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Towards Philips OGT (SVCD subtitle) handling.

pull/2/head
Rocky Bernstein 23 years ago
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  1. 465
      modules/codec/ogt/ogt.c
  2. 144
      modules/codec/ogt/ogt.h

465
modules/codec/ogt/ogt.c
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/*****************************************************************************
* ogt.c : Overlay Graphics Text (SVCD subtitles) decoder thread
*****************************************************************************
* Copyright (C) 2003 VideoLAN
* $Id: ogt.c,v 1.1 2003/12/07 22:14:26 rocky Exp $
*
* Authors: Rocky Bernstein
* based on code from:
* Julio Sanchez Fernandez (http://subhandler.sourceforge.net)
* Samuel Hocevar <sam@zoy.org>
* Laurent Aimar <fenrir@via.ecp.fr>
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <vlc/vlc.h>
#include <vlc/vout.h>
#include <vlc/decoder.h>
#include "ogt.h"
#define DEBUG_LONGTEXT N_( \
"This integer when viewed in binary is a debugging mask\n" \
"external call 1\n" \
"all calls 2\n" \
"misc 4\n" )
/*****************************************************************************
* Module descriptor.
*****************************************************************************/
static int DecoderOpen ( vlc_object_t * );
static int PacketizerOpen( vlc_object_t * );
static void Close ( vlc_object_t * );
vlc_module_begin();
set_description( _("SVCD subtitle decoder") );
set_capability( "decoder", 50 );
set_callbacks( DecoderOpen, Close );
add_integer ( MODULE_STRING "-debug", 0, NULL,
N_("set debug mask for additional debugging."),
N_(DEBUG_LONGTEXT), VLC_TRUE );
add_submodule();
set_description( _("SVCD subtitle packetizer") );
set_capability( "packetizer", 50 );
set_callbacks( PacketizerOpen, Close );
vlc_module_end();
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static vout_thread_t *FindVout( decoder_t *);
static block_t *Reassemble( decoder_t *, block_t ** );
static void Decode ( decoder_t *, block_t ** );
static block_t *Packetize( decoder_t *, block_t ** );
/*****************************************************************************
InitSubtitleBlock:
Initialize so the next packet will start off a new one.
*****************************************************************************/
static void
InitSubtitleBlock( decoder_sys_t * p_sys )
{
p_sys->i_spu_size = 0;
p_sys->state = SUBTITLE_BLOCK_EMPTY;
p_sys->i_spu = 0;
p_sys->p_block = NULL;
}
/*****************************************************************************
* DecoderOpen
*****************************************************************************
* Tries to launch a decoder and return score so that the interface is able
* to chose.
*****************************************************************************/
static int
DecoderOpen( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys;
if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'o','g','t',' ' ) )
{
return VLC_EGENERIC;
}
p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
p_sys->i_debug = config_GetInt( p_this, MODULE_STRING "-debug" );
p_sys->b_packetizer = VLC_FALSE;
p_sys->p_vout = NULL;
p_sys->i_image = -1;
InitSubtitleBlock( p_sys );
es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 'o','g','t',' ' ) );
p_dec->pf_decode_sub = Decode;
p_dec->pf_packetize = Packetize;
dbg_print( (DECODE_DBG_CALL|DECODE_DBG_EXT) , "");
return VLC_SUCCESS;
}
/*****************************************************************************
* PacketizerOpen
*****************************************************************************
* Tries to launch a decoder and return score so that the interface is able
* to chose.
*****************************************************************************/
static int PacketizerOpen( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
if( DecoderOpen( p_this ) )
{
return VLC_EGENERIC;
}
p_dec->p_sys->b_packetizer = VLC_TRUE;
return VLC_SUCCESS;
}
/*****************************************************************************
* Close:
*****************************************************************************/
static void Close( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys = p_dec->p_sys;
dbg_print( (DECODE_DBG_CALL|DECODE_DBG_EXT) , "");
if( !p_sys->b_packetizer )
{
/* FIXME check if it's ok to not lock vout */
if( p_sys->p_vout != NULL && p_sys->p_vout->p_subpicture != NULL )
{
subpicture_t * p_subpic;
int i_subpic;
for( i_subpic = 0; i_subpic < VOUT_MAX_SUBPICTURES; i_subpic++ )
{
p_subpic = &p_sys->p_vout->p_subpicture[i_subpic];
if( p_subpic != NULL &&
( ( p_subpic->i_status == RESERVED_SUBPICTURE ) ||
( p_subpic->i_status == READY_SUBPICTURE ) ) )
{
vout_DestroySubPicture( p_sys->p_vout, p_subpic );
}
}
}
}
if( p_sys->p_block )
{
block_ChainRelease( p_sys->p_block );
}
free( p_sys );
}
/*****************************************************************************
* Decode:
*****************************************************************************/
static void
Decode ( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_spu = Reassemble( p_dec, pp_block );
dbg_print( (DECODE_DBG_CALL) , "");
if( p_spu )
{
p_sys->i_spu = block_ChainExtract( p_spu, p_sys->buffer, 65536 );
p_sys->i_pts = p_spu->i_pts;
block_ChainRelease( p_spu );
if( ( p_sys->p_vout = FindVout( p_dec ) ) )
{
/* Parse and decode */
E_(ParsePacket)( p_dec );
vlc_object_release( p_sys->p_vout );
}
InitSubtitleBlock ( p_sys );
}
}
/*****************************************************************************
* Packetize:
*****************************************************************************/
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_spu = Reassemble( p_dec, pp_block );
if( p_spu )
{
p_spu->i_dts = p_spu->i_pts;
p_spu->i_length = 0;
InitSubtitleBlock( p_sys );
return block_ChainGather( p_spu );
}
return NULL;
}
#define SPU_HEADER_LEN 5
/*****************************************************************************
Reassemble:
The data for single screen subtitle may come in one of many
non-contiguous packets of a stream. This routine is called when the
next packet in the stream comes in. The job of this routine is to
parse the header if this is the beginning) and combine the packets into one
complete subtitle unit.
If everything is complete, we will return a block. Otherwise return
NULL.
The following information is mostly extracted from the SubMux package of
unknown author with additional experimentation.
The format is roughly as follows (everything is big-endian):
byte subtitle channel 0-3
byte subtitle packet number in this subtitle image 0-N,
last is XOR'ed 0x80
u_int16 subtitle image number
u_int16 length in bytes of the rest
byte option flags, unknown meaning except bit 3 (0x08) indicates
presence of the duration field
byte unknown meaning
u_int32 duration in 1/90000ths of a second (optional), start time
is as indicated by the PTS in the PES header
u_int32 xpos
u_int32 ypos
u_int32 width (must be even)
u_int32 height (must be even)
byte[16] palette, 4 palette entries, each contains values for
Y, U, V and transparency, 0 standing for transparent
byte command,
cmd>>6==1 indicates shift
(cmd>>4)&3 is direction from, (0=top,1=left,2=right,3=bottom)
u_int32 shift duration in 1/90000ths of a second
u_int16 offset of odd field (subtitle image is presented interlaced)
byte[] image
The image is encoded using two bits per pixel that select a palette
entry except that value 00 starts a limited rle. When 00 is seen,
the next two bits (00-11) encode the number of pixels (1-4, add one to
the indicated value) to fill with the color in palette entry 0).
The encoding of each line is padded to a whole number of bytes. The
first field is padded to an even byte lenght and the complete subtitle
is padded to a 4-byte multiple that always include one zero byte at
the end.
*****************************************************************************/
static block_t *
Reassemble( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_block;
uint8_t *p_buffer;
u_int16_t i_expected_image;
u_int8_t i_packet, i_expected_packet;
if( pp_block == NULL || *pp_block == NULL )
{
return NULL;
}
p_block = *pp_block;
*pp_block = NULL;
if( p_block->i_buffer < SPU_HEADER_LEN )
{
msg_Dbg( p_dec, "invalid packet header (size %d < %d)" ,
p_block->i_buffer, SPU_HEADER_LEN );
block_Release( p_block );
return NULL;
}
p_buffer = p_block->p_buffer;
dbg_print( (DECODE_DBG_CALL|DECODE_DBG_PACKET),
"header: 0x%02x 0x%02x 0x%02x 0x%02x\n",
p_buffer[1], p_buffer[2], p_buffer[3], p_buffer[4] );
if ( p_sys->state == SUBTITLE_BLOCK_EMPTY ) {
i_expected_image = p_sys->i_image+1;
i_expected_packet = 0;
} else {
i_expected_image = p_sys->i_image;
i_expected_packet = p_sys->i_packet+1;
}
p_buffer += 2;
if ( *p_buffer & 0x80 ) {
p_sys->state = SUBTITLE_BLOCK_COMPLETE;
i_packet = ( *p_buffer++ & 0x7F );
} else {
p_sys->state = SUBTITLE_BLOCK_PARTIAL;
i_packet = *p_buffer++;
}
p_sys->i_image = GETINT16(p_buffer);
if ( p_sys->i_image != i_expected_image ) {
msg_Warn( p_dec, "expecting subtitle image %u but found %u\n",
i_expected_image, p_sys->i_image );
}
if ( i_packet != i_expected_packet ) {
msg_Warn( p_dec, "expecting subtitle image packet %u but found %u",
i_expected_packet, i_packet);
}
p_sys->i_packet = i_packet;
if ( p_sys->i_packet == 0 ) {
/* First packet in the subtitle block */
/* FIXME: Put all of this into a subroutine. */
u_int8_t *p = p_buffer;
p = p_buffer;
int i;
p_sys->i_pts = p_block->i_pts;
p_sys->i_spu_size = GETINT16(p);
p_sys->i_options = *p++;
p_sys->i_options2 = *p++;
if ( p_sys->i_options & 0x08 ) {
p_sys->duration = GETINT32(p);
} else {
p_sys->duration = 0;
}
p_sys->i_x_start= GETINT16(p);
p_sys->i_y_start= GETINT16(p);
p_sys->i_width = GETINT16(p);
p_sys->i_height = GETINT16(p);
for (i=0; i<4; i++) {
p_sys->pi_palette[i].y = *p++;
p_sys->pi_palette[i].u = *p++;
p_sys->pi_palette[i].v = *p++;
/* We have just 4-bit resolution for alpha, but the value for SVCD
* has 8 bits so we scale down the values to the acceptable range */
p_sys->pi_palette[i].t = (*p++) >> 4;
}
p_sys->i_cmd = *p++;
/* We do not really know this, FIXME */
if ( p_sys->i_cmd ) {
p_sys->i_cmd_arg = GETINT32(p);
}
/* Image starts just after skipping next short */
p_sys->comp_image_offset = p + 2 - p_buffer;
/* There begins the first field, so no correction needed */
p_sys->first_field_offset = 0;
/* Actually, this is measured against a different origin, so we have to
adjust it */
p_sys->second_field_offset = GETINT16(p);
p_sys->comp_image_offset = p - p_buffer;
p_sys->comp_image_length =
p_sys->subtitle_data_length - p_sys->comp_image_offset;
p_sys->metadata_length = p_sys->comp_image_offset;
/*spuogt_init_subtitle_data(p_sys);*/
p_sys->subtitle_data_pos = 0;
dbg_print( (DECODE_DBG_PACKET),
"x-start: %d, y-start: %d, width: %d, height %d, "
"spu size: %d",
p_sys->i_x_start, p_sys->i_y_start,
p_sys->i_width, p_sys->i_height,
p_sys->i_spu_size );
}
block_ChainAppend( &p_sys->p_block, p_block );
p_sys->i_spu += p_block->i_buffer - SPU_HEADER_LEN;
if (p_sys->state == SUBTITLE_BLOCK_COMPLETE)
{
if( p_sys->i_spu != p_sys->i_spu_size )
{
msg_Warn( p_dec, "SPU packets size=%d should be %d",
p_sys->i_spu, p_sys->i_spu_size );
}
dbg_print( (DECODE_DBG_PACKET),
"subtitle packet complete, size=%d", p_sys->i_spu );
return p_sys->p_block;
}
return NULL;
}
/* following functions are local */
/*****************************************************************************
* FindVout: Find a vout or wait for one to be created.
*****************************************************************************/
static vout_thread_t *FindVout( decoder_t *p_dec )
{
vout_thread_t *p_vout = NULL;
/* Find an available video output */
do
{
if( p_dec->b_die || p_dec->b_error )
{
break;
}
p_vout = vlc_object_find( p_dec, VLC_OBJECT_VOUT, FIND_ANYWHERE );
if( p_vout )
{
break;
}
msleep( VOUT_OUTMEM_SLEEP );
}
while( 1 );
return p_vout;
}

144
modules/codec/ogt/ogt.h
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/*****************************************************************************
* ogt.h : Overlay Graphics Text (SVCD subtitles) decoder thread interface
*****************************************************************************
* Copyright (C) 2003 VideoLAN
* $Id: ogt.h,v 1.1 2003/12/07 22:14:26 rocky Exp $
*
* Authors: Rocky Bernstein
* based on code from:
* Julio Sanchez Fernandez (http://subhandler.sourceforge.net)
* Samuel Hocevar <sam@zoy.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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
#define DECODE_DBG_EXT 1 /* Calls from external routines */
#define DECODE_DBG_CALL 2 /* all calls */
#define DECODE_DBG_PACKET 4 /* packet assembly info */
#define DECODE_DBG_INFO 8
#define DECODE_DEBUG 1
#if DECODE_DEBUG
#define dbg_print(mask, s, args...) \
if (p_sys && p_sys->i_debug & mask) \
msg_Dbg(p_dec, "%s: "s, __func__ , ##args)
#else
#define dbg_print(mask, s, args...)
#endif
#define LOG_ERR(args...) msg_Err( p_input, args )
#define LOG_WARN(args...) msg_Warn( p_input, args )
#define GETINT16(p) ( (p[0] << 8) + p[1] ); p +=2;
#define GETINT32(p) ( (p[0] << 24) + (p[1] << 16) + \
(p[2] << 8) + (p[3]) ) ; p += 4;
typedef enum {
SUBTITLE_BLOCK_EMPTY,
SUBTITLE_BLOCK_PARTIAL,
SUBTITLE_BLOCK_COMPLETE
} packet_state_t;
/* Color and transparency of a pixel or a palette (CLUT) entry */
typedef struct ogt_yuvt_val_s {
u_int8_t y;
u_int8_t u;
u_int8_t v;
u_int8_t t;
} ogt_yuvt_val_t;
struct decoder_sys_t
{
#ifndef FIXED
int i_rle_size; /*REMOVE WHEN WE'VE GONE OVER ALL CODE*/
#endif
int i_debug; /* debugging mask */
int b_packetizer;
mtime_t i_pts; /* Start PTS of subtitle block */
int i_spu_size; /* size of the allocated subtitle_data */
int i_spu;
packet_state_t state; /* data-gathering state for this subtitle */
u_int16_t i_image; /* image number in the subtitle stream; 0 is the
first one. */
u_int8_t i_packet; /* packet number for above image number; 0 is the
first one. */
block_t *p_block; /* Bytes of the packet. */
uint8_t buffer[65536 + 20 ]; /* we will never overflow more than 11 bytes if I'm right */
vout_thread_t *p_vout;
/* Move into subpicture_sys_t? */
u_int16_t comp_image_offset; /* offset from subtitle_data to compressed
image data */
int comp_image_length; /* size of the compressed image data */
int first_field_offset;
int second_field_offset;
int metadata_offset; /* offset to data describing the image */
int metadata_length; /* length of metadata */
int subtitle_data_pos; /* where to write next chunk */
int subtitle_data_length; /* goal for subtitle_data_pos while gathering,
length of used subtitle_data later */
u_int32_t duration; /* how long to display the image, 0 stands
for "until next sub" */
u_int16_t i_x_start, i_y_start; /* position of top leftmost pixel of
image when displayed */
u_int16_t i_width, i_height; /* dimensions in pixels of image */
ogt_yuvt_val_t pi_palette[4];
ogt_yuvt_val_t pi_palette_highlight[4];
u_int8_t i_options;
u_int8_t i_options2;
u_int8_t i_cmd;
u_int32_t i_cmd_arg;
};
struct subpicture_sys_t
{
mtime_t i_pts; /* presentation timestamp */
int pi_offset[2]; /* byte offsets to data */
void *p_data;
/* Color information */
vlc_bool_t b_palette;
uint8_t pi_alpha[4];
uint8_t pi_yuv[4][3];
/* Link to our input */
vlc_object_t * p_input;
/* Cropping properties */
vlc_mutex_t lock;
vlc_bool_t b_crop;
unsigned int i_x_start, i_y_start, i_x_end, i_y_end;
};
/*****************************************************************************
* Prototypes
*****************************************************************************/
void E_(ParsePacket)( decoder_t * );
void E_(RenderSPU) ( vout_thread_t *, picture_t *, const subpicture_t * );
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