git.sesse.net Git - vlc/blob - modules/stream_out/transrate/transrate.c

   1 /*****************************************************************************
   2  * transrate.c: MPEG2 video transrating module
   3  *****************************************************************************
   4  * Copyright (C) 2003 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *          Laurent Aimar <fenrir@via.ecp.fr>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #define NDEBUG 1
  29 #include <assert.h>
  30 #include <math.h>
  31
  32 #ifdef HAVE_CONFIG_H
  33 # include "config.h"
  34 #endif
  35
  36 #include <vlc/vlc.h>
  37 #include <vlc_sout.h>
  38 #include <vlc_input.h>
  39
  40 #include "transrate.h"
  41
  42 /*****************************************************************************
  43  * Exported prototypes
  44  *****************************************************************************/
  45 static int      Open    ( vlc_object_t * );
  46 static void     Close   ( vlc_object_t * );
  47
  48 static sout_stream_id_t *Add ( sout_stream_t *, es_format_t * );
  49 static int               Del ( sout_stream_t *, sout_stream_id_t * );
  50 static int               Send( sout_stream_t *, sout_stream_id_t *, block_t * );
  51
  52 static int  transrate_video_process( sout_stream_t *, sout_stream_id_t *, block_t *, block_t ** );
  53
  54 /*****************************************************************************
  55  * Module descriptor
  56  *****************************************************************************/
  57 vlc_module_begin();
  58     set_category( CAT_SOUT );
  59     set_subcategory( SUBCAT_SOUT_STREAM );
  60     set_description( _("MPEG2 video transrating stream output") );
  61     set_capability( "sout stream", 50 );
  62     add_shortcut( "transrate" );
  63     set_callbacks( Open, Close );
  64 vlc_module_end();
  65
  66 struct sout_stream_sys_t
  67 {
  68     sout_stream_t   *p_out;
  69
  70     int             i_vbitrate;
  71     mtime_t         i_shaping_delay;
  72     int             b_mpeg4_matrix;
  73
  74     mtime_t         i_dts, i_pts;
  75 };
  76
  77 /*****************************************************************************
  78  * Open:
  79  *****************************************************************************/
  80 static int Open( vlc_object_t *p_this )
  81 {
  82     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
  83     sout_stream_sys_t *p_sys;
  84     char *val;
  85
  86     p_sys = malloc( sizeof( sout_stream_sys_t ) );
  87     p_sys->p_out = sout_StreamNew( p_stream->p_sout, p_stream->psz_next );
  88
  89     p_sys->i_vbitrate   = 0;
  90
  91     if( ( val = sout_cfg_find_value( p_stream->p_cfg, "vb" ) ) )
  92     {
  93         p_sys->i_vbitrate = atoi( val );
  94         if( p_sys->i_vbitrate < 16000 )
  95         {
  96             p_sys->i_vbitrate *= 1000;
  97         }
  98     }
  99     else
 100     {
 101         p_sys->i_vbitrate = 3000000;
 102     }
 103
 104     p_sys->i_shaping_delay = 500000;
 105     if( ( val = sout_cfg_find_value( p_stream->p_cfg, "shaping" ) ) )
 106     {
 107         p_sys->i_shaping_delay = (int64_t)atoi( val ) * 1000;
 108         if( p_sys->i_shaping_delay <= 0 )
 109         {
 110             msg_Err( p_stream,
 111                      "invalid shaping ("I64Fd"ms) reseting to 500ms",
 112                      p_sys->i_shaping_delay / 1000 );
 113             p_sys->i_shaping_delay = 500000;
 114         }
 115     }
 116
 117     p_sys->b_mpeg4_matrix = 0;
 118     if( sout_cfg_find( p_stream->p_cfg, "mpeg4-matrix" ) )
 119     {
 120         p_sys->b_mpeg4_matrix = 1;
 121     }
 122
 123     msg_Dbg( p_stream, "codec video %dkb/s max gop="I64Fd"us",
 124              p_sys->i_vbitrate / 1024, p_sys->i_shaping_delay );
 125
 126     if( !p_sys->p_out )
 127     {
 128         msg_Err( p_stream, "cannot create chain" );
 129         free( p_sys );
 130         return VLC_EGENERIC;
 131     }
 132     p_stream->pf_add    = Add;
 133     p_stream->pf_del    = Del;
 134     p_stream->pf_send   = Send;
 135
 136     p_stream->p_sys     = p_sys;
 137
 138     return VLC_SUCCESS;
 139 }
 140
 141 /*****************************************************************************
 142  * Close:
 143  *****************************************************************************/
 144 static void Close( vlc_object_t * p_this )
 145 {
 146     sout_stream_t       *p_stream = (sout_stream_t *)p_this;
 147     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 148
 149     sout_StreamDelete( p_sys->p_out );
 150     free( p_sys );
 151 }
 152
 153
 154 static sout_stream_id_t * Add( sout_stream_t *p_stream, es_format_t *p_fmt )
 155 {
 156     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 157     sout_stream_id_t    *id;
 158
 159     id = malloc( sizeof( sout_stream_id_t ) );
 160     id->id = NULL;
 161
 162     if( p_fmt->i_cat == VIDEO_ES
 163             && p_fmt->i_codec == VLC_FOURCC('m', 'p', 'g', 'v') )
 164     {
 165         msg_Dbg( p_stream,
 166                  "creating video transrating for fcc=`%4.4s'",
 167                  (char*)&p_fmt->i_codec );
 168
 169         id->p_current_buffer = NULL;
 170         id->p_next_gop = NULL;
 171         id->i_next_gop_duration = 0;
 172         id->i_next_gop_size = 0;
 173         memset( &id->tr, 0, sizeof( transrate_t ) );
 174         id->tr.bs.i_byte_in = id->tr.bs.i_byte_out = 0;
 175         id->tr.mpeg4_matrix = p_sys->b_mpeg4_matrix;
 176
 177         /* open output stream */
 178         id->id = p_sys->p_out->pf_add( p_sys->p_out, p_fmt );
 179         id->b_transrate = VLC_TRUE;
 180     }
 181     else
 182     {
 183         msg_Dbg( p_stream, "not transrating a stream (fcc=`%4.4s')", (char*)&p_fmt->i_codec );
 184         id->id = p_sys->p_out->pf_add( p_sys->p_out, p_fmt );
 185         id->b_transrate = VLC_FALSE;
 186
 187         if( id->id == NULL )
 188         {
 189             free( id );
 190             return NULL;
 191         }
 192     }
 193
 194     return id;
 195 }
 196
 197 static int     Del      ( sout_stream_t *p_stream, sout_stream_id_t *id )
 198 {
 199     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 200
 201     if( id->id )
 202     {
 203         p_sys->p_out->pf_del( p_sys->p_out, id->id );
 204     }
 205     free( id );
 206
 207     return VLC_SUCCESS;
 208 }
 209
 210 static int Send( sout_stream_t *p_stream, sout_stream_id_t *id,
 211                  block_t *p_buffer )
 212 {
 213     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 214
 215     if( id->b_transrate )
 216     {
 217         block_t *p_buffer_out;
 218         /* be sure to have at least 8 bytes of padding (maybe only 4) */
 219         p_buffer = block_Realloc( p_buffer, 0, p_buffer->i_buffer + 8 );
 220         p_buffer->i_buffer -= 8;
 221         memset( &p_buffer->p_buffer[p_buffer->i_buffer], 0, 8 );
 222
 223         transrate_video_process( p_stream, id, p_buffer, &p_buffer_out );
 224
 225         if( p_buffer_out )
 226         {
 227             return p_sys->p_out->pf_send( p_sys->p_out, id->id, p_buffer_out );
 228         }
 229         return VLC_SUCCESS;
 230     }
 231     else if( id->id != NULL )
 232     {
 233         return p_sys->p_out->pf_send( p_sys->p_out, id->id, p_buffer );
 234     }
 235     else
 236     {
 237         block_Release( p_buffer );
 238         return VLC_EGENERIC;
 239     }
 240 }
 241
 242 static int transrate_video_process( sout_stream_t *p_stream,
 243                sout_stream_id_t *id, block_t *in, block_t **out )
 244 {
 245     transrate_t    *tr = &id->tr;
 246     bs_transrate_t *bs = &tr->bs;
 247
 248     *out = NULL;
 249
 250     while ( in != NULL )
 251     {
 252         block_t * p_next = in->p_next;
 253         int i_flags = in->i_flags;
 254
 255         in->p_next = NULL;
 256         block_ChainAppend( &id->p_next_gop, in );
 257         id->i_next_gop_duration += in->i_length;
 258         id->i_next_gop_size += in->i_buffer;
 259         in = p_next;
 260
 261         if( ((i_flags & BLOCK_FLAG_TYPE_I )
 262                 && id->i_next_gop_duration >= 300000)
 263               || (id->i_next_gop_duration > p_stream->p_sys->i_shaping_delay) )
 264         {
 265             mtime_t i_bitrate = (mtime_t)id->i_next_gop_size * 8000
 266                                     / (id->i_next_gop_duration / 1000);
 267             mtime_t i_new_bitrate;
 268
 269             id->tr.i_total_input = id->i_next_gop_size;
 270             id->tr.i_remaining_input = id->i_next_gop_size;
 271             id->tr.i_wanted_output = (p_stream->p_sys->i_vbitrate)
 272                                     * (id->i_next_gop_duration / 1000) / 8000;
 273             id->tr.i_current_output = 0;
 274
 275             id->p_current_buffer = id->p_next_gop;
 276
 277             while ( id->p_current_buffer != NULL )
 278             {
 279                 block_t * p_next = id->p_current_buffer->p_next;
 280                 if ( !p_stream->p_sys->b_mpeg4_matrix
 281                        && id->tr.i_wanted_output >= id->tr.i_total_input )
 282                 {
 283                     bs->i_byte_out += id->p_current_buffer->i_buffer;
 284                     id->p_current_buffer->p_next = NULL;
 285                     block_ChainAppend( out, id->p_current_buffer );
 286                 }
 287                 else
 288                 {
 289                     if ( process_frame( p_stream, id, id->p_current_buffer,
 290                                         out, 0 ) < 0 )
 291                     {
 292                         id->p_current_buffer->p_next = NULL;
 293                         block_ChainAppend( out, id->p_current_buffer );
 294                         if ( p_stream->p_sys->b_mpeg4_matrix )
 295                             id->tr.i_wanted_output = id->tr.i_total_input;
 296                     }
 297                     else
 298                     {
 299                         block_Release( id->p_current_buffer );
 300                     }
 301                 }
 302                 id->p_current_buffer = p_next;
 303             }
 304
 305             if ( id->tr.i_wanted_output < id->tr.i_total_input )
 306             {
 307                 i_new_bitrate = (mtime_t)tr->i_current_output * 8000
 308                                     / (id->i_next_gop_duration / 1000);
 309                 if (i_new_bitrate > p_stream->p_sys->i_vbitrate + 300000)
 310                     msg_Err(p_stream, "%lld -> %lld d=%lld",
 311                             i_bitrate, i_new_bitrate,
 312                             id->i_next_gop_duration);
 313                 else
 314                     msg_Dbg(p_stream, "%lld -> %lld d=%lld",
 315                             i_bitrate, i_new_bitrate,
 316                             id->i_next_gop_duration);
 317             }
 318
 319             id->p_next_gop = NULL;
 320             id->i_next_gop_duration = 0;
 321             id->i_next_gop_size = 0;
 322         }
 323     }
 324
 325     return VLC_SUCCESS;
 326 }
 327