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395 lines
14 KiB
395 lines
14 KiB
/*****************************************************************************
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* schroedinger.c: Dirac decoder module making use of libschroedinger.
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* (http://www.bbc.co.uk/rd/projects/dirac/index.shtml)
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* (http://diracvideo.org)
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*****************************************************************************
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* Copyright (C) 2008 the VideoLAN team
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* $Id$
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*
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* Authors: Jonathan Rosser <jonathan.rosser@gmail.com>
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* David Flynn <davidf at rd dot bbc.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_codec.h>
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#include <vlc_sout.h>
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#include <schroedinger/schro.h>
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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static int OpenDecoder ( vlc_object_t * );
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static void CloseDecoder ( vlc_object_t * );
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vlc_module_begin ()
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set_category( CAT_INPUT )
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set_subcategory( SUBCAT_INPUT_VCODEC )
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set_description( N_("Schroedinger video decoder") )
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set_capability( "decoder", 200 )
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set_callbacks( OpenDecoder, CloseDecoder )
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add_shortcut( "schroedinger" )
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vlc_module_end ()
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static picture_t *DecodeBlock ( decoder_t *p_dec, block_t **pp_block );
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struct picture_free_t
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{
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picture_t *p_pic;
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decoder_t *p_dec;
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};
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/*****************************************************************************
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* decoder_sys_t : Schroedinger decoder descriptor
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*****************************************************************************/
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struct decoder_sys_t
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{
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/*
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* Dirac properties
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*/
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mtime_t i_lastpts;
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mtime_t i_frame_pts_delta;
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SchroDecoder *p_schro;
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SchroVideoFormat *p_format;
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};
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/*****************************************************************************
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* OpenDecoder: probe the decoder and return score
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*****************************************************************************/
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static int OpenDecoder( vlc_object_t *p_this )
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{
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decoder_t *p_dec = (decoder_t*)p_this;
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decoder_sys_t *p_sys;
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SchroDecoder *p_schro;
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if( p_dec->fmt_in.i_codec != VLC_CODEC_DIRAC )
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{
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return VLC_EGENERIC;
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}
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/* Allocate the memory needed to store the decoder's structure */
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p_sys = malloc(sizeof(decoder_sys_t));
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if( p_sys == NULL )
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return VLC_ENOMEM;
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/* Initialise the schroedinger (and hence liboil libraries */
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/* This does no allocation and is safe to call */
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schro_init();
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/* Initialise the schroedinger decoder */
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if( !(p_schro = schro_decoder_new()) )
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{
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free( p_sys );
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return VLC_EGENERIC;
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}
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p_dec->p_sys = p_sys;
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p_sys->p_schro = p_schro;
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p_sys->p_format = NULL;
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p_sys->i_lastpts = VLC_TS_INVALID;
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p_sys->i_frame_pts_delta = 0;
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/* Set output properties */
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p_dec->fmt_out.i_cat = VIDEO_ES;
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p_dec->fmt_out.i_codec = VLC_CODEC_I420;
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/* Set callbacks */
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p_dec->pf_decode_video = DecodeBlock;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* SetPictureFormat: Set the decoded picture params to the ones from the stream
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*****************************************************************************/
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static void SetVideoFormat( decoder_t *p_dec )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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p_sys->p_format = schro_decoder_get_video_format(p_sys->p_schro);
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if( p_sys->p_format == NULL ) return;
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p_sys->i_frame_pts_delta = INT64_C(1000000)
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* p_sys->p_format->frame_rate_denominator
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/ p_sys->p_format->frame_rate_numerator;
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switch( p_sys->p_format->chroma_format )
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{
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case SCHRO_CHROMA_420: p_dec->fmt_out.i_codec = VLC_CODEC_I420; break;
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case SCHRO_CHROMA_422: p_dec->fmt_out.i_codec = VLC_CODEC_I422; break;
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case SCHRO_CHROMA_444: p_dec->fmt_out.i_codec = VLC_CODEC_I444; break;
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default:
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p_dec->fmt_out.i_codec = 0;
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break;
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}
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p_dec->fmt_out.video.i_visible_width = p_sys->p_format->clean_width;
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p_dec->fmt_out.video.i_x_offset = p_sys->p_format->left_offset;
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p_dec->fmt_out.video.i_width = p_sys->p_format->width;
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p_dec->fmt_out.video.i_visible_height = p_sys->p_format->clean_height;
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p_dec->fmt_out.video.i_y_offset = p_sys->p_format->top_offset;
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p_dec->fmt_out.video.i_height = p_sys->p_format->height;
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/* aspect_ratio_[numerator|denominator] describes the pixel aspect ratio */
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p_dec->fmt_out.video.i_sar_num = p_sys->p_format->aspect_ratio_numerator;
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p_dec->fmt_out.video.i_sar_den = p_sys->p_format->aspect_ratio_denominator;
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p_dec->fmt_out.video.i_frame_rate =
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p_sys->p_format->frame_rate_numerator;
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p_dec->fmt_out.video.i_frame_rate_base =
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p_sys->p_format->frame_rate_denominator;
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}
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/*****************************************************************************
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* SchroFrameFree: schro_frame callback to release the associated picture_t
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* When schro_decoder_reset() is called there will be pictures in the
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* decoding pipeline that need to be released rather than displayed.
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*****************************************************************************/
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static void SchroFrameFree( SchroFrame *frame, void *priv)
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{
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struct picture_free_t *p_free = priv;
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if( !p_free )
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return;
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decoder_DeletePicture( p_free->p_dec, p_free->p_pic );
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free(p_free);
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(void)frame;
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}
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/*****************************************************************************
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* CreateSchroFrameFromPic: wrap a picture_t in a SchroFrame
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*****************************************************************************/
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static SchroFrame *CreateSchroFrameFromPic( decoder_t *p_dec )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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SchroFrame *p_schroframe = schro_frame_new();
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picture_t *p_pic = NULL;
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struct picture_free_t *p_free;
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if( !p_schroframe )
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return NULL;
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p_pic = decoder_NewPicture( p_dec );
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if( !p_pic )
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return NULL;
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p_schroframe->format = SCHRO_FRAME_FORMAT_U8_420;
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if( p_sys->p_format->chroma_format == SCHRO_CHROMA_422 )
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{
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p_schroframe->format = SCHRO_FRAME_FORMAT_U8_422;
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}
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else if( p_sys->p_format->chroma_format == SCHRO_CHROMA_444 )
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{
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p_schroframe->format = SCHRO_FRAME_FORMAT_U8_444;
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}
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p_schroframe->width = p_sys->p_format->width;
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p_schroframe->height = p_sys->p_format->height;
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p_free = malloc( sizeof( *p_free ) );
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p_free->p_pic = p_pic;
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p_free->p_dec = p_dec;
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schro_frame_set_free_callback( p_schroframe, SchroFrameFree, p_free );
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for( int i=0; i<3; i++ )
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{
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p_schroframe->components[i].width = p_pic->p[i].i_visible_pitch;
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p_schroframe->components[i].stride = p_pic->p[i].i_pitch;
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p_schroframe->components[i].height = p_pic->p[i].i_visible_lines;
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p_schroframe->components[i].length =
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p_pic->p[i].i_pitch * p_pic->p[i].i_lines;
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p_schroframe->components[i].data = p_pic->p[i].p_pixels;
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if(i!=0)
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{
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p_schroframe->components[i].v_shift =
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SCHRO_FRAME_FORMAT_V_SHIFT( p_schroframe->format );
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p_schroframe->components[i].h_shift =
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SCHRO_FRAME_FORMAT_H_SHIFT( p_schroframe->format );
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}
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}
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p_pic->b_progressive = !p_sys->p_format->interlaced;
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p_pic->b_top_field_first = p_sys->p_format->top_field_first;
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p_pic->i_nb_fields = 2;
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return p_schroframe;
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}
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/*****************************************************************************
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* SchroBufferFree: schro_buffer callback to release the associated block_t
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*****************************************************************************/
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static void SchroBufferFree( SchroBuffer *buf, void *priv )
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{
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block_t *p_block = priv;
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if( !p_block )
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return;
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block_Release( p_block );
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(void)buf;
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}
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/*****************************************************************************
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* CloseDecoder: decoder destruction
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*****************************************************************************/
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static void CloseDecoder( vlc_object_t *p_this )
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{
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decoder_t *p_dec = (decoder_t *)p_this;
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decoder_sys_t *p_sys = p_dec->p_sys;
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schro_decoder_free( p_sys->p_schro );
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free( p_sys );
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}
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/****************************************************************************
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* DecodeBlock: the whole thing
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****************************************************************************
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* Blocks need not be Dirac dataunit aligned.
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* If a block has a PTS signaled, it applies to the first picture at or after p_block
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*
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* If this function returns a picture (!NULL), it is called again and the
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* same block is resubmitted. To avoid this, set *pp_block to NULL;
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* If this function returns NULL, the *pp_block is lost (and leaked).
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* This function must free all blocks when finished with them.
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****************************************************************************/
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static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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if( !pp_block ) return NULL;
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if ( *pp_block ) {
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block_t *p_block = *pp_block;
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/* reset the decoder when seeking as the decode in progress is invalid */
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/* discard the block as it is just a null magic block */
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if( p_block->i_flags & BLOCK_FLAG_DISCONTINUITY ) {
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schro_decoder_reset( p_sys->p_schro );
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p_sys->i_lastpts = VLC_TS_INVALID;
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block_Release( p_block );
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*pp_block = NULL;
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return NULL;
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}
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SchroBuffer *p_schrobuffer;
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p_schrobuffer = schro_buffer_new_with_data( p_block->p_buffer, p_block->i_buffer );
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p_schrobuffer->free = SchroBufferFree;
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p_schrobuffer->priv = p_block;
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if( p_block->i_pts > VLC_TS_INVALID ) {
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mtime_t *p_pts = malloc( sizeof(*p_pts) );
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if( p_pts ) {
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*p_pts = p_block->i_pts;
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/* if this call fails, p_pts is freed automatically */
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p_schrobuffer->tag = schro_tag_new( p_pts, free );
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}
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}
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/* this stops the same block being fed back into this function if
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* we were on the next iteration of this loop to output a picture */
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*pp_block = NULL;
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schro_decoder_autoparse_push( p_sys->p_schro, p_schrobuffer );
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/* DO NOT refer to p_block after this point, it may have been freed */
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}
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while( 1 )
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{
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SchroFrame *p_schroframe;
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picture_t *p_pic;
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int state = schro_decoder_autoparse_wait( p_sys->p_schro );
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switch( state )
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{
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case SCHRO_DECODER_FIRST_ACCESS_UNIT:
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SetVideoFormat( p_dec );
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break;
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case SCHRO_DECODER_NEED_BITS:
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return NULL;
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case SCHRO_DECODER_NEED_FRAME:
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p_schroframe = CreateSchroFrameFromPic( p_dec );
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if( !p_schroframe )
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{
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msg_Err( p_dec, "Could not allocate picture for decoder");
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return NULL;
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}
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schro_decoder_add_output_picture( p_sys->p_schro, p_schroframe);
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break;
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case SCHRO_DECODER_OK: {
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SchroTag *p_tag = schro_decoder_get_picture_tag( p_sys->p_schro );
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p_schroframe = schro_decoder_pull( p_sys->p_schro );
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if( !p_schroframe || !p_schroframe->priv )
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{
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/* frame can't be one that was allocated by us
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* -- no private data: discard */
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if( p_tag ) schro_tag_free( p_tag );
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if( p_schroframe ) schro_frame_unref( p_schroframe );
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break;
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}
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p_pic = ((struct picture_free_t*) p_schroframe->priv)->p_pic;
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p_schroframe->priv = NULL;
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if( p_tag )
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{
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/* free is handled by schro_frame_unref */
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p_pic->date = *(mtime_t*) p_tag->value;
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schro_tag_free( p_tag );
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}
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else if( p_sys->i_lastpts > VLC_TS_INVALID )
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{
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/* NB, this shouldn't happen since the packetizer does a
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* very thorough job of inventing timestamps. The
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* following is just a very rough fall back incase packetizer
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* is missing. */
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/* maybe it would be better to set p_pic->b_force ? */
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p_pic->date = p_sys->i_lastpts + p_sys->i_frame_pts_delta;
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}
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p_sys->i_lastpts = p_pic->date;
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schro_frame_unref( p_schroframe );
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return p_pic;
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}
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case SCHRO_DECODER_EOS:
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/* NB, the new api will not emit _EOS, it handles the reset internally */
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break;
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case SCHRO_DECODER_ERROR:
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msg_Err( p_dec, "SCHRO_DECODER_ERROR");
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return NULL;
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}
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}
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}
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