/* * Copyright 2006 BBC and Fluendo S.A. * * 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., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, 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., 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. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include "tsmux.h" #include "tsmuxstream.h" #define GST_CAT_DEFAULT mpegtsmux_debug /* Maximum total data length for a PAT section is 1024 bytes, minus an * 8 byte header, then the length of each program entry is 32 bits, * then finally a 32 bit CRC. Thus the maximum number of programs in this mux * is (1024 - 8 - 4) / 4 = 253 because it only supports single section PATs */ #define TSMUX_MAX_PROGRAMS 253 #define TSMUX_SECTION_HDR_SIZE 8 #define TSMUX_DEFAULT_NETWORK_ID 0x0001 #define TSMUX_DEFAULT_TS_ID 0x0001 /* HACK: We use a fixed buffering offset for the PCR at the moment - * this is the amount 'in advance' of the stream that the PCR sits. * 1/8 second atm */ #define TSMUX_PCR_OFFSET (TSMUX_CLOCK_FREQ / 8) /* Times per second to write PCR */ #define TSMUX_DEFAULT_PCR_FREQ (25) /* Base for all written PCR and DTS/PTS, * so we have some slack to go backwards */ #define CLOCK_BASE (TSMUX_CLOCK_FREQ * 10 * 360) static gboolean tsmux_write_pat (TsMux * mux); static gboolean tsmux_write_pmt (TsMux * mux, TsMuxProgram * program); static void tsmux_section_free (TsMuxSection * section) { gst_mpegts_section_unref (section->section); g_slice_free (TsMuxSection, section); } /** * tsmux_new: * * Create a new muxer session. * * Returns: A new #TsMux object. */ TsMux * tsmux_new (void) { TsMux *mux; mux = g_slice_new0 (TsMux); mux->transport_id = TSMUX_DEFAULT_TS_ID; mux->next_pgm_no = TSMUX_START_PROGRAM_ID; mux->next_pmt_pid = TSMUX_START_PMT_PID; mux->next_stream_pid = TSMUX_START_ES_PID; mux->pat_changed = TRUE; mux->last_pat_ts = G_MININT64; mux->pat_interval = TSMUX_DEFAULT_PAT_INTERVAL; mux->si_changed = TRUE; mux->last_si_ts = G_MININT64; mux->si_interval = TSMUX_DEFAULT_SI_INTERVAL; mux->si_sections = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, (GDestroyNotify) tsmux_section_free); return mux; } /** * tsmux_set_write_func: * @mux: a #TsMux * @func: a user callback function * @user_data: user data passed to @func * * Set the callback function and user data to be called when @mux has output to * produce. @user_data will be passed as user data in @func. */ void tsmux_set_write_func (TsMux * mux, TsMuxWriteFunc func, void *user_data) { g_return_if_fail (mux != NULL); mux->write_func = func; mux->write_func_data = user_data; } /** * tsmux_set_alloc_func: * @mux: a #TsMux * @func: a user callback function * @user_data: user data passed to @func * * Set the callback function and user data to be called when @mux needs * a new buffer to write a packet into. * @user_data will be passed as user data in @func. */ void tsmux_set_alloc_func (TsMux * mux, TsMuxAllocFunc func, void *user_data) { g_return_if_fail (mux != NULL); mux->alloc_func = func; mux->alloc_func_data = user_data; } /** * tsmux_set_pat_interval: * @mux: a #TsMux * @freq: a new PAT interval * * Set the interval (in cycles of the 90kHz clock) for writing out the PAT table. * * Many transport stream clients might have problems if the PAT table is not * inserted in the stream at regular intervals, especially when initially trying * to figure out the contents of the stream. */ void tsmux_set_pat_interval (TsMux * mux, guint freq) { g_return_if_fail (mux != NULL); mux->pat_interval = freq; } /** * tsmux_get_pat_interval: * @mux: a #TsMux * * Get the configured PAT interval. See also tsmux_set_pat_interval(). * * Returns: the configured PAT interval */ guint tsmux_get_pat_interval (TsMux * mux) { g_return_val_if_fail (mux != NULL, 0); return mux->pat_interval; } /** * tsmux_set_si_interval: * @mux: a #TsMux * @freq: a new SI table interval * * Set the interval (in cycles of the 90kHz clock) for writing out the SI tables. * */ void tsmux_set_si_interval (TsMux * mux, guint freq) { g_return_if_fail (mux != NULL); mux->si_interval = freq; } /** * tsmux_get_si_interval: * @mux: a #TsMux * * Get the configured SI table interval. See also tsmux_set_si_interval(). * * Returns: the configured SI interval */ guint tsmux_get_si_interval (TsMux * mux) { g_return_val_if_fail (mux != NULL, 0); return mux->si_interval; } /** * tsmux_add_mpegts_si_section: * @mux: a #TsMux * @section: (transfer full): a #GstMpegtsSection to add * * Add a Service Information #GstMpegtsSection to the stream * * Returns: %TRUE on success, %FALSE otherwise */ gboolean tsmux_add_mpegts_si_section (TsMux * mux, GstMpegtsSection * section) { TsMuxSection *tsmux_section; g_return_val_if_fail (mux != NULL, FALSE); g_return_val_if_fail (section != NULL, FALSE); g_return_val_if_fail (mux->si_sections != NULL, FALSE); tsmux_section = g_slice_new0 (TsMuxSection); GST_DEBUG ("Adding mpegts section with type %d to mux", section->section_type); tsmux_section->section = section; tsmux_section->pi.pid = section->pid; g_hash_table_insert (mux->si_sections, GINT_TO_POINTER (section->section_type), tsmux_section); mux->si_changed = TRUE; return TRUE; } /** * tsmux_free: * @mux: a #TsMux * * Free all resources associated with @mux. After calling this function @mux can * not be used anymore. */ void tsmux_free (TsMux * mux) { GList *cur; g_return_if_fail (mux != NULL); /* Free PAT section */ if (mux->pat.section) gst_mpegts_section_unref (mux->pat.section); /* Free all programs */ for (cur = mux->programs; cur; cur = cur->next) { TsMuxProgram *program = (TsMuxProgram *) cur->data; tsmux_program_free (program); } g_list_free (mux->programs); /* Free all streams */ for (cur = mux->streams; cur; cur = cur->next) { TsMuxStream *stream = (TsMuxStream *) cur->data; tsmux_stream_free (stream); } g_list_free (mux->streams); /* Free SI table sections */ g_hash_table_destroy (mux->si_sections); g_slice_free (TsMux, mux); } static gint tsmux_program_compare (TsMuxProgram * program, gint * needle) { return (program->pgm_number - *needle); } /** * tsmux_program_new: * @mux: a #TsMux * * Create a new program in the mising session @mux. * * Returns: a new #TsMuxProgram or %NULL when the maximum number of programs has * been reached. */ TsMuxProgram * tsmux_program_new (TsMux * mux, gint prog_id) { TsMuxProgram *program; g_return_val_if_fail (mux != NULL, NULL); /* Ensure we have room for another program */ if (mux->nb_programs == TSMUX_MAX_PROGRAMS) return NULL; program = g_slice_new0 (TsMuxProgram); program->pmt_changed = TRUE; program->last_pmt_ts = G_MININT64; program->pmt_interval = TSMUX_DEFAULT_PMT_INTERVAL; if (prog_id == 0) { program->pgm_number = mux->next_pgm_no++; while (g_list_find_custom (mux->programs, &program->pgm_number, (GCompareFunc) tsmux_program_compare) != NULL) { program->pgm_number = mux->next_pgm_no++; } } else { program->pgm_number = prog_id; while (g_list_find_custom (mux->programs, &program->pgm_number, (GCompareFunc) tsmux_program_compare) != NULL) { program->pgm_number++; } } program->pmt_pid = mux->next_pmt_pid++; program->pcr_stream = NULL; program->streams = g_array_sized_new (FALSE, TRUE, sizeof (TsMuxStream *), 1); mux->programs = g_list_prepend (mux->programs, program); mux->nb_programs++; mux->pat_changed = TRUE; return program; } /** * tsmux_set_pmt_interval: * @program: a #TsMuxProgram * @freq: a new PMT interval * * Set the interval (in cycles of the 90kHz clock) for writing out the PMT table. * * Many transport stream clients might have problems if the PMT table is not * inserted in the stream at regular intervals, especially when initially trying * to figure out the contents of the stream. */ void tsmux_set_pmt_interval (TsMuxProgram * program, guint freq) { g_return_if_fail (program != NULL); program->pmt_interval = freq; } /** * tsmux_get_pmt_interval: * @program: a #TsMuxProgram * * Get the configured PMT interval. See also tsmux_set_pmt_interval(). * * Returns: the configured PMT interval */ guint tsmux_get_pmt_interval (TsMuxProgram * program) { g_return_val_if_fail (program != NULL, 0); return program->pmt_interval; } /** * tsmux_program_add_stream: * @program: a #TsMuxProgram * @stream: a #TsMuxStream * * Add @stream to @program. */ void tsmux_program_add_stream (TsMuxProgram * program, TsMuxStream * stream) { g_return_if_fail (program != NULL); g_return_if_fail (stream != NULL); g_array_append_val (program->streams, stream); program->pmt_changed = TRUE; } /** * tsmux_program_set_pcr_stream: * @program: a #TsMuxProgram * @stream: a #TsMuxStream * * Set @stream as the PCR stream for @program, overwriting the previously * configured PCR stream. When @stream is NULL, program will have no PCR stream * configured. */ void tsmux_program_set_pcr_stream (TsMuxProgram * program, TsMuxStream * stream) { g_return_if_fail (program != NULL); if (program->pcr_stream == stream) return; if (program->pcr_stream != NULL) tsmux_stream_pcr_unref (program->pcr_stream); if (stream) tsmux_stream_pcr_ref (stream); program->pcr_stream = stream; program->pmt_changed = TRUE; } /** * tsmux_get_new_pid: * @mux: a #TsMux * * Get a new free PID. * * Returns: a new free PID. */ guint16 tsmux_get_new_pid (TsMux * mux) { g_return_val_if_fail (mux != NULL, -1); /* make sure this PID is free * (and not taken by a specific earlier request) */ do { mux->next_stream_pid++; } while (tsmux_find_stream (mux, mux->next_stream_pid)); return mux->next_stream_pid; } /** * tsmux_create_stream: * @mux: a #TsMux * @stream_type: a #TsMuxStreamType * @pid: the PID of the new stream. * * Create a new stream of @stream_type in the muxer session @mux. * * When @pid is set to #TSMUX_PID_AUTO, a new free PID will automatically * be allocated for the new stream. * * Returns: a new #TsMuxStream. */ TsMuxStream * tsmux_create_stream (TsMux * mux, TsMuxStreamType stream_type, guint16 pid, gchar * language) { TsMuxStream *stream; guint16 new_pid; g_return_val_if_fail (mux != NULL, NULL); if (pid == TSMUX_PID_AUTO) { new_pid = tsmux_get_new_pid (mux); } else { new_pid = pid & 0x1FFF; } /* Ensure we're not creating a PID collision */ if (tsmux_find_stream (mux, new_pid)) return NULL; stream = tsmux_stream_new (new_pid, stream_type); mux->streams = g_list_prepend (mux->streams, stream); mux->nb_streams++; if (language) g_strlcat (stream->language, language, 3 * sizeof (gchar)); else g_strlcat (stream->language, "eng", 3 * sizeof (gchar)); return stream; } /** * tsmux_find_stream: * @mux: a #TsMux * @pid: the PID to find. * * Find the stream associated wih PID. * * Returns: a #TsMuxStream with @pid or NULL when the stream was not found. */ TsMuxStream * tsmux_find_stream (TsMux * mux, guint16 pid) { TsMuxStream *found = NULL; GList *cur; g_return_val_if_fail (mux != NULL, NULL); for (cur = mux->streams; cur; cur = cur->next) { TsMuxStream *stream = (TsMuxStream *) cur->data; if (tsmux_stream_get_pid (stream) == pid) { found = stream; break; } } return found; } static gboolean tsmux_get_buffer (TsMux * mux, GstBuffer ** buf) { g_return_val_if_fail (buf, FALSE); if (G_UNLIKELY (!mux->alloc_func)) return FALSE; mux->alloc_func (buf, mux->alloc_func_data); if (!*buf) return FALSE; g_assert (gst_buffer_get_size (*buf) == TSMUX_PACKET_LENGTH); return TRUE; } static gboolean tsmux_packet_out (TsMux * mux, GstBuffer * buf, gint64 pcr) { if (G_UNLIKELY (mux->write_func == NULL)) { if (buf) gst_buffer_unref (buf); return TRUE; } return mux->write_func (buf, mux->write_func_data, pcr); } /* * adaptation_field() { * adaptation_field_length 8 uimsbf * if(adaptation_field_length >0) { * discontinuity_indicator 1 bslbf * random_access_indicator 1 bslbf * elementary_stream_priority_indicator 1 bslbf * PCR_flag 1 bslbf * OPCR_flag 1 bslbf * splicing_point_flag 1 bslbf * transport_private_data_flag 1 bslbf * adaptation_field_extension_flag 1 bslbf * if(PCR_flag == '1') { * program_clock_reference_base 33 uimsbf * reserved 6 bslbf * program_clock_reference_extension 9 uimsbf * } * if(OPCR_flag == '1') { * original_program_clock_reference_base 33 uimsbf * reserved 6 bslbf * original_program_clock_reference_extension 9 uimsbf * } * if (splicing_point_flag == '1') { * splice_countdown 8 tcimsbf * } * if(transport_private_data_flag == '1') { * transport_private_data_length 8 uimsbf * for (i=0; iflags & 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) | 0x7e | ((pcr_ext >> 8) & 0x01); /* set 6 reserve bits to 1 */ 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) | 0x7e | ((opcr_ext >> 8) & 0x01); /* set 6 reserve bits to 1 */ 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++] = 0x1f; /* lower 5 bits are reserved, and should be all 1 */ } } /* 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; } static gboolean tsmux_section_write_packet (GstMpegtsSectionType * type, TsMuxSection * section, TsMux * mux) { GstBuffer *section_buffer; GstBuffer *packet_buffer = NULL; GstMemory *mem; guint8 *packet; guint8 *data; gsize data_size = 0; gsize payload_written; guint len = 0, offset = 0, payload_len = 0; guint extra_alloc_bytes = 0; g_return_val_if_fail (section != NULL, FALSE); g_return_val_if_fail (mux != NULL, FALSE); /* Mark the start of new PES unit */ section->pi.packet_start_unit_indicator = TRUE; data = gst_mpegts_section_packetize (section->section, &data_size); if (!data) { TS_DEBUG ("Could not packetize section"); return FALSE; } /* Mark payload data size */ section->pi.stream_avail = data_size; payload_written = 0; /* Wrap section data in a buffer without free function. The data will be freed when the GstMpegtsSection is destroyed. */ section_buffer = gst_buffer_new_wrapped_full (GST_MEMORY_FLAG_READONLY, data, data_size, 0, data_size, NULL, NULL); TS_DEBUG ("Section buffer with size %" G_GSIZE_FORMAT " created", gst_buffer_get_size (section_buffer)); while (section->pi.stream_avail > 0) { packet = g_malloc (TSMUX_PACKET_LENGTH); if (section->pi.packet_start_unit_indicator) { /* Wee need room for a pointer byte */ section->pi.stream_avail++; if (!tsmux_write_ts_header (packet, §ion->pi, &len, &offset)) goto fail; /* Write the pointer byte */ packet[offset++] = 0x00; payload_len = len - 1; } else { if (!tsmux_write_ts_header (packet, §ion->pi, &len, &offset)) goto fail; payload_len = len; } /* Wrap the TS header and adaption field in a GstMemory */ mem = gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY, packet, TSMUX_PACKET_LENGTH, 0, offset, packet, g_free); TS_DEBUG ("Creating packet buffer at offset " "%" G_GSIZE_FORMAT " with length %u", payload_written, payload_len); /* If in M2TS mode, we will need to resize to 4 bytes after the end of the buffer. For performance reasons, we will now try to include 4 extra bytes from the source buffer, then resize down, to avoid having an extra 4 byte GstMemory appended. If the source buffer does not have enough data for this, a new GstMemory will be used */ if (gst_buffer_get_size (section_buffer) - (payload_written + payload_len) >= 4) { /* enough space */ extra_alloc_bytes = 4; } packet_buffer = gst_buffer_copy_region (section_buffer, GST_BUFFER_COPY_ALL, payload_written, payload_len + extra_alloc_bytes); /* Prepend the header to the section data */ gst_buffer_prepend_memory (packet_buffer, mem); /* add an extra 4 bytes if it could not be reserved already */ if (extra_alloc_bytes == 4) { /* we allocated those already, resize */ gst_buffer_set_size (packet_buffer, gst_buffer_get_size (packet_buffer) - extra_alloc_bytes); } else { void *ptr = g_malloc (4); GstMemory *extra = gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY, ptr, 4, 0, 0, ptr, g_free); gst_buffer_append_memory (packet_buffer, extra); } TS_DEBUG ("Writing %d bytes to section. %d bytes remaining", len, section->pi.stream_avail - len); /* Push the packet without PCR */ if (G_UNLIKELY (!tsmux_packet_out (mux, packet_buffer, -1))) { /* Buffer given away */ packet_buffer = NULL; goto fail; } packet_buffer = NULL; section->pi.stream_avail -= len; payload_written += payload_len; section->pi.packet_start_unit_indicator = FALSE; } gst_buffer_unref (section_buffer); return TRUE; fail: g_free (packet); if (section_buffer) gst_buffer_unref (section_buffer); return FALSE; } static gboolean tsmux_write_si (TsMux * mux) { g_hash_table_foreach (mux->si_sections, (GHFunc) tsmux_section_write_packet, mux); mux->si_changed = FALSE; 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; gboolean write_si; GList *cur; cur_pcr = 0; if (cur_pts != G_MININT64) { 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 != G_MININT64) { /* 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 == G_MININT64 || 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 sit */ if (mux->last_si_ts == G_MININT64 || mux->si_changed) write_si = TRUE; else if (cur_pts >= mux->last_si_ts + mux->si_interval) write_si = TRUE; else write_si = FALSE; if (write_si) { mux->last_si_ts = cur_pts; if (!tsmux_write_si (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 == G_MININT64 || 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 != G_MININT64) stream->dts += CLOCK_BASE; if (stream->pts != G_MININT64) 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); GST_DEBUG ("Writing PES of size %d", (int) gst_buffer_get_size (buf)); 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); /* Free PMT section */ if (program->pmt.section) gst_mpegts_section_unref (program->pmt.section); g_array_free (program->streams, TRUE); g_slice_free (TsMuxProgram, program); } static gboolean tsmux_write_pat (TsMux * mux) { if (mux->pat_changed) { /* program_association_section () * 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 */ GList *cur; GPtrArray *pat; pat = gst_mpegts_pat_new (); for (cur = mux->programs; cur; cur = cur->next) { GstMpegtsPatProgram *pat_pgm; TsMuxProgram *program = (TsMuxProgram *) cur->data; pat_pgm = gst_mpegts_pat_program_new (); pat_pgm->program_number = program->pgm_number; pat_pgm->network_or_program_map_PID = program->pmt_pid; g_ptr_array_add (pat, pat_pgm); } if (mux->pat.section) gst_mpegts_section_unref (mux->pat.section); mux->pat.section = gst_mpegts_section_from_pat (pat, mux->transport_id); mux->pat.section->version_number = mux->pat_version++; TS_DEBUG ("PAT has %d programs", mux->nb_programs); mux->pat_changed = FALSE; } return tsmux_section_write_packet (GINT_TO_POINTER (GST_MPEGTS_SECTION_PAT), &mux->pat, mux); } static gboolean tsmux_write_pmt (TsMux * mux, TsMuxProgram * program) { if (program->pmt_changed) { /* program_association_section () * reserved 3 bslbf * PCR_PID 13 uimsbf * reserved 4 bslbf * program_info_length 12 uimsbf * for (i = 0; i < N; i++) * descriptor () * * for (i = 0; i < N1; i++) { * stream_type 8 uimsbf * reserved 3 bslbf * elementary_PID 13 uimbsf * reserved 4 bslbf * ES_info_length 12 uimbsf * for (i = 0; i < N1; i++) { * descriptor (); * } * } */ GstMpegtsDescriptor *descriptor; GstMpegtsPMT *pmt; guint8 desc[] = { 0x0F, 0xFF, 0xFC, 0xFC }; guint i; pmt = gst_mpegts_pmt_new (); if (program->pcr_stream == NULL) pmt->pcr_pid = 0x1FFF; else pmt->pcr_pid = tsmux_stream_get_pid (program->pcr_stream); descriptor = gst_mpegts_descriptor_from_registration ("HDMV", NULL, 0); g_ptr_array_add (pmt->descriptors, descriptor); descriptor = gst_mpegts_descriptor_from_custom (0x88, desc, 4); g_ptr_array_add (pmt->descriptors, descriptor); /* Write out the entries */ for (i = 0; i < program->streams->len; i++) { GstMpegtsPMTStream *pmt_stream; TsMuxStream *stream = g_array_index (program->streams, TsMuxStream *, i); pmt_stream = gst_mpegts_pmt_stream_new (); /* FIXME: Use API to retrieve this from the stream */ pmt_stream->stream_type = stream->stream_type; pmt_stream->pid = tsmux_stream_get_pid (stream); /* Write any ES descriptors needed */ tsmux_stream_get_es_descrs (stream, pmt_stream); g_ptr_array_add (pmt->streams, pmt_stream); } TS_DEBUG ("PMT for program %d has %d streams", program->pgm_number, program->streams->len); pmt->program_number = program->pgm_number; program->pmt.pi.pid = program->pmt_pid; program->pmt_changed = FALSE; if (program->pmt.section) gst_mpegts_section_unref (program->pmt.section); program->pmt.section = gst_mpegts_section_from_pmt (pmt, program->pmt_pid); program->pmt.section->version_number = program->pmt_version++; } return tsmux_section_write_packet (GINT_TO_POINTER (GST_MPEGTS_SECTION_PMT), &program->pmt, mux); }