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4299be47ab
`tsmux_stream_default_get_es_descrs` is missing the `user_data` parameter and shouldn't be cast to `TsMuxStreamGetESDescriptorsFunc`. Prefer not casting at all to make sure we don't miss such an issue. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5516>
220 lines
6.4 KiB
C
220 lines
6.4 KiB
C
/* ATSC Transport Stream muxer
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* Copyright (C) 2019 Mathieu Duponchelle <mathieu@centricular.com>
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*
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* atscmux.c:
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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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* SPDX-License-Identifier: LGPL-2.0-or-later
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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 "gstatscmux.h"
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GST_DEBUG_CATEGORY (gst_atsc_mux_debug);
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#define GST_CAT_DEFAULT gst_atsc_mux_debug
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G_DEFINE_TYPE (GstATSCMux, gst_atsc_mux, GST_TYPE_BASE_TS_MUX);
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GST_ELEMENT_REGISTER_DEFINE (atscmux, "atscmux", GST_RANK_PRIMARY,
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gst_atsc_mux_get_type ());
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#define parent_class gst_atsc_mux_parent_class
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#define ATSCMUX_ST_PS_AUDIO_EAC3 0x87
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static GstStaticPadTemplate gst_atsc_mux_src_factory =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/mpegts, "
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"systemstream = (boolean) true, " "packetsize = (int) 188 ")
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);
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static GstStaticPadTemplate gst_atsc_mux_sink_factory =
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GST_STATIC_PAD_TEMPLATE ("sink_%d",
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GST_PAD_SINK,
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GST_PAD_REQUEST,
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GST_STATIC_CAPS ("video/mpeg, "
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"parsed = (boolean) TRUE, "
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"mpegversion = (int) 2, "
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"systemstream = (boolean) false; "
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"video/x-h264,stream-format=(string)byte-stream,"
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"alignment=(string){au, nal}; "
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"audio/x-ac3, framed = (boolean) TRUE;"
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"audio/x-eac3, framed = (boolean) TRUE;"));
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/* Internals */
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static void
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gst_atsc_mux_stream_get_es_descrs (TsMuxStream * stream,
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GstMpegtsPMTStream * pmt_stream, gpointer user_data)
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{
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GstMpegtsDescriptor *descriptor;
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tsmux_stream_default_get_es_descrs (stream, pmt_stream);
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if (stream->stream_type == ATSCMUX_ST_PS_AUDIO_EAC3) {
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guint8 add_info[4];
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guint8 *pos;
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pos = add_info;
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/* audio_stream_descriptor () | ATSC A/52-2018 Annex G
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*
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* descriptor_tag 8 uimsbf
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* descriptor_length 8 uimsbf
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* reserved 1 '1'
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* bsid_flag 1 bslbf
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* mainid_flag 1 bslbf
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* asvc_flag 1 bslbf
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* mixinfoexists 1 bslbf
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* substream1_flag 1 bslbf
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* substream2_flag 1 bslbf
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* substream3_flag 1 bslbf
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* reserved 1 '1'
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* full_service_flag 1 bslbf
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* audio_service_type 3 uimsbf
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* number_of_channels 3 uimsbf
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* [...]
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*/
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*pos++ = 0xCC;
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*pos++ = 2;
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/* 1 bit reserved, all other flags unset */
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*pos++ = 0x80;
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/* 1 bit reserved,
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* 1 bit set for full_service_flag,
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* 3 bits hardcoded audio_service_type "Complete Main",
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* 3 bits number_of_channels
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*/
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switch (stream->audio_channels) {
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case 1:
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*pos++ = 0xC0; /* Mono */
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break;
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case 2:
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*pos++ = 0xC0 | 0x2; /* 2-channel (stereo) */
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break;
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case 3:
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case 4:
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case 5:
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*pos++ = 0xC0 | 0x4; /* Multichannel audio (> 2 channels; <= 3/2 + LFE channels) */
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break;
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case 6:
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default:
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*pos++ = 0xC0 | 0x5; /* Multichannel audio(> 3/2 + LFE channels) */
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}
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descriptor = gst_mpegts_descriptor_from_registration ("EAC3", add_info, 4);
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g_ptr_array_add (pmt_stream->descriptors, descriptor);
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descriptor =
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gst_mpegts_descriptor_from_custom (GST_MTS_DESC_ATSC_EAC3, add_info, 4);
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g_ptr_array_add (pmt_stream->descriptors, descriptor);
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}
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}
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static TsMuxStream *
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gst_atsc_mux_create_new_stream (guint16 new_pid, TsMuxStreamType stream_type,
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gpointer user_data)
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{
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TsMuxStream *ret = tsmux_stream_new (new_pid, stream_type);
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if (stream_type == ATSCMUX_ST_PS_AUDIO_EAC3) {
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ret->id = 0xBD;
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ret->pi.flags |= TSMUX_PACKET_FLAG_PES_FULL_HEADER;
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ret->is_audio = TRUE;
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} else if (stream_type == TSMUX_ST_PS_AUDIO_AC3) {
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ret->id = 0xBD;
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ret->id_extended = 0;
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}
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tsmux_stream_set_get_es_descriptors_func (ret,
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gst_atsc_mux_stream_get_es_descrs, user_data);
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return ret;
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}
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/* GstBaseTsMux implementation */
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static TsMux *
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gst_atsc_mux_create_ts_mux (GstBaseTsMux * mpegtsmux)
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{
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TsMux *ret = ((GstBaseTsMuxClass *) parent_class)->create_ts_mux (mpegtsmux);
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GstMpegtsAtscMGT *mgt;
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GstMpegtsAtscSTT *stt;
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GstMpegtsAtscRRT *rrt;
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GstMpegtsSection *section;
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mgt = gst_mpegts_atsc_mgt_new ();
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section = gst_mpegts_section_from_atsc_mgt (mgt);
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tsmux_add_mpegts_si_section (ret, section);
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stt = gst_mpegts_atsc_stt_new ();
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section = gst_mpegts_section_from_atsc_stt (stt);
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tsmux_add_mpegts_si_section (ret, section);
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rrt = gst_mpegts_atsc_rrt_new ();
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section = gst_mpegts_section_from_atsc_rrt (rrt);
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tsmux_add_mpegts_si_section (ret, section);
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tsmux_set_new_stream_func (ret, gst_atsc_mux_create_new_stream, mpegtsmux);
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return ret;
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}
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static guint
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gst_atsc_mux_handle_media_type (GstBaseTsMux * mux, const gchar * media_type,
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GstBaseTsMuxPad * pad)
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{
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guint ret = TSMUX_ST_RESERVED;
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if (!g_strcmp0 (media_type, "audio/x-eac3")) {
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ret = ATSCMUX_ST_PS_AUDIO_EAC3;
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}
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return ret;
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}
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static void
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gst_atsc_mux_class_init (GstATSCMuxClass * klass)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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GstBaseTsMuxClass *mpegtsmux_class = (GstBaseTsMuxClass *) klass;
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GST_DEBUG_CATEGORY_INIT (gst_atsc_mux_debug, "atscmux", 0, "ATSC muxer");
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gst_element_class_set_static_metadata (gstelement_class,
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"ATSC Transport Stream Muxer", "Codec/Muxer",
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"Multiplexes media streams into an ATSC-compliant Transport Stream",
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"Mathieu Duponchelle <mathieu@centricular.com>");
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mpegtsmux_class->create_ts_mux = gst_atsc_mux_create_ts_mux;
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mpegtsmux_class->handle_media_type = gst_atsc_mux_handle_media_type;
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gst_element_class_add_static_pad_template_with_gtype (gstelement_class,
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&gst_atsc_mux_sink_factory, GST_TYPE_BASE_TS_MUX_PAD);
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gst_element_class_add_static_pad_template_with_gtype (gstelement_class,
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&gst_atsc_mux_src_factory, GST_TYPE_AGGREGATOR_PAD);
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}
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static void
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gst_atsc_mux_init (GstATSCMux * mux)
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{
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}
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