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| /******************************************************************************/ | ||
| /* Mednafen - Multi-system Emulator */ | ||
| /******************************************************************************/ | ||
| /* MTStreamReader.cpp: | ||
| ** Copyright (C) 2019 Mednafen Team | ||
| ** | ||
| ** This program is free software; you can redistribute it and/or | ||
| ** modify it under the terms of the GNU General Public License | ||
| ** as published by the Free Software Foundation; either version 2 | ||
| ** of the License, or (at your option) any later version. | ||
| ** | ||
| ** This program is distributed in the hope that it will be useful, | ||
| ** but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| ** GNU General Public License for more details. | ||
| ** | ||
| ** You should have received a copy of the GNU General Public License | ||
| ** along with this program; if not, write to the Free Software Foundation, Inc., | ||
| ** 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | ||
| */ | ||
|
|
||
| #include <mednafen/mednafen.h> | ||
| #include "MTStreamReader.h" | ||
|
|
||
| #undef NDEBUG | ||
| #include <assert.h> | ||
|
|
||
| namespace Mednafen | ||
| { | ||
|
|
||
| void MTStreamReader::cleanup(void) | ||
| { | ||
| if(thread) | ||
| { | ||
| MThreading::Sem_Wait(ack_sem); | ||
| pending_command = Command_Exit; | ||
| MThreading::Sem_Post(command_sem); | ||
| // | ||
| MThreading::Thread_Wait(thread, nullptr); | ||
| thread = nullptr; | ||
| } | ||
|
|
||
| if(command_sem) | ||
| { | ||
| MThreading::Sem_Destroy(command_sem); | ||
| command_sem = nullptr; | ||
| } | ||
|
|
||
| if(ack_sem) | ||
| { | ||
| MThreading::Sem_Destroy(ack_sem); | ||
| ack_sem = nullptr; | ||
| } | ||
| } | ||
|
|
||
| int MTStreamReader::read_thread_entry_(void* data) | ||
| { | ||
| return ((MTStreamReader*)data)->read_thread_entry(); | ||
| } | ||
|
|
||
| MTStreamReader::MTStreamReader(const uint64 affinity) | ||
| { | ||
| try | ||
| { | ||
| command_sem = MThreading::Sem_Create(); | ||
| ack_sem = MThreading::Sem_Create(); | ||
| thread = MThreading::Thread_Create(read_thread_entry_, this); | ||
| if(affinity) | ||
| MThreading::Thread_SetAffinity(thread, affinity); | ||
|
|
||
| pending_command = Command_NOP; | ||
| MThreading::Sem_Post(command_sem); | ||
| } | ||
| catch(...) | ||
| { | ||
| cleanup(); | ||
| throw; | ||
| } | ||
| } | ||
|
|
||
| MTStreamReader::~MTStreamReader() | ||
| { | ||
| cleanup(); | ||
| } | ||
|
|
||
| void MTStreamReader::zero_into_buffer(uint32 count) | ||
| { | ||
| while(count) | ||
| { | ||
| size_t sub_count = std::min<uint64>(Buffer_Size - (write_pos & Buffer_Size_Mask), count); | ||
|
|
||
| memset(&buffer[write_pos & Buffer_Size_Mask], 0, sub_count); | ||
| //printf("Zero: %04zx %zu\n", write_pos & Buffer_Size_Mask, sub_count); | ||
| write_pos += sub_count; | ||
| count -= sub_count; | ||
| } | ||
| // | ||
| memcpy(&buffer[Buffer_Size], &buffer[0], Overbuffer_Count); | ||
| } | ||
|
|
||
| void MTStreamReader::read_into_buffer(uint32 count) | ||
| { | ||
| assert(count <= Buffer_Size); | ||
| // | ||
| uint8* basep = nullptr; | ||
|
|
||
| //printf("ruh read_into_buffer %u\n", count); | ||
|
|
||
| while(count) | ||
| { | ||
| if(active->pos == active->size) | ||
| { | ||
| //printf("Ruh roh: %u\n", count); | ||
| //puts("Ruh roh"); | ||
| zero_into_buffer(count); | ||
| count = 0; | ||
| break; | ||
| } | ||
| // | ||
| //const size_t prev_pos = active->pos; | ||
| //const size_t prev_write_pos = write_pos; | ||
| size_t sub_count = std::min<uint64>(Buffer_Size - (write_pos & Buffer_Size_Mask), std::min<uint64>(count, active->size - active->pos)); | ||
| uint8* const dp = &buffer[write_pos & Buffer_Size_Mask]; | ||
| if(basep) | ||
| { | ||
| //assert(active->pos == active->loop_pos); | ||
| memmove(dp, basep + (active->pos - active->loop_pos), sub_count); | ||
| } | ||
| else | ||
| active->stream->read(dp, sub_count); | ||
| //printf("Read: %04zx %zu %08x\n", write_pos & Buffer_Size_Mask, sub_count, (uint32)active->pos); | ||
| write_pos += sub_count; | ||
| active->pos += sub_count; | ||
| count -= sub_count; | ||
|
|
||
| if(active->pos == active->size) | ||
| { | ||
| //printf("ruh %llu %llu %llu %u\n", (unsigned long long)active->pos, (unsigned long long)active->size, (unsigned long long)active->loop_pos, count); | ||
| // | ||
| active->pos = active->loop_pos; | ||
|
|
||
| if(!basep) | ||
| { | ||
| if(active->loop_pos < active->size && (active->size - active->loop_pos) == sub_count) | ||
| basep = &buffer[(write_pos - sub_count) & Buffer_Size_Mask]; | ||
| else | ||
| active->stream->seek(active->pos); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if(basep) | ||
| active->stream->seek(active->pos); | ||
| // | ||
| memcpy(&buffer[Buffer_Size], &buffer[0], Overbuffer_Count); | ||
| } | ||
|
|
||
| int MTStreamReader::read_thread_entry(void) | ||
| { | ||
| bool running = true; | ||
|
|
||
| try | ||
| { | ||
| while(running) | ||
| { | ||
| MThreading::Sem_Wait(command_sem); | ||
| // | ||
| const uint32 command = pending_command; | ||
|
|
||
| if(command == Command_Exit) | ||
| { | ||
| running = false; | ||
| } | ||
| else if(command == Command_NOP) | ||
| { | ||
|
|
||
| } | ||
| else if(command == Command_SetActive) | ||
| { | ||
| const uint32 w = pending_which; | ||
| const uint64 skip = pending_skip; | ||
| const uint32 pzb = pending_pzb; | ||
| uint64 pos; | ||
|
|
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| active = &streams[w]; | ||
|
|
||
| if(skip >= active->size) | ||
| { | ||
| if(active->loop_pos == active->size) | ||
| pos = active->size; | ||
| else | ||
| pos = active->loop_pos + ((skip - active->loop_pos) % (active->size - active->loop_pos)); | ||
| } | ||
| else | ||
| pos = skip; | ||
|
|
||
| active->pos = pos; | ||
| active->stream->seek(pos); | ||
| // | ||
| zero_into_buffer(pzb); | ||
| read_into_buffer(Buffer_Size - pzb); | ||
| } | ||
| else if(command == Command_BufferNext) | ||
| { | ||
| read_into_buffer(Chunk_Size); | ||
| } | ||
| // | ||
| MThreading::Sem_Post(ack_sem); | ||
| } | ||
| } | ||
| catch(std::exception& e) | ||
| { | ||
| MDFN_Notify(MDFN_NOTICE_ERROR, _("MTStreamReader() error: %s"), e.what()); | ||
|
|
||
| while(running) | ||
| { | ||
| MThreading::Sem_Wait(command_sem); | ||
| // | ||
| if(pending_command == Command_Exit) | ||
| running = false; | ||
| // | ||
| MThreading::Sem_Post(ack_sem); | ||
| } | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| void MTStreamReader::add_stream(StreamInfo si) | ||
| { | ||
| assert(si.loop_pos <= si.size); | ||
| streams.push_back(std::move(si)); | ||
| } | ||
|
|
||
| } |
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