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 VideoLAN
   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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #define NDEBUG 1
  31 #include <assert.h>
  32 #include <math.h>
  33
  34 #include <vlc/vlc.h>
  35 #include <vlc/sout.h>
  36 #include <vlc/input.h>
  37
  38 #include "transrate.h"
  39
  40 /*****************************************************************************
  41  * Exported prototypes
  42  *****************************************************************************/
  43 static int      Open    ( vlc_object_t * );
  44 static void     Close   ( vlc_object_t * );
  45
  46 static sout_stream_id_t *Add ( sout_stream_t *, es_format_t * );
  47 static int               Del ( sout_stream_t *, sout_stream_id_t * );
  48 static int               Send( sout_stream_t *, sout_stream_id_t *, block_t * );
  49
  50 static int  transrate_video_process( sout_stream_t *, sout_stream_id_t *, block_t *, block_t ** );
  51
  52 /*****************************************************************************
  53  * Module descriptor
  54  *****************************************************************************/
  55 vlc_module_begin();
  56     set_category( CAT_SOUT );
  57     set_subcategory( SUBCAT_SOUT_STREAM );
  58     set_description( _("MPEG2 video transrating stream output") );
  59     set_capability( "sout stream", 50 );
  60     add_shortcut( "transrate" );
  61     set_callbacks( Open, Close );
  62 vlc_module_end();
  63
  64 struct sout_stream_sys_t
  65 {
  66     sout_stream_t   *p_out;
  67
  68     int             i_vbitrate;
  69     mtime_t         i_shaping_delay;
  70     int             b_mpeg4_matrix;
  71
  72     mtime_t         i_dts, i_pts;
  73 };
  74
  75 /*****************************************************************************
  76  * Open:
  77  *****************************************************************************/
  78 static int Open( vlc_object_t *p_this )
  79 {
  80     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
  81     sout_stream_sys_t *p_sys;
  82     char *val;
  83
  84     p_sys = malloc( sizeof( sout_stream_sys_t ) );
  85     p_sys->p_out = sout_StreamNew( p_stream->p_sout, p_stream->psz_next );
  86
  87     p_sys->i_vbitrate   = 0;
  88
  89     if( ( val = sout_cfg_find_value( p_stream->p_cfg, "vb" ) ) )
  90     {
  91         p_sys->i_vbitrate = atoi( val );
  92         if( p_sys->i_vbitrate < 16000 )
  93         {
  94             p_sys->i_vbitrate *= 1000;
  95         }
  96     }
  97     else
  98     {
  99         p_sys->i_vbitrate = 3000000;
 100     }
 101
 102     p_sys->i_shaping_delay = 500000;
 103     if( ( val = sout_cfg_find_value( p_stream->p_cfg, "shaping" ) ) )
 104     {
 105         p_sys->i_shaping_delay = (int64_t)atoi( val ) * 1000;
 106         if( p_sys->i_shaping_delay <= 0 )
 107         {
 108             msg_Err( p_stream,
 109                      "invalid shaping ("I64Fd"ms) reseting to 500ms",
 110                      p_sys->i_shaping_delay / 1000 );
 111             p_sys->i_shaping_delay = 500000;
 112         }
 113     }
 114
 115     p_sys->b_mpeg4_matrix = 0;
 116     if( sout_cfg_find( p_stream->p_cfg, "mpeg4-matrix" ) )
 117     {
 118         p_sys->b_mpeg4_matrix = 1;
 119     }
 120
 121     msg_Dbg( p_stream, "codec video %dkb/s max gop="I64Fd"us",
 122              p_sys->i_vbitrate / 1024, p_sys->i_shaping_delay );
 123
 124     if( !p_sys->p_out )
 125     {
 126         msg_Err( p_stream, "cannot create chain" );
 127         free( p_sys );
 128         return VLC_EGENERIC;
 129     }
 130     p_stream->pf_add    = Add;
 131     p_stream->pf_del    = Del;
 132     p_stream->pf_send   = Send;
 133
 134     p_stream->p_sys     = p_sys;
 135
 136     return VLC_SUCCESS;
 137 }
 138
 139 /*****************************************************************************
 140  * Close:
 141  *****************************************************************************/
 142 static void Close( vlc_object_t * p_this )
 143 {
 144     sout_stream_t       *p_stream = (sout_stream_t *)p_this;
 145     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 146
 147     sout_StreamDelete( p_sys->p_out );
 148     free( p_sys );
 149 }
 150
 151
 152 static sout_stream_id_t * Add( sout_stream_t *p_stream, es_format_t *p_fmt )
 153 {
 154     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 155     sout_stream_id_t    *id;
 156
 157     id = malloc( sizeof( sout_stream_id_t ) );
 158     id->id = NULL;
 159
 160     if( p_fmt->i_cat == VIDEO_ES
 161             && p_fmt->i_codec == VLC_FOURCC('m', 'p', 'g', 'v') )
 162     {
 163         msg_Dbg( p_stream,
 164                  "creating video transrating for fcc=`%4.4s'",
 165                  (char*)&p_fmt->i_codec );
 166
 167         id->p_current_buffer = NULL;
 168         id->p_next_gop = NULL;
 169         id->i_next_gop_duration = 0;
 170         id->i_next_gop_size = 0;
 171         memset( &id->tr, 0, sizeof( transrate_t ) );
 172         id->tr.bs.i_byte_in = id->tr.bs.i_byte_out = 0;
 173         id->tr.mpeg4_matrix = p_sys->b_mpeg4_matrix;
 174
 175         /* open output stream */
 176         id->id = p_sys->p_out->pf_add( p_sys->p_out, p_fmt );
 177         id->b_transrate = VLC_TRUE;
 178     }
 179     else
 180     {
 181         msg_Dbg( p_stream, "not transrating a stream (fcc=`%4.4s')", (char*)&p_fmt->i_codec );
 182         id->id = p_sys->p_out->pf_add( p_sys->p_out, p_fmt );
 183         id->b_transrate = VLC_FALSE;
 184
 185         if( id->id == NULL )
 186         {
 187             free( id );
 188             return NULL;
 189         }
 190     }
 191
 192     return id;
 193 }
 194
 195 static int     Del      ( sout_stream_t *p_stream, sout_stream_id_t *id )
 196 {
 197     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 198
 199     if( id->id )
 200     {
 201         p_sys->p_out->pf_del( p_sys->p_out, id->id );
 202     }
 203     free( id );
 204
 205     return VLC_SUCCESS;
 206 }
 207
 208 static int Send( sout_stream_t *p_stream, sout_stream_id_t *id,
 209                  block_t *p_buffer )
 210 {
 211     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 212
 213     if( id->b_transrate )
 214     {
 215         block_t *p_buffer_out;
 216         /* be sure to have at least 8 bytes of padding (maybe only 4) */
 217         p_buffer = block_Realloc( p_buffer, 0, p_buffer->i_buffer + 8 );
 218         p_buffer->i_buffer -= 8;
 219         memset( &p_buffer->p_buffer[p_buffer->i_buffer], 0, 8 );
 220
 221         transrate_video_process( p_stream, id, p_buffer, &p_buffer_out );
 222
 223         if( p_buffer_out )
 224         {
 225             return p_sys->p_out->pf_send( p_sys->p_out, id->id, p_buffer_out );
 226         }
 227         return VLC_SUCCESS;
 228     }
 229     else if( id->id != NULL )
 230     {
 231         return p_sys->p_out->pf_send( p_sys->p_out, id->id, p_buffer );
 232     }
 233     else
 234     {
 235         block_Release( p_buffer );
 236         return VLC_EGENERIC;
 237     }
 238 }
 239
 240 static int transrate_video_process( sout_stream_t *p_stream,
 241                sout_stream_id_t *id, block_t *in, block_t **out )
 242 {
 243     transrate_t    *tr = &id->tr;
 244     bs_transrate_t *bs = &tr->bs;
 245
 246     *out = NULL;
 247
 248     while ( in != NULL )
 249     {
 250         block_t * p_next = in->p_next;
 251         int i_flags = in->i_flags;
 252
 253         in->p_next = NULL;
 254         block_ChainAppend( &id->p_next_gop, in );
 255         id->i_next_gop_duration += in->i_length;
 256         id->i_next_gop_size += in->i_buffer;
 257         in = p_next;
 258
 259         if( ((i_flags & BLOCK_FLAG_TYPE_I )
 260                 && id->i_next_gop_duration >= 300000)
 261               || (id->i_next_gop_duration > p_stream->p_sys->i_shaping_delay) )
 262         {
 263             mtime_t i_bitrate = (mtime_t)id->i_next_gop_size * 8000
 264                                     / (id->i_next_gop_duration / 1000);
 265             mtime_t i_new_bitrate;
 266
 267             id->tr.i_total_input = id->i_next_gop_size;
 268             id->tr.i_remaining_input = id->i_next_gop_size;
 269             id->tr.i_wanted_output = (p_stream->p_sys->i_vbitrate)
 270                                     * (id->i_next_gop_duration / 1000) / 8000;
 271             id->tr.i_current_output = 0;
 272
 273             id->p_current_buffer = id->p_next_gop;
 274
 275             while ( id->p_current_buffer != NULL )
 276             {
 277                 block_t * p_next = id->p_current_buffer->p_next;
 278                 if ( !p_stream->p_sys->b_mpeg4_matrix
 279                        && id->tr.i_wanted_output >= id->tr.i_total_input )
 280                 {
 281                     bs->i_byte_out += id->p_current_buffer->i_buffer;
 282                     id->p_current_buffer->p_next = NULL;
 283                     block_ChainAppend( out, id->p_current_buffer );
 284                 }
 285                 else
 286                 {
 287                     if ( process_frame( p_stream, id, id->p_current_buffer,
 288                                         out, 0 ) < 0 )
 289                     {
 290                         id->p_current_buffer->p_next = NULL;
 291                         block_ChainAppend( out, id->p_current_buffer );
 292                         if ( p_stream->p_sys->b_mpeg4_matrix )
 293                             id->tr.i_wanted_output = id->tr.i_total_input;
 294                     }
 295                     else
 296                     {
 297                         block_Release( id->p_current_buffer );
 298                     }
 299                 }
 300                 id->p_current_buffer = p_next;
 301             }
 302
 303             if ( id->tr.i_wanted_output < id->tr.i_total_input )
 304             {
 305                 i_new_bitrate = (mtime_t)tr->i_current_output * 8000
 306                                     / (id->i_next_gop_duration / 1000);
 307                 if (i_new_bitrate > p_stream->p_sys->i_vbitrate + 300000)
 308                     msg_Err(p_stream, "%lld -> %lld d=%lld",
 309                             i_bitrate, i_new_bitrate,
 310                             id->i_next_gop_duration);
 311                 else
 312                     msg_Dbg(p_stream, "%lld -> %lld d=%lld",
 313                             i_bitrate, i_new_bitrate,
 314                             id->i_next_gop_duration);
 315             }
 316
 317             id->p_next_gop = NULL;
 318             id->i_next_gop_duration = 0;
 319             id->i_next_gop_size = 0;
 320         }
 321     }
 322
 323     return VLC_SUCCESS;
 324 }
 325