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_common.h>
  37 #include <vlc_plugin.h>
  38 #include <vlc_sout.h>
  39 #include <vlc_input.h>
  40
  41 #include "transrate.h"
  42
  43 /*****************************************************************************
  44  * Exported prototypes
  45  *****************************************************************************/
  46 static int      Open    ( vlc_object_t * );
  47 static void     Close   ( vlc_object_t * );
  48
  49 static sout_stream_id_t *Add ( sout_stream_t *, es_format_t * );
  50 static int               Del ( sout_stream_t *, sout_stream_id_t * );
  51 static int               Send( sout_stream_t *, sout_stream_id_t *, block_t * );
  52
  53 static int  transrate_video_process( sout_stream_t *, sout_stream_id_t *, block_t *, block_t ** );
  54
  55 /*****************************************************************************
  56  * Module descriptor
  57  *****************************************************************************/
  58 vlc_module_begin();
  59     set_category( CAT_SOUT );
  60     set_subcategory( SUBCAT_SOUT_STREAM );
  61     set_description( N_("MPEG2 video transrating stream output") );
  62     set_capability( "sout stream", 50 );
  63     add_shortcut( "transrate" );
  64     set_callbacks( Open, Close );
  65 vlc_module_end();
  66
  67 struct sout_stream_sys_t
  68 {
  69     sout_stream_t   *p_out;
  70
  71     int             i_vbitrate;
  72     mtime_t         i_shaping_delay;
  73     int             b_mpeg4_matrix;
  74
  75     mtime_t         i_dts, i_pts;
  76 };
  77
  78 /*****************************************************************************
  79  * Open:
  80  *****************************************************************************/
  81 static int Open( vlc_object_t *p_this )
  82 {
  83     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
  84     sout_stream_sys_t *p_sys;
  85     char *val;
  86
  87     p_sys = malloc( sizeof( sout_stream_sys_t ) );
  88     p_sys->p_out = sout_StreamNew( p_stream->p_sout, p_stream->psz_next );
  89
  90     p_sys->i_vbitrate   = 0;
  91
  92     if( ( val = sout_cfg_find_value( p_stream->p_cfg, "vb" ) ) )
  93     {
  94         p_sys->i_vbitrate = atoi( val );
  95         if( p_sys->i_vbitrate < 16000 )
  96         {
  97             p_sys->i_vbitrate *= 1000;
  98         }
  99     }
 100     else
 101     {
 102         p_sys->i_vbitrate = 3000000;
 103     }
 104
 105     p_sys->i_shaping_delay = 500000;
 106     if( ( val = sout_cfg_find_value( p_stream->p_cfg, "shaping" ) ) )
 107     {
 108         p_sys->i_shaping_delay = (int64_t)atoi( val ) * 1000;
 109         if( p_sys->i_shaping_delay <= 0 )
 110         {
 111             msg_Err( p_stream,
 112                      "invalid shaping (%"PRId64"ms) reseting to 500ms",
 113                      p_sys->i_shaping_delay / 1000 );
 114             p_sys->i_shaping_delay = 500000;
 115         }
 116     }
 117
 118     p_sys->b_mpeg4_matrix = 0;
 119     if( sout_cfg_find( p_stream->p_cfg, "mpeg4-matrix" ) )
 120     {
 121         p_sys->b_mpeg4_matrix = 1;
 122     }
 123
 124     msg_Dbg( p_stream, "codec video %dkb/s max gop=%"PRId64"us",
 125              p_sys->i_vbitrate / 1024, p_sys->i_shaping_delay );
 126
 127     if( !p_sys->p_out )
 128     {
 129         msg_Err( p_stream, "cannot create chain" );
 130         free( p_sys );
 131         return VLC_EGENERIC;
 132     }
 133     p_stream->pf_add    = Add;
 134     p_stream->pf_del    = Del;
 135     p_stream->pf_send   = Send;
 136
 137     p_stream->p_sys     = p_sys;
 138
 139     return VLC_SUCCESS;
 140 }
 141
 142 /*****************************************************************************
 143  * Close:
 144  *****************************************************************************/
 145 static void Close( vlc_object_t * p_this )
 146 {
 147     sout_stream_t       *p_stream = (sout_stream_t *)p_this;
 148     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 149
 150     sout_StreamDelete( p_sys->p_out );
 151     free( p_sys );
 152 }
 153
 154
 155 static sout_stream_id_t * Add( sout_stream_t *p_stream, es_format_t *p_fmt )
 156 {
 157     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 158     sout_stream_id_t    *id;
 159
 160     id = malloc( sizeof( sout_stream_id_t ) );
 161     id->id = NULL;
 162
 163     if( p_fmt->i_cat == VIDEO_ES
 164             && p_fmt->i_codec == VLC_FOURCC('m', 'p', 'g', 'v') )
 165     {
 166         msg_Dbg( p_stream,
 167                  "creating video transrating for fcc=`%4.4s'",
 168                  (char*)&p_fmt->i_codec );
 169
 170         id->p_current_buffer = NULL;
 171         id->p_next_gop = NULL;
 172         id->i_next_gop_duration = 0;
 173         id->i_next_gop_size = 0;
 174         memset( &id->tr, 0, sizeof( transrate_t ) );
 175         id->tr.bs.i_byte_in = id->tr.bs.i_byte_out = 0;
 176         id->tr.mpeg4_matrix = p_sys->b_mpeg4_matrix;
 177
 178         /* open output stream */
 179         id->id = p_sys->p_out->pf_add( p_sys->p_out, p_fmt );
 180         id->b_transrate = true;
 181     }
 182     else
 183     {
 184         msg_Dbg( p_stream, "not transrating a stream (fcc=`%4.4s')", (char*)&p_fmt->i_codec );
 185         id->id = p_sys->p_out->pf_add( p_sys->p_out, p_fmt );
 186         id->b_transrate = false;
 187
 188         if( id->id == NULL )
 189         {
 190             free( id );
 191             return NULL;
 192         }
 193     }
 194
 195     return id;
 196 }
 197
 198 static int     Del      ( sout_stream_t *p_stream, sout_stream_id_t *id )
 199 {
 200     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 201
 202     if( id->id )
 203     {
 204         p_sys->p_out->pf_del( p_sys->p_out, id->id );
 205     }
 206     free( id );
 207
 208     return VLC_SUCCESS;
 209 }
 210
 211 static int Send( sout_stream_t *p_stream, sout_stream_id_t *id,
 212                  block_t *p_buffer )
 213 {
 214     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 215
 216     if( id->b_transrate )
 217     {
 218         block_t *p_buffer_out;
 219         /* be sure to have at least 8 bytes of padding (maybe only 4) */
 220         p_buffer = block_Realloc( p_buffer, 0, p_buffer->i_buffer + 8 );
 221         p_buffer->i_buffer -= 8;
 222         memset( &p_buffer->p_buffer[p_buffer->i_buffer], 0, 8 );
 223
 224         transrate_video_process( p_stream, id, p_buffer, &p_buffer_out );
 225
 226         if( p_buffer_out )
 227         {
 228             return p_sys->p_out->pf_send( p_sys->p_out, id->id, p_buffer_out );
 229         }
 230         return VLC_SUCCESS;
 231     }
 232     else if( id->id != NULL )
 233     {
 234         return p_sys->p_out->pf_send( p_sys->p_out, id->id, p_buffer );
 235     }
 236     else
 237     {
 238         block_Release( p_buffer );
 239         return VLC_EGENERIC;
 240     }
 241 }
 242
 243 static int transrate_video_process( sout_stream_t *p_stream,
 244                sout_stream_id_t *id, block_t *in, block_t **out )
 245 {
 246     transrate_t    *tr = &id->tr;
 247     bs_transrate_t *bs = &tr->bs;
 248
 249     *out = NULL;
 250
 251     while ( in != NULL )
 252     {
 253         block_t * p_next = in->p_next;
 254         int i_flags = in->i_flags;
 255
 256         in->p_next = NULL;
 257         block_ChainAppend( &id->p_next_gop, in );
 258         id->i_next_gop_duration += in->i_length;
 259         id->i_next_gop_size += in->i_buffer;
 260         in = p_next;
 261
 262         if( ((i_flags & BLOCK_FLAG_TYPE_I )
 263                 && id->i_next_gop_duration >= 300000)
 264               || (id->i_next_gop_duration > p_stream->p_sys->i_shaping_delay) )
 265         {
 266             mtime_t i_bitrate = (mtime_t)id->i_next_gop_size * 8000
 267                                     / (id->i_next_gop_duration / 1000);
 268             mtime_t i_new_bitrate;
 269
 270             id->tr.i_total_input = id->i_next_gop_size;
 271             id->tr.i_remaining_input = id->i_next_gop_size;
 272             id->tr.i_wanted_output = (p_stream->p_sys->i_vbitrate)
 273                                     * (id->i_next_gop_duration / 1000) / 8000;
 274             id->tr.i_current_output = 0;
 275
 276             id->p_current_buffer = id->p_next_gop;
 277
 278             while ( id->p_current_buffer != NULL )
 279             {
 280                 block_t * p_next = id->p_current_buffer->p_next;
 281                 if ( !p_stream->p_sys->b_mpeg4_matrix
 282                        && id->tr.i_wanted_output >= id->tr.i_total_input )
 283                 {
 284                     bs->i_byte_out += id->p_current_buffer->i_buffer;
 285                     id->p_current_buffer->p_next = NULL;
 286                     block_ChainAppend( out, id->p_current_buffer );
 287                 }
 288                 else
 289                 {
 290                     if ( process_frame( p_stream, id, id->p_current_buffer,
 291                                         out, 0 ) < 0 )
 292                     {
 293                         id->p_current_buffer->p_next = NULL;
 294                         block_ChainAppend( out, id->p_current_buffer );
 295                         if ( p_stream->p_sys->b_mpeg4_matrix )
 296                             id->tr.i_wanted_output = id->tr.i_total_input;
 297                     }
 298                     else
 299                     {
 300                         block_Release( id->p_current_buffer );
 301                     }
 302                 }
 303                 id->p_current_buffer = p_next;
 304             }
 305
 306             if ( id->tr.i_wanted_output < id->tr.i_total_input )
 307             {
 308                 i_new_bitrate = (mtime_t)tr->i_current_output * 8000
 309                                     / (id->i_next_gop_duration / 1000);
 310                 if (i_new_bitrate > p_stream->p_sys->i_vbitrate + 300000)
 311                     msg_Err(p_stream, "%lld -> %lld d=%lld",
 312                             i_bitrate, i_new_bitrate,
 313                             id->i_next_gop_duration);
 314                 else
 315                     msg_Dbg(p_stream, "%lld -> %lld d=%lld",
 316                             i_bitrate, i_new_bitrate,
 317                             id->i_next_gop_duration);
 318             }
 319
 320             id->p_next_gop = NULL;
 321             id->i_next_gop_duration = 0;
 322             id->i_next_gop_size = 0;
 323         }
 324     }
 325
 326     return VLC_SUCCESS;
 327 }
 328