modules/codec/rawvideo.c

   1 /*****************************************************************************
   2  * rawvideo.c: Pseudo video decoder/packetizer for raw video data
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2002 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_plugin.h>
  33 #include <vlc_codec.h>
  34
  35 /*****************************************************************************
  36  * decoder_sys_t : raw video decoder descriptor
  37  *****************************************************************************/
  38 struct decoder_sys_t
  39 {
  40     /*
  41      * Input properties
  42      */
  43     size_t size;
  44     unsigned pitches[PICTURE_PLANE_MAX];
  45     unsigned lines[PICTURE_PLANE_MAX];
  46
  47     /*
  48      * Common properties
  49      */
  50     date_t pts;
  51 };
  52
  53 /****************************************************************************
  54  * Local prototypes
  55  ****************************************************************************/
  56 static int  OpenDecoder   ( vlc_object_t * );
  57 static int  OpenPacketizer( vlc_object_t * );
  58 static void CloseCommon   ( vlc_object_t * );
  59
  60 /*****************************************************************************
  61  * Module descriptor
  62  *****************************************************************************/
  63 vlc_module_begin ()
  64     set_description( N_("Pseudo raw video decoder") )
  65     set_capability( "decoder", 50 )
  66     set_category( CAT_INPUT )
  67     set_subcategory( SUBCAT_INPUT_VCODEC )
  68     set_callbacks( OpenDecoder, CloseCommon )
  69
  70     add_submodule ()
  71     set_description( N_("Pseudo raw video packetizer") )
  72     set_capability( "packetizer", 100 )
  73     set_callbacks( OpenPacketizer, CloseCommon )
  74 vlc_module_end ()
  75
  76 /**
  77  * Common initialization for decoder and packetizer
  78  */
  79 static int OpenCommon( decoder_t *p_dec )
  80 {
  81     const vlc_chroma_description_t *dsc =
  82         vlc_fourcc_GetChromaDescription( p_dec->fmt_in.i_codec );
  83     if( dsc == NULL || dsc->plane_count == 0 )
  84         return VLC_EGENERIC;
  85
  86     if( p_dec->fmt_in.video.i_width <= 0 || p_dec->fmt_in.video.i_height == 0 )
  87     {
  88         msg_Err( p_dec, "invalid display size %dx%d",
  89                  p_dec->fmt_in.video.i_width, p_dec->fmt_in.video.i_height );
  90         return VLC_EGENERIC;
  91     }
  92
  93     /* Allocate the memory needed to store the decoder's structure */
  94     decoder_sys_t *p_sys = calloc(1, sizeof(*p_sys));
  95     if( unlikely(p_sys == NULL) )
  96         return VLC_ENOMEM;
  97
  98     if( !p_dec->fmt_in.video.i_visible_width )
  99         p_dec->fmt_in.video.i_visible_width = p_dec->fmt_in.video.i_width;
 100     if( !p_dec->fmt_in.video.i_visible_height )
 101         p_dec->fmt_in.video.i_visible_height = p_dec->fmt_in.video.i_height;
 102
 103     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
 104
 105     date_Init( &p_sys->pts, p_dec->fmt_out.video.i_frame_rate,
 106                p_dec->fmt_out.video.i_frame_rate_base );
 107     if( p_dec->fmt_out.video.i_frame_rate == 0 ||
 108         p_dec->fmt_out.video.i_frame_rate_base == 0)
 109     {
 110         msg_Warn( p_dec, "invalid frame rate %d/%d, using 25 fps instead",
 111                   p_dec->fmt_out.video.i_frame_rate,
 112                   p_dec->fmt_out.video.i_frame_rate_base);
 113         date_Init( &p_sys->pts, 25, 1 );
 114     }
 115
 116     for( unsigned i = 0; i < dsc->plane_count; i++ )
 117     {
 118         unsigned pitch = p_dec->fmt_in.video.i_width * dsc->pixel_size
 119                          * dsc->p[i].w.num / dsc->p[i].w.den;
 120         unsigned lines = p_dec->fmt_in.video.i_height
 121                          * dsc->p[i].h.num / dsc->p[i].h.den;
 122
 123         p_sys->pitches[i] = pitch;
 124         p_sys->lines[i] = lines;
 125         p_sys->size += pitch * lines;
 126     }
 127
 128     p_dec->p_sys           = p_sys;
 129     return VLC_SUCCESS;
 130 }
 131
 132 /*****************************************************************************
 133  * Flush:
 134  *****************************************************************************/
 135 static void Flush( decoder_t *p_dec )
 136 {
 137     decoder_sys_t *p_sys = p_dec->p_sys;
 138
 139     date_Set( &p_sys->pts, VLC_TS_INVALID );
 140 }
 141
 142 /****************************************************************************
 143  * DecodeBlock: the whole thing
 144  ****************************************************************************
 145  * This function must be fed with complete frames.
 146  ****************************************************************************/
 147 static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 148 {
 149     decoder_sys_t *p_sys = p_dec->p_sys;
 150
 151     if( pp_block == NULL || *pp_block == NULL )
 152         return NULL;
 153
 154     block_t *p_block = *pp_block;
 155
 156     if( p_block->i_flags & BLOCK_FLAG_DISCONTINUITY )
 157         date_Set( &p_sys->pts, p_block->i_dts );
 158
 159     if( p_block->i_pts <= VLC_TS_INVALID && p_block->i_dts <= VLC_TS_INVALID &&
 160         !date_Get( &p_sys->pts ) )
 161     {
 162         /* We've just started the stream, wait for the first PTS. */
 163         block_Release( p_block );
 164         return NULL;
 165     }
 166
 167     /* Date management: If there is a pts avaliable, use that. */
 168     if( p_block->i_pts > VLC_TS_INVALID )
 169     {
 170         date_Set( &p_sys->pts, p_block->i_pts );
 171     }
 172     else if( p_block->i_dts > VLC_TS_INVALID )
 173     {
 174         /* NB, davidf doesn't quite agree with this in general, it is ok
 175          * for rawvideo since it is in order (ie pts=dts), however, it
 176          * may not be ok for an out-of-order codec, so don't copy this
 177          * without thinking */
 178         date_Set( &p_sys->pts, p_block->i_dts );
 179     }
 180
 181     if( p_block->i_buffer < p_sys->size )
 182     {
 183         msg_Warn( p_dec, "invalid frame size (%zu < %zu)",
 184                   p_block->i_buffer, p_sys->size );
 185
 186         block_Release( p_block );
 187         return NULL;
 188     }
 189
 190     *pp_block = NULL;
 191     return p_block;
 192 }
 193
 194 /*****************************************************************************
 195  * FillPicture:
 196  *****************************************************************************/
 197 static void FillPicture( decoder_t *p_dec, block_t *p_block, picture_t *p_pic )
 198 {
 199     decoder_sys_t *p_sys = p_dec->p_sys;
 200     const uint8_t *p_src = p_block->p_buffer;
 201
 202     for( int i = 0; i < p_pic->i_planes; i++ )
 203     {
 204         uint8_t *p_dst = p_pic->p[i].p_pixels;
 205
 206         for( int x = 0; x < p_pic->p[i].i_visible_lines; x++ )
 207         {
 208             memcpy( p_dst, p_src, p_pic->p[i].i_visible_pitch );
 209             p_src += p_sys->pitches[i];
 210             p_dst += p_pic->p[i].i_pitch;
 211         }
 212
 213         p_src += p_sys->pitches[i]
 214                * (p_sys->lines[i] - p_pic->p[i].i_visible_lines);
 215     }
 216 }
 217
 218 /*****************************************************************************
 219  * DecodeFrame: decodes a video frame.
 220  *****************************************************************************/
 221 static picture_t *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
 222 {
 223     block_t *p_block = DecodeBlock( p_dec, pp_block );
 224     if( p_block == NULL )
 225         return NULL;
 226
 227     decoder_sys_t *p_sys = p_dec->p_sys;
 228
 229     /* Get a new picture */
 230     picture_t *p_pic = NULL;
 231     if( !decoder_UpdateVideoFormat( p_dec ) )
 232         p_pic = decoder_NewPicture( p_dec );
 233     if( p_pic == NULL )
 234     {
 235         block_Release( p_block );
 236         return NULL;
 237     }
 238
 239     FillPicture( p_dec, p_block, p_pic );
 240
 241     /* Date management: 1 frame per packet */
 242     p_pic->date = date_Get( &p_dec->p_sys->pts );
 243     date_Increment( &p_sys->pts, 1 );
 244
 245     if( p_block->i_flags & BLOCK_FLAG_INTERLACED_MASK )
 246     {
 247         p_pic->b_progressive = false;
 248         p_pic->i_nb_fields = 2;
 249         if( p_block->i_flags & BLOCK_FLAG_TOP_FIELD_FIRST )
 250             p_pic->b_top_field_first = true;
 251         else
 252             p_pic->b_top_field_first = false;
 253     }
 254     else
 255         p_pic->b_progressive = true;
 256
 257     block_Release( p_block );
 258     return p_pic;
 259 }
 260
 261 static int OpenDecoder( vlc_object_t *p_this )
 262 {
 263     decoder_t *p_dec = (decoder_t *)p_this;
 264
 265     int ret = OpenCommon( p_dec );
 266     if( ret == VLC_SUCCESS )
 267     {
 268         p_dec->pf_decode_video = DecodeFrame;
 269         p_dec->pf_flush        = Flush;
 270     }
 271     return ret;
 272 }
 273
 274 /*****************************************************************************
 275  * SendFrame: send a video frame to the stream output.
 276  *****************************************************************************/
 277 static block_t *SendFrame( decoder_t *p_dec, block_t **pp_block )
 278 {
 279     block_t *p_block = DecodeBlock( p_dec, pp_block );
 280     if( p_block == NULL )
 281         return NULL;
 282
 283     decoder_sys_t *p_sys = p_dec->p_sys;
 284
 285     /* Date management: 1 frame per packet */
 286     p_block->i_dts = p_block->i_pts = date_Get( &p_sys->pts );
 287     date_Increment( &p_sys->pts, 1 );
 288     return p_block;
 289 }
 290
 291 static int OpenPacketizer( vlc_object_t *p_this )
 292 {
 293     decoder_t *p_dec = (decoder_t *)p_this;
 294
 295     int ret = OpenCommon( p_dec );
 296     if( ret == VLC_SUCCESS )
 297         p_dec->pf_packetize = SendFrame;
 298     return ret;
 299 }
 300
 301 /**
 302  * Common deinitialization
 303  */
 304 static void CloseCommon( vlc_object_t *p_this )
 305 {
 306     decoder_t *p_dec = (decoder_t*)p_this;
 307     free( p_dec->p_sys );
 308 }