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570 lines
19 KiB
570 lines
19 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 <vlc_vout.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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/*****************************************************************************
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* picture_pts_t : store pts alongside picture number, not carried through
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* decoder
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*****************************************************************************/
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struct picture_pts_t
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{
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int i_empty; //not in use
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uint32_t u_pnum; //picture number from dirac header
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mtime_t i_pts; //pts for this picture
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};
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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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#define PTS_TLB_SIZE 16
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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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struct picture_pts_t pts_tlb[PTS_TLB_SIZE];
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int i_ts_resync_hack;
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};
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//#define TRACE
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/*****************************************************************************
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* ResetPTStlb: Purge all entries in @p_dec@'s PTS-tlb
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*****************************************************************************/
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static void ResetPTStlb( 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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for( int i=0; i<PTS_TLB_SIZE; i++) {
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p_sys->pts_tlb[i].i_empty = 1;
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}
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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_FOURCC('d','r','a','c') )
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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 = -1;
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p_sys->i_frame_pts_delta = 0;
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p_sys->i_ts_resync_hack = 0;
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ResetPTStlb(p_dec);
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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_FOURCC('I','4','2','0');
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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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double f_aspect;
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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_FOURCC('I','4','2','0'); break;
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case SCHRO_CHROMA_422: p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','2'); break;
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case SCHRO_CHROMA_444: p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','4','4'); 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 =
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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 =
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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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f_aspect = (double)
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( p_sys->p_format->aspect_ratio_numerator * p_sys->p_format->width ) /
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( p_sys->p_format->aspect_ratio_denominator * p_sys->p_format->height);
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p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * f_aspect;
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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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* StorePicturePTS: Store the PTS value for a particular picture number
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*****************************************************************************/
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static void StorePicturePTS( decoder_t *p_dec, block_t *p_block, int i_pupos )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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uint32_t u_pnum;
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mtime_t i_pts;
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u_pnum = GetDWBE( p_block->p_buffer + i_pupos + 13 );
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i_pts = p_block->i_pts > 0 ? p_block->i_pts : p_block->i_dts;
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for( int i=0; i<PTS_TLB_SIZE; i++ ) {
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if( p_sys->pts_tlb[i].i_empty ) {
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p_sys->pts_tlb[i].u_pnum = u_pnum;
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p_sys->pts_tlb[i].i_pts = i_pts;
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p_sys->pts_tlb[i].i_empty = 0;
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return;
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}
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}
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msg_Err( p_dec, "Could not store PTS %"PRId64" for picture %u",
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i_pts, u_pnum );
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}
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/*****************************************************************************
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* GetPicturePTS: Retrieve the PTS value for a particular picture number
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*****************************************************************************/
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static mtime_t GetPicturePTS( decoder_t *p_dec, uint32_t u_pnum )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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for( int i=0; i<PTS_TLB_SIZE; i++ ) {
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if( (!p_sys->pts_tlb[i].i_empty) &&
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(p_sys->pts_tlb[i].u_pnum == u_pnum)) {
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p_sys->pts_tlb[i].i_empty = 1;
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return p_sys->pts_tlb[i].i_pts;
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}
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}
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msg_Err( p_dec, "Could not retrieve PTS for picture %u", u_pnum );
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return 0;
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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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p_free->p_dec->pf_vout_buffer_del( 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 = p_dec->pf_vout_buffer_new( 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 must start with a Dirac parse unit.
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* Blocks must contain at least one Dirac parse unit.
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* Blocks must end with a picture parse unit.
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* Blocks must not contain more than one picture parse unit.
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* If a block has a PTS signaled, it applies to the first picture in p_block
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* - Schroedinger has no internal means to tag pictures with a PTS
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* - In this case, the picture number is extracted and stored in a TLB
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* When a picture is extracted from schro, it is looked up in the pts_tlb
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* - If the picture was never tagged with a PTS, a new one is calculated
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* based upon the frame rate and last output PTS.
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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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int state;
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SchroBuffer *p_schrobuffer;
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SchroFrame *p_schroframe;
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picture_t *p_pic;
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block_t *p_block;
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uint32_t u_pnum;
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if( !pp_block ) return NULL;
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p_block = *pp_block;
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if ( p_block ) do {
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/* prepare block for submission */
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if (p_sys->i_ts_resync_hack && p_sys->i_ts_resync_hack--)
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return NULL;
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if( !p_block->i_buffer ) {
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msg_Err( p_dec, "block is of zero size" );
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break;
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}
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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|BLOCK_FLAG_CORRUPTED) ) {
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#ifdef TRACE
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msg_Dbg( p_dec, "SCHRO_DECODER_RESET" );
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#endif
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schro_decoder_reset( p_sys->p_schro );
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ResetPTStlb( p_dec );
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p_sys->i_lastpts = -1;
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/* The ts layer manages to corrupt the next packet we are to receive
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* Since schro has no sync support, we need to drop it */
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p_sys->i_ts_resync_hack = 1;
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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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/* Unsatisfactory, and will later be fixed in schro:
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* - Schro can only handle a single Dirac parse unit at a time
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* - Multiple parse units may exist in p_block
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* - All mapping specs so far guarantee that p_block would
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* not contain anything after a picture
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* So, we can not give the whole block to schro, but piecemeal
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*/
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size_t i_bufused = 0;
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while( schro_decoder_push_ready( p_sys->p_schro )) {
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if( p_block->i_buffer - i_bufused < 13 ) {
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*pp_block = NULL;
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block_Release( p_block );
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msg_Err( p_dec, "not enough data left in block" );
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break;
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}
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int b_bail = 0;
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size_t i_pulen = GetDWBE( p_block->p_buffer + i_bufused + 5 );
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uint8_t *p_pu = p_block->p_buffer + i_bufused;
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if( 0 == i_pulen ) {
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i_pulen = 13;
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}
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/* blocks that do not start with the parse info prefix are invalid */
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if( p_pu[0] != 'B' || p_pu[1] != 'B' ||
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p_pu[2] != 'C' || p_pu[3] != 'D')
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{
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*pp_block = NULL;
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block_Release( p_block );
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msg_Err( p_dec, "block does not start with dirac parse code" );
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break;
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}
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if( i_bufused + i_pulen > p_block->i_buffer ) {
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*pp_block = NULL;
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block_Release( p_block );
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break;
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}
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if( p_pu[4] & 0x08 )
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StorePicturePTS( p_dec, p_block, i_bufused );
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p_schrobuffer = schro_buffer_new_with_data( p_pu, i_pulen );
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if( i_pulen + i_bufused < p_block->i_buffer ) {
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/* don't let schro free this block, more data still in it */
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p_schrobuffer->free = 0;
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}
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else {
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p_schrobuffer->free = SchroBufferFree;
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p_schrobuffer->priv = p_block;
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b_bail = 1;
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}
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#ifdef TRACE
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msg_Dbg( p_dec, "Inserting bytes into decoder len=%zu of %zu pts=%"PRId64,
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i_pulen, p_block->i_buffer, p_block->i_pts);
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#endif
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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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state = schro_decoder_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 */
|
|
|
|
i_bufused += i_pulen;
|
|
|
|
if( state == SCHRO_DECODER_FIRST_ACCESS_UNIT ) {
|
|
#ifdef TRACE
|
|
msg_Dbg( p_dec, "SCHRO_DECODER_FIRST_ACCESS_UNIT");
|
|
#endif
|
|
SetVideoFormat( p_dec );
|
|
ResetPTStlb( p_dec );
|
|
|
|
p_schroframe = CreateSchroFrameFromPic( p_dec );
|
|
if( p_schroframe ) {
|
|
schro_decoder_add_output_picture( p_sys->p_schro, p_schroframe);
|
|
}
|
|
}
|
|
|
|
if( b_bail )
|
|
break;
|
|
}
|
|
} while( 0 );
|
|
|
|
while( 1 )
|
|
{
|
|
state = schro_decoder_wait( p_sys->p_schro );
|
|
|
|
switch( state )
|
|
{
|
|
case SCHRO_DECODER_NEED_BITS:
|
|
#ifdef TRACE
|
|
msg_Dbg( p_dec, "SCHRO_DECODER_NEED_BITS" );
|
|
#endif
|
|
return NULL;
|
|
|
|
case SCHRO_DECODER_NEED_FRAME:
|
|
#ifdef TRACE
|
|
msg_Dbg( p_dec, "SCHRO_DECODER_NEED_FRAME" );
|
|
#endif
|
|
p_schroframe = CreateSchroFrameFromPic( p_dec );
|
|
|
|
if( !p_schroframe )
|
|
{
|
|
msg_Err( p_dec, "Could not allocate picture for decoder");
|
|
return NULL;
|
|
}
|
|
|
|
schro_decoder_add_output_picture( p_sys->p_schro, p_schroframe);
|
|
break;
|
|
|
|
case SCHRO_DECODER_OK:
|
|
u_pnum = schro_decoder_get_picture_number( p_sys->p_schro );
|
|
p_schroframe = schro_decoder_pull( p_sys->p_schro );
|
|
p_pic = ((struct picture_free_t*) p_schroframe->priv)->p_pic;
|
|
p_schroframe->priv = NULL;
|
|
schro_frame_unref( p_schroframe );
|
|
|
|
/* solve presentation time stamp for picture. If this picture
|
|
* was not tagged with a pts when presented to decoder, interpolate
|
|
* one
|
|
* This means no need to set p_pic->b_force, as we have a pts on
|
|
* each picture */
|
|
p_pic->date = GetPicturePTS( p_dec, u_pnum );
|
|
if (p_sys->i_lastpts >= 0 && p_pic->date == 0)
|
|
p_pic->date = p_sys->i_lastpts + p_sys->i_frame_pts_delta;
|
|
p_sys->i_lastpts = p_pic->date;
|
|
|
|
#ifdef TRACE
|
|
msg_Dbg( p_dec, "SCHRO_DECODER_OK num=%u date=%"PRId64,
|
|
u_pnum, p_pic->date);
|
|
#endif
|
|
return p_pic;
|
|
|
|
case SCHRO_DECODER_EOS:
|
|
#ifdef TRACE
|
|
msg_Dbg( p_dec, "SCHRO_DECODER_EOS");
|
|
#endif
|
|
/* reset the decoder -- schro doesn't do this itself automatically */
|
|
/* there are no more pictures in the output buffer at this point */
|
|
schro_decoder_reset( p_sys->p_schro );
|
|
break;
|
|
|
|
case SCHRO_DECODER_ERROR:
|
|
#ifdef TRACE
|
|
msg_Dbg( p_dec, "SCHRO_DECODER_ERROR");
|
|
#endif
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
|