dec, "Could not start decoder" );
 119         goto error;
 120     }
 121
 122     /* Set output properties */
 123     p_dec->fmt_out.i_codec = VLC_CODEC_RGB24;
 124     p_dec->fmt_out.video.i_visible_width  = p_dec->fmt_out.video.i_width  = img_info.width;
 125     p_dec->fmt_out.video.i_visible_height = p_dec->fmt_out.video.i_height = img_info.height;
 126     p_dec->fmt_out.video.i_sar_num = 1;
 127     p_dec->fmt_out.video.i_sar_den = 1;
 128
 129     /* Get a new picture */
 130     if( decoder_UpdateVideoFormat( p_dec ) )
 131     {
 132         goto error;
 133     }
 134     p_pic = decoder_NewPicture( p_dec );
 135     if( !p_pic )
 136     {
 137         goto error;
 138     }
 139
 140     const int img_height = img_info.height;
 141     for (int i = 0; i < img_height; i++)
 142     {
 143         if( bpg_decoder_get_line( p_sys->p_bpg,
 144                                   p_pic->p->p_pixels + p_pic->p->i_pitch * i )
 145                                   < 0 )
 146         {
 147             msg_Err( p_dec, "Could not decode line" );
 148             goto error;
 149         }
 150     }
 151
 152     p_pic->date = p_block->i_pts != VLC_TICK_INVALID ? p_block->i_pts : p_block->i_dts;
 153
 154     decoder_QueueVideo( p_dec, p_pic );
 155 error:
 156     block_Release( p_block );
 157     return VLCDEC_SUCCESS;
 158 }
 159
 160 static void CloseDecoder( vlc_object_t *p_this )
 161 {
 162     decoder_t *p_dec = (decoder_t *)p_this;
 163     decoder_sys_t *p_sys = p_dec->p_sys;
 164
 165     if( p_sys->p_bpg )
 166         bpg_decoder_close( p_sys->p_bpg );
 167
 168     free( p_sys );
 169 }