/***************************************************************************** * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2. ***************************************************************************** * Copyright (C) 1999-2001 VideoLAN * $Id: libmpeg2.c,v 1.29 2003/10/01 22:40:39 hartman Exp $ * * Authors: Gildas Bazin * Christophe Massiot * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. *****************************************************************************/ /***************************************************************************** * Preamble *****************************************************************************/ #include #include #include #include #include /* malloc(), free() */ #include /* memcpy(), memset() */ #include #include "vout_synchro.h" /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */ #define AR_SQUARE_PICTURE 1 /* square pixels */ #define AR_3_4_PICTURE 2 /* 3:4 picture (TV) */ #define AR_16_9_PICTURE 3 /* 16:9 picture (wide screen) */ #define AR_221_1_PICTURE 4 /* 2.21:1 picture (movie) */ /***************************************************************************** * decoder_sys_t : libmpeg2 decoder descriptor *****************************************************************************/ struct decoder_sys_t { /* * libmpeg2 properties */ mpeg2dec_t *p_mpeg2dec; const mpeg2_info_t *p_info; vlc_bool_t b_skip; /* * Input properties */ pes_packet_t *p_pes; /* current PES we are decoding */ mtime_t i_pts; mtime_t i_previous_pts; mtime_t i_current_pts; mtime_t i_period_remainder; int i_current_rate; picture_t * p_picture_to_destroy; vlc_bool_t b_garbage_pic; vlc_bool_t b_after_sequence_header; /* is it the next frame after * the sequence header ? */ vlc_bool_t b_slice_i; /* intra-slice refresh stream */ /* * Output properties */ vout_thread_t *p_vout; vout_synchro_t *p_synchro; }; /***************************************************************************** * Local prototypes *****************************************************************************/ static int OpenDecoder ( vlc_object_t * ); static int InitDecoder ( decoder_t * ); static int RunDecoder ( decoder_t *, block_t * ); static int EndDecoder ( decoder_t * ); static picture_t *GetNewPicture( decoder_t *, uint8_t ** ); /***************************************************************************** * Module descriptor *****************************************************************************/ vlc_module_begin(); set_description( _("MPEG I/II video decoder (using libmpeg2)") ); set_capability( "decoder", 150 ); set_callbacks( OpenDecoder, NULL ); add_shortcut( "libmpeg2" ); vlc_module_end(); /***************************************************************************** * OpenDecoder: probe the decoder and return score *****************************************************************************/ static int OpenDecoder( vlc_object_t *p_this ) { decoder_t *p_dec = (decoder_t*)p_this; if( p_dec->p_fifo->i_fourcc != VLC_FOURCC('m','p','g','v') && p_dec->p_fifo->i_fourcc != VLC_FOURCC('m','p','g','1') && p_dec->p_fifo->i_fourcc != VLC_FOURCC('P','I','M','1') && /* Pinnacle hardware-mpeg1 */ p_dec->p_fifo->i_fourcc != VLC_FOURCC('V','C','R','2') && /* ATI Video */ p_dec->p_fifo->i_fourcc != VLC_FOURCC('m','p','g','2') ) { return VLC_EGENERIC; } p_dec->pf_init = InitDecoder; p_dec->pf_decode = RunDecoder; p_dec->pf_end = EndDecoder; return VLC_SUCCESS; } /***************************************************************************** * InitDecoder: Initalize the decoder *****************************************************************************/ static int InitDecoder( decoder_t *p_dec ) { /* Allocate the memory needed to store the decoder's structure */ if( ( p_dec->p_sys = (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL ) { msg_Err( p_dec, "out of memory" ); return VLC_EGENERIC; } /* Initialize the thread properties */ memset( p_dec->p_sys, 0, sizeof(decoder_sys_t) ); p_dec->p_sys->p_pes = NULL; p_dec->p_sys->p_vout = NULL; p_dec->p_sys->p_mpeg2dec = NULL; p_dec->p_sys->p_synchro = NULL; p_dec->p_sys->p_info = NULL; p_dec->p_sys->i_pts = mdate() + DEFAULT_PTS_DELAY; p_dec->p_sys->i_current_pts = 0; p_dec->p_sys->i_previous_pts = 0; p_dec->p_sys->i_period_remainder = 0; p_dec->p_sys->p_picture_to_destroy = NULL; p_dec->p_sys->b_garbage_pic = 0; p_dec->p_sys->b_slice_i = 0; p_dec->p_sys->b_skip = 0; /* Initialize decoder */ p_dec->p_sys->p_mpeg2dec = mpeg2_init(); if( p_dec->p_sys->p_mpeg2dec == NULL) { msg_Err( p_dec, "mpeg2_init() failed" ); free( p_dec->p_sys ); return VLC_EGENERIC; } p_dec->p_sys->p_info = mpeg2_info( p_dec->p_sys->p_mpeg2dec ); return VLC_SUCCESS; } /***************************************************************************** * RunDecoder: the libmpeg2 decoder *****************************************************************************/ static int RunDecoder( decoder_t *p_dec, block_t *p_block ) { decoder_sys_t *p_sys = p_dec->p_sys; mpeg2_state_t state; picture_t *p_pic; int i_aspect; vlc_bool_t b_need_more_data = VLC_FALSE; while( 1 ) { if( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error ) { block_Release( p_block ); return VLC_EGENERIC; } state = mpeg2_parse( p_sys->p_mpeg2dec ); switch( state ) { case STATE_BUFFER: if( !p_block->i_buffer || b_need_more_data ) { block_Release( p_block ); return VLC_SUCCESS; } if( p_block->b_discontinuity && p_sys->p_synchro && p_sys->p_info->sequence->width != (unsigned)-1 ) { vout_SynchroReset( p_sys->p_synchro ); if( p_sys->p_info->current_fbuf != NULL && p_sys->p_info->current_fbuf->id != NULL ) { p_sys->b_garbage_pic = 1; p_pic = p_sys->p_info->current_fbuf->id; } else { uint8_t *buf[3]; buf[0] = buf[1] = buf[2] = NULL; if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break; mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic ); } p_sys->p_picture_to_destroy = p_pic; memset( p_pic->p[0].p_pixels, 0, p_sys->p_info->sequence->width * p_sys->p_info->sequence->height ); memset( p_pic->p[1].p_pixels, 0x80, p_sys->p_info->sequence->width * p_sys->p_info->sequence->height / 4 ); memset( p_pic->p[2].p_pixels, 0x80, p_sys->p_info->sequence->width * p_sys->p_info->sequence->height / 4 ); if ( p_sys->b_slice_i ) { vout_SynchroNewPicture( p_sys->p_synchro, I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate ); vout_SynchroDecode( p_sys->p_synchro ); vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 ); } } if( p_block->i_pts ) { mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts ); p_sys->i_previous_pts = p_sys->i_current_pts; p_sys->i_current_pts = p_block->i_pts; } p_sys->i_current_rate = DEFAULT_RATE;//p_pes->i_rate; mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer, p_block->p_buffer + p_block->i_buffer ); b_need_more_data = VLC_TRUE; break; case STATE_SEQUENCE: { /* Initialize video output */ uint8_t *buf[3]; buf[0] = buf[1] = buf[2] = NULL; /* Check whether the input gives a particular aspect ratio */ if( p_dec->p_fifo->p_demux_data && ( *(int*)(p_dec->p_fifo->p_demux_data) & 0x7 ) ) { i_aspect = *(int*)(p_dec->p_fifo->p_demux_data); switch( i_aspect ) { case AR_3_4_PICTURE: i_aspect = VOUT_ASPECT_FACTOR * 4 / 3; break; case AR_16_9_PICTURE: i_aspect = VOUT_ASPECT_FACTOR * 16 / 9; break; case AR_221_1_PICTURE: i_aspect = VOUT_ASPECT_FACTOR * 221 / 100; break; case AR_SQUARE_PICTURE: default: i_aspect = VOUT_ASPECT_FACTOR * p_sys->p_info->sequence->width / p_sys->p_info->sequence->height; break; } } else { /* Use the value provided in the MPEG sequence header */ i_aspect = ((uint64_t)p_sys->p_info->sequence->display_width) * p_sys->p_info->sequence->pixel_width * VOUT_ASPECT_FACTOR / p_sys->p_info->sequence->display_height / p_sys->p_info->sequence->pixel_height; } if ( p_dec->p_sys->p_vout != NULL ) { int i_pic; /* Temporary hack to free the pictures in use by libmpeg2 */ for ( i_pic = 0; i_pic < p_dec->p_sys->p_vout->render.i_pictures; i_pic++ ) { if( p_dec->p_sys->p_vout->render.pp_picture[i_pic]->i_status == RESERVED_PICTURE ) vout_DestroyPicture( p_dec->p_sys->p_vout, p_dec->p_sys->p_vout->render.pp_picture[i_pic] ); if( p_dec->p_sys->p_vout->render.pp_picture[i_pic]->i_refcount > 0 ) vout_UnlinkPicture( p_dec->p_sys->p_vout, p_dec->p_sys->p_vout->render.pp_picture[i_pic] ); } } p_sys->p_vout = vout_Request( p_dec, p_sys->p_vout, p_sys->p_info->sequence->width, p_sys->p_info->sequence->height, VLC_FOURCC('Y','V','1','2'), i_aspect ); if(p_sys->p_vout == NULL ) { msg_Err( p_dec, "cannot create vout" ); block_Release( p_block ); return -1; } msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps", p_sys->p_info->sequence->width, p_sys->p_info->sequence->height, i_aspect, (uint32_t)((u64)1001000000 * 27 / p_sys->p_info->sequence->frame_period / 1001), (uint32_t)((u64)1001000000 * 27 / p_sys->p_info->sequence->frame_period % 1001) ); mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 ); /* Set the first 2 reference frames */ mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL ); if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break; memset( p_pic->p[0].p_pixels, 0, p_sys->p_info->sequence->width * p_sys->p_info->sequence->height ); memset( p_pic->p[1].p_pixels, 0x80, p_sys->p_info->sequence->width * p_sys->p_info->sequence->height / 4 ); memset( p_pic->p[2].p_pixels, 0x80, p_sys->p_info->sequence->width * p_sys->p_info->sequence->height / 4 ); mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic ); /* This picture will never go through display_picture. */ vout_DatePicture( p_sys->p_vout, p_pic, 0 ); vout_DisplayPicture( p_sys->p_vout, p_pic ); /* For some reason, libmpeg2 will put this pic twice in * discard_picture. This can be considered a bug in libmpeg2. */ vout_LinkPicture( p_sys->p_vout, p_pic ); if ( p_sys->p_synchro ) { vout_SynchroRelease( p_sys->p_synchro ); } p_sys->p_synchro = vout_SynchroInit( p_dec, p_sys->p_vout, (uint32_t)((uint64_t)1001000000 * 27 / p_sys->p_info->sequence->frame_period) ); p_sys->b_after_sequence_header = 1; } break; case STATE_PICTURE_2ND: vout_SynchroNewPicture( p_sys->p_synchro, p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE, p_sys->p_info->current_picture->nb_fields, 0, 0, p_sys->i_current_rate ); if ( p_sys->b_skip ) { vout_SynchroTrash( p_sys->p_synchro ); } else { vout_SynchroDecode( p_sys->p_synchro ); } break; case STATE_PICTURE: { uint8_t *buf[3]; buf[0] = buf[1] = buf[2] = NULL; if ( p_sys->b_after_sequence_header && ((p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) ) { /* Intra-slice refresh. Simulate a blank I picture. */ msg_Dbg( p_dec, "intra-slice refresh stream" ); vout_SynchroNewPicture( p_sys->p_synchro, I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate ); vout_SynchroDecode( p_sys->p_synchro ); vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 ); p_sys->b_slice_i = 1; } p_sys->b_after_sequence_header = 0; vout_SynchroNewPicture( p_sys->p_synchro, p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE, p_sys->p_info->current_picture->nb_fields, (p_sys->p_info->current_picture->flags & PIC_FLAG_PTS) ? ( ( p_sys->p_info->current_picture->pts == (uint32_t)p_sys->i_current_pts ) ? p_sys->i_current_pts : p_sys->i_previous_pts ) : 0, 0, p_sys->i_current_rate ); if ( !(p_sys->b_slice_i && ((p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE) == P_CODING_TYPE)) && !vout_SynchroChoose( p_sys->p_synchro, p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE ) ) { mpeg2_skip( p_sys->p_mpeg2dec, 1 ); p_sys->b_skip = 1; vout_SynchroTrash( p_sys->p_synchro ); mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL ); } else { mpeg2_skip( p_sys->p_mpeg2dec, 0 ); p_sys->b_skip = 0; vout_SynchroDecode( p_sys->p_synchro ); if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break; mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic ); } } break; case STATE_END: case STATE_SLICE: if( p_sys->p_info->display_fbuf && p_sys->p_info->display_fbuf->id ) { p_pic = (picture_t *)p_sys->p_info->display_fbuf->id; vout_SynchroEnd( p_sys->p_synchro, p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE, p_sys->b_garbage_pic ); p_sys->b_garbage_pic = 0; vout_DisplayPicture( p_sys->p_vout, p_pic ); if ( p_sys->p_picture_to_destroy != p_pic ) { vout_DatePicture( p_sys->p_vout, p_pic, vout_SynchroDate( p_sys->p_synchro ) ); } else { p_sys->p_picture_to_destroy = NULL; vout_DatePicture( p_sys->p_vout, p_pic, 0 ); } } if( p_sys->p_info->discard_fbuf && p_sys->p_info->discard_fbuf->id ) { p_pic = (picture_t *)p_sys->p_info->discard_fbuf->id; vout_UnlinkPicture( p_sys->p_vout, p_pic ); } break; case STATE_INVALID: { uint8_t *buf[3]; buf[0] = buf[1] = buf[2] = NULL; msg_Warn( p_dec, "invalid picture encountered" ); if ( ( p_sys->p_info->current_picture == NULL ) || ( ( p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) ) { vout_SynchroReset( p_sys->p_synchro ); } mpeg2_skip( p_sys->p_mpeg2dec, 1 ); p_sys->b_skip = 1; if( p_sys->p_info->current_fbuf && p_sys->p_info->current_fbuf->id ) { p_sys->b_garbage_pic = 1; p_pic = p_sys->p_info->current_fbuf->id; } else { if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break; mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic ); } p_sys->p_picture_to_destroy = p_pic; memset( p_pic->p[0].p_pixels, 0, p_sys->p_info->sequence->width * p_sys->p_info->sequence->height ); memset( p_pic->p[1].p_pixels, 0x80, p_sys->p_info->sequence->width * p_sys->p_info->sequence->height / 4 ); memset( p_pic->p[2].p_pixels, 0x80, p_sys->p_info->sequence->width * p_sys->p_info->sequence->height / 4 ); if ( p_sys->b_slice_i ) { vout_SynchroNewPicture( p_sys->p_synchro, I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate ); vout_SynchroDecode( p_sys->p_synchro ); vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 ); } break; } default: break; } } block_Release( p_block ); return VLC_EGENERIC; } /***************************************************************************** * EndDecoder: libmpeg2 decoder destruction *****************************************************************************/ static int EndDecoder( decoder_t * p_dec ) { decoder_sys_t *p_sys = p_dec->p_sys; if( p_sys ) { int i_pic; if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro ); if( p_sys->p_vout ) { /* Temporary hack to free the pictures in use by libmpeg2 */ for( i_pic = 0; i_pic < p_sys->p_vout->render.i_pictures; i_pic++ ) { if( p_sys->p_vout->render.pp_picture[i_pic]->i_status == RESERVED_PICTURE ) vout_DestroyPicture( p_sys->p_vout, p_sys->p_vout->render.pp_picture[i_pic] ); if( p_sys->p_vout->render.pp_picture[i_pic]->i_refcount > 0 ) vout_UnlinkPicture( p_sys->p_vout, p_sys->p_vout->render.pp_picture[i_pic] ); } vout_Request( p_dec, p_sys->p_vout, 0, 0, 0, 0 ); } if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec ); free( p_sys ); } return VLC_SUCCESS; } /***************************************************************************** * GetNewPicture: Get a new picture from the vout and set the buf struct *****************************************************************************/ static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf ) { decoder_sys_t *p_sys = p_dec->p_sys; picture_t *p_pic; vlc_bool_t b_progressive = p_sys->p_info->current_picture != NULL ? p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1; vlc_bool_t b_top_field_first = p_sys->p_info->current_picture != NULL ? p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1; unsigned int i_nb_fields = p_sys->p_info->current_picture != NULL ? p_sys->p_info->current_picture->nb_fields : 2; /* Get a new picture */ while( !(p_pic = vout_CreatePicture( p_sys->p_vout, b_progressive, b_top_field_first, i_nb_fields )) ) { if( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error ) break; msleep( VOUT_OUTMEM_SLEEP ); } if( p_pic == NULL ) return NULL; vout_LinkPicture( p_sys->p_vout, p_pic ); pp_buf[0] = p_pic->p[0].p_pixels; pp_buf[1] = p_pic->p[1].p_pixels; pp_buf[2] = p_pic->p[2].p_pixels; return p_pic; }