/* * 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., 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 "tsmux.h" #include "tsmuxstream.h" #include "crc.h" /* 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 #define TSMUX_START_PROGRAM_ID 0x0001 #define TSMUX_START_PMT_PID 0x0010 #define TSMUX_START_ES_PID 0x0040 /* 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) /* PAT frequency (1/10th sec) */ #define TSMUX_DEFAULT_PAT_FREQ (TSMUX_CLOCK_FREQ / 10) /* PMT frequency (1/10th sec) */ #define TSMUX_DEFAULT_PMT_FREQ (TSMUX_CLOCK_FREQ / 10) static gboolean tsmux_write_pat (TsMux * mux); static gboolean tsmux_write_pmt (TsMux * mux, TsMuxProgram * program); /** * tsmux_new: * * Create a new muxer session. * * Returns: A new #TsMux object. */ TsMux * tsmux_new () { 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 = -1; mux->pat_frequency = TSMUX_DEFAULT_PAT_FREQ; 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_pat_frequency: * @mux: a #TsMux * @freq: a new PAT frequency * * Set the frequency (against the 90Hz clock) for writing out the PAT table. * A frequency of 0 will only write the PAT table when it changes. * * 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_frequency (TsMux * mux, guint freq) { g_return_if_fail (mux != NULL); mux->pat_frequency = freq; } /** * tsmux_get_pat_frequency: * @mux: a #TsMux * * Get the configured PAT frequency. See also tsmux_set_pat_frequency(). * * Returns: the configured PAT frequency */ guint tsmux_get_pat_frequency (TsMux * mux) { g_return_val_if_fail (mux != NULL, 0); return mux->pat_frequency; } /** * 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 all programs */ for (cur = g_list_first (mux->programs); cur != NULL; cur = g_list_next (cur)) { TsMuxProgram *program = (TsMuxProgram *) cur->data; tsmux_program_free (program); } g_list_free (mux->programs); /* Free all streams */ for (cur = g_list_first (mux->streams); cur != NULL; cur = g_list_next (cur)) { TsMuxStream *stream = (TsMuxStream *) cur->data; tsmux_stream_free (stream); } g_list_free (mux->streams); g_slice_free (TsMux, mux); } /** * 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) { 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 = -1; program->pmt_frequency = TSMUX_DEFAULT_PMT_FREQ; program->pgm_number = mux->next_pgm_no++; program->pmt_pid = mux->next_pmt_pid++; program->pcr_stream = NULL; program->last_pcr = -1; 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_frequency: * @program: a #TsMuxProgram * @freq: a new PMT frequency * * Set the frequency (against the 90Hz clock) for writing out the PMT table. * A frequency of 0 will only write the PMT table when it changes. * * 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_frequency (TsMuxProgram * program, guint freq) { g_return_if_fail (program != NULL); program->pmt_frequency = freq; } /** * tsmux_get_pmt_frequency: * @program: a #TsMuxProgram * * Get the configured PMT frequency. See also tsmux_set_pmt_frequency(). * * Returns: the configured PMT frequency */ guint tsmux_get_pmt_frequency (TsMuxProgram * program) { g_return_val_if_fail (program != NULL, 0); return program->pmt_frequency; } /** * 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); program->nb_streams++; 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); /* FIXME: It's possible that this next PID is already taken if a * specific PID was requested earlier. We should find a free 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) { 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++; 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 = g_list_first (mux->streams); cur != NULL; cur = g_list_next (cur)) { TsMuxStream *stream = (TsMuxStream *) cur->data; if (tsmux_stream_get_pid (stream) == pid) { found = stream; break; } } return found; } static gboolean tsmux_packet_out (TsMux * mux) { if (G_UNLIKELY (mux->write_func == NULL)) return TRUE; return mux->write_func (mux->packet_buf, TSMUX_PACKET_LENGTH, mux->write_func_data, mux->new_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) | ((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; mux->new_pcr = -1; g_return_val_if_fail (mux != NULL, FALSE); g_return_val_if_fail (stream != NULL, FALSE); if (tsmux_stream_is_pcr (stream)) { gint64 cur_pcr = 0; gint64 cur_pts = tsmux_stream_get_pts (stream); gboolean write_pat; GList *cur; 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 && (cur_pts >= TSMUX_PCR_OFFSET)) 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_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; mux->new_pcr = cur_pcr; } /* check if we need to rewrite pat */ if (mux->last_pat_ts == -1 || mux->pat_changed) write_pat = TRUE; else if (cur_pcr >= mux->last_pat_ts + mux->pat_frequency) write_pat = TRUE; else write_pat = FALSE; if (write_pat) { mux->last_pat_ts = cur_pcr; if (!tsmux_write_pat (mux)) return FALSE; } /* check if we need to rewrite any of the current pmts */ for (cur = g_list_first (mux->programs); cur != NULL; cur = g_list_next (cur)) { TsMuxProgram *program = (TsMuxProgram *) cur->data; gboolean write_pmt; if (program->last_pmt_ts == -1 || program->pmt_changed) write_pmt = TRUE; else if (cur_pcr >= program->last_pmt_ts + program->pmt_frequency) write_pmt = TRUE; else write_pmt = FALSE; if (write_pmt) { program->last_pmt_ts = cur_pcr; if (!tsmux_write_pmt (mux, program)) return FALSE; } } } pi->stream_avail = tsmux_stream_bytes_avail (stream); pi->packet_start_unit_indicator = tsmux_stream_at_pes_start (stream); if (!tsmux_write_ts_header (mux->packet_buf, pi, &payload_len, &payload_offs)) return FALSE; if (!tsmux_stream_get_data (stream, mux->packet_buf + payload_offs, payload_len)) return FALSE; res = tsmux_packet_out (mux); /* Reset all dynamic flags */ stream->pi.flags &= TSMUX_PACKET_FLAG_PES_FULL_HEADER; return res; } /** * 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; pi = §ion->pi; pi->packet_start_unit_indicator = TRUE; cur_in = section->data; payload_remain = pi->stream_avail; while (payload_remain > 0) { if (pi->packet_start_unit_indicator) { /* Need to write an extra single byte start pointer */ pi->stream_avail++; if (!tsmux_write_ts_header (mux->packet_buf, pi, &payload_len, &payload_offs)) { pi->stream_avail--; return FALSE; } pi->stream_avail--; /* Write the pointer byte */ mux->packet_buf[payload_offs] = 0x00; payload_offs++; payload_len--; pi->packet_start_unit_indicator = FALSE; } else { if (!tsmux_write_ts_header (mux->packet_buf, pi, &payload_len, &payload_offs)) return FALSE; } TS_DEBUG ("Outputting %d bytes to section. %d remaining after", payload_len, payload_remain - payload_len); memcpy (mux->packet_buf + payload_offs, cur_in, payload_len); cur_in += payload_len; payload_remain -= payload_len; if (G_UNLIKELY (!tsmux_packet_out (mux))) { mux->new_pcr = -1; return FALSE; } mux->new_pcr = -1; } return TRUE; } 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 = g_list_first (mux->programs); cur != NULL; cur = g_list_next (cur)) { 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 tsmux_write_pmt (TsMux * mux, TsMuxProgram * program) { TsMuxSection *pmt = &program->pmt; if (program->pmt_changed) { /* program_association_section () * table_id 8 uimsbf * section_syntax_indicator 1 bslbf * '0' 1 bslbf * reserved 2 bslbf * section_length 12 uimsbf * program_id 16 uimsbf * reserved 2 bslbf * version_number 5 uimsbf * current_next_indicator 1 bslbf * section_number 8 uimsbf * last_section_number 8 uimsbf * 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 (); * } * } * CRC_32 32 rbchof */ guint8 *pos; guint32 crc; guint i; /* Prepare the section data after the basic section header */ pos = pmt->data + TSMUX_SECTION_HDR_SIZE; if (program->pcr_stream == NULL) tsmux_put16 (&pos, 0xFFFF); else tsmux_put16 (&pos, 0xE000 | tsmux_stream_get_pid (program->pcr_stream)); /* FIXME: Write program descriptors if needed, for now write a * length of 0 */ tsmux_put16 (&pos, 0xF000); /* Write out the entries */ for (i = 0; i < program->nb_streams; i++) { TsMuxStream *stream = g_array_index (program->streams, TsMuxStream *, i); guint16 es_info_len; /* FIXME: Use API to retrieve this from the stream */ *pos++ = stream->stream_type; tsmux_put16 (&pos, 0xE000 | tsmux_stream_get_pid (stream)); /* Write any ES descriptors needed */ tsmux_stream_get_es_descrs (stream, mux->es_info_buf, &es_info_len); tsmux_put16 (&pos, 0xF000 | es_info_len); if (es_info_len > 0) { TS_DEBUG ("Writing descriptor of len %d for PID 0x%04x", es_info_len, tsmux_stream_get_pid (stream)); if (G_UNLIKELY (pos + es_info_len >= pmt->data + TSMUX_MAX_SECTION_LENGTH)) return FALSE; memcpy (pos, mux->es_info_buf, es_info_len); pos += es_info_len; } } /* Include the CRC in the byte count */ pmt->pi.stream_avail = pos - pmt->data + 4; /* Go back and patch the pmt_header now that we know the length. * table_id = 2 for PMT */ tsmux_write_section_hdr (pmt->data, 0x02, pmt->pi.stream_avail, program->pgm_number, program->pmt_version, 0, 0); /* Calc and output CRC for data bytes, * but not counting the CRC bytes this time */ crc = calc_crc32 (pmt->data, pmt->pi.stream_avail - 4); tsmux_put32 (&pos, crc); TS_DEBUG ("PMT for program %d has %d streams, is %u bytes", program->pgm_number, program->nb_streams, pmt->pi.stream_avail); pmt->pi.pid = program->pmt_pid; program->pmt_changed = FALSE; program->pmt_version++; } return tsmux_write_section (mux, pmt); }