/* * Copyright 2006, 2007, 2008, 2009, 2010 Fluendo S.A. * Authors: Jan Schmidt * Kapil Agrawal * Julien Moutte * * Copyright (C) 2011 Jan Schmidt * * This library is licensed under 3 different licenses and you * can choose to use it under the terms of any one of them. The * three licenses are the MPL 1.1, the LGPL and the MIT license. * * MPL: * * The contents of this file are subject to the Mozilla Public License * Version 1.1 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/. * * Software distributed under the License is distributed on an "AS IS" * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the * License for the specific language governing rights and limitations * under the License. * * LGPL: * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. * * MIT: * * Unless otherwise indicated, Source Code is licensed under MIT license. * See further explanation attached in License Statement (distributed in the file * LICENSE). * * Permission is hereby granted, free of charge, to any person obtaining a copy of * this software and associated documentation files (the "Software"), to deal in * the Software without restriction, including without limitation the rights to * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies * of the Software, and to permit persons to whom the Software is furnished to do * so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * SPDX-License-Identifier: MPL-1.1 OR MIT OR LGPL-2.0-or-later */ /** * SECTION: element-mpegtsmux * @title: MPEG Transport Stream muxer * * mpegtsmux muxes different streams into an MPEG Transport stream * * SI sections can be specified through a custom event: * * {{ tests/examples/mpegts/ts-section-writer.c }} */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gstmpegtsmux.h" #include #define MPEGTSMUX_DEFAULT_M2TS FALSE #define M2TS_PACKET_LENGTH 192 enum { PROP_0, PROP_M2TS_MODE, }; static GstStaticPadTemplate gst_mpeg_ts_mux_sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%d", GST_PAD_SINK, GST_PAD_REQUEST, GST_STATIC_CAPS ("video/mpeg, " "parsed = (boolean) TRUE, " "mpegversion = (int) { 1, 2, 4 }, " "systemstream = (boolean) false; " "video/x-dirac;" "image/x-jpc, alignment = (string) frame;" "video/x-h264,stream-format=(string)byte-stream," "alignment=(string){au, nal}; " "video/x-h265,stream-format=(string)byte-stream," "alignment=(string){au, nal}; " "audio/mpeg, " "parsed = (boolean) TRUE, " "mpegversion = (int) 1;" "audio/mpeg, " "framed = (boolean) TRUE, " "mpegversion = (int) {2, 4}, stream-format = (string) { adts, raw };" "audio/x-lpcm, " "width = (int) { 16, 20, 24 }, " "rate = (int) { 48000, 96000 }, " "channels = (int) [ 1, 8 ], " "dynamic_range = (int) [ 0, 255 ], " "emphasis = (boolean) { FALSE, TRUE }, " "mute = (boolean) { FALSE, TRUE }; " "audio/x-ac3, framed = (boolean) TRUE;" "audio/x-dts, framed = (boolean) TRUE;" "audio/x-opus, " "channels = (int) [1, 255];" "subpicture/x-dvb; application/x-teletext; meta/x-klv, parsed=true;" "meta/x-id3, parsed=true;" "meta/x-st-2038, alignment = (string) line;" "image/x-jpc, alignment = (string) frame, profile = (int)[0, 49151];" "image/x-jxsc, alignment = (string) frame, sampling = { YCbCr-4:2:2, YCbCr-4:4:4 };")); static GstStaticPadTemplate gst_mpeg_ts_mux_src_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/mpegts, " "systemstream = (boolean) true, " "packetsize = (int) { 188, 192} ") ); GST_DEBUG_CATEGORY (gst_mpeg_ts_mux_debug); #define GST_CAT_DEFAULT gst_mpeg_ts_mux_debug #define parent_class gst_mpeg_ts_mux_parent_class G_DEFINE_TYPE (GstMpegTsMux, gst_mpeg_ts_mux, GST_TYPE_BASE_TS_MUX); GST_ELEMENT_REGISTER_DEFINE (mpegtsmux, "mpegtsmux", GST_RANK_PRIMARY, gst_mpeg_ts_mux_get_type ()); /* Internals */ static gboolean new_packet_m2ts (GstMpegTsMux * mux, GstBuffer * buf, gint64 new_pcr) { GstBuffer *out_buf; int chunk_bytes; GstMapInfo map; GST_LOG_OBJECT (mux, "Have buffer %p with new_pcr=%" G_GINT64_FORMAT, buf, new_pcr); chunk_bytes = gst_adapter_available (mux->adapter); if (G_LIKELY (buf)) { if (new_pcr < 0) { /* If there is no pcr in current ts packet then just add the packet to the adapter for later output when we see a PCR */ GST_LOG_OBJECT (mux, "Accumulating non-PCR packet"); gst_adapter_push (mux->adapter, buf); goto exit; } /* no first interpolation point yet, then this is the one, * otherwise it is the second interpolation point */ if (mux->previous_pcr < 0 && chunk_bytes) { mux->previous_pcr = new_pcr; mux->previous_offset = chunk_bytes; GST_LOG_OBJECT (mux, "Accumulating non-PCR packet"); gst_adapter_push (mux->adapter, buf); goto exit; } } else { g_assert (new_pcr == -1); } /* interpolate if needed, and 2 points available */ if (chunk_bytes && (new_pcr != mux->previous_pcr)) { gint64 offset = 0; GST_LOG_OBJECT (mux, "Processing pending packets; " "previous pcr %" G_GINT64_FORMAT ", previous offset %d, " "current pcr %" G_GINT64_FORMAT ", current offset %d", mux->previous_pcr, (gint) mux->previous_offset, new_pcr, (gint) chunk_bytes); g_assert (chunk_bytes > mux->previous_offset); /* if draining, use previous rate */ if (G_LIKELY (new_pcr > 0)) { mux->pcr_rate_num = new_pcr - mux->previous_pcr; mux->pcr_rate_den = chunk_bytes - mux->previous_offset; } while (offset < chunk_bytes) { guint64 cur_pcr, ts; /* Loop, pulling packets of the adapter, updating their 4 byte * timestamp header and pushing */ /* interpolate PCR */ if (G_LIKELY (offset >= mux->previous_offset)) cur_pcr = mux->previous_pcr + gst_util_uint64_scale (offset - mux->previous_offset, mux->pcr_rate_num, mux->pcr_rate_den); else cur_pcr = mux->previous_pcr - gst_util_uint64_scale (mux->previous_offset - offset, mux->pcr_rate_num, mux->pcr_rate_den); /* FIXME: what about DTS here? */ ts = gst_adapter_prev_pts (mux->adapter, NULL); out_buf = gst_adapter_take_buffer (mux->adapter, M2TS_PACKET_LENGTH); g_assert (out_buf); offset += M2TS_PACKET_LENGTH; GST_BUFFER_PTS (out_buf) = ts; gst_buffer_map (out_buf, &map, GST_MAP_WRITE); /* The header is the bottom 30 bits of the PCR, apparently not * encoded into base + ext as in the packets themselves */ GST_WRITE_UINT32_BE (map.data, cur_pcr & 0x3FFFFFFF); gst_buffer_unmap (out_buf, &map); GST_LOG_OBJECT (mux, "Outputting a packet of length %d PCR %" G_GUINT64_FORMAT, M2TS_PACKET_LENGTH, cur_pcr); ((GstBaseTsMuxClass *) parent_class)->output_packet (GST_BASE_TS_MUX (mux), out_buf, -1); } } if (G_UNLIKELY (!buf)) goto exit; gst_buffer_map (buf, &map, GST_MAP_WRITE); /* Finally, output the passed in packet */ /* Only write the bottom 30 bits of the PCR */ GST_WRITE_UINT32_BE (map.data, new_pcr & 0x3FFFFFFF); gst_buffer_unmap (buf, &map); GST_LOG_OBJECT (mux, "Outputting a packet of length %d PCR %" G_GUINT64_FORMAT, M2TS_PACKET_LENGTH, new_pcr); ((GstBaseTsMuxClass *) parent_class)->output_packet (GST_BASE_TS_MUX (mux), buf, -1); if (new_pcr != mux->previous_pcr) { mux->previous_pcr = new_pcr; mux->previous_offset = -M2TS_PACKET_LENGTH; } exit: return TRUE; } /* GstBaseTsMux implementation */ static void gst_mpeg_ts_mux_allocate_packet (GstBaseTsMux * mux, GstBuffer ** buffer) { ((GstBaseTsMuxClass *) parent_class)->allocate_packet (mux, buffer); gst_buffer_set_size (*buffer, GST_BASE_TS_MUX_NORMAL_PACKET_LENGTH); } static gboolean gst_mpeg_ts_mux_output_packet (GstBaseTsMux * base_tsmux, GstBuffer * buffer, gint64 new_pcr) { GstMpegTsMux *mux = GST_MPEG_TS_MUX (base_tsmux); GstMapInfo map; if (!mux->m2ts_mode) return ((GstBaseTsMuxClass *) parent_class)->output_packet (base_tsmux, buffer, new_pcr); gst_buffer_set_size (buffer, M2TS_PACKET_LENGTH); gst_buffer_map (buffer, &map, GST_MAP_READWRITE); /* there should be a better way to do this */ memmove (map.data + 4, map.data, map.size - 4); gst_buffer_unmap (buffer, &map); return new_packet_m2ts (mux, buffer, new_pcr); } static void gst_mpeg_ts_mux_reset (GstBaseTsMux * base_tsmux) { GstMpegTsMux *mux = GST_MPEG_TS_MUX (base_tsmux); if (mux->adapter) gst_adapter_clear (mux->adapter); mux->previous_pcr = -1; mux->previous_offset = 0; mux->pcr_rate_num = mux->pcr_rate_den = 1; } static gboolean gst_mpeg_ts_mux_drain (GstBaseTsMux * mux) { return new_packet_m2ts (GST_MPEG_TS_MUX (mux), NULL, -1); } /* GObject implementation */ static void gst_mpeg_ts_mux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstMpegTsMux *mux = GST_MPEG_TS_MUX (object); switch (prop_id) { case PROP_M2TS_MODE: /* set in case if the output stream need to be of 192 bytes */ mux->m2ts_mode = g_value_get_boolean (value); gst_base_ts_mux_set_packet_size (GST_BASE_TS_MUX (mux), mux->m2ts_mode ? M2TS_PACKET_LENGTH : GST_BASE_TS_MUX_NORMAL_PACKET_LENGTH); gst_base_ts_mux_set_automatic_alignment (GST_BASE_TS_MUX (mux), mux->m2ts_mode ? 32 : 0); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_mpeg_ts_mux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstMpegTsMux *mux = GST_MPEG_TS_MUX (object); switch (prop_id) { case PROP_M2TS_MODE: g_value_set_boolean (value, mux->m2ts_mode); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_mpeg_ts_mux_dispose (GObject * object) { GstMpegTsMux *mux = GST_MPEG_TS_MUX (object); if (mux->adapter) { g_object_unref (mux->adapter); mux->adapter = NULL; } GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object)); } static void gst_mpeg_ts_mux_class_init (GstMpegTsMuxClass * klass) { GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GstBaseTsMuxClass *base_tsmux_class = GST_BASE_TS_MUX_CLASS (klass); GST_DEBUG_CATEGORY_INIT (gst_mpeg_ts_mux_debug, "mpegtsmux", 0, "MPEG Transport Stream muxer"); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_get_property); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_dispose); base_tsmux_class->allocate_packet = GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_allocate_packet); base_tsmux_class->output_packet = GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_output_packet); base_tsmux_class->reset = GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_reset); base_tsmux_class->drain = GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_drain); gst_element_class_set_static_metadata (gstelement_class, "MPEG Transport Stream Muxer", "Codec/Muxer", "Multiplexes media streams into an MPEG Transport Stream", "Fluendo "); gst_element_class_add_static_pad_template_with_gtype (gstelement_class, &gst_mpeg_ts_mux_sink_factory, GST_TYPE_BASE_TS_MUX_PAD); gst_element_class_add_static_pad_template_with_gtype (gstelement_class, &gst_mpeg_ts_mux_src_factory, GST_TYPE_AGGREGATOR_PAD); g_object_class_install_property (gobject_class, PROP_M2TS_MODE, g_param_spec_boolean ("m2ts-mode", "M2TS(192 bytes) Mode", "Set to TRUE to output Blu-Ray disc format with 192 byte packets. " "FALSE for standard TS format with 188 byte packets.", MPEGTSMUX_DEFAULT_M2TS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); } static void gst_mpeg_ts_mux_init (GstMpegTsMux * mux) { mux->m2ts_mode = MPEGTSMUX_DEFAULT_M2TS; mux->adapter = gst_adapter_new (); }