gstreamer/gst/mpegpsmux/psmux.c
2009-08-31 09:14:32 +02:00

443 lines
12 KiB
C

/* MPEG-PS muxer plugin for GStreamer
* Copyright 2008 Lin YANG <oxcsnicho@gmail.com>
*
* 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.
*/
/*
* 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 <string.h>
#include <gst/gst.h>
#include "mpegpsmux.h"
#include "psmuxcommon.h"
#include "psmuxstream.h"
#include "psmux.h"
#include "crc.h"
static gboolean psmux_packet_out (PsMux * mux);
static gboolean psmux_write_pack_header (PsMux * mux);
static gboolean psmux_write_system_header (PsMux * mux);
static gboolean psmux_write_program_stream_map (PsMux * mux);
/**
* psmux_new:
*
* Create a new muxer session.
*
* Returns: A new #PsMux object.
*/
PsMux *
psmux_new ()
{
PsMux *mux;
mux = g_slice_new0 (PsMux);
mux->pts = -1; /* uninitialized values */
mux->pack_hdr_pts = -1;
mux->sys_hdr_pts = -1;
mux->psm_pts = -1;
mux->bit_pts = 0;
mux->pes_max_payload = PSMUX_PES_MAX_PAYLOAD;
mux->bit_rate = 400 * 1024; /* XXX: better default values? */
mux->rate_bound = 2 * 1024; /* 2* bit_rate / (8*50). XXX: any better default? */
mux->pack_hdr_freq = PSMUX_PACK_HDR_FREQ;
mux->sys_hdr_freq = PSMUX_SYS_HDR_FREQ;
mux->psm_freq = PSMUX_PSM_FREQ;
psmux_stream_id_info_init (&mux->id_info);
return mux;
}
/**
* psmux_set_write_func:
* @mux: a #PsMux
* @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
psmux_set_write_func (PsMux * mux, PsMuxWriteFunc func, void *user_data)
{
g_return_if_fail (mux != NULL);
mux->write_func = func;
mux->write_func_data = user_data;
}
gboolean
psmux_write_end_code (PsMux * mux)
{
guint8 end_code[4] = { 0, 0, 1, PSMUX_PROGRAM_END };
return mux->write_func (end_code, 4, mux->write_func_data);
}
/**
* psmux_free:
* @mux: a #PsMux
*
* Free all resources associated with @mux. After calling this function @mux can
* not be used anymore.
*/
void
psmux_free (PsMux * mux)
{
GList *cur;
g_return_if_fail (mux != NULL);
/* Free all streams */
for (cur = g_list_first (mux->streams); cur != NULL; cur = g_list_next (cur)) {
PsMuxStream *stream = (PsMuxStream *) cur->data;
psmux_stream_free (stream);
}
g_list_free (mux->streams);
g_slice_free (PsMux, mux);
}
/**
* psmux_create_stream:
* @mux: a #PsMux
* @stream_type: a #PsMuxStreamType
*
* Create a new stream of @stream_type in the muxer session @mux.
*
* Returns: a new #PsMuxStream.
*/
PsMuxStream *
psmux_create_stream (PsMux * mux, PsMuxStreamType stream_type)
{
PsMuxStream *stream;
// guint16 new_pid;
g_return_val_if_fail (mux != NULL, NULL);
#if 0
if (pid == PSMUX_PID_AUTO) {
new_pid = psmux_get_new_pid (mux);
} else {
new_pid = pid & 0x1FFF;
}
/* Ensure we're not creating a PID collision */
if (psmux_find_stream (mux, new_pid))
return NULL;
#endif
stream = psmux_stream_new (mux, stream_type);
mux->streams = g_list_prepend (mux->streams, stream);
if (stream->stream_id_ext) {
if (!mux->nb_private_streams)
mux->nb_streams++;
mux->nb_private_streams++;
} else
mux->nb_streams++;
if (stream->is_video_stream) {
mux->video_bound++;
if (mux->video_bound > 32)
g_critical ("Number of video es exceeds upper limit");
} else if (stream->is_audio_stream) {
mux->audio_bound++;
if (mux->audio_bound > 64)
g_critical ("Number of audio es exceeds upper limit");
}
return stream;
}
static gboolean
psmux_packet_out (PsMux * mux)
{
gboolean res;
if (G_UNLIKELY (mux->write_func == NULL))
return TRUE;
res = mux->write_func (mux->packet_buf, mux->packet_bytes_written,
mux->write_func_data);
if (res) {
mux->bit_size += mux->packet_bytes_written;
}
mux->packet_bytes_written = 0;
return res;
}
/**
* psmux_write_stream_packet:
* @mux: a #PsMux
* @stream: a #PsMuxStream
*
* Write a packet of @stream.
*
* Returns: TRUE if the packet could be written.
*/
gboolean
psmux_write_stream_packet (PsMux * mux, PsMuxStream * stream)
{
gboolean res;
g_return_val_if_fail (mux != NULL, FALSE);
g_return_val_if_fail (stream != NULL, FALSE);
{
guint64 ts = psmux_stream_get_pts (stream);
if (ts != -1)
mux->pts = ts;
}
if (mux->pts - mux->pack_hdr_pts > PSMUX_PACK_HDR_INTERVAL
|| mux->pes_cnt % mux->pack_hdr_freq == 0) {
/* Time to write pack header */
/* FIXME: currently we write the mux rate of the PREVIOUS pack into the
* pack header, because of the incapability to calculate the mux_rate
* before outputing the pack. To calculate the mux_rate for the current
* pack, we need to put the whole pack into buffer, calculate the
* mux_rate, and then output the whole trunck.
*/
if (mux->pts != -1 && mux->pts > mux->bit_pts
&& mux->pts - mux->bit_pts > PSMUX_BITRATE_CALC_INTERVAL) {
/* XXX: smoothing the rate? */
mux->bit_rate =
gst_util_uint64_scale (mux->bit_size, 8 * CLOCKBASE,
(mux->pts - mux->bit_pts));
mux->bit_size = 0;
mux->bit_pts = mux->pts;
}
psmux_write_pack_header (mux);
mux->pack_hdr_pts = mux->pts;
}
if (mux->pes_cnt % mux->sys_hdr_freq == 0) {
/* Time to write system header */
psmux_write_system_header (mux);
mux->sys_hdr_pts = mux->pts;
}
if (mux->pes_cnt % mux->psm_freq == 0) {
/* Time to write program stream map (PSM) */
psmux_write_program_stream_map (mux);
mux->psm_pts = mux->pts;
}
/* Write the packet */
if (!(mux->packet_bytes_written =
psmux_stream_get_data (stream, mux->packet_buf,
mux->pes_max_payload + PSMUX_PES_MAX_HDR_LEN))) {
return FALSE;
}
res = psmux_packet_out (mux);
if (!res) {
PS_DEBUG ("packet write false");
return FALSE;
}
mux->pes_cnt += 1;
return res;
}
static gboolean
psmux_write_pack_header (PsMux * mux)
{
bits_buffer_t bw;
guint64 scr = mux->pts; /* XXX: is this correct? necessary to put any offset? */
if (mux->pts == -1)
scr = 0;
/* pack_start_code */
bits_initwrite (&bw, 14, mux->packet_buf);
bits_write (&bw, 24, PSMUX_START_CODE_PREFIX);
bits_write (&bw, 8, PSMUX_PACK_HEADER);
/* scr */
bits_write (&bw, 2, 0x1);
bits_write (&bw, 3, (scr >> 30) & 0x07);
bits_write (&bw, 1, 1);
bits_write (&bw, 15, (scr >> 15) & 0x7fff);
bits_write (&bw, 1, 1);
bits_write (&bw, 15, scr & 0x7fff);
bits_write (&bw, 1, 1);
bits_write (&bw, 9, 0); /* system_clock_reference_extension: set to 0 (like what VLC does) */
bits_write (&bw, 1, 1);
{
/* Scale to get the mux_rate, rounding up */
guint mux_rate =
gst_util_uint64_scale (mux->bit_rate + 8 * 50 - 1, 1, 8 * 50);
if (mux_rate > mux->rate_bound / 2)
mux->rate_bound = mux_rate * 2;
bits_write (&bw, 22, mux_rate); /* program_mux_rate */
bits_write (&bw, 2, 3);
}
bits_write (&bw, 5, 0x1f);
bits_write (&bw, 3, 0); /* pack_stuffing_length */
mux->packet_bytes_written = 14;
return psmux_packet_out (mux);
}
static gboolean
psmux_write_system_header (PsMux * mux)
{
bits_buffer_t bw;
guint len = 12 + (mux->nb_streams +
(mux->nb_private_streams > 1 ? mux->nb_private_streams - 1 : 0)) * 3;
GList *cur;
gboolean private_hit = FALSE;
/* system_header_start_code */
bits_initwrite (&bw, len, mux->packet_buf);
/* system_header start code */
bits_write (&bw, 24, PSMUX_START_CODE_PREFIX);
bits_write (&bw, 8, PSMUX_SYSTEM_HEADER);
bits_write (&bw, 16, len); /* header_length */
bits_write (&bw, 1, 1); /* marker */
bits_write (&bw, 22, mux->rate_bound); /* rate_bound */
bits_write (&bw, 1, 1); /* marker */
bits_write (&bw, 6, mux->audio_bound); /* audio_bound */
bits_write (&bw, 1, 0); /* fixed_flag */
bits_write (&bw, 1, 0); /* CSPS_flag */
bits_write (&bw, 1, 0); /* system_audio_lock_flag */
bits_write (&bw, 1, 0); /* system_video_lock_flag */
bits_write (&bw, 1, 1); /* marker */
bits_write (&bw, 5, mux->video_bound); /* video_bound */
bits_write (&bw, 1, 0); /* packet_rate_restriction_flag */
bits_write (&bw, 7, 0x7f); /* reserved_bits */
for (cur = g_list_first (mux->streams), private_hit = FALSE; cur != NULL;
cur = g_list_next (cur)) {
PsMuxStream *stream = (PsMuxStream *) cur->data;
if (private_hit && stream->stream_id == PSMUX_EXTENDED_STREAM)
continue;
bits_write (&bw, 8, stream->stream_id); /* stream_id */
bits_write (&bw, 2, 0x3); /* reserved */
bits_write (&bw, 1, stream->is_video_stream); /* buffer_bound_scale */
bits_write (&bw, 13, stream->max_buffer_size / (stream->is_video_stream ? 1024 : 128)); /* buffer_size_bound */
if (stream->stream_id == PSMUX_EXTENDED_STREAM)
private_hit = TRUE;
}
mux->packet_bytes_written = len;
return psmux_packet_out (mux);
}
static gboolean
psmux_write_program_stream_map (PsMux * mux)
{
gint psm_size = 16, es_map_size = 0;
bits_buffer_t bw;
GList *cur;
guint16 len;
guint8 *pos;
/* pre-write the descriptor loop */
pos = mux->es_info_buf;
for (cur = g_list_first (mux->streams); cur != NULL; cur = g_list_next (cur)) {
PsMuxStream *stream = (PsMuxStream *) cur->data;
len = 0;
*pos++ = stream->stream_type;
*pos++ = stream->stream_id;
psmux_stream_get_es_descrs (stream, pos + 2, &len);
psmux_put16 (&pos, len);
es_map_size += len + 4;
pos += len;
#if 0
if (stream->lang[0] != 0)
es_map_size += 6;
#endif
}
psm_size += es_map_size;
bits_initwrite (&bw, psm_size, mux->packet_buf);
/* psm start code */
bits_write (&bw, 24, PSMUX_START_CODE_PREFIX);
bits_write (&bw, 8, PSMUX_PROGRAM_STREAM_MAP);
bits_write (&bw, 16, psm_size - 6); /* psm_length */
bits_write (&bw, 1, 1); /* current_next_indicator */
bits_write (&bw, 2, 0xF); /* reserved */
bits_write (&bw, 5, 0x1); /* psm_version = 1 */
bits_write (&bw, 7, 0xFF); /* reserved */
bits_write (&bw, 1, 1); /* marker */
bits_write (&bw, 16, 0); /* program_stream_info_length */
/* program_stream_info empty */
bits_write (&bw, 16, es_map_size); /* elementary_stream_map_length */
memcpy (bw.p_data + bw.i_data, mux->es_info_buf, es_map_size);
/* CRC32 */
{
guint32 crc = calc_crc32 (mux->packet_buf, psm_size - 4);
guint8 *pos = mux->packet_buf + psm_size - 4;
psmux_put32 (&pos, crc);
}
mux->packet_bytes_written = psm_size;
return psmux_packet_out (mux);
}