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vlc/modules/demux/rawvid.c

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/*****************************************************************************
* rawvid.c : raw video input module for vlc
*****************************************************************************
* Copyright (C) 2007 the VideoLAN team
* $Id$
*
* Authors: Gildas Bazin <gbazin@videolan.org>
* Antoine Cellerier <dionoea at videolan d.t org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_demux.h>
#include <assert.h>
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
#define FPS_TEXT N_("Frames per Second")
#define FPS_LONGTEXT N_("This is the desired frame rate when " \
"playing raw video streams. In the form 30000/1001 or 29.97")
#define WIDTH_TEXT N_("Width")
#define WIDTH_LONGTEXT N_("This specifies the width in pixels of the raw " \
"video stream.")
#define HEIGHT_TEXT N_("Height")
#define HEIGHT_LONGTEXT N_("This specifies the height in pixels of the raw " \
"video stream.")
#define CHROMA_TEXT N_("Force chroma (Use carefully)")
#define CHROMA_LONGTEXT N_("Force chroma. This is a four character string.")
#define ASPECT_RATIO_TEXT N_("Aspect ratio")
#define ASPECT_RATIO_LONGTEXT N_( \
"Aspect ratio (4:3, 16:9). Default assumes square pixels." )
vlc_module_begin ()
set_shortname( "Raw Video" )
set_description( N_("Raw video demuxer") )
set_capability( "demux", 10 )
set_category( CAT_INPUT )
set_subcategory( SUBCAT_INPUT_DEMUX )
set_callbacks( Open, Close )
add_shortcut( "rawvideo" )
add_string( "rawvid-fps", NULL, NULL, FPS_TEXT, FPS_LONGTEXT, false )
add_integer( "rawvid-width", 0, 0, WIDTH_TEXT, WIDTH_LONGTEXT, 0 )
add_integer( "rawvid-height", 0, 0, HEIGHT_TEXT, HEIGHT_LONGTEXT, 0 )
add_string( "rawvid-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
true )
add_string( "rawvid-aspect-ratio", NULL, NULL,
ASPECT_RATIO_TEXT, ASPECT_RATIO_LONGTEXT, true )
vlc_module_end ()
/*****************************************************************************
* Definitions of structures used by this plugin
*****************************************************************************/
struct demux_sys_t
{
int frame_size;
es_out_id_t *p_es_video;
es_format_t fmt_video;
date_t pcr;
bool b_y4m;
};
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Demux( demux_t * );
static int Control( demux_t *, int i_query, va_list args );
struct preset_t
{
const char *psz_ext;
int i_width;
int i_height;
unsigned u_fps_num;
unsigned u_fps_den;
unsigned u_ar_num;
unsigned u_ar_den;
vlc_fourcc_t i_chroma;
};
static const struct preset_t p_presets[] =
{
{ "sqcif", 128, 96, 30000, 1001, 4,3, VLC_CODEC_YV12 },
{ "qcif", 176, 144, 30000, 1001, 4,3, VLC_CODEC_YV12 },
{ "cif", 352, 288, 30000, 1001, 4,3, VLC_CODEC_YV12 },
{ "4cif", 704, 576, 30000, 1001, 4,3, VLC_CODEC_YV12 },
{ "16cif", 1408, 1152, 30000, 1001, 4,3, VLC_CODEC_YV12 },
{ "yuv", 176, 144, 25, 1, 4,3, VLC_CODEC_YV12 },
{ NULL, 0, 0, 0, 0, 0,0, 0 }
};
/*****************************************************************************
* Open: initializes raw DV demux structures
*****************************************************************************/
static int Open( vlc_object_t * p_this )
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys;
int i_width=-1, i_height=-1;
unsigned u_fps_num=0, u_fps_den=1;
char *psz_ext;
vlc_fourcc_t i_chroma;
unsigned int i_aspect = 0;
const struct preset_t *p_preset = NULL;
const uint8_t *p_peek;
bool b_valid = false;
bool b_y4m = false;
if( stream_Peek( p_demux->s, &p_peek, 9 ) == 9 )
{
/* http://wiki.multimedia.cx/index.php?title=YUV4MPEG2 */
if( !strncmp( (char *)p_peek, "YUV4MPEG2", 9 ) )
{
b_valid = true;
b_y4m = true;
}
}
/* guess preset based on file extension */
psz_ext = strrchr( p_demux->psz_path, '.' );
if( psz_ext )
{
psz_ext++;
for( int i = 0; p_presets[i].psz_ext ; i++ )
{
if( !strcasecmp( psz_ext, p_presets[i].psz_ext ) )
{
p_preset = &p_presets[i];
b_valid = true;
break;
}
}
}
if( !b_valid && !p_demux->b_force )
return VLC_EGENERIC;
/* Set p_input field */
p_demux->pf_demux = Demux;
p_demux->pf_control = Control;
p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
if( !p_sys )
return VLC_ENOMEM;
p_sys->b_y4m = b_y4m;
/* guess the parameters based on the preset */
if( p_preset )
{
i_width = p_preset->i_width;
i_height = p_preset->i_height;
u_fps_num = p_preset->u_fps_num;
u_fps_den = p_preset->u_fps_den;
i_aspect = VOUT_ASPECT_FACTOR * p_preset->u_ar_num / p_preset->u_ar_den;
i_chroma = p_preset->i_chroma;
}
/* override presets if yuv4mpeg2 */
if( b_y4m )
{
char *psz = stream_ReadLine( p_demux->s );
char *psz_buf;
int a = 1;
int b = 1;
/* The string will start with "YUV4MPEG2" */
assert( strlen(psz) >= 9 );
/* NB, it is not possible to handle interlaced here, since the
* interlaced picture flags are in picture_t not block_t */
#define READ_FRAC( key, num, den ) do { \
psz_buf = strstr( psz+9, key );\
if( psz_buf )\
{\
char *end = strchr( psz_buf+1, ' ' );\
char *sep;\
if( end ) *end = '\0';\
sep = strchr( psz_buf+1, ':' );\
if( sep )\
{\
*sep = '\0';\
den = atoi( sep+1 );\
}\
else\
{\
den = 1;\
}\
num = atoi( psz_buf+2 );\
if( sep ) *sep = ':';\
if( end ) *end = ' ';\
} } while(0)
READ_FRAC( " W", i_width, a );
READ_FRAC( " H", i_height, a );
READ_FRAC( " F", u_fps_num, u_fps_den );
READ_FRAC( " A", a, b );
#undef READ_FRAC
/* Try to calculate aspect ratio here, rather than store ratio
* in u_ar_{num,den}, since width may be overridden by then.
* Plus, a:b is sar. */
if( b != 0 )
i_aspect = VOUT_ASPECT_FACTOR * a * i_width / (b * i_height);
psz_buf = strstr( psz+9, " C" );
if( psz_buf )
{
static const struct { const char *psz_name; vlc_fourcc_t i_fcc; } formats[] =
{
{ "420jpeg", VLC_CODEC_I420 },
{ "420paldv", VLC_CODEC_I420 },
{ "420", VLC_CODEC_I420 },
{ "422", VLC_CODEC_I422 },
{ "444", VLC_CODEC_I444 },
{ "mono", VLC_CODEC_GREY },
{ NULL, 0 }
};
bool b_found = false;
char *psz_end = strchr( psz_buf+1, ' ' );
if( psz_end )
*psz_end = '\0';
psz_buf += 2;
for( int i = 0; formats[i].psz_name != NULL; i++ )
{
if( !strncmp( psz_buf, formats[i].psz_name, strlen(formats[i].psz_name) ) )
{
i_chroma = formats[i].i_fcc;
b_found = true;
break;
}
}
if( !b_found )
msg_Warn( p_demux, "Unknown YUV4MPEG2 chroma type \"%s\"", psz_buf );
if( psz_end )
*psz_end = ' ';
}
free( psz );
}
/* allow the user to override anything guessed from the input */
int i_tmp;
i_tmp = var_CreateGetInteger( p_demux, "rawvid-width" );
if( i_tmp ) i_width = i_tmp;
i_tmp = var_CreateGetInteger( p_demux, "rawvid-height" );
if( i_tmp ) i_height = i_tmp;
char *psz_tmp;
psz_tmp = var_CreateGetNonEmptyString( p_demux, "rawvid-chroma" );
if( psz_tmp )
{
if( strlen( psz_tmp ) != 4 )
{
msg_Err( p_demux, "Invalid fourcc format/chroma specification %s"
" expecting four characters eg, UYVY", psz_tmp );
free( psz_tmp );
goto error;
}
memcpy( &i_chroma, psz_tmp, 4 );
msg_Dbg( p_demux, "Forcing chroma to 0x%.8x (%4.4s)", i_chroma, (char*)&i_chroma );
free( psz_tmp );
}
psz_tmp = var_CreateGetNonEmptyString( p_demux, "rawvid-fps" );
if( psz_tmp )
{
char *p_ptr;
/* fps can either be n/d or q.f
* for accuracy, avoid representation in float */
u_fps_num = strtol( psz_tmp, &p_ptr, 10 );
if( *p_ptr == '/' )
{
p_ptr++;
u_fps_den = strtol( p_ptr, NULL, 10 );
}
else if( *p_ptr == '.' )
{
char *p_end;
p_ptr++;
int i_frac = strtol( p_ptr, &p_end, 10 );
u_fps_den = (p_end - p_ptr) * 10;
if( !u_fps_den )
u_fps_den = 1;
u_fps_num = u_fps_num * u_fps_den + i_frac;
}
else if( *p_ptr == '\0')
{
u_fps_den = 1;
}
free( psz_tmp );
}
psz_tmp = var_CreateGetNonEmptyString( p_demux, "rawvid-aspect-ratio" );
if( psz_tmp )
{
char *psz_denominator = strchr( psz_tmp, ':' );
if( psz_denominator )
{
*psz_denominator++ = '\0';
i_aspect = atoi( psz_tmp ) * VOUT_ASPECT_FACTOR
/ atoi( psz_denominator );
}
free( psz_tmp );
}
/* moan about anything wrong */
if( i_width <= 0 || i_height <= 0 )
{
msg_Err( p_demux, "width and height must be strictly positive." );
goto error;
}
if( !u_fps_num || !u_fps_den )
{
msg_Err( p_demux, "invalid or no framerate specified." );
goto error;
}
/* fixup anything missing with sensible assumptions */
if( !i_aspect )
{
/* assume 1:1 sar */
i_aspect = i_width * VOUT_ASPECT_FACTOR / i_height;
}
es_format_Init( &p_sys->fmt_video, VIDEO_ES, i_chroma );
video_format_Setup( &p_sys->fmt_video.video,
i_chroma, i_width, i_height, i_aspect );
vlc_ureduce( &p_sys->fmt_video.video.i_frame_rate,
&p_sys->fmt_video.video.i_frame_rate_base,
u_fps_num, u_fps_den, 0);
date_Init( &p_sys->pcr, p_sys->fmt_video.video.i_frame_rate,
p_sys->fmt_video.video.i_frame_rate_base );
date_Set( &p_sys->pcr, 1 );
if( !p_sys->fmt_video.video.i_bits_per_pixel )
{
msg_Err( p_demux, "Unsupported chroma 0x%.8x (%4.4s)", i_chroma,
(char*)&i_chroma );
goto error;
}
p_sys->frame_size = i_width * i_height
* p_sys->fmt_video.video.i_bits_per_pixel / 8;
p_sys->p_es_video = es_out_Add( p_demux->out, &p_sys->fmt_video );
return VLC_SUCCESS;
error:
free( p_sys );
return VLC_EGENERIC;
}
/*****************************************************************************
* Close: frees unused data
*****************************************************************************/
static void Close( vlc_object_t *p_this )
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys = p_demux->p_sys;
free( p_sys );
}
/*****************************************************************************
* Demux: reads and demuxes data packets
*****************************************************************************
* Returns -1 in case of error, 0 in case of EOF, 1 otherwise
*****************************************************************************/
static int Demux( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
block_t *p_block;
mtime_t i_pcr = date_Get( &p_sys->pcr );
/* Call the pace control */
es_out_Control( p_demux->out, ES_OUT_SET_PCR, i_pcr );
if( p_sys->b_y4m )
{
/* Skip the frame header */
/* Skip "FRAME" */
if( stream_Read( p_demux->s, NULL, 5 ) < 5 )
return 0;
/* Find \n */
for( ;; )
{
uint8_t b;
if( stream_Read( p_demux->s, &b, 1 ) < 1 )
return 0;
if( b == 0x0a )
break;
}
}
if( ( p_block = stream_Block( p_demux->s, p_sys->frame_size ) ) == NULL )
{
/* EOF */
return 0;
}
p_block->i_dts = p_block->i_pts = i_pcr;
es_out_Send( p_demux->out, p_sys->p_es_video, p_block );
date_Increment( &p_sys->pcr, 1 );
return 1;
}
/*****************************************************************************
* Control:
*****************************************************************************/
static int Control( demux_t *p_demux, int i_query, va_list args )
{
demux_sys_t *p_sys = p_demux->p_sys;
/* (2**31)-1 is insufficient to store 1080p50 4:4:4. */
const int64_t i_bps = 8LL * p_sys->frame_size * p_sys->pcr.i_divider_num /
p_sys->pcr.i_divider_den;
/* XXX: DEMUX_SET_TIME is precise here */
return demux_vaControlHelper( p_demux->s, 0, -1, i_bps,
p_sys->frame_size, i_query, args );
}
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