/* * Copyright (C) 2003-2012 The Music Player Daemon Project * http://www.musicpd.org * * 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. */ #ifndef MPD_OGG_STREAM_HXX #define MPD_OGG_STREAM_HXX #include "check.h" #include <ogg/ogg.h> #include <assert.h> #include <string.h> #include <stdint.h> class OggStream { ogg_stream_state state; bool flush; #ifndef NDEBUG bool initialized; #endif public: #ifndef NDEBUG OggStream():initialized(false) {} ~OggStream() { assert(!initialized); } #endif void Initialize(int serialno) { assert(!initialized); ogg_stream_init(&state, serialno); /* set "flush" to true, so the caller gets the full headers on the first read() */ flush = true; #ifndef NDEBUG initialized = true; #endif } void Reinitialize(int serialno) { assert(initialized); ogg_stream_reset_serialno(&state, serialno); /* set "flush" to true, so the caller gets the full headers on the first read() */ flush = true; } void Deinitialize() { assert(initialized); ogg_stream_clear(&state); #ifndef NDEBUG initialized = false; #endif } void Flush() { assert(initialized); flush = true; } void PacketIn(const ogg_packet &packet) { assert(initialized); ogg_stream_packetin(&state, const_cast<ogg_packet *>(&packet)); } bool PageOut(ogg_page &page) { int result = ogg_stream_pageout(&state, &page); if (result == 0 && flush) { flush = false; result = ogg_stream_flush(&state, &page); } return result != 0; } size_t PageOut(void *_buffer, size_t size) { ogg_page page; if (!PageOut(page)) return 0; assert(page.header_len > 0 || page.body_len > 0); size_t header_len = (size_t)page.header_len; size_t body_len = (size_t)page.body_len; assert(header_len <= size); if (header_len + body_len > size) /* TODO: better overflow handling */ body_len = size - header_len; uint8_t *buffer = (uint8_t *)_buffer; memcpy(buffer, page.header, header_len); memcpy(buffer + header_len, page.body, body_len); return header_len + body_len; } }; #endif