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1143 lines
33 KiB
C
1143 lines
33 KiB
C
/*
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* Copyright 2006 BBC and Fluendo S.A.
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*
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* This library is licensed under 4 different licenses and you
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* can choose to use it under the terms of any one of them. The
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* four licenses are the MPL 1.1, the LGPL, the GPL and the MIT
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* license.
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*
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* MPL:
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/.
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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* License for the specific language governing rights and limitations
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* under the License.
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*
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* LGPL:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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* GPL:
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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 St, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* MIT:
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*
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* Unless otherwise indicated, Source Code is licensed under MIT license.
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* See further explanation attached in License Statement (distributed in the file
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* LICENSE).
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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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 <string.h>
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#include "tsmux.h"
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#include "tsmuxstream.h"
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#include "crc.h"
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#define GST_CAT_DEFAULT mpegtsmux_debug
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/* Maximum total data length for a PAT section is 1024 bytes, minus an
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* 8 byte header, then the length of each program entry is 32 bits,
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* then finally a 32 bit CRC. Thus the maximum number of programs in this mux
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* is (1024 - 8 - 4) / 4 = 253 because it only supports single section PATs */
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#define TSMUX_MAX_PROGRAMS 253
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#define TSMUX_SECTION_HDR_SIZE 8
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#define TSMUX_DEFAULT_NETWORK_ID 0x0001
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#define TSMUX_DEFAULT_TS_ID 0x0001
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/* HACK: We use a fixed buffering offset for the PCR at the moment -
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* this is the amount 'in advance' of the stream that the PCR sits.
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* 1/8 second atm */
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#define TSMUX_PCR_OFFSET (TSMUX_CLOCK_FREQ / 8)
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/* Times per second to write PCR */
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#define TSMUX_DEFAULT_PCR_FREQ (25)
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/* Base for all written PCR and DTS/PTS,
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* so we have some slack to go backwards */
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#define CLOCK_BASE (TSMUX_CLOCK_FREQ * 10 * 360)
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static gboolean tsmux_write_pat (TsMux * mux);
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static gboolean tsmux_write_pmt (TsMux * mux, TsMuxProgram * program);
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/**
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* tsmux_new:
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*
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* Create a new muxer session.
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*
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* Returns: A new #TsMux object.
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*/
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TsMux *
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tsmux_new (void)
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{
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TsMux *mux;
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mux = g_slice_new0 (TsMux);
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mux->transport_id = TSMUX_DEFAULT_TS_ID;
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mux->next_pgm_no = TSMUX_START_PROGRAM_ID;
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mux->next_pmt_pid = TSMUX_START_PMT_PID;
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mux->next_stream_pid = TSMUX_START_ES_PID;
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mux->pat_changed = TRUE;
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mux->last_pat_ts = -1;
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mux->pat_interval = TSMUX_DEFAULT_PAT_INTERVAL;
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return mux;
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}
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/**
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* tsmux_set_write_func:
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* @mux: a #TsMux
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* @func: a user callback function
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* @user_data: user data passed to @func
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*
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* Set the callback function and user data to be called when @mux has output to
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* produce. @user_data will be passed as user data in @func.
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*/
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void
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tsmux_set_write_func (TsMux * mux, TsMuxWriteFunc func, void *user_data)
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{
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g_return_if_fail (mux != NULL);
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mux->write_func = func;
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mux->write_func_data = user_data;
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}
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/**
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* tsmux_set_alloc_func:
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* @mux: a #TsMux
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* @func: a user callback function
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* @user_data: user data passed to @func
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*
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* Set the callback function and user data to be called when @mux needs
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* a new buffer to write a packet into.
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* @user_data will be passed as user data in @func.
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*/
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void
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tsmux_set_alloc_func (TsMux * mux, TsMuxAllocFunc func, void *user_data)
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{
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g_return_if_fail (mux != NULL);
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mux->alloc_func = func;
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mux->alloc_func_data = user_data;
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}
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/**
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* tsmux_set_pat_interval:
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* @mux: a #TsMux
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* @freq: a new PAT interval
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*
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* Set the interval (in cycles of the 90kHz clock) for writing out the PAT table.
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*
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* Many transport stream clients might have problems if the PAT table is not
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* inserted in the stream at regular intervals, especially when initially trying
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* to figure out the contents of the stream.
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*/
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void
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tsmux_set_pat_interval (TsMux * mux, guint freq)
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{
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g_return_if_fail (mux != NULL);
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mux->pat_interval = freq;
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}
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/**
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* tsmux_get_pat_interval:
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* @mux: a #TsMux
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*
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* Get the configured PAT interval. See also tsmux_set_pat_interval().
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*
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* Returns: the configured PAT interval
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*/
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guint
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tsmux_get_pat_interval (TsMux * mux)
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{
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g_return_val_if_fail (mux != NULL, 0);
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return mux->pat_interval;
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}
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/**
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* tsmux_free:
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* @mux: a #TsMux
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*
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* Free all resources associated with @mux. After calling this function @mux can
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* not be used anymore.
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*/
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void
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tsmux_free (TsMux * mux)
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{
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GList *cur;
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g_return_if_fail (mux != NULL);
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/* Free all programs */
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for (cur = mux->programs; cur; cur = cur->next) {
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TsMuxProgram *program = (TsMuxProgram *) cur->data;
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tsmux_program_free (program);
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}
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g_list_free (mux->programs);
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/* Free all streams */
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for (cur = mux->streams; cur; cur = cur->next) {
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TsMuxStream *stream = (TsMuxStream *) cur->data;
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tsmux_stream_free (stream);
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}
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g_list_free (mux->streams);
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g_slice_free (TsMux, mux);
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}
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/**
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* tsmux_program_new:
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* @mux: a #TsMux
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*
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* Create a new program in the mising session @mux.
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*
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* Returns: a new #TsMuxProgram or %NULL when the maximum number of programs has
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* been reached.
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*/
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TsMuxProgram *
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tsmux_program_new (TsMux * mux)
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{
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TsMuxProgram *program;
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g_return_val_if_fail (mux != NULL, NULL);
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/* Ensure we have room for another program */
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if (mux->nb_programs == TSMUX_MAX_PROGRAMS)
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return NULL;
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program = g_slice_new0 (TsMuxProgram);
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program->pmt_changed = TRUE;
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program->last_pmt_ts = -1;
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program->pmt_interval = TSMUX_DEFAULT_PMT_INTERVAL;
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program->pgm_number = mux->next_pgm_no++;
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program->pmt_pid = mux->next_pmt_pid++;
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program->pcr_stream = NULL;
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program->streams = g_array_sized_new (FALSE, TRUE, sizeof (TsMuxStream *), 1);
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mux->programs = g_list_prepend (mux->programs, program);
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mux->nb_programs++;
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mux->pat_changed = TRUE;
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return program;
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}
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/**
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* tsmux_set_pmt_interval:
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* @program: a #TsMuxProgram
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* @freq: a new PMT interval
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*
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* Set the interval (in cycles of the 90kHz clock) for writing out the PMT table.
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*
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* Many transport stream clients might have problems if the PMT table is not
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* inserted in the stream at regular intervals, especially when initially trying
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* to figure out the contents of the stream.
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*/
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void
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tsmux_set_pmt_interval (TsMuxProgram * program, guint freq)
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{
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g_return_if_fail (program != NULL);
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program->pmt_interval = freq;
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}
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/**
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* tsmux_get_pmt_interval:
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* @program: a #TsMuxProgram
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*
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* Get the configured PMT interval. See also tsmux_set_pmt_interval().
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*
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* Returns: the configured PMT interval
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*/
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guint
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tsmux_get_pmt_interval (TsMuxProgram * program)
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{
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g_return_val_if_fail (program != NULL, 0);
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return program->pmt_interval;
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}
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/**
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* tsmux_program_add_stream:
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* @program: a #TsMuxProgram
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* @stream: a #TsMuxStream
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*
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* Add @stream to @program.
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*/
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void
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tsmux_program_add_stream (TsMuxProgram * program, TsMuxStream * stream)
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{
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g_return_if_fail (program != NULL);
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g_return_if_fail (stream != NULL);
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g_array_append_val (program->streams, stream);
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program->pmt_changed = TRUE;
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}
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/**
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* tsmux_program_set_pcr_stream:
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* @program: a #TsMuxProgram
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* @stream: a #TsMuxStream
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*
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* Set @stream as the PCR stream for @program, overwriting the previously
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* configured PCR stream. When @stream is NULL, program will have no PCR stream
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* configured.
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*/
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void
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tsmux_program_set_pcr_stream (TsMuxProgram * program, TsMuxStream * stream)
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{
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g_return_if_fail (program != NULL);
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if (program->pcr_stream == stream)
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return;
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if (program->pcr_stream != NULL)
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tsmux_stream_pcr_unref (program->pcr_stream);
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if (stream)
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tsmux_stream_pcr_ref (stream);
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program->pcr_stream = stream;
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program->pmt_changed = TRUE;
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}
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/**
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* tsmux_get_new_pid:
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* @mux: a #TsMux
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*
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* Get a new free PID.
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*
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* Returns: a new free PID.
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*/
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guint16
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tsmux_get_new_pid (TsMux * mux)
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{
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g_return_val_if_fail (mux != NULL, -1);
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/* make sure this PID is free
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* (and not taken by a specific earlier request) */
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do {
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mux->next_stream_pid++;
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} while (tsmux_find_stream (mux, mux->next_stream_pid));
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return mux->next_stream_pid;
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}
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/**
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* tsmux_create_stream:
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* @mux: a #TsMux
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* @stream_type: a #TsMuxStreamType
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* @pid: the PID of the new stream.
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*
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* Create a new stream of @stream_type in the muxer session @mux.
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*
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* When @pid is set to #TSMUX_PID_AUTO, a new free PID will automatically
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* be allocated for the new stream.
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*
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* Returns: a new #TsMuxStream.
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*/
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TsMuxStream *
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tsmux_create_stream (TsMux * mux, TsMuxStreamType stream_type, guint16 pid)
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{
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TsMuxStream *stream;
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guint16 new_pid;
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g_return_val_if_fail (mux != NULL, NULL);
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if (pid == TSMUX_PID_AUTO) {
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new_pid = tsmux_get_new_pid (mux);
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} else {
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new_pid = pid & 0x1FFF;
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}
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/* Ensure we're not creating a PID collision */
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if (tsmux_find_stream (mux, new_pid))
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return NULL;
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stream = tsmux_stream_new (new_pid, stream_type);
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mux->streams = g_list_prepend (mux->streams, stream);
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mux->nb_streams++;
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return stream;
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}
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/**
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* tsmux_find_stream:
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* @mux: a #TsMux
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* @pid: the PID to find.
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*
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* Find the stream associated wih PID.
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*
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* Returns: a #TsMuxStream with @pid or NULL when the stream was not found.
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*/
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TsMuxStream *
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tsmux_find_stream (TsMux * mux, guint16 pid)
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{
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TsMuxStream *found = NULL;
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GList *cur;
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g_return_val_if_fail (mux != NULL, NULL);
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for (cur = mux->streams; cur; cur = cur->next) {
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TsMuxStream *stream = (TsMuxStream *) cur->data;
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if (tsmux_stream_get_pid (stream) == pid) {
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found = stream;
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break;
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}
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}
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return found;
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}
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static gboolean
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tsmux_get_buffer (TsMux * mux, GstBuffer ** buf)
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{
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g_return_val_if_fail (buf, FALSE);
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if (G_UNLIKELY (!mux->alloc_func))
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return FALSE;
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mux->alloc_func (buf, mux->alloc_func_data);
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if (!*buf)
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return FALSE;
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g_assert (gst_buffer_get_size (*buf) == TSMUX_PACKET_LENGTH);
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return TRUE;
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}
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static gboolean
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tsmux_packet_out (TsMux * mux, GstBuffer * buf, gint64 pcr)
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{
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if (G_UNLIKELY (mux->write_func == NULL)) {
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if (buf)
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gst_buffer_unref (buf);
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return TRUE;
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}
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return mux->write_func (buf, mux->write_func_data, pcr);
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}
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/*
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* adaptation_field() {
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* adaptation_field_length 8 uimsbf
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|
* if(adaptation_field_length >0) {
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* discontinuity_indicator 1 bslbf
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* random_access_indicator 1 bslbf
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* elementary_stream_priority_indicator 1 bslbf
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* PCR_flag 1 bslbf
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* OPCR_flag 1 bslbf
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* splicing_point_flag 1 bslbf
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* transport_private_data_flag 1 bslbf
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* adaptation_field_extension_flag 1 bslbf
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* if(PCR_flag == '1') {
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* program_clock_reference_base 33 uimsbf
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* reserved 6 bslbf
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* program_clock_reference_extension 9 uimsbf
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* }
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* if(OPCR_flag == '1') {
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* original_program_clock_reference_base 33 uimsbf
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* reserved 6 bslbf
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|
* original_program_clock_reference_extension 9 uimsbf
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|
* }
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* if (splicing_point_flag == '1') {
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* splice_countdown 8 tcimsbf
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* }
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* if(transport_private_data_flag == '1') {
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* transport_private_data_length 8 uimsbf
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* for (i=0; i<transport_private_data_length;i++){
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* private_data_byte 8 bslbf
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|
* }
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|
* }
|
|
* if (adaptation_field_extension_flag == '1' ) {
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* adaptation_field_extension_length 8 uimsbf
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|
* ltw_flag 1 bslbf
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|
* piecewise_rate_flag 1 bslbf
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|
* seamless_splice_flag 1 bslbf
|
|
* reserved 5 bslbf
|
|
* if (ltw_flag == '1') {
|
|
* ltw_valid_flag 1 bslbf
|
|
* ltw_offset 15 uimsbf
|
|
* }
|
|
* if (piecewise_rate_flag == '1') {
|
|
* reserved 2 bslbf
|
|
* piecewise_rate 22 uimsbf
|
|
* }
|
|
* if (seamless_splice_flag == '1'){
|
|
* splice_type 4 bslbf
|
|
* DTS_next_AU[32..30] 3 bslbf
|
|
* marker_bit 1 bslbf
|
|
* DTS_next_AU[29..15] 15 bslbf
|
|
* marker_bit 1 bslbf
|
|
* DTS_next_AU[14..0] 15 bslbf
|
|
* marker_bit 1 bslbf
|
|
* }
|
|
* for ( i=0;i<N;i++) {
|
|
* reserved 8 bslbf
|
|
* }
|
|
* }
|
|
* for (i=0;i<N;i++){
|
|
* stuffing_byte 8 bslbf
|
|
* }
|
|
* }
|
|
* }
|
|
*/
|
|
static gboolean
|
|
tsmux_write_adaptation_field (guint8 * buf,
|
|
TsMuxPacketInfo * pi, guint8 min_length, guint8 * written)
|
|
{
|
|
guint8 pos = 2;
|
|
guint8 flags = 0;
|
|
|
|
g_assert (min_length <= TSMUX_PAYLOAD_LENGTH);
|
|
|
|
/* Write out all the fields from the packet info only if the
|
|
* user set the flag to request the adaptation field - if the flag
|
|
* isn't set, we're just supposed to write stuffing bytes */
|
|
if (pi->flags & TSMUX_PACKET_FLAG_ADAPTATION) {
|
|
TS_DEBUG ("writing adaptation fields");
|
|
if (pi->flags & TSMUX_PACKET_FLAG_DISCONT)
|
|
flags |= 0x80;
|
|
if (pi->flags & TSMUX_PACKET_FLAG_RANDOM_ACCESS)
|
|
flags |= 0x40;
|
|
if (pi->flags & TSMUX_PACKET_FLAG_PRIORITY)
|
|
flags |= 0x20;
|
|
if (pi->flags & TSMUX_PACKET_FLAG_WRITE_PCR) {
|
|
guint64 pcr_base;
|
|
guint32 pcr_ext;
|
|
|
|
pcr_base = (pi->pcr / 300);
|
|
pcr_ext = (pi->pcr % 300);
|
|
|
|
flags |= 0x10;
|
|
TS_DEBUG ("Writing PCR %" G_GUINT64_FORMAT " + ext %u", pcr_base,
|
|
pcr_ext);
|
|
buf[pos++] = (pcr_base >> 25) & 0xff;
|
|
buf[pos++] = (pcr_base >> 17) & 0xff;
|
|
buf[pos++] = (pcr_base >> 9) & 0xff;
|
|
buf[pos++] = (pcr_base >> 1) & 0xff;
|
|
buf[pos++] = ((pcr_base << 7) & 0x80) | ((pcr_ext >> 8) & 0x01);
|
|
buf[pos++] = (pcr_ext) & 0xff;
|
|
}
|
|
if (pi->flags & TSMUX_PACKET_FLAG_WRITE_OPCR) {
|
|
guint64 opcr_base;
|
|
guint32 opcr_ext;
|
|
|
|
opcr_base = (pi->opcr / 300);
|
|
opcr_ext = (pi->opcr % 300);
|
|
|
|
flags |= 0x08;
|
|
TS_DEBUG ("Writing OPCR");
|
|
buf[pos++] = (opcr_base >> 25) & 0xff;
|
|
buf[pos++] = (opcr_base >> 17) & 0xff;
|
|
buf[pos++] = (opcr_base >> 9) & 0xff;
|
|
buf[pos++] = (opcr_base >> 1) & 0xff;
|
|
buf[pos++] = ((opcr_base << 7) & 0x80) | ((opcr_ext >> 8) & 0x01);
|
|
buf[pos++] = (opcr_ext) & 0xff;
|
|
}
|
|
if (pi->flags & TSMUX_PACKET_FLAG_WRITE_SPLICE) {
|
|
flags |= 0x04;
|
|
buf[pos++] = pi->splice_countdown;
|
|
}
|
|
if (pi->private_data_len > 0) {
|
|
flags |= 0x02;
|
|
/* Private data to write, ensure we have enough room */
|
|
if ((1 + pi->private_data_len) > (TSMUX_PAYLOAD_LENGTH - pos))
|
|
return FALSE;
|
|
buf[pos++] = pi->private_data_len;
|
|
memcpy (&(buf[pos]), pi->private_data, pi->private_data_len);
|
|
pos += pi->private_data_len;
|
|
TS_DEBUG ("%u bytes of private data", pi->private_data_len);
|
|
}
|
|
if (pi->flags & TSMUX_PACKET_FLAG_WRITE_ADAPT_EXT) {
|
|
flags |= 0x01;
|
|
TS_DEBUG ("FIXME: write Adaptation extension");
|
|
/* Write an empty extension for now */
|
|
buf[pos++] = 1;
|
|
buf[pos++] = 0;
|
|
}
|
|
}
|
|
/* Write the flags at the start */
|
|
buf[1] = flags;
|
|
|
|
/* Stuffing bytes if needed */
|
|
while (pos < min_length)
|
|
buf[pos++] = 0xff;
|
|
|
|
/* Write the adaptation field length, which doesn't include its own byte */
|
|
buf[0] = pos - 1;
|
|
|
|
if (written)
|
|
*written = pos;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
tsmux_write_ts_header (guint8 * buf, TsMuxPacketInfo * pi,
|
|
guint * payload_len_out, guint * payload_offset_out)
|
|
{
|
|
guint8 *tmp;
|
|
guint8 adaptation_flag;
|
|
guint8 adapt_min_length = 0;
|
|
guint8 adapt_len = 0;
|
|
guint payload_len;
|
|
gboolean write_adapt = FALSE;
|
|
|
|
/* Sync byte */
|
|
buf[0] = TSMUX_SYNC_BYTE;
|
|
|
|
TS_DEBUG ("PID 0x%04x, counter = 0x%01x, %u bytes avail", pi->pid,
|
|
pi->packet_count & 0x0f, pi->stream_avail);
|
|
|
|
/* 3 bits:
|
|
* transport_error_indicator
|
|
* payload_unit_start_indicator
|
|
* transport_priority: (00)
|
|
* 13 bits: PID
|
|
*/
|
|
tmp = buf + 1;
|
|
if (pi->packet_start_unit_indicator) {
|
|
tsmux_put16 (&tmp, 0x4000 | pi->pid);
|
|
} else
|
|
tsmux_put16 (&tmp, pi->pid);
|
|
|
|
/* 2 bits: scrambling_control (NOT SUPPORTED) (00)
|
|
* 2 bits: adaptation field control (1x has_adaptation_field | x1 has_payload)
|
|
* 4 bits: continuity counter (xxxx)
|
|
*/
|
|
adaptation_flag = pi->packet_count & 0x0f;
|
|
|
|
if (pi->flags & TSMUX_PACKET_FLAG_ADAPTATION) {
|
|
write_adapt = TRUE;
|
|
}
|
|
|
|
if (pi->stream_avail < TSMUX_PAYLOAD_LENGTH) {
|
|
/* Need an adaptation field regardless for stuffing */
|
|
adapt_min_length = TSMUX_PAYLOAD_LENGTH - pi->stream_avail;
|
|
write_adapt = TRUE;
|
|
}
|
|
|
|
if (write_adapt) {
|
|
gboolean res;
|
|
|
|
/* Flag the adaptation field presence */
|
|
adaptation_flag |= 0x20;
|
|
res = tsmux_write_adaptation_field (buf + TSMUX_HEADER_LENGTH,
|
|
pi, adapt_min_length, &adapt_len);
|
|
if (G_UNLIKELY (res == FALSE))
|
|
return FALSE;
|
|
|
|
/* Should have written at least the number of bytes we requested */
|
|
g_assert (adapt_len >= adapt_min_length);
|
|
}
|
|
|
|
/* The amount of packet data we wrote is the remaining space after
|
|
* the adaptation field */
|
|
*payload_len_out = payload_len = TSMUX_PAYLOAD_LENGTH - adapt_len;
|
|
*payload_offset_out = TSMUX_HEADER_LENGTH + adapt_len;
|
|
|
|
/* Now if we are going to write out some payload, flag that fact */
|
|
if (payload_len > 0 && pi->stream_avail > 0) {
|
|
/* Flag the presence of a payload */
|
|
adaptation_flag |= 0x10;
|
|
|
|
/* We must have enough data to fill the payload, or some calculation
|
|
* went wrong */
|
|
g_assert (payload_len <= pi->stream_avail);
|
|
|
|
/* Packet with payload, increment the continuity counter */
|
|
pi->packet_count++;
|
|
}
|
|
|
|
/* Write the byte of transport_scrambling_control, adaptation_field_control
|
|
* + continuity counter out */
|
|
buf[3] = adaptation_flag;
|
|
|
|
|
|
if (write_adapt) {
|
|
TS_DEBUG ("Adaptation field of size >= %d + %d bytes payload",
|
|
adapt_len, payload_len);
|
|
} else {
|
|
TS_DEBUG ("Payload of %d bytes only", payload_len);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* tsmux_write_stream_packet:
|
|
* @mux: a #TsMux
|
|
* @stream: a #TsMuxStream
|
|
*
|
|
* Write a packet of @stream.
|
|
*
|
|
* Returns: TRUE if the packet could be written.
|
|
*/
|
|
gboolean
|
|
tsmux_write_stream_packet (TsMux * mux, TsMuxStream * stream)
|
|
{
|
|
guint payload_len, payload_offs;
|
|
TsMuxPacketInfo *pi = &stream->pi;
|
|
gboolean res;
|
|
gint64 cur_pcr = -1;
|
|
GstBuffer *buf = NULL;
|
|
GstMapInfo map;
|
|
|
|
g_return_val_if_fail (mux != NULL, FALSE);
|
|
g_return_val_if_fail (stream != NULL, FALSE);
|
|
|
|
if (tsmux_stream_is_pcr (stream)) {
|
|
gint64 cur_pts = tsmux_stream_get_pts (stream);
|
|
gboolean write_pat;
|
|
GList *cur;
|
|
|
|
cur_pcr = 0;
|
|
if (cur_pts != -1) {
|
|
TS_DEBUG ("TS for PCR stream is %" G_GINT64_FORMAT, cur_pts);
|
|
}
|
|
|
|
/* FIXME: The current PCR needs more careful calculation than just
|
|
* writing a fixed offset */
|
|
if (cur_pts != -1) {
|
|
/* CLOCK_BASE >= TSMUX_PCR_OFFSET */
|
|
cur_pts += CLOCK_BASE;
|
|
cur_pcr = (cur_pts - TSMUX_PCR_OFFSET) *
|
|
(TSMUX_SYS_CLOCK_FREQ / TSMUX_CLOCK_FREQ);
|
|
}
|
|
|
|
/* Need to decide whether to write a new PCR in this packet */
|
|
if (stream->last_pcr == -1 ||
|
|
(cur_pcr - stream->last_pcr >
|
|
(TSMUX_SYS_CLOCK_FREQ / TSMUX_DEFAULT_PCR_FREQ))) {
|
|
|
|
stream->pi.flags |=
|
|
TSMUX_PACKET_FLAG_ADAPTATION | TSMUX_PACKET_FLAG_WRITE_PCR;
|
|
stream->pi.pcr = cur_pcr;
|
|
stream->last_pcr = cur_pcr;
|
|
} else {
|
|
cur_pcr = -1;
|
|
}
|
|
|
|
/* check if we need to rewrite pat */
|
|
if (mux->last_pat_ts == -1 || mux->pat_changed)
|
|
write_pat = TRUE;
|
|
else if (cur_pts >= mux->last_pat_ts + mux->pat_interval)
|
|
write_pat = TRUE;
|
|
else
|
|
write_pat = FALSE;
|
|
|
|
if (write_pat) {
|
|
mux->last_pat_ts = cur_pts;
|
|
if (!tsmux_write_pat (mux))
|
|
return FALSE;
|
|
}
|
|
|
|
/* check if we need to rewrite any of the current pmts */
|
|
for (cur = mux->programs; cur; cur = cur->next) {
|
|
TsMuxProgram *program = (TsMuxProgram *) cur->data;
|
|
gboolean write_pmt;
|
|
|
|
if (program->last_pmt_ts == -1 || program->pmt_changed)
|
|
write_pmt = TRUE;
|
|
else if (cur_pts >= program->last_pmt_ts + program->pmt_interval)
|
|
write_pmt = TRUE;
|
|
else
|
|
write_pmt = FALSE;
|
|
|
|
if (write_pmt) {
|
|
program->last_pmt_ts = cur_pts;
|
|
if (!tsmux_write_pmt (mux, program))
|
|
return FALSE;
|
|
}
|
|
}
|
|
}
|
|
|
|
pi->packet_start_unit_indicator = tsmux_stream_at_pes_start (stream);
|
|
if (pi->packet_start_unit_indicator) {
|
|
tsmux_stream_initialize_pes_packet (stream);
|
|
if (stream->dts != -1)
|
|
stream->dts += CLOCK_BASE;
|
|
if (stream->pts != -1)
|
|
stream->pts += CLOCK_BASE;
|
|
}
|
|
pi->stream_avail = tsmux_stream_bytes_avail (stream);
|
|
|
|
/* obtain buffer */
|
|
if (!tsmux_get_buffer (mux, &buf))
|
|
return FALSE;
|
|
|
|
gst_buffer_map (buf, &map, GST_MAP_READ);
|
|
|
|
if (!tsmux_write_ts_header (map.data, pi, &payload_len, &payload_offs))
|
|
goto fail;
|
|
|
|
|
|
if (!tsmux_stream_get_data (stream, map.data + payload_offs, payload_len))
|
|
goto fail;
|
|
|
|
gst_buffer_unmap (buf, &map);
|
|
|
|
res = tsmux_packet_out (mux, buf, cur_pcr);
|
|
|
|
/* Reset all dynamic flags */
|
|
stream->pi.flags &= TSMUX_PACKET_FLAG_PES_FULL_HEADER;
|
|
|
|
return res;
|
|
|
|
/* ERRORS */
|
|
fail:
|
|
{
|
|
gst_buffer_unmap (buf, &map);
|
|
if (buf)
|
|
gst_buffer_unref (buf);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tsmux_program_free:
|
|
* @program: a #TsMuxProgram
|
|
*
|
|
* Free the resources of @program. After this call @program can not be used
|
|
* anymore.
|
|
*/
|
|
void
|
|
tsmux_program_free (TsMuxProgram * program)
|
|
{
|
|
g_return_if_fail (program != NULL);
|
|
|
|
g_array_free (program->streams, TRUE);
|
|
g_slice_free (TsMuxProgram, program);
|
|
}
|
|
|
|
static gboolean
|
|
tsmux_write_section (TsMux * mux, TsMuxSection * section)
|
|
{
|
|
guint8 *cur_in;
|
|
guint payload_remain;
|
|
guint payload_len, payload_offs;
|
|
TsMuxPacketInfo *pi;
|
|
GstBuffer *buf = NULL;
|
|
GstMapInfo map;
|
|
|
|
pi = §ion->pi;
|
|
|
|
pi->packet_start_unit_indicator = TRUE;
|
|
|
|
cur_in = section->data;
|
|
payload_remain = pi->stream_avail;
|
|
|
|
while (payload_remain > 0) {
|
|
|
|
/* obtain buffer */
|
|
map.data = NULL;
|
|
if (!tsmux_get_buffer (mux, &buf))
|
|
goto fail;
|
|
|
|
gst_buffer_map (buf, &map, GST_MAP_WRITE);
|
|
|
|
if (pi->packet_start_unit_indicator) {
|
|
/* Need to write an extra single byte start pointer */
|
|
pi->stream_avail++;
|
|
|
|
if (!tsmux_write_ts_header (map.data, pi, &payload_len, &payload_offs)) {
|
|
pi->stream_avail--;
|
|
goto fail;
|
|
}
|
|
pi->stream_avail--;
|
|
|
|
/* Write the pointer byte */
|
|
map.data[payload_offs] = 0x00;
|
|
|
|
payload_offs++;
|
|
payload_len--;
|
|
pi->packet_start_unit_indicator = FALSE;
|
|
} else {
|
|
if (!tsmux_write_ts_header (map.data, pi, &payload_len, &payload_offs))
|
|
goto fail;
|
|
}
|
|
|
|
TS_DEBUG ("Outputting %d bytes to section. %d remaining after",
|
|
payload_len, payload_remain - payload_len);
|
|
|
|
memcpy (map.data + payload_offs, cur_in, payload_len);
|
|
|
|
cur_in += payload_len;
|
|
payload_remain -= payload_len;
|
|
|
|
gst_buffer_unmap (buf, &map);
|
|
|
|
/* we do not write PCR in section */
|
|
if (G_UNLIKELY (!tsmux_packet_out (mux, buf, -1))) {
|
|
/* buffer given away */
|
|
buf = NULL;
|
|
goto fail;
|
|
}
|
|
buf = NULL;
|
|
}
|
|
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
fail:
|
|
{
|
|
if (map.data && buf)
|
|
gst_buffer_unmap (buf, &map);
|
|
if (buf)
|
|
gst_buffer_unref (buf);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static void
|
|
tsmux_write_section_hdr (guint8 * pos, guint8 table_id, guint16 len,
|
|
guint16 id, guint8 version, guint8 section_nr, guint8 last_section_nr)
|
|
{
|
|
/* The length passed is the total length of the section, but we're not
|
|
* supposed to include the first 3 bytes of the header in the count */
|
|
len -= 3;
|
|
|
|
/* 1 byte table identifier */
|
|
*pos++ = table_id;
|
|
/* section_syntax_indicator = '0' | '0' | '11' reserved bits | (len >> 8) */
|
|
tsmux_put16 (&pos, 0xB000 | len);
|
|
/* 2 bytes transport/program id */
|
|
tsmux_put16 (&pos, id);
|
|
|
|
/* '11' reserved | version 'xxxxxx' | 'x' current_next */
|
|
*pos++ = 0xC0 | ((version & 0x1F) << 1) | 0x01;
|
|
*pos++ = section_nr;
|
|
*pos++ = last_section_nr;
|
|
}
|
|
|
|
static gboolean
|
|
tsmux_write_pat (TsMux * mux)
|
|
{
|
|
GList *cur;
|
|
TsMuxSection *pat = &mux->pat;
|
|
|
|
if (mux->pat_changed) {
|
|
/* program_association_section ()
|
|
* table_id 8 uimsbf
|
|
* section_syntax_indicator 1 bslbf
|
|
* '0' 1 bslbf
|
|
* reserved 2 bslbf
|
|
* section_length 12 uimsbf
|
|
* transport_stream_id 16 uimsbf
|
|
* reserved 2 bslbf
|
|
* version_number 5 uimsbf
|
|
* current_next_indicator 1 bslbf
|
|
* section_number 8 uimsbf
|
|
* last_section_number 8 uimsbf
|
|
* for (i = 0; i < N; i++) {
|
|
* program_number 16 uimsbf
|
|
* reserved 3 bslbf
|
|
* network_PID_or_program_map_PID 13 uimbsf
|
|
* }
|
|
* CRC_32 32 rbchof
|
|
*/
|
|
guint8 *pos;
|
|
guint32 crc;
|
|
|
|
/* Prepare the section data after the section header */
|
|
pos = pat->data + TSMUX_SECTION_HDR_SIZE;
|
|
|
|
for (cur = mux->programs; cur; cur = cur->next) {
|
|
TsMuxProgram *program = (TsMuxProgram *) cur->data;
|
|
|
|
tsmux_put16 (&pos, program->pgm_number);
|
|
tsmux_put16 (&pos, 0xE000 | program->pmt_pid);
|
|
}
|
|
|
|
/* Measure the section length, include extra 4 bytes for CRC below */
|
|
pat->pi.stream_avail = pos - pat->data + 4;
|
|
|
|
/* Go back and write the header now that we know the final length.
|
|
* table_id = 0 for PAT */
|
|
tsmux_write_section_hdr (pat->data, 0x00, pat->pi.stream_avail,
|
|
mux->transport_id, mux->pat_version, 0, 0);
|
|
|
|
/* Calc and output CRC for data bytes, not including itself */
|
|
crc = calc_crc32 (pat->data, pat->pi.stream_avail - 4);
|
|
tsmux_put32 (&pos, crc);
|
|
|
|
TS_DEBUG ("PAT has %d programs, is %u bytes",
|
|
mux->nb_programs, pat->pi.stream_avail);
|
|
mux->pat_changed = FALSE;
|
|
mux->pat_version++;
|
|
}
|
|
|
|
return tsmux_write_section (mux, pat);
|
|
}
|
|
|
|
static gboolean
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tsmux_write_pmt (TsMux * mux, TsMuxProgram * program)
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{
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TsMuxSection *pmt = &program->pmt;
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if (program->pmt_changed) {
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/* program_association_section ()
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* table_id 8 uimsbf
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* section_syntax_indicator 1 bslbf
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* '0' 1 bslbf
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* reserved 2 bslbf
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* section_length 12 uimsbf
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* program_id 16 uimsbf
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* reserved 2 bslbf
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* version_number 5 uimsbf
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* current_next_indicator 1 bslbf
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* section_number 8 uimsbf
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* last_section_number 8 uimsbf
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* reserved 3 bslbf
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* PCR_PID 13 uimsbf
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* reserved 4 bslbf
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* program_info_length 12 uimsbf
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* for (i = 0; i < N; i++)
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* descriptor ()
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*
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* for (i = 0; i < N1; i++) {
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* stream_type 8 uimsbf
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* reserved 3 bslbf
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* elementary_PID 13 uimbsf
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* reserved 4 bslbf
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* ES_info_length 12 uimbsf
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* for (i = 0; i < N1; i++) {
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* descriptor ();
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* }
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* }
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* CRC_32 32 rbchof
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*/
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guint8 *pos;
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guint32 crc;
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guint i;
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/* Prepare the section data after the basic section header */
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pos = pmt->data + TSMUX_SECTION_HDR_SIZE;
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if (program->pcr_stream == NULL)
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tsmux_put16 (&pos, 0xFFFF);
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else
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tsmux_put16 (&pos, 0xE000 | tsmux_stream_get_pid (program->pcr_stream));
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/* 4 bits reserved, 12 bits program_info_length, descriptor : HDMV */
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tsmux_put16 (&pos, 0xF00C);
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tsmux_put16 (&pos, 0x0504);
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tsmux_put16 (&pos, 0x4844);
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tsmux_put16 (&pos, 0x4D56);
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tsmux_put16 (&pos, 0x8804);
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tsmux_put16 (&pos, 0x0FFF);
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tsmux_put16 (&pos, 0xFCFC);
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/* Write out the entries */
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for (i = 0; i < program->streams->len; i++) {
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TsMuxStream *stream = g_array_index (program->streams, TsMuxStream *, i);
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guint16 es_info_len;
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/* FIXME: Use API to retrieve this from the stream */
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*pos++ = stream->stream_type;
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tsmux_put16 (&pos, 0xE000 | tsmux_stream_get_pid (stream));
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/* Write any ES descriptors needed */
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tsmux_stream_get_es_descrs (stream, mux->es_info_buf, &es_info_len);
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tsmux_put16 (&pos, 0xF000 | es_info_len);
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if (es_info_len > 0) {
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TS_DEBUG ("Writing descriptor of len %d for PID 0x%04x",
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es_info_len, tsmux_stream_get_pid (stream));
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if (G_UNLIKELY (pos + es_info_len >=
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pmt->data + TSMUX_MAX_SECTION_LENGTH))
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return FALSE;
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memcpy (pos, mux->es_info_buf, es_info_len);
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pos += es_info_len;
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}
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}
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/* Include the CRC in the byte count */
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pmt->pi.stream_avail = pos - pmt->data + 4;
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/* Go back and patch the pmt_header now that we know the length.
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* table_id = 2 for PMT */
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tsmux_write_section_hdr (pmt->data, 0x02, pmt->pi.stream_avail,
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program->pgm_number, program->pmt_version, 0, 0);
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/* Calc and output CRC for data bytes,
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* but not counting the CRC bytes this time */
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crc = calc_crc32 (pmt->data, pmt->pi.stream_avail - 4);
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tsmux_put32 (&pos, crc);
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TS_DEBUG ("PMT for program %d has %d streams, is %u bytes",
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program->pgm_number, program->streams->len, pmt->pi.stream_avail);
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pmt->pi.pid = program->pmt_pid;
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program->pmt_changed = FALSE;
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program->pmt_version++;
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}
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return tsmux_write_section (mux, pmt);
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}
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