1 /*****************************************************************************
2 * transrate.c: MPEG2 video transrating module
3 *****************************************************************************
4 * Copyright (C) 2003 the VideoLAN team
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
8 * Laurent Aimar <fenrir@via.ecp.fr>
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.
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.
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 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
36 #include <vlc_common.h>
37 #include <vlc_plugin.h>
39 #include <vlc_input.h>
40 #include <vlc_block.h>
42 #include "transrate.h"
44 /*****************************************************************************
46 *****************************************************************************/
47 static int Open ( vlc_object_t * );
48 static void Close ( vlc_object_t * );
50 static sout_stream_id_t *Add ( sout_stream_t *, es_format_t * );
51 static int Del ( sout_stream_t *, sout_stream_id_t * );
52 static int Send( sout_stream_t *, sout_stream_id_t *, block_t * );
54 static int transrate_video_process( sout_stream_t *, sout_stream_id_t *, block_t *, block_t ** );
56 /*****************************************************************************
58 *****************************************************************************/
60 #define VB_TEXT N_("Video bitrate")
61 /*xgettext:no-c-format*/
62 #define VB_LONGTEXT N_( \
63 "New target video bitrate. Quality is ok for -10/15\% of the original" \
66 #define SHAPING_TEXT N_("Shaping delay")
67 #define SHAPING_LONGTEXT N_( \
68 "Amount of data used for transrating in ms." )
70 #define MPEG4_MATRIX_TEXT N_("Use MPEG4 matrix")
71 #define MPEG4_MATRIX_LONGTEXT N_( \
72 "Use the MPEG4 quantification matrix." )
74 #define SOUT_CFG_PREFIX "sout-transrate-"
77 set_category( CAT_SOUT )
78 set_subcategory( SUBCAT_SOUT_STREAM )
79 set_description( N_("MPEG2 video transrating stream output") )
80 set_capability( "sout stream", 50 )
81 add_shortcut( "transrate" )
82 set_shortname( N_("Transrate") )
83 set_callbacks( Open, Close )
85 add_integer( SOUT_CFG_PREFIX "vb", 3 * 100 * 1000, NULL,
86 VB_TEXT, VB_LONGTEXT, false )
87 add_integer( SOUT_CFG_PREFIX "shaping", 500, NULL,
88 SHAPING_TEXT, SHAPING_LONGTEXT, false )
89 add_bool( SOUT_CFG_PREFIX "mpeg4-matrix", false, NULL,
90 MPEG4_MATRIX_TEXT, MPEG4_MATRIX_LONGTEXT, false )
93 static const char *const ppsz_sout_options[] = {
94 "vb", "shaping", "mpeg4-matrix", NULL
97 struct sout_stream_sys_t
102 mtime_t i_shaping_delay;
105 mtime_t i_dts, i_pts;
108 /*****************************************************************************
110 *****************************************************************************/
111 static int Open( vlc_object_t *p_this )
113 sout_stream_t *p_stream = (sout_stream_t*)p_this;
114 sout_stream_sys_t *p_sys;
116 p_sys = malloc( sizeof( sout_stream_sys_t ) );
117 p_sys->p_out = sout_StreamNew( p_stream->p_sout, p_stream->psz_next );
119 config_ChainParse( p_stream, SOUT_CFG_PREFIX, ppsz_sout_options,
121 p_sys->i_vbitrate = var_CreateGetInteger( p_stream, SOUT_CFG_PREFIX "vb" );
122 if( p_sys->i_vbitrate < 16000 )
123 p_sys->i_vbitrate *= 1000;
125 p_sys->i_shaping_delay = var_CreateGetInteger( p_stream,
126 SOUT_CFG_PREFIX "shaping" ) * 1000;
127 if( p_sys->i_shaping_delay <= 0 )
130 "invalid shaping (%"PRId64"ms) reseting to 500ms",
131 p_sys->i_shaping_delay / 1000 );
132 p_sys->i_shaping_delay = 500000;
135 p_sys->b_mpeg4_matrix = var_CreateGetBool( p_stream,
136 SOUT_CFG_PREFIX "mpeg4-matrix" );
138 msg_Dbg( p_stream, "codec video %dkb/s max gop=%"PRId64"us",
139 p_sys->i_vbitrate / 1024, p_sys->i_shaping_delay );
143 msg_Err( p_stream, "cannot create chain" );
147 p_stream->pf_add = Add;
148 p_stream->pf_del = Del;
149 p_stream->pf_send = Send;
151 p_stream->p_sys = p_sys;
156 /*****************************************************************************
158 *****************************************************************************/
159 static void Close( vlc_object_t * p_this )
161 sout_stream_t *p_stream = (sout_stream_t *)p_this;
162 sout_stream_sys_t *p_sys = p_stream->p_sys;
164 sout_StreamDelete( p_sys->p_out );
169 static sout_stream_id_t * Add( sout_stream_t *p_stream, es_format_t *p_fmt )
171 sout_stream_sys_t *p_sys = p_stream->p_sys;
172 sout_stream_id_t *id;
174 id = malloc( sizeof( sout_stream_id_t ) );
177 if( p_fmt->i_cat == VIDEO_ES
178 && p_fmt->i_codec == VLC_FOURCC('m', 'p', 'g', 'v') )
181 "creating video transrating for fcc=`%4.4s'",
182 (char*)&p_fmt->i_codec );
184 id->p_current_buffer = NULL;
185 id->p_next_gop = NULL;
186 id->i_next_gop_duration = 0;
187 id->i_next_gop_size = 0;
188 memset( &id->tr, 0, sizeof( transrate_t ) );
189 id->tr.bs.i_byte_in = id->tr.bs.i_byte_out = 0;
190 id->tr.mpeg4_matrix = p_sys->b_mpeg4_matrix;
192 /* open output stream */
193 id->id = p_sys->p_out->pf_add( p_sys->p_out, p_fmt );
194 id->b_transrate = true;
198 msg_Dbg( p_stream, "not transrating a stream (fcc=`%4.4s')", (char*)&p_fmt->i_codec );
199 id->id = p_sys->p_out->pf_add( p_sys->p_out, p_fmt );
200 id->b_transrate = false;
212 static int Del ( sout_stream_t *p_stream, sout_stream_id_t *id )
214 sout_stream_sys_t *p_sys = p_stream->p_sys;
218 p_sys->p_out->pf_del( p_sys->p_out, id->id );
225 static int Send( sout_stream_t *p_stream, sout_stream_id_t *id,
228 sout_stream_sys_t *p_sys = p_stream->p_sys;
230 if( id->b_transrate )
232 block_t *p_buffer_out;
233 /* be sure to have at least 8 bytes of padding (maybe only 4) */
234 p_buffer = block_Realloc( p_buffer, 0, p_buffer->i_buffer + 8 );
235 p_buffer->i_buffer -= 8;
236 memset( &p_buffer->p_buffer[p_buffer->i_buffer], 0, 8 );
238 transrate_video_process( p_stream, id, p_buffer, &p_buffer_out );
242 return p_sys->p_out->pf_send( p_sys->p_out, id->id, p_buffer_out );
246 else if( id->id != NULL )
248 return p_sys->p_out->pf_send( p_sys->p_out, id->id, p_buffer );
252 block_Release( p_buffer );
257 static int transrate_video_process( sout_stream_t *p_stream,
258 sout_stream_id_t *id, block_t *in, block_t **out )
260 transrate_t *tr = &id->tr;
261 bs_transrate_t *bs = &tr->bs;
267 block_t * p_next = in->p_next;
268 int i_flags = in->i_flags;
271 block_ChainAppend( &id->p_next_gop, in );
272 id->i_next_gop_duration += in->i_length;
273 id->i_next_gop_size += in->i_buffer;
276 if( ((i_flags & BLOCK_FLAG_TYPE_I )
277 && id->i_next_gop_duration >= 300000)
278 || (id->i_next_gop_duration > p_stream->p_sys->i_shaping_delay) )
280 mtime_t i_bitrate = (mtime_t)id->i_next_gop_size * 8000
281 / (id->i_next_gop_duration / 1000);
282 mtime_t i_new_bitrate;
284 id->tr.i_total_input = id->i_next_gop_size;
285 id->tr.i_remaining_input = id->i_next_gop_size;
286 id->tr.i_wanted_output = (p_stream->p_sys->i_vbitrate)
287 * (id->i_next_gop_duration / 1000) / 8000;
288 id->tr.i_current_output = 0;
290 id->p_current_buffer = id->p_next_gop;
292 while ( id->p_current_buffer != NULL )
294 block_t * p_next = id->p_current_buffer->p_next;
295 if ( !p_stream->p_sys->b_mpeg4_matrix
296 && id->tr.i_wanted_output >= id->tr.i_total_input )
298 bs->i_byte_out += id->p_current_buffer->i_buffer;
299 id->p_current_buffer->p_next = NULL;
300 block_ChainAppend( out, id->p_current_buffer );
304 if ( process_frame( p_stream, id, id->p_current_buffer,
307 id->p_current_buffer->p_next = NULL;
308 block_ChainAppend( out, id->p_current_buffer );
309 if ( p_stream->p_sys->b_mpeg4_matrix )
310 id->tr.i_wanted_output = id->tr.i_total_input;
314 block_Release( id->p_current_buffer );
317 id->p_current_buffer = p_next;
320 if ( id->tr.i_wanted_output < id->tr.i_total_input )
322 i_new_bitrate = (mtime_t)tr->i_current_output * 8000
323 / (id->i_next_gop_duration / 1000);
324 if (i_new_bitrate > p_stream->p_sys->i_vbitrate + 300000)
325 msg_Err(p_stream, "%"PRId64" -> %"PRId64" d=%"PRId64,
326 i_bitrate, i_new_bitrate,
327 id->i_next_gop_duration);
329 msg_Dbg(p_stream, "%"PRId64" -> %"PRId64" d=%"PRId64,
330 i_bitrate, i_new_bitrate,
331 id->i_next_gop_duration);
334 id->p_next_gop = NULL;
335 id->i_next_gop_duration = 0;
336 id->i_next_gop_size = 0;