/* * Copyright 2006, 2007, 2008 Fluendo S.A. * Authors: Jan Schmidt * Kapil Agrawal * Julien Moutte * * This library is licensed under 4 different licenses and you * can choose to use it under the terms of any one of them. The * four licenses are the MPL 1.1, the LGPL, the GPL 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. * * GPL: * * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "mpegtsmux.h" #include "mpegtsmux_h264.h" #include "mpegtsmux_aac.h" GST_DEBUG_CATEGORY (mpegtsmux_debug); #define GST_CAT_DEFAULT mpegtsmux_debug enum { ARG_0, ARG_M2TS_MODE }; static GstStaticPadTemplate mpegtsmux_sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%d", GST_PAD_SINK, GST_PAD_REQUEST, GST_STATIC_CAPS ("video/mpeg, " "mpegversion = (int) { 1, 2, 4 }, " "systemstream = (boolean) false; " "video/x-dirac;" "video/x-h264;" "audio/mpeg, " "mpegversion = (int) { 1, 2, 4 };" "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;" "audio/x-dts")); static GstStaticPadTemplate mpegtsmux_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} ") ); static void gst_mpegtsmux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_mpegtsmux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void mpegtsmux_dispose (GObject * object); static gboolean new_packet_cb (guint8 * data, guint len, void *user_data, gint64 new_pcr); static void release_buffer_cb (guint8 * data, void *user_data); static gboolean mpegtsdemux_prepare_srcpad (MpegTsMux * mux); static GstFlowReturn mpegtsmux_collected (GstCollectPads * pads, MpegTsMux * mux); static GstPad *mpegtsmux_request_new_pad (GstElement * element, GstPadTemplate * templ, const gchar * name); static void mpegtsmux_release_pad (GstElement * element, GstPad * pad); static GstStateChangeReturn mpegtsmux_change_state (GstElement * element, GstStateChange transition); GST_BOILERPLATE (MpegTsMux, mpegtsmux, GstElement, GST_TYPE_ELEMENT); static void mpegtsmux_base_init (gpointer g_class) { const GstElementDetails mpegtsmux_details = { "MPEG Transport Stream Muxer", "Codec/Muxer", "Multiplexes media streams into an MPEG Transport Stream", "Fluendo " }; GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&mpegtsmux_sink_factory)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&mpegtsmux_src_factory)); gst_element_class_set_details (element_class, &mpegtsmux_details); } static void mpegtsmux_class_init (MpegTsMuxClass * klass) { GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); GObjectClass *gobject_class = G_OBJECT_CLASS (klass); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_mpegtsmux_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_mpegtsmux_get_property); gobject_class->dispose = mpegtsmux_dispose; gstelement_class->request_new_pad = mpegtsmux_request_new_pad; gstelement_class->release_pad = mpegtsmux_release_pad; gstelement_class->change_state = mpegtsmux_change_state; g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_M2TS_MODE, g_param_spec_boolean ("m2ts_mode", "M2TS(192 bytes) Mode", "Defines what packet size to use, normal TS format ie .ts(188 bytes) " "or Blue-Ray disc ie .m2ts(192 bytes).", FALSE, G_PARAM_READWRITE)); } static void mpegtsmux_init (MpegTsMux * mux, MpegTsMuxClass * g_class) { mux->srcpad = gst_pad_new_from_template (gst_static_pad_template_get (&mpegtsmux_src_factory), "src"); gst_pad_use_fixed_caps (mux->srcpad); gst_element_add_pad (GST_ELEMENT (mux), mux->srcpad); mux->collect = gst_collect_pads_new (); gst_collect_pads_set_function (mux->collect, (GstCollectPadsFunction) GST_DEBUG_FUNCPTR (mpegtsmux_collected), mux); mux->tsmux = tsmux_new (); tsmux_set_write_func (mux->tsmux, new_packet_cb, mux); mux->program = tsmux_program_new (mux->tsmux); mux->first = TRUE; mux->last_flow_ret = GST_FLOW_OK; mux->adapter = gst_adapter_new (); mux->m2ts_mode = FALSE; mux->first_pcr = TRUE; mux->last_ts = 0; } static void mpegtsmux_dispose (GObject * object) { MpegTsMux *mux = GST_MPEG_TSMUX (object); if (mux->adapter) { gst_adapter_clear (mux->adapter); gst_object_unref (mux->adapter); mux->adapter = NULL; } if (mux->collect) { gst_object_unref (mux->collect); mux->collect = NULL; } if (mux->tsmux) { tsmux_free (mux->tsmux); mux->tsmux = NULL; } GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object)); } static void gst_mpegtsmux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { MpegTsMux *mux = GST_MPEG_TSMUX (object); switch (prop_id) { case ARG_M2TS_MODE: /*set incase if the output stream need to be of 192 bytes */ mux->m2ts_mode = g_value_get_boolean (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_mpegtsmux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { MpegTsMux *mux = GST_MPEG_TSMUX (object); switch (prop_id) { case ARG_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 release_buffer_cb (guint8 * data, void *user_data) { GstBuffer *buf = (GstBuffer *) user_data; gst_buffer_unref (buf); } static GstFlowReturn mpegtsmux_create_stream (MpegTsMux * mux, MpegTsPadData * ts_data, GstPad * pad) { GstFlowReturn ret = GST_FLOW_ERROR; GstCaps *caps = gst_pad_get_negotiated_caps (pad); GstStructure *s; if (caps == NULL) { GST_DEBUG_OBJECT (pad, "Sink pad caps were not set before pushing"); return GST_FLOW_NOT_NEGOTIATED; } s = gst_caps_get_structure (caps, 0); g_return_val_if_fail (s != NULL, FALSE); if (gst_structure_has_name (s, "video/x-dirac")) { GST_DEBUG_OBJECT (pad, "Creating Dirac stream with PID 0x%04x", ts_data->pid); ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_VIDEO_DIRAC, ts_data->pid); } else if (gst_structure_has_name (s, "audio/x-ac3")) { GST_DEBUG_OBJECT (pad, "Creating AC3 stream with PID 0x%04x", ts_data->pid); ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_PS_AUDIO_AC3, ts_data->pid); } else if (gst_structure_has_name (s, "audio/x-dts")) { GST_DEBUG_OBJECT (pad, "Creating DTS stream with PID 0x%04x", ts_data->pid); ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_PS_AUDIO_DTS, ts_data->pid); } else if (gst_structure_has_name (s, "audio/x-lpcm")) { GST_DEBUG_OBJECT (pad, "Creating LPCM stream with PID 0x%04x", ts_data->pid); ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_PS_AUDIO_LPCM, ts_data->pid); } else if (gst_structure_has_name (s, "video/x-h264")) { const GValue *value; GST_DEBUG_OBJECT (pad, "Creating H264 stream with PID 0x%04x", ts_data->pid); /* Codec data contains SPS/PPS which need to go in stream for valid ES */ value = gst_structure_get_value (s, "codec_data"); if (value) { ts_data->codec_data = gst_buffer_ref (gst_value_get_buffer (value)); GST_DEBUG_OBJECT (pad, "we have additional codec data (%d bytes)", GST_BUFFER_SIZE (ts_data->codec_data)); ts_data->prepare_func = mpegtsmux_prepare_h264; } else { ts_data->codec_data = NULL; } ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_VIDEO_H264, ts_data->pid); } else if (gst_structure_has_name (s, "audio/mpeg")) { gint mpegversion; if (!gst_structure_get_int (s, "mpegversion", &mpegversion)) { GST_ELEMENT_ERROR (pad, STREAM, FORMAT, ("Invalid data format presented"), ("Caps with type audio/mpeg did not have mpegversion")); goto beach; } switch (mpegversion) { case 1: GST_DEBUG_OBJECT (pad, "Creating MPEG Audio, version 1 stream with " "PID 0x%04x", ts_data->pid); ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_AUDIO_MPEG1, ts_data->pid); break; case 2: GST_DEBUG_OBJECT (pad, "Creating MPEG Audio, version 2 stream with " "PID 0x%04x", ts_data->pid); ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_AUDIO_MPEG2, ts_data->pid); break; case 4: { const GValue *value; /* Codec data contains SPS/PPS which need to go in stream for valid ES */ value = gst_structure_get_value (s, "codec_data"); if (value) { ts_data->codec_data = gst_buffer_ref (gst_value_get_buffer (value)); GST_DEBUG_OBJECT (pad, "we have additional codec data (%d bytes)", GST_BUFFER_SIZE (ts_data->codec_data)); ts_data->prepare_func = mpegtsmux_prepare_aac; } else { ts_data->codec_data = NULL; } GST_DEBUG_OBJECT (pad, "Creating MPEG Audio, version 4 stream with " "PID 0x%04x", ts_data->pid); ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_AUDIO_AAC, ts_data->pid); break; } default: GST_WARNING_OBJECT (pad, "unsupported mpegversion %d", mpegversion); goto beach; } } else if (gst_structure_has_name (s, "video/mpeg")) { gint mpegversion; if (!gst_structure_get_int (s, "mpegversion", &mpegversion)) { GST_ELEMENT_ERROR (mux, STREAM, FORMAT, ("Invalid data format presented"), ("Caps with type video/mpeg did not have mpegversion")); goto beach; } if (mpegversion == 1) { GST_DEBUG_OBJECT (pad, "Creating MPEG Video, version 1 stream with PID 0x%04x", ts_data->pid); ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_VIDEO_MPEG1, ts_data->pid); } else if (mpegversion == 2) { GST_DEBUG_OBJECT (pad, "Creating MPEG Video, version 2 stream with PID 0x%04x", ts_data->pid); ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_VIDEO_MPEG2, ts_data->pid); } else { GST_DEBUG_OBJECT (pad, "Creating MPEG Video, version 4 stream with PID 0x%04x", ts_data->pid); ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_VIDEO_MPEG4, ts_data->pid); } } if (ts_data->stream != NULL) { gst_structure_get_int (s, "rate", &ts_data->stream->audio_sampling); gst_structure_get_int (s, "channels", &ts_data->stream->audio_channels); gst_structure_get_int (s, "bitrate", &ts_data->stream->audio_bitrate); tsmux_stream_set_buffer_release_func (ts_data->stream, release_buffer_cb); tsmux_program_add_stream (mux->program, ts_data->stream); ret = GST_FLOW_OK; } beach: return ret; } static GstFlowReturn mpegtsmux_create_streams (MpegTsMux * mux) { GstFlowReturn ret = GST_FLOW_OK; GSList *walk = mux->collect->data; /* Create the streams */ while (walk) { GstCollectData *c_data = (GstCollectData *) walk->data; MpegTsPadData *ts_data = (MpegTsPadData *) walk->data; walk = g_slist_next (walk); if (ts_data->stream == NULL) { ret = mpegtsmux_create_stream (mux, ts_data, c_data->pad); if (ret != GST_FLOW_OK) goto no_stream; } } return GST_FLOW_OK; no_stream: GST_ELEMENT_ERROR (mux, STREAM, MUX, ("Could not create handler for stream"), (NULL)); return ret; } static MpegTsPadData * mpegtsmux_choose_best_stream (MpegTsMux * mux) { MpegTsPadData *best = NULL; GstCollectData *c_best = NULL; GSList *walk; for (walk = mux->collect->data; walk != NULL; walk = g_slist_next (walk)) { GstCollectData *c_data = (GstCollectData *) walk->data; MpegTsPadData *ts_data = (MpegTsPadData *) walk->data; if (ts_data->eos == FALSE) { if (ts_data->queued_buf == NULL) { GstBuffer *buf; ts_data->queued_buf = buf = gst_collect_pads_peek (mux->collect, c_data); if (buf != NULL) { if (ts_data->prepare_func) { buf = ts_data->prepare_func (buf, ts_data, mux); if (buf) { /* Take the prepared buffer instead */ gst_buffer_unref (ts_data->queued_buf); ts_data->queued_buf = buf; } else { /* If data preparation returned NULL, use unprepared one */ buf = ts_data->queued_buf; } } if (GST_BUFFER_TIMESTAMP (buf) != GST_CLOCK_TIME_NONE) { /* Ignore timestamps that go backward for now. FIXME: Handle all * incoming PTS */ if (ts_data->last_ts == GST_CLOCK_TIME_NONE || ts_data->last_ts < GST_BUFFER_TIMESTAMP (buf)) { ts_data->cur_ts = ts_data->last_ts = gst_segment_to_running_time (&c_data->segment, GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (buf)); } else { GST_DEBUG_OBJECT (mux, "Ignoring PTS that has gone backward"); } } else ts_data->cur_ts = GST_CLOCK_TIME_NONE; GST_DEBUG_OBJECT (mux, "Pulled buffer with ts %" GST_TIME_FORMAT " (uncorrected ts %" GST_TIME_FORMAT " %" G_GUINT64_FORMAT ") for PID 0x%04x", GST_TIME_ARGS (ts_data->cur_ts), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)), GST_BUFFER_TIMESTAMP (buf), ts_data->pid); /* Choose a stream we've never seen a timestamp for to ensure * we push enough buffers from it to reach a timestamp */ if (ts_data->last_ts == GST_CLOCK_TIME_NONE) { best = ts_data; c_best = c_data; } } else { ts_data->eos = TRUE; continue; } } /* If we don't yet have a best pad, take this one, otherwise take * whichever has the oldest timestamp */ if (best != NULL) { if (ts_data->last_ts != GST_CLOCK_TIME_NONE && best->last_ts != GST_CLOCK_TIME_NONE && ts_data->last_ts < best->last_ts) { best = ts_data; c_best = c_data; } } else { best = ts_data; c_best = c_data; } } } if (c_best) { gst_buffer_unref (gst_collect_pads_pop (mux->collect, c_best)); } return best; } #define COLLECT_DATA_PAD(collect_data) (((GstCollectData *)(collect_data))->pad) static GstFlowReturn mpegtsmux_collected (GstCollectPads * pads, MpegTsMux * mux) { GstFlowReturn ret = GST_FLOW_OK; MpegTsPadData *best = NULL; GST_DEBUG_OBJECT (mux, "Pads collected"); if (mux->first) { ret = mpegtsmux_create_streams (mux); if (G_UNLIKELY (ret != GST_FLOW_OK)) return ret; best = mpegtsmux_choose_best_stream (mux); if (mux->pcr_stream == NULL) { if (best) { /* Take the first data stream for the PCR */ GST_DEBUG_OBJECT (COLLECT_DATA_PAD (best), "Use stream as PCR"); mux->pcr_stream = best->stream; } } /* Set the chosen PCR stream */ g_return_val_if_fail (mux->pcr_stream != NULL, GST_FLOW_ERROR); tsmux_program_set_pcr_stream (mux->program, mux->pcr_stream); if (!mpegtsdemux_prepare_srcpad (mux)) { GST_DEBUG_OBJECT (mux, "Failed to send new segment"); goto new_seg_fail; } mux->first = FALSE; } else { best = mpegtsmux_choose_best_stream (mux); } if (best != NULL) { GstBuffer *buf = best->queued_buf; gint64 pts = -1; g_return_val_if_fail (buf != NULL, GST_FLOW_ERROR); GST_DEBUG_OBJECT (COLLECT_DATA_PAD (best), "Chose stream for output (PID: 0x%04x)", best->pid); if (GST_CLOCK_TIME_IS_VALID (best->cur_ts)) { pts = GSTTIME_TO_MPEGTIME (best->cur_ts); GST_DEBUG_OBJECT (mux, "Buffer has TS %" GST_TIME_FORMAT " pts %" G_GINT64_FORMAT, GST_TIME_ARGS (best->cur_ts), pts); } tsmux_stream_add_data (best->stream, GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf), buf, pts, -1); best->queued_buf = NULL; while (tsmux_stream_bytes_in_buffer (best->stream) > 0) { if (!tsmux_write_stream_packet (mux->tsmux, best->stream)) { GST_DEBUG_OBJECT (mux, "Failed to write data packet"); goto write_fail; } } if (mux->pcr_stream == best->stream) { mux->last_ts = best->last_ts; } } else { /* FIXME: Drain all remaining streams */ /* At EOS */ gst_pad_push_event (mux->srcpad, gst_event_new_eos ()); } return ret; new_seg_fail: return GST_FLOW_ERROR; write_fail: /* FIXME: Failed writing data for some reason. Should set appropriate error */ return mux->last_flow_ret; } static GstPad * mpegtsmux_request_new_pad (GstElement * element, GstPadTemplate * templ, const gchar * name) { MpegTsMux *mux = GST_MPEG_TSMUX (element); gint pid = -1; gchar *pad_name = NULL; GstPad *pad = NULL; MpegTsPadData *pad_data = NULL; if (name != NULL && sscanf (name, "sink_%d", &pid) == 1) { if (tsmux_find_stream (mux->tsmux, pid)) goto stream_exists; } else { pid = tsmux_get_new_pid (mux->tsmux); } pad_name = g_strdup_printf ("sink_%d", pid); pad = gst_pad_new_from_template (templ, pad_name); g_free (pad_name); pad_data = (MpegTsPadData *) gst_collect_pads_add_pad (mux->collect, pad, sizeof (MpegTsPadData)); if (pad_data == NULL) goto pad_failure; pad_data->pid = pid; pad_data->last_ts = GST_CLOCK_TIME_NONE; pad_data->codec_data = NULL; pad_data->prepare_func = NULL; if (G_UNLIKELY (!gst_element_add_pad (element, pad))) goto could_not_add; return pad; stream_exists: GST_ELEMENT_ERROR (element, STREAM, MUX, ("Duplicate PID requested"), (NULL)); return NULL; could_not_add: GST_ELEMENT_ERROR (element, STREAM, FAILED, ("Internal data stream error."), ("Could not add pad to element")); gst_collect_pads_remove_pad (mux->collect, pad); gst_object_unref (pad); return NULL; pad_failure: GST_ELEMENT_ERROR (element, STREAM, FAILED, ("Internal data stream error."), ("Could not add pad to collectpads")); gst_object_unref (pad); return NULL; } static void mpegtsmux_release_pad (GstElement * element, GstPad * pad) { MpegTsMux *mux = GST_MPEG_TSMUX (element); MpegTsPadData *pad_data = NULL; GST_DEBUG_OBJECT (mux, "Pad %" GST_PTR_FORMAT " being released", pad); /* Get the MpegTsPadData out of the pad */ GST_OBJECT_LOCK (pad); pad_data = (MpegTsPadData *) gst_pad_get_element_private (pad); if (G_LIKELY (pad_data)) { /* Free codec data reference if any */ if (pad_data->codec_data) { GST_DEBUG_OBJECT (element, "releasing codec_data reference"); gst_buffer_unref (pad_data->codec_data); pad_data->codec_data = NULL; } } GST_OBJECT_UNLOCK (pad); gst_collect_pads_remove_pad (mux->collect, pad); } static gboolean new_packet_cb (guint8 * data, guint len, void *user_data, gint64 new_pcr) { /* Called when the TsMux has prepared a packet for output. Return FALSE * on error */ MpegTsMux *mux = (MpegTsMux *) user_data; GstBuffer *buf, *out_buf; GstFlowReturn ret; gfloat current_ts; gint64 m2ts_pcr, pcr_bytes, chunk_bytes; gint8 *temp_ptr; gint64 ts_rate; if (mux->m2ts_mode == TRUE) { /* Enters when the m2ts-mode is set true */ buf = gst_buffer_new_and_alloc (M2TS_PACKET_LENGTH); if (G_UNLIKELY (buf == NULL)) { mux->last_flow_ret = GST_FLOW_ERROR; return FALSE; } gst_buffer_set_caps (buf, GST_PAD_CAPS (mux->srcpad)); /* copies the ts data of 188 bytes to the m2ts buffer at an offset of 4 bytes of timestamp */ memcpy (GST_BUFFER_DATA (buf) + 4, data, len); if (new_pcr >= 0) { /*when there is a pcr value in ts data */ pcr_bytes = 0; if (mux->first_pcr) { /*Incase of first pcr */ /*writing the 4 byte timestamp value */ GST_WRITE_UINT32_BE (GST_BUFFER_DATA (buf), new_pcr); GST_LOG_OBJECT (mux, "Outputting a packet of length %d", M2TS_PACKET_LENGTH); ret = gst_pad_push (mux->srcpad, buf); if (G_UNLIKELY (ret != GST_FLOW_OK)) { mux->last_flow_ret = ret; return FALSE; } mux->first_pcr = FALSE; mux->previous_pcr = new_pcr; pcr_bytes = M2TS_PACKET_LENGTH; } chunk_bytes = gst_adapter_available (mux->adapter); if (G_UNLIKELY (chunk_bytes)) { /* calculate rate based on latest and previous pcr values */ ts_rate = ((chunk_bytes * STANDARD_TIME_CLOCK) / (new_pcr - mux->previous_pcr)); while (1) { /*loop till all the accumulated ts packets are transformed to m2ts packets and pushed */ current_ts = ((gfloat) mux->previous_pcr / STANDARD_TIME_CLOCK) + ((gfloat) pcr_bytes / ts_rate); m2ts_pcr = (((gint64) (STANDARD_TIME_CLOCK * current_ts / 300) & TWO_POW_33_MINUS1) * 300) + ((gint64) (STANDARD_TIME_CLOCK * current_ts) % 300); temp_ptr = (gint8 *) & m2ts_pcr; out_buf = gst_adapter_take_buffer (mux->adapter, M2TS_PACKET_LENGTH); if (G_UNLIKELY (!out_buf)) break; gst_buffer_set_caps (out_buf, GST_PAD_CAPS (mux->srcpad)); /*writing the 4 byte timestamp value */ GST_WRITE_UINT32_BE (GST_BUFFER_DATA (out_buf), m2ts_pcr); GST_LOG_OBJECT (mux, "Outputting a packet of length %d", M2TS_PACKET_LENGTH); ret = gst_pad_push (mux->srcpad, out_buf); if (G_UNLIKELY (ret != GST_FLOW_OK)) { mux->last_flow_ret = ret; return FALSE; } pcr_bytes += M2TS_PACKET_LENGTH; } mux->previous_pcr = m2ts_pcr; } } else /* If theres no pcr in current ts packet then push the packet to an adapter, which is used to create m2ts packets */ gst_adapter_push (mux->adapter, buf); } else { /* In case of Normal Ts packets */ GST_LOG_OBJECT (mux, "Outputting a packet of length %d", len); buf = gst_buffer_new_and_alloc (len); if (G_UNLIKELY (buf == NULL)) { mux->last_flow_ret = GST_FLOW_ERROR; return FALSE; } gst_buffer_set_caps (buf, GST_PAD_CAPS (mux->srcpad)); memcpy (GST_BUFFER_DATA (buf), data, len); GST_BUFFER_TIMESTAMP (buf) = mux->last_ts; ret = gst_pad_push (mux->srcpad, buf); if (G_UNLIKELY (ret != GST_FLOW_OK)) { mux->last_flow_ret = ret; return FALSE; } } return TRUE; } static gboolean mpegtsdemux_prepare_srcpad (MpegTsMux * mux) { GstEvent *new_seg = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_BYTES, 0, -1, 0); GstCaps *caps = gst_caps_new_simple ("video/mpegts", "systemstream", G_TYPE_BOOLEAN, TRUE, "packetsize", G_TYPE_INT, (mux->m2ts_mode ? M2TS_PACKET_LENGTH : NORMAL_TS_PACKET_LENGTH), NULL); // gst_static_pad_template_get_caps (&mpegtsmux_src_factory); /* Set caps on src pad from our template and push new segment */ gst_pad_set_caps (mux->srcpad, caps); if (!gst_pad_push_event (mux->srcpad, new_seg)) { GST_WARNING_OBJECT (mux, "New segment event was not handled"); return FALSE; } return TRUE; } static GstStateChangeReturn mpegtsmux_change_state (GstElement * element, GstStateChange transition) { MpegTsMux *mux = GST_MPEG_TSMUX (element); GstStateChangeReturn ret; switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: break; case GST_STATE_CHANGE_READY_TO_PAUSED: gst_collect_pads_start (mux->collect); break; case GST_STATE_CHANGE_PAUSED_TO_PLAYING: break; case GST_STATE_CHANGE_PAUSED_TO_READY: gst_collect_pads_stop (mux->collect); break; case GST_STATE_CHANGE_READY_TO_NULL: if (mux->adapter) gst_adapter_clear (mux->adapter); break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { default: break; } return ret; } static gboolean plugin_init (GstPlugin * plugin) { if (!gst_element_register (plugin, "mpegtsmux", GST_RANK_PRIMARY, mpegtsmux_get_type ())) return FALSE; GST_DEBUG_CATEGORY_INIT (mpegtsmux_debug, "mpegtsmux", 0, "MPEG Transport Stream muxer"); return TRUE; } GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "mpegtsmux", "MPEG-TS muxer", plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);