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507 lines
14 KiB
C
507 lines
14 KiB
C
/* MPEG-PS muxer plugin for GStreamer
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* Copyright 2008 Lin YANG <oxcsnicho@gmail.com>
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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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/*
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* Unless otherwise indicated, Source Code is licensed under MIT license.
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* See further explanation attached in License Statement (distributed in the file
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* LICENSE).
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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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 <string.h>
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#include <gst/gst.h>
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#include "mpegpsmux.h"
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#include "psmuxcommon.h"
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#include "psmuxstream.h"
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#include "psmux.h"
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#include "crc.h"
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static gboolean psmux_packet_out (PsMux * mux);
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static gboolean psmux_write_pack_header (PsMux * mux);
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static gboolean psmux_write_system_header (PsMux * mux);
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static gboolean psmux_write_program_stream_map (PsMux * mux);
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/**
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* psmux_new:
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*
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* Create a new muxer session.
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*
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* Returns: A new #PsMux object.
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*/
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PsMux *
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psmux_new (void)
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{
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PsMux *mux;
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mux = g_slice_new0 (PsMux);
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mux->pts = -1; /* uninitialized values */
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mux->pack_hdr_pts = -1;
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mux->sys_hdr_pts = -1;
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mux->psm_pts = -1;
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mux->bit_pts = 0;
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mux->pes_max_payload = PSMUX_PES_MAX_PAYLOAD;
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mux->bit_rate = 400 * 1024; /* XXX: better default values? */
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mux->rate_bound = 2 * 1024; /* 2* bit_rate / (8*50). XXX: any better default? */
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mux->pack_hdr_freq = PSMUX_PACK_HDR_FREQ;
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mux->sys_hdr_freq = PSMUX_SYS_HDR_FREQ;
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mux->psm_freq = PSMUX_PSM_FREQ;
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psmux_stream_id_info_init (&mux->id_info);
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return mux;
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}
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/**
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* psmux_set_write_func:
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* @mux: a #PsMux
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* @func: a user callback function
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* @user_data: user data passed to @func
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*
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* Set the callback function and user data to be called when @mux has output to
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* produce. @user_data will be passed as user data in @func.
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*/
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void
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psmux_set_write_func (PsMux * mux, PsMuxWriteFunc func, void *user_data)
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{
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g_return_if_fail (mux != NULL);
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mux->write_func = func;
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mux->write_func_data = user_data;
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}
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gboolean
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psmux_write_end_code (PsMux * mux)
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{
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guint8 end_code[4] = { 0, 0, 1, PSMUX_PROGRAM_END };
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return mux->write_func (end_code, 4, mux->write_func_data);
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}
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/**
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* psmux_free:
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* @mux: a #PsMux
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*
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* Free all resources associated with @mux. After calling this function @mux can
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* not be used anymore.
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*/
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void
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psmux_free (PsMux * mux)
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{
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GList *cur;
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g_return_if_fail (mux != NULL);
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/* Free all streams */
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for (cur = g_list_first (mux->streams); cur != NULL; cur = g_list_next (cur)) {
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PsMuxStream *stream = (PsMuxStream *) cur->data;
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psmux_stream_free (stream);
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}
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g_list_free (mux->streams);
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if (mux->sys_header != NULL)
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gst_buffer_unref (mux->sys_header);
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if (mux->psm != NULL)
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gst_buffer_unref (mux->psm);
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g_slice_free (PsMux, mux);
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}
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/**
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* psmux_create_stream:
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* @mux: a #PsMux
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* @stream_type: a #PsMuxStreamType
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*
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* Create a new stream of @stream_type in the muxer session @mux.
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*
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* Returns: a new #PsMuxStream.
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*/
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PsMuxStream *
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psmux_create_stream (PsMux * mux, PsMuxStreamType stream_type)
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{
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PsMuxStream *stream;
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// guint16 new_pid;
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g_return_val_if_fail (mux != NULL, NULL);
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#if 0
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if (pid == PSMUX_PID_AUTO) {
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new_pid = psmux_get_new_pid (mux);
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} else {
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new_pid = pid & 0x1FFF;
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}
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/* Ensure we're not creating a PID collision */
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if (psmux_find_stream (mux, new_pid))
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return NULL;
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#endif
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stream = psmux_stream_new (mux, stream_type);
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mux->streams = g_list_prepend (mux->streams, stream);
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if (stream->stream_id_ext) {
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if (!mux->nb_private_streams)
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mux->nb_streams++;
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mux->nb_private_streams++;
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} else
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mux->nb_streams++;
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if (stream->is_video_stream) {
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mux->video_bound++;
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if (mux->video_bound > 32)
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g_critical ("Number of video es exceeds upper limit");
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} else if (stream->is_audio_stream) {
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mux->audio_bound++;
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if (mux->audio_bound > 64)
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g_critical ("Number of audio es exceeds upper limit");
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}
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return stream;
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}
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static gboolean
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psmux_packet_out (PsMux * mux)
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{
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gboolean res;
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if (G_UNLIKELY (mux->write_func == NULL))
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return TRUE;
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res = mux->write_func (mux->packet_buf, mux->packet_bytes_written,
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mux->write_func_data);
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if (res) {
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mux->bit_size += mux->packet_bytes_written;
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}
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mux->packet_bytes_written = 0;
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return res;
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}
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/**
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* psmux_write_stream_packet:
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* @mux: a #PsMux
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* @stream: a #PsMuxStream
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*
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* Write a packet of @stream.
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*
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* Returns: TRUE if the packet could be written.
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*/
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gboolean
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psmux_write_stream_packet (PsMux * mux, PsMuxStream * stream)
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{
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gboolean res;
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g_return_val_if_fail (mux != NULL, FALSE);
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g_return_val_if_fail (stream != NULL, FALSE);
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{
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guint64 ts = psmux_stream_get_pts (stream);
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if (ts != -1)
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mux->pts = ts;
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}
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if (mux->pts - mux->pack_hdr_pts > PSMUX_PACK_HDR_INTERVAL
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|| mux->pes_cnt % mux->pack_hdr_freq == 0) {
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/* Time to write pack header */
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/* FIXME: currently we write the mux rate of the PREVIOUS pack into the
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* pack header, because of the incapability to calculate the mux_rate
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* before outputting the pack. To calculate the mux_rate for the current
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* pack, we need to put the whole pack into buffer, calculate the
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* mux_rate, and then output the whole trunck.
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*/
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if (mux->pts != -1 && mux->pts > mux->bit_pts
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&& mux->pts - mux->bit_pts > PSMUX_BITRATE_CALC_INTERVAL) {
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/* XXX: smoothing the rate? */
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mux->bit_rate =
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gst_util_uint64_scale (mux->bit_size, 8 * CLOCKBASE,
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(mux->pts - mux->bit_pts));
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mux->bit_size = 0;
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mux->bit_pts = mux->pts;
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}
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psmux_write_pack_header (mux);
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mux->pack_hdr_pts = mux->pts;
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}
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if (mux->pes_cnt % mux->sys_hdr_freq == 0) {
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/* Time to write system header */
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psmux_write_system_header (mux);
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mux->sys_hdr_pts = mux->pts;
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}
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if (mux->pes_cnt % mux->psm_freq == 0) {
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/* Time to write program stream map (PSM) */
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psmux_write_program_stream_map (mux);
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mux->psm_pts = mux->pts;
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}
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/* Write the packet */
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if (!(mux->packet_bytes_written =
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psmux_stream_get_data (stream, mux->packet_buf,
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mux->pes_max_payload + PSMUX_PES_MAX_HDR_LEN))) {
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return FALSE;
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}
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res = psmux_packet_out (mux);
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if (!res) {
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GST_DEBUG_OBJECT (mux, "packet write false");
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return FALSE;
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}
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mux->pes_cnt += 1;
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return res;
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}
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static gboolean
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psmux_write_pack_header (PsMux * mux)
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{
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bits_buffer_t bw;
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guint64 scr = mux->pts; /* XXX: is this correct? necessary to put any offset? */
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if (mux->pts == -1)
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scr = 0;
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/* pack_start_code */
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bits_initwrite (&bw, 14, mux->packet_buf);
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bits_write (&bw, 24, PSMUX_START_CODE_PREFIX);
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bits_write (&bw, 8, PSMUX_PACK_HEADER);
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/* scr */
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bits_write (&bw, 2, 0x1);
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bits_write (&bw, 3, (scr >> 30) & 0x07);
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bits_write (&bw, 1, 1);
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bits_write (&bw, 15, (scr >> 15) & 0x7fff);
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bits_write (&bw, 1, 1);
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bits_write (&bw, 15, scr & 0x7fff);
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bits_write (&bw, 1, 1);
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bits_write (&bw, 9, 0); /* system_clock_reference_extension: set to 0 (like what VLC does) */
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bits_write (&bw, 1, 1);
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{
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/* Scale to get the mux_rate, rounding up */
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guint mux_rate =
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gst_util_uint64_scale (mux->bit_rate + 8 * 50 - 1, 1, 8 * 50);
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if (mux_rate > mux->rate_bound / 2)
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mux->rate_bound = mux_rate * 2;
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bits_write (&bw, 22, mux_rate); /* program_mux_rate */
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bits_write (&bw, 2, 3);
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}
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bits_write (&bw, 5, 0x1f);
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bits_write (&bw, 3, 0); /* pack_stuffing_length */
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mux->packet_bytes_written = 14;
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return psmux_packet_out (mux);
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}
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static void
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psmux_ensure_system_header (PsMux * mux)
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{
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bits_buffer_t bw;
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guint len = 12 + (mux->nb_streams +
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(mux->nb_private_streams > 1 ? mux->nb_private_streams - 1 : 0)) * 3;
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GList *cur;
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gboolean private_hit = FALSE;
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guint8 *data;
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if (mux->sys_header != NULL)
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return;
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data = g_malloc (len);
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bits_initwrite (&bw, len, data);
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/* system_header start code */
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bits_write (&bw, 24, PSMUX_START_CODE_PREFIX);
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bits_write (&bw, 8, PSMUX_SYSTEM_HEADER);
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bits_write (&bw, 16, len - 6); /* header_length (bytes after this field) */
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bits_write (&bw, 1, 1); /* marker */
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bits_write (&bw, 22, mux->rate_bound); /* rate_bound */
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bits_write (&bw, 1, 1); /* marker */
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bits_write (&bw, 6, mux->audio_bound); /* audio_bound */
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bits_write (&bw, 1, 0); /* fixed_flag */
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bits_write (&bw, 1, 0); /* CSPS_flag */
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bits_write (&bw, 1, 0); /* system_audio_lock_flag */
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bits_write (&bw, 1, 0); /* system_video_lock_flag */
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bits_write (&bw, 1, 1); /* marker */
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bits_write (&bw, 5, mux->video_bound); /* video_bound */
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bits_write (&bw, 1, 0); /* packet_rate_restriction_flag */
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bits_write (&bw, 7, 0x7f); /* reserved_bits */
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for (cur = mux->streams, private_hit = FALSE; cur != NULL; cur = cur->next) {
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PsMuxStream *stream = (PsMuxStream *) cur->data;
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if (private_hit && stream->stream_id == PSMUX_EXTENDED_STREAM)
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continue;
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bits_write (&bw, 8, stream->stream_id); /* stream_id */
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bits_write (&bw, 2, 0x3); /* reserved */
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bits_write (&bw, 1, stream->is_video_stream); /* buffer_bound_scale */
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bits_write (&bw, 13, stream->max_buffer_size / (stream->is_video_stream ? 1024 : 128)); /* buffer_size_bound */
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if (stream->stream_id == PSMUX_EXTENDED_STREAM)
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private_hit = TRUE;
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}
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GST_MEMDUMP ("System Header", data, len);
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mux->sys_header = gst_buffer_new_wrapped (data, len);
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}
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static gboolean
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psmux_write_system_header (PsMux * mux)
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{
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GstMapInfo map;
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psmux_ensure_system_header (mux);
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gst_buffer_map (mux->sys_header, &map, GST_MAP_READ);
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memcpy (mux->packet_buf, map.data, map.size);
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mux->packet_bytes_written = map.size;
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gst_buffer_unmap (mux->sys_header, &map);
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return psmux_packet_out (mux);
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}
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static void
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psmux_ensure_program_stream_map (PsMux * mux)
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{
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gint psm_size = 16, es_map_size = 0;
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bits_buffer_t bw;
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GList *cur;
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guint16 len;
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guint8 *pos;
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guint8 *data;
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if (mux->psm != NULL)
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return;
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/* pre-write the descriptor loop */
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pos = mux->es_info_buf;
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for (cur = mux->streams; cur != NULL; cur = cur->next) {
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PsMuxStream *stream = (PsMuxStream *) cur->data;
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len = 0;
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*pos++ = stream->stream_type;
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*pos++ = stream->stream_id;
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psmux_stream_get_es_descrs (stream, pos + 2, &len);
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psmux_put16 (&pos, len);
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es_map_size += len + 4;
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pos += len;
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#if 0
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if (stream->lang[0] != 0)
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es_map_size += 6;
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#endif
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}
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psm_size += es_map_size;
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data = g_malloc (psm_size);
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bits_initwrite (&bw, psm_size, data);
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/* psm start code */
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bits_write (&bw, 24, PSMUX_START_CODE_PREFIX);
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bits_write (&bw, 8, PSMUX_PROGRAM_STREAM_MAP);
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bits_write (&bw, 16, psm_size - 6); /* psm_length */
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bits_write (&bw, 1, 1); /* current_next_indicator */
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bits_write (&bw, 2, 0xF); /* reserved */
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bits_write (&bw, 5, 0x1); /* psm_version = 1 */
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bits_write (&bw, 7, 0xFF); /* reserved */
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bits_write (&bw, 1, 1); /* marker */
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bits_write (&bw, 16, 0); /* program_stream_info_length */
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/* program_stream_info empty */
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bits_write (&bw, 16, es_map_size); /* elementary_stream_map_length */
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memcpy (bw.p_data + bw.i_data, mux->es_info_buf, es_map_size);
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/* CRC32 */
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{
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guint32 crc = calc_crc32 (bw.p_data, psm_size - 4);
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guint8 *pos = bw.p_data + psm_size - 4;
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psmux_put32 (&pos, crc);
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}
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GST_MEMDUMP ("Program Stream Map", data, psm_size);
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mux->psm = gst_buffer_new_wrapped (data, psm_size);
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}
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static gboolean
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psmux_write_program_stream_map (PsMux * mux)
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{
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GstMapInfo map;
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psmux_ensure_program_stream_map (mux);
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gst_buffer_map (mux->psm, &map, GST_MAP_READ);
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memcpy (mux->packet_buf, map.data, map.size);
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mux->packet_bytes_written = map.size;
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gst_buffer_unmap (mux->psm, &map);
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return psmux_packet_out (mux);
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}
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GList *
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psmux_get_stream_headers (PsMux * mux)
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{
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GList *list;
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psmux_ensure_system_header (mux);
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psmux_ensure_program_stream_map (mux);
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list = g_list_append (NULL, gst_buffer_ref (mux->sys_header));
|
|
list = g_list_append (list, gst_buffer_ref (mux->psm));
|
|
|
|
return list;
|
|
}
|