/***************************************************************************** * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2. ***************************************************************************** * Copyright (C) 1999-2001 VideoLAN * $Id: libmpeg2.c,v 1.18 2003/05/24 13:05:55 massiot Exp $ * * Authors: Gildas Bazin * * 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) */ /***************************************************************************** * dec_thread_t : libmpeg2 decoder thread descriptor *****************************************************************************/ typedef struct dec_thread_t { /* * libmpeg2 properties */ mpeg2dec_t *p_mpeg2dec; const mpeg2_info_t *p_info; vlc_bool_t b_skip; /* * Input properties */ decoder_fifo_t *p_fifo; /* stores the PES stream data */ 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; /* * Output properties */ vout_thread_t *p_vout; vout_synchro_t *p_synchro; } dec_thread_t; /***************************************************************************** * Local prototypes *****************************************************************************/ static int OpenDecoder ( vlc_object_t * ); static int RunDecoder ( decoder_fifo_t * ); static void CloseDecoder ( dec_thread_t * ); static picture_t *GetNewPicture( dec_thread_t *, uint8_t ** ); /***************************************************************************** * Module descriptor *****************************************************************************/ vlc_module_begin(); set_description( _("MPEG I/II video decoder (using libmpeg2)") ); set_capability( "decoder", 40 ); 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_fifo_t *p_fifo = (decoder_fifo_t*) p_this; if( p_fifo->i_fourcc != VLC_FOURCC('m','p','g','v') ) { return VLC_EGENERIC; } p_fifo->pf_run = RunDecoder; return VLC_SUCCESS; } /***************************************************************************** * RunDecoder: the libmpeg2 decoder *****************************************************************************/ static int RunDecoder( decoder_fifo_t *p_fifo ) { dec_thread_t *p_dec; data_packet_t *p_data = NULL; mpeg2_state_t state; picture_t *p_pic; int i_aspect, i_chroma; /* Allocate the memory needed to store the thread's structure */ if( (p_dec = (dec_thread_t *)malloc (sizeof(dec_thread_t)) ) == NULL) { msg_Err( p_fifo, "out of memory" ); goto error; } /* Initialize the thread properties */ memset( p_dec, 0, sizeof(dec_thread_t) ); p_dec->p_fifo = p_fifo; p_dec->p_pes = NULL; p_dec->p_vout = NULL; p_dec->p_mpeg2dec = NULL; p_dec->p_synchro = NULL; p_dec->p_info = NULL; p_dec->i_pts = mdate() + DEFAULT_PTS_DELAY; p_dec->i_current_pts = 0; p_dec->i_previous_pts = 0; p_dec->i_period_remainder = 0; p_dec->p_picture_to_destroy = NULL; p_dec->b_skip = 0; /* Initialize decoder */ p_dec->p_mpeg2dec = mpeg2_init(); if( p_dec->p_mpeg2dec == NULL) goto error; p_dec->p_info = mpeg2_info( p_dec->p_mpeg2dec ); /* libmpeg2 decoder thread's main loop */ while( (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error) ) { state = mpeg2_parse( p_dec->p_mpeg2dec ); switch( state ) { case STATE_BUFFER: /* Feed libmpeg2 a data packet at a time */ if( p_data == NULL ) { /* Get the next PES */ if( p_dec->p_pes ) input_DeletePES( p_dec->p_fifo->p_packets_mgt, p_dec->p_pes ); input_ExtractPES( p_dec->p_fifo, &p_dec->p_pes ); if( !p_dec->p_pes ) { p_dec->p_fifo->b_error = 1; break; } if( p_dec->p_pes->b_discontinuity && p_dec->p_synchro ) { vout_SynchroReset( p_dec->p_synchro ); if ( p_dec->p_info->current_fbuf != NULL ) p_dec->p_picture_to_destroy = p_dec->p_info->current_fbuf->id; } if( p_dec->p_pes->i_pts ) { mpeg2_pts( p_dec->p_mpeg2dec, (uint32_t)p_dec->p_pes->i_pts ); p_dec->i_previous_pts = p_dec->i_current_pts; p_dec->i_current_pts = p_dec->p_pes->i_pts; } p_dec->i_current_rate = p_dec->p_pes->i_rate; p_data = p_dec->p_pes->p_first; } if( p_data != NULL ) { mpeg2_buffer( p_dec->p_mpeg2dec, p_data->p_payload_start, p_data->p_payload_end ); p_data = p_data->p_next; } 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_dec->p_info->sequence->width / p_dec->p_info->sequence->height; break; } } else { /* Use the value provided in the MPEG sequence header */ i_aspect = ((uint64_t)p_dec->p_info->sequence->display_width) * p_dec->p_info->sequence->pixel_width * VOUT_ASPECT_FACTOR / p_dec->p_info->sequence->display_height / p_dec->p_info->sequence->pixel_height; } i_chroma = VLC_FOURCC('Y','V','1','2'); p_dec->p_vout = vout_Request( p_dec->p_fifo, p_dec->p_vout, p_dec->p_info->sequence->width, p_dec->p_info->sequence->height, i_chroma, i_aspect ); msg_Dbg( p_dec->p_fifo, "%dx%d, aspect %d, %u.%03u fps", p_dec->p_info->sequence->width, p_dec->p_info->sequence->height, i_aspect, (u32)((u64)1001000000 * 27 / p_dec->p_info->sequence->frame_period / 1001), (u32)((u64)1001000000 * 27 / p_dec->p_info->sequence->frame_period % 1001) ); mpeg2_custom_fbuf( p_dec->p_mpeg2dec, 1 ); /* Set the first 2 reference frames */ mpeg2_set_buf( p_dec->p_mpeg2dec, buf, NULL ); mpeg2_set_buf( p_dec->p_mpeg2dec, buf, NULL ); if ( p_dec->p_synchro ) { vout_SynchroRelease( p_dec->p_synchro ); } p_dec->p_synchro = vout_SynchroInit( p_dec->p_fifo, p_dec->p_vout, (u32)((u64)1001000000 * 27 / p_dec->p_info->sequence->frame_period) ); } break; case STATE_PICTURE_2ND: vout_SynchroNewPicture( p_dec->p_synchro, p_dec->p_info->current_picture->flags & PIC_MASK_CODING_TYPE, p_dec->p_info->current_picture->nb_fields, 0, 0, p_dec->i_current_rate ); if ( p_dec->b_skip ) { vout_SynchroTrash( p_dec->p_synchro ); } else { vout_SynchroDecode( p_dec->p_synchro ); } break; case STATE_PICTURE: { uint8_t *buf[3]; buf[0] = buf[1] = buf[2] = NULL; vout_SynchroNewPicture( p_dec->p_synchro, p_dec->p_info->current_picture->flags & PIC_MASK_CODING_TYPE, p_dec->p_info->current_picture->nb_fields, (p_dec->p_info->current_picture->flags & PIC_FLAG_PTS) ? ( (p_dec->p_info->current_picture->pts == (uint32_t)p_dec->i_current_pts) ? p_dec->i_current_pts : p_dec->i_previous_pts ) : 0, 0, p_dec->i_current_rate ); if ( !vout_SynchroChoose( p_dec->p_synchro, p_dec->p_info->current_picture->flags & PIC_MASK_CODING_TYPE ) ) { mpeg2_skip( p_dec->p_mpeg2dec, 1 ); p_dec->b_skip = 1; vout_SynchroTrash( p_dec->p_synchro ); mpeg2_set_buf( p_dec->p_mpeg2dec, buf, NULL ); } else { mpeg2_skip( p_dec->p_mpeg2dec, 0 ); p_dec->b_skip = 0; vout_SynchroDecode( p_dec->p_synchro ); if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break; mpeg2_set_buf( p_dec->p_mpeg2dec, buf, p_pic ); } } break; case STATE_END: case STATE_SLICE: if( p_dec->p_info->display_fbuf && p_dec->p_info->display_fbuf->id ) { p_pic = (picture_t *)p_dec->p_info->display_fbuf->id; if ( p_pic != NULL ) { if ( p_dec->p_picture_to_destroy != p_pic ) { vout_SynchroEnd( p_dec->p_synchro, p_dec->p_info->display_picture->flags & PIC_MASK_CODING_TYPE, 0 ); vout_DatePicture( p_dec->p_vout, p_pic, vout_SynchroDate( p_dec->p_synchro ) ); vout_DisplayPicture( p_dec->p_vout, p_pic ); } else { p_dec->p_picture_to_destroy = NULL; vout_SynchroEnd( p_dec->p_synchro, p_dec->p_info->display_picture->flags & PIC_MASK_CODING_TYPE, 1 ); vout_DatePicture( p_dec->p_vout, p_pic, 0 ); vout_DisplayPicture( p_dec->p_vout, p_pic ); } } } if( p_dec->p_info->discard_fbuf && p_dec->p_info->discard_fbuf->id ) { p_pic = (picture_t *)p_dec->p_info->discard_fbuf->id; vout_UnlinkPicture( p_dec->p_vout, p_pic ); } break; case STATE_INVALID: { uint8_t *buf[3]; buf[0] = buf[1] = buf[2] = NULL; msg_Warn( p_dec->p_fifo, "invalid picture encountered" ); if ( (p_dec->p_info->current_picture->flags & PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) { vout_SynchroReset( p_dec->p_synchro ); } mpeg2_skip( p_dec->p_mpeg2dec, 1 ); p_dec->b_skip = 1; if( p_dec->p_info->current_fbuf && p_dec->p_info->current_fbuf->id ) { p_pic = (picture_t *)p_dec->p_info->current_fbuf->id; vout_UnlinkPicture( p_dec->p_vout, p_pic ); vout_DestroyPicture( p_dec->p_vout, p_pic ); } mpeg2_set_buf( p_dec->p_mpeg2dec, buf, NULL ); break; } default: break; } } /* If b_error is set, the libmpeg2 decoder thread enters the error loop */ if( p_dec->p_fifo->b_error ) { DecoderError( p_dec->p_fifo ); } /* End of the libmpeg2 decoder thread */ CloseDecoder( p_dec ); return 0; error: DecoderError( p_fifo ); if( p_dec ) { if( p_dec->p_fifo ) p_dec->p_fifo->b_error = 1; /* End of the libmpeg2 decoder thread */ CloseDecoder( p_dec ); } return -1; } /***************************************************************************** * CloseDecoder: libmpeg2 decoder destruction *****************************************************************************/ static void CloseDecoder( dec_thread_t * p_dec ) { if( p_dec ) { int i_pic; if( p_dec->p_pes ) input_DeletePES( p_dec->p_fifo->p_packets_mgt, p_dec->p_pes ); if( p_dec->p_synchro ) vout_SynchroRelease( p_dec->p_synchro ); if( p_dec->p_vout ) { /* Temporary hack to free the pictures in use by libmpeg2 */ for( i_pic = 0; i_pic < p_dec->p_vout->render.i_pictures; i_pic++ ) { if( p_dec->p_vout->render.pp_picture[i_pic]->i_status == RESERVED_PICTURE ) vout_DestroyPicture( p_dec->p_vout, p_dec->p_vout->render.pp_picture[i_pic] ); if( p_dec->p_vout->render.pp_picture[i_pic]->i_refcount > 0 ) vout_UnlinkPicture( p_dec->p_vout, p_dec->p_vout->render.pp_picture[i_pic] ); } vout_Request( p_dec->p_fifo, p_dec->p_vout, 0, 0, 0, 0 ); } if( p_dec->p_mpeg2dec ) mpeg2_close( p_dec->p_mpeg2dec ); free( p_dec ); } } /***************************************************************************** * GetNewPicture: Get a new picture from the vout and set the buf struct *****************************************************************************/ static picture_t *GetNewPicture( dec_thread_t *p_dec, uint8_t **pp_buf ) { picture_t *p_pic; /* Get a new picture */ while( !(p_pic = vout_CreatePicture( p_dec->p_vout, 0, 0, 0 ) ) ) { 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_dec->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; }