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vlc/modules/codec/theora.c

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/*****************************************************************************
* theora.c: theora decoder module making use of libtheora.
*****************************************************************************
* Copyright (C) 1999-2001 the VideoLAN team
* $Id$
*
* Authors: Gildas Bazin <gbazin@videolan.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_codec.h>
#include <vlc_vout.h>
#include <vlc_sout.h>
#include <vlc_input.h>
#include <ogg/ogg.h>
#include <theora/theora.h>
/*****************************************************************************
* decoder_sys_t : theora decoder descriptor
*****************************************************************************/
struct decoder_sys_t
{
/* Module mode */
bool b_packetizer;
/*
* Input properties
*/
int i_headers;
/*
* Theora properties
*/
theora_info ti; /* theora bitstream settings */
theora_comment tc; /* theora comment header */
theora_state td; /* theora bitstream user comments */
/*
* Decoding properties
*/
bool b_decoded_first_keyframe;
/*
* Common properties
*/
mtime_t i_pts;
};
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int OpenDecoder ( vlc_object_t * );
static int OpenPacketizer( vlc_object_t * );
static void CloseDecoder ( vlc_object_t * );
static void *DecodeBlock ( decoder_t *, block_t ** );
static int ProcessHeaders( decoder_t * );
static void *ProcessPacket ( decoder_t *, ogg_packet *, block_t ** );
static picture_t *DecodePacket( decoder_t *, ogg_packet * );
static void ParseTheoraComments( decoder_t * );
static void theora_CopyPicture( decoder_t *, picture_t *, yuv_buffer * );
static int OpenEncoder( vlc_object_t *p_this );
static void CloseEncoder( vlc_object_t *p_this );
static block_t *Encode( encoder_t *p_enc, picture_t *p_pict );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
#define ENC_QUALITY_TEXT N_("Encoding quality")
#define ENC_QUALITY_LONGTEXT N_( \
"Enforce a quality between 1 (low) and 10 (high), instead " \
"of specifying a particular bitrate. This will produce a VBR stream." )
vlc_module_begin();
set_category( CAT_INPUT );
set_subcategory( SUBCAT_INPUT_VCODEC );
set_shortname( "Theora" );
set_description( N_("Theora video decoder") );
set_capability( "decoder", 100 );
set_callbacks( OpenDecoder, CloseDecoder );
add_shortcut( "theora" );
add_submodule();
set_description( N_("Theora video packetizer") );
set_capability( "packetizer", 100 );
set_callbacks( OpenPacketizer, CloseDecoder );
add_submodule();
set_description( N_("Theora video encoder") );
set_capability( "encoder", 150 );
set_callbacks( OpenEncoder, CloseEncoder );
# define ENC_CFG_PREFIX "sout-theora-"
add_integer( ENC_CFG_PREFIX "quality", 2, NULL, ENC_QUALITY_TEXT,
ENC_QUALITY_LONGTEXT, false );
vlc_module_end();
static const char *const ppsz_enc_options[] = {
"quality", NULL
};
/*****************************************************************************
* OpenDecoder: probe the decoder and return score
*****************************************************************************/
static int OpenDecoder( 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('t','h','e','o') )
{
return VLC_EGENERIC;
}
/* Allocate the memory needed to store the decoder's structure */
if( ( p_dec->p_sys = p_sys =
(decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
return VLC_ENOMEM;
p_dec->p_sys->b_packetizer = false;
p_sys->i_pts = 0;
p_sys->b_decoded_first_keyframe = false;
/* Set output properties */
p_dec->fmt_out.i_cat = VIDEO_ES;
p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','0');
/* Set callbacks */
p_dec->pf_decode_video = (picture_t *(*)(decoder_t *, block_t **))
DecodeBlock;
p_dec->pf_packetize = (block_t *(*)(decoder_t *, block_t **))
DecodeBlock;
/* Init supporting Theora structures needed in header parsing */
theora_comment_init( &p_sys->tc );
theora_info_init( &p_sys->ti );
p_sys->i_headers = 0;
return VLC_SUCCESS;
}
static int OpenPacketizer( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
int i_ret = OpenDecoder( p_this );
if( i_ret == VLC_SUCCESS )
{
p_dec->p_sys->b_packetizer = true;
p_dec->fmt_out.i_codec = VLC_FOURCC( 't', 'h', 'e', 'o' );
}
return i_ret;
}
/****************************************************************************
* DecodeBlock: the whole thing
****************************************************************************
* This function must be fed with ogg packets.
****************************************************************************/
static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_block;
ogg_packet oggpacket;
if( !pp_block || !*pp_block ) return NULL;
p_block = *pp_block;
/* Block to Ogg packet */
oggpacket.packet = p_block->p_buffer;
oggpacket.bytes = p_block->i_buffer;
oggpacket.granulepos = p_block->i_dts;
oggpacket.b_o_s = 0;
oggpacket.e_o_s = 0;
oggpacket.packetno = 0;
/* Check for headers */
if( p_sys->i_headers == 0 && p_dec->fmt_in.i_extra )
{
/* Headers already available as extra data */
p_sys->i_headers = 3;
}
else if( oggpacket.bytes && p_sys->i_headers < 3 )
{
/* Backup headers as extra data */
uint8_t *p_extra;
p_dec->fmt_in.p_extra =
realloc( p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra +
oggpacket.bytes + 2 );
p_extra = ((uint8_t *)p_dec->fmt_in.p_extra) + p_dec->fmt_in.i_extra;
*(p_extra++) = oggpacket.bytes >> 8;
*(p_extra++) = oggpacket.bytes & 0xFF;
memcpy( p_extra, oggpacket.packet, oggpacket.bytes );
p_dec->fmt_in.i_extra += oggpacket.bytes + 2;
block_Release( *pp_block );
p_sys->i_headers++;
return NULL;
}
if( p_sys->i_headers == 3 )
{
if( ProcessHeaders( p_dec ) != VLC_SUCCESS )
{
p_sys->i_headers = 0;
p_dec->fmt_in.i_extra = 0;
block_Release( *pp_block );
return NULL;
}
else p_sys->i_headers++;
}
return ProcessPacket( p_dec, &oggpacket, pp_block );
}
/*****************************************************************************
* ProcessHeaders: process Theora headers.
*****************************************************************************/
static int ProcessHeaders( decoder_t *p_dec )
{
decoder_sys_t *p_sys = p_dec->p_sys;
ogg_packet oggpacket;
uint8_t *p_extra;
int i_extra;
if( !p_dec->fmt_in.i_extra ) return VLC_EGENERIC;
oggpacket.granulepos = -1;
oggpacket.b_o_s = 1; /* yes this actually is a b_o_s packet :) */
oggpacket.e_o_s = 0;
oggpacket.packetno = 0;
p_extra = p_dec->fmt_in.p_extra;
i_extra = p_dec->fmt_in.i_extra;
/* Take care of the initial Vorbis header */
oggpacket.bytes = *(p_extra++) << 8;
oggpacket.bytes |= (*(p_extra++) & 0xFF);
oggpacket.packet = p_extra;
p_extra += oggpacket.bytes;
i_extra -= (oggpacket.bytes + 2);
if( i_extra < 0 )
{
msg_Err( p_dec, "header data corrupted");
return VLC_EGENERIC;
}
if( theora_decode_header( &p_sys->ti, &p_sys->tc, &oggpacket ) < 0 )
{
msg_Err( p_dec, "this bitstream does not contain Theora video data" );
return VLC_EGENERIC;
}
/* Set output properties */
switch( p_sys->ti.pixelformat )
{
case OC_PF_420:
p_dec->fmt_out.i_codec = VLC_FOURCC( 'I','4','2','0' );
break;
case OC_PF_422:
p_dec->fmt_out.i_codec = VLC_FOURCC( 'I','4','2','2' );
break;
case OC_PF_444:
p_dec->fmt_out.i_codec = VLC_FOURCC( 'I','4','4','4' );
break;
case OC_PF_RSVD:
default:
msg_Err( p_dec, "unknown chroma in theora sample" );
break;
}
p_dec->fmt_out.video.i_width = p_sys->ti.width;
p_dec->fmt_out.video.i_height = p_sys->ti.height;
if( p_sys->ti.frame_width && p_sys->ti.frame_height )
{
p_dec->fmt_out.video.i_visible_width = p_sys->ti.frame_width;
p_dec->fmt_out.video.i_visible_height = p_sys->ti.frame_height;
if( p_sys->ti.offset_x || p_sys->ti.offset_y )
{
p_dec->fmt_out.video.i_x_offset = p_sys->ti.offset_x;
p_dec->fmt_out.video.i_y_offset = p_sys->ti.offset_y;
}
}
if( p_sys->ti.aspect_denominator && p_sys->ti.aspect_numerator )
{
p_dec->fmt_out.video.i_aspect = ((int64_t)VOUT_ASPECT_FACTOR) *
( p_sys->ti.aspect_numerator * p_dec->fmt_out.video.i_width ) /
( p_sys->ti.aspect_denominator * p_dec->fmt_out.video.i_height );
}
else
{
p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR *
p_sys->ti.frame_width / p_sys->ti.frame_height;
}
if( p_sys->ti.fps_numerator > 0 && p_sys->ti.fps_denominator > 0 )
{
p_dec->fmt_out.video.i_frame_rate = p_sys->ti.fps_numerator;
p_dec->fmt_out.video.i_frame_rate_base = p_sys->ti.fps_denominator;
}
msg_Dbg( p_dec, "%dx%d %.02f fps video, frame content "
"is %dx%d with offset (%d,%d)",
p_sys->ti.width, p_sys->ti.height,
(double)p_sys->ti.fps_numerator/p_sys->ti.fps_denominator,
p_sys->ti.frame_width, p_sys->ti.frame_height,
p_sys->ti.offset_x, p_sys->ti.offset_y );
/* Sanity check that seems necessary for some corrupted files */
if( p_sys->ti.width < p_sys->ti.frame_width ||
p_sys->ti.height < p_sys->ti.frame_height )
{
msg_Warn( p_dec, "trying to correct invalid theora header "
"(frame size (%dx%d) is smaller than frame content (%d,%d))",
p_sys->ti.width, p_sys->ti.height,
p_sys->ti.frame_width, p_sys->ti.frame_height );
if( p_sys->ti.width < p_sys->ti.frame_width )
p_sys->ti.width = p_sys->ti.frame_width;
if( p_sys->ti.height < p_sys->ti.frame_height )
p_sys->ti.height = p_sys->ti.frame_height;
}
/* The next packet in order is the comments header */
oggpacket.b_o_s = 0;
oggpacket.bytes = *(p_extra++) << 8;
oggpacket.bytes |= (*(p_extra++) & 0xFF);
oggpacket.packet = p_extra;
p_extra += oggpacket.bytes;
i_extra -= (oggpacket.bytes + 2);
if( i_extra < 0 )
{
msg_Err( p_dec, "header data corrupted");
return VLC_EGENERIC;
}
/* The next packet in order is the comments header */
if( theora_decode_header( &p_sys->ti, &p_sys->tc, &oggpacket ) < 0 )
{
msg_Err( p_dec, "2nd Theora header is corrupted" );
return VLC_EGENERIC;
}
ParseTheoraComments( p_dec );
/* The next packet in order is the codebooks header
* We need to watch out that this packet is not missing as a
* missing or corrupted header is fatal. */
oggpacket.bytes = *(p_extra++) << 8;
oggpacket.bytes |= (*(p_extra++) & 0xFF);
oggpacket.packet = p_extra;
i_extra -= (oggpacket.bytes + 2);
if( i_extra < 0 )
{
msg_Err( p_dec, "header data corrupted");
return VLC_EGENERIC;
}
/* The next packet in order is the codebooks header
* We need to watch out that this packet is not missing as a
* missing or corrupted header is fatal */
if( theora_decode_header( &p_sys->ti, &p_sys->tc, &oggpacket ) < 0 )
{
msg_Err( p_dec, "3rd Theora header is corrupted" );
return VLC_EGENERIC;
}
if( !p_sys->b_packetizer )
{
/* We have all the headers, initialize decoder */
theora_decode_init( &p_sys->td, &p_sys->ti );
}
else
{
p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
p_dec->fmt_out.p_extra =
realloc( p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
memcpy( p_dec->fmt_out.p_extra,
p_dec->fmt_in.p_extra, p_dec->fmt_out.i_extra );
}
return VLC_SUCCESS;
}
/*****************************************************************************
* ProcessPacket: processes a theora packet.
*****************************************************************************/
static void *ProcessPacket( decoder_t *p_dec, ogg_packet *p_oggpacket,
block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_block = *pp_block;
void *p_buf;
if( ( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) ) != 0 )
{
/* Don't send the the first packet after a discontinuity to
* theora_decode, otherwise we get purple/green display artifacts
* appearing in the video output */
return NULL;
}
/* Date management */
if( p_block->i_pts > 0 && p_block->i_pts != p_sys->i_pts )
{
p_sys->i_pts = p_block->i_pts;
}
*pp_block = NULL; /* To avoid being fed the same packet again */
if( p_sys->b_packetizer )
{
/* Date management */
p_block->i_dts = p_block->i_pts = p_sys->i_pts;
if( p_sys->i_headers >= 3 )
p_block->i_length = p_sys->i_pts - p_block->i_pts;
else
p_block->i_length = 0;
p_buf = p_block;
}
else
{
if( p_sys->i_headers >= 3 )
p_buf = DecodePacket( p_dec, p_oggpacket );
else
p_buf = NULL;
if( p_block ) block_Release( p_block );
}
/* Date management */
p_sys->i_pts += ( INT64_C(1000000) * p_sys->ti.fps_denominator /
p_sys->ti.fps_numerator ); /* 1 frame per packet */
return p_buf;
}
/*****************************************************************************
* DecodePacket: decodes a Theora packet.
*****************************************************************************/
static picture_t *DecodePacket( decoder_t *p_dec, ogg_packet *p_oggpacket )
{
decoder_sys_t *p_sys = p_dec->p_sys;
picture_t *p_pic;
yuv_buffer yuv;
theora_decode_packetin( &p_sys->td, p_oggpacket );
/* Check for keyframe */
if( !(p_oggpacket->packet[0] & 0x80) /* data packet */ &&
!(p_oggpacket->packet[0] & 0x40) /* intra frame */ )
p_sys->b_decoded_first_keyframe = true;
/* If we haven't seen a single keyframe yet, don't let Theora decode
* anything, otherwise we'll get display artifacts. (This is impossible
* in the general case, but can happen if e.g. we play a network stream
* using a timed URL, such that the server doesn't start the video with a
* keyframe). */
if( p_sys->b_decoded_first_keyframe )
theora_decode_YUVout( &p_sys->td, &yuv );
else
return NULL;
/* Get a new picture */
p_pic = p_dec->pf_vout_buffer_new( p_dec );
if( !p_pic ) return NULL;
theora_CopyPicture( p_dec, p_pic, &yuv );
p_pic->date = p_sys->i_pts;
return p_pic;
}
/*****************************************************************************
* ParseTheoraComments: FIXME should be done in demuxer
*****************************************************************************/
static void ParseTheoraComments( decoder_t *p_dec )
{
input_thread_t *p_input = (input_thread_t *)p_dec->p_parent;
char *psz_name, *psz_value, *psz_comment;
int i = 0;
if( p_input->i_object_type != VLC_OBJECT_INPUT ) return;
while ( i < p_dec->p_sys->tc.comments )
{
psz_comment = strdup( p_dec->p_sys->tc.user_comments[i] );
if( !psz_comment )
{
msg_Warn( p_dec, "out of memory" );
break;
}
psz_name = psz_comment;
psz_value = strchr( psz_comment, '=' );
if( psz_value )
{
*psz_value = '\0';
psz_value++;
input_Control( p_input, INPUT_ADD_INFO, _("Theora comment"),
psz_name, "%s", psz_value );
}
free( psz_comment );
i++;
}
}
/*****************************************************************************
* CloseDecoder: theora decoder destruction
*****************************************************************************/
static void CloseDecoder( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t *)p_this;
decoder_sys_t *p_sys = p_dec->p_sys;
theora_info_clear( &p_sys->ti );
theora_comment_clear( &p_sys->tc );
free( p_sys );
}
/*****************************************************************************
* theora_CopyPicture: copy a picture from theora internal buffers to a
* picture_t structure.
*****************************************************************************/
static void theora_CopyPicture( decoder_t *p_dec, picture_t *p_pic,
yuv_buffer *yuv )
{
int i_plane, i_line, i_dst_stride, i_src_stride;
uint8_t *p_dst, *p_src;
for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
{
p_dst = p_pic->p[i_plane].p_pixels;
p_src = i_plane ? (i_plane - 1 ? yuv->v : yuv->u ) : yuv->y;
i_dst_stride = p_pic->p[i_plane].i_pitch;
i_src_stride = i_plane ? yuv->uv_stride : yuv->y_stride;
for( i_line = 0; i_line < p_pic->p[i_plane].i_lines; i_line++ )
{
vlc_memcpy( p_dst, p_src,
i_plane ? yuv->uv_width : yuv->y_width );
p_src += i_src_stride;
p_dst += i_dst_stride;
}
}
}
/*****************************************************************************
* encoder_sys_t : theora encoder descriptor
*****************************************************************************/
struct encoder_sys_t
{
/*
* Input properties
*/
bool b_headers;
/*
* Theora properties
*/
theora_info ti; /* theora bitstream settings */
theora_comment tc; /* theora comment header */
theora_state td; /* theora bitstream user comments */
int i_width, i_height;
};
/*****************************************************************************
* OpenEncoder: probe the encoder and return score
*****************************************************************************/
static int OpenEncoder( vlc_object_t *p_this )
{
encoder_t *p_enc = (encoder_t *)p_this;
encoder_sys_t *p_sys = p_enc->p_sys;
ogg_packet header;
uint8_t *p_extra;
vlc_value_t val;
int i_quality, i;
if( p_enc->fmt_out.i_codec != VLC_FOURCC('t','h','e','o') &&
!p_enc->b_force )
{
return VLC_EGENERIC;
}
/* Allocate the memory needed to store the decoder's structure */
if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
return VLC_ENOMEM;
p_enc->p_sys = p_sys;
p_enc->pf_encode_video = Encode;
p_enc->fmt_in.i_codec = VLC_FOURCC('I','4','2','0');
p_enc->fmt_out.i_codec = VLC_FOURCC('t','h','e','o');
config_ChainParse( p_enc, ENC_CFG_PREFIX, ppsz_enc_options, p_enc->p_cfg );
var_Get( p_enc, ENC_CFG_PREFIX "quality", &val );
i_quality = val.i_int;
if( i_quality > 10 ) i_quality = 10;
if( i_quality < 0 ) i_quality = 0;
theora_info_init( &p_sys->ti );
p_sys->ti.width = p_enc->fmt_in.video.i_width;
p_sys->ti.height = p_enc->fmt_in.video.i_height;
if( p_sys->ti.width % 16 || p_sys->ti.height % 16 )
{
/* Pictures from the transcoder should always have a pitch
* which is a multiple of 16 */
p_sys->ti.width = (p_sys->ti.width + 15) >> 4 << 4;
p_sys->ti.height = (p_sys->ti.height + 15) >> 4 << 4;
msg_Dbg( p_enc, "padding video from %dx%d to %dx%d",
p_enc->fmt_in.video.i_width, p_enc->fmt_in.video.i_height,
p_sys->ti.width, p_sys->ti.height );
}
p_sys->ti.frame_width = p_enc->fmt_in.video.i_width;
p_sys->ti.frame_height = p_enc->fmt_in.video.i_height;
p_sys->ti.offset_x = 0 /*frame_x_offset*/;
p_sys->ti.offset_y = 0 /*frame_y_offset*/;
p_sys->i_width = p_sys->ti.width;
p_sys->i_height = p_sys->ti.height;
if( !p_enc->fmt_in.video.i_frame_rate ||
!p_enc->fmt_in.video.i_frame_rate_base )
{
p_sys->ti.fps_numerator = 25;
p_sys->ti.fps_denominator = 1;
}
else
{
p_sys->ti.fps_numerator = p_enc->fmt_in.video.i_frame_rate;
p_sys->ti.fps_denominator = p_enc->fmt_in.video.i_frame_rate_base;
}
if( p_enc->fmt_in.video.i_aspect )
{
uint64_t i_num, i_den;
unsigned i_dst_num, i_dst_den;
i_num = p_enc->fmt_in.video.i_aspect * (int64_t)p_sys->ti.height;
i_den = VOUT_ASPECT_FACTOR * p_sys->ti.width;
vlc_ureduce( &i_dst_num, &i_dst_den, i_num, i_den, 0 );
p_sys->ti.aspect_numerator = i_dst_num;
p_sys->ti.aspect_denominator = i_dst_den;
}
else
{
p_sys->ti.aspect_numerator = 4;
p_sys->ti.aspect_denominator = 3;
}
p_sys->ti.target_bitrate = p_enc->fmt_out.i_bitrate;
p_sys->ti.quality = ((float)i_quality) * 6.3;
p_sys->ti.dropframes_p = 0;
p_sys->ti.quick_p = 1;
p_sys->ti.keyframe_auto_p = 1;
p_sys->ti.keyframe_frequency = 64;
p_sys->ti.keyframe_frequency_force = 64;
p_sys->ti.keyframe_data_target_bitrate = p_enc->fmt_out.i_bitrate * 1.5;
p_sys->ti.keyframe_auto_threshold = 80;
p_sys->ti.keyframe_mindistance = 8;
p_sys->ti.noise_sensitivity = 1;
theora_encode_init( &p_sys->td, &p_sys->ti );
theora_info_clear( &p_sys->ti );
theora_comment_init( &p_sys->tc );
/* Create and store headers */
p_enc->fmt_out.i_extra = 3 * 2;
for( i = 0; i < 3; i++ )
{
if( i == 0 ) theora_encode_header( &p_sys->td, &header );
else if( i == 1 ) theora_encode_comment( &p_sys->tc, &header );
else if( i == 2 ) theora_encode_tables( &p_sys->td, &header );
p_enc->fmt_out.p_extra =
realloc( p_enc->fmt_out.p_extra,
p_enc->fmt_out.i_extra + header.bytes );
p_extra = p_enc->fmt_out.p_extra;
p_extra += p_enc->fmt_out.i_extra + (i-3)*2;
p_enc->fmt_out.i_extra += header.bytes;
*(p_extra++) = header.bytes >> 8;
*(p_extra++) = header.bytes & 0xFF;
memcpy( p_extra, header.packet, header.bytes );
}
return VLC_SUCCESS;
}
/****************************************************************************
* Encode: the whole thing
****************************************************************************
* This function spits out ogg packets.
****************************************************************************/
static block_t *Encode( encoder_t *p_enc, picture_t *p_pict )
{
encoder_sys_t *p_sys = p_enc->p_sys;
ogg_packet oggpacket;
block_t *p_block;
yuv_buffer yuv;
int i;
/* Sanity check */
if( p_pict->p[0].i_pitch < (int)p_sys->i_width ||
p_pict->p[0].i_lines < (int)p_sys->i_height )
{
msg_Warn( p_enc, "frame is smaller than encoding size"
"(%ix%i->%ix%i) -> dropping frame",
p_pict->p[0].i_pitch, p_pict->p[0].i_lines,
p_sys->i_width, p_sys->i_height );
return NULL;
}
/* Fill padding */
if( p_pict->p[0].i_visible_pitch < (int)p_sys->i_width )
{
for( i = 0; i < p_sys->i_height; i++ )
{
memset( p_pict->p[0].p_pixels + i * p_pict->p[0].i_pitch +
p_pict->p[0].i_visible_pitch,
*( p_pict->p[0].p_pixels + i * p_pict->p[0].i_pitch +
p_pict->p[0].i_visible_pitch - 1 ),
p_sys->i_width - p_pict->p[0].i_visible_pitch );
}
for( i = 0; i < p_sys->i_height / 2; i++ )
{
memset( p_pict->p[1].p_pixels + i * p_pict->p[1].i_pitch +
p_pict->p[1].i_visible_pitch,
*( p_pict->p[1].p_pixels + i * p_pict->p[1].i_pitch +
p_pict->p[1].i_visible_pitch - 1 ),
p_sys->i_width / 2 - p_pict->p[1].i_visible_pitch );
memset( p_pict->p[2].p_pixels + i * p_pict->p[2].i_pitch +
p_pict->p[2].i_visible_pitch,
*( p_pict->p[2].p_pixels + i * p_pict->p[2].i_pitch +
p_pict->p[2].i_visible_pitch - 1 ),
p_sys->i_width / 2 - p_pict->p[2].i_visible_pitch );
}
}
if( p_pict->p[0].i_visible_lines < (int)p_sys->i_height )
{
for( i = p_pict->p[0].i_visible_lines; i < p_sys->i_height; i++ )
{
memset( p_pict->p[0].p_pixels + i * p_pict->p[0].i_pitch, 0,
p_sys->i_width );
}
for( i = p_pict->p[1].i_visible_lines; i < p_sys->i_height / 2; i++ )
{
memset( p_pict->p[1].p_pixels + i * p_pict->p[1].i_pitch, 0x80,
p_sys->i_width / 2 );
memset( p_pict->p[2].p_pixels + i * p_pict->p[2].i_pitch, 0x80,
p_sys->i_width / 2 );
}
}
/* Theora is a one-frame-in, one-frame-out system. Submit a frame
* for compression and pull out the packet. */
yuv.y_width = p_sys->i_width;
yuv.y_height = p_sys->i_height;
yuv.y_stride = p_pict->p[0].i_pitch;
yuv.uv_width = p_sys->i_width / 2;
yuv.uv_height = p_sys->i_height / 2;
yuv.uv_stride = p_pict->p[1].i_pitch;
yuv.y = p_pict->p[0].p_pixels;
yuv.u = p_pict->p[1].p_pixels;
yuv.v = p_pict->p[2].p_pixels;
if( theora_encode_YUVin( &p_sys->td, &yuv ) < 0 )
{
msg_Warn( p_enc, "failed encoding a frame" );
return NULL;
}
theora_encode_packetout( &p_sys->td, 0, &oggpacket );
/* Ogg packet to block */
p_block = block_New( p_enc, oggpacket.bytes );
memcpy( p_block->p_buffer, oggpacket.packet, oggpacket.bytes );
p_block->i_dts = p_block->i_pts = p_pict->date;
return p_block;
}
/*****************************************************************************
* CloseEncoder: theora encoder destruction
*****************************************************************************/
static void CloseEncoder( vlc_object_t *p_this )
{
encoder_t *p_enc = (encoder_t *)p_this;
encoder_sys_t *p_sys = p_enc->p_sys;
theora_info_clear( &p_sys->ti );
theora_comment_clear( &p_sys->tc );
free( p_sys );
}