gstreamer/gst/mpeg1sys/gstmpeg1systemencode.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
/*#define DEBUG_ENABLED */
#include "gstmpeg1systemencode.h"
#include "main.h"
/*#define GST_DEBUG(a, b...) g_print (##b) */
/* elementfactory information */
static GstElementDetails system_encode_details = {
"MPEG1 Multiplexer",
"Codec/Muxer",
"Multiplexes MPEG-1 Streams",
VERSION,
"Wim Taymans <wim.taymans@chello.be>",
"(C) 2000",
};
/* GstMPEG1SystemEncode signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
GST_PAD_TEMPLATE_FACTORY (src_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"src_video",
"video/mpeg",
"mpegversion", GST_PROPS_INT (1),
"systemstream", GST_PROPS_BOOLEAN (TRUE)
)
)
GST_PAD_TEMPLATE_FACTORY (video_sink_factory,
"video_%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_CAPS_NEW (
"sink_video",
"video/mpeg",
"mpegversion", GST_PROPS_INT (1),
"systemstream", GST_PROPS_BOOLEAN (FALSE)
)
)
GST_PAD_TEMPLATE_FACTORY (audio_sink_factory,
"audio_%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_CAPS_NEW (
"sink_audio",
"audio/mp3",
NULL
)
)
static void gst_system_encode_class_init (GstMPEG1SystemEncodeClass *klass);
static void gst_system_encode_init (GstMPEG1SystemEncode *system_encode);
static GstPad* gst_system_encode_request_new_pad (GstElement *element, GstPadTemplate *templ,
const gchar *unused);
static void gst_system_encode_chain (GstPad *pad, GstBuffer *buf);
static void gst_system_encode_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_system_encode_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static GstElementClass *parent_class = NULL;
/*static guint gst_system_encode_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_mpeg1_system_encode_get_type (void)
{
static GType system_encode_type = 0;
if (!system_encode_type) {
static const GTypeInfo system_encode_info = {
sizeof(GstMPEG1SystemEncodeClass),
NULL,
NULL,
(GClassInitFunc)gst_system_encode_class_init,
NULL,
NULL,
sizeof(GstMPEG1SystemEncode),
0,
(GInstanceInitFunc)gst_system_encode_init,
NULL
};
system_encode_type = g_type_register_static(GST_TYPE_ELEMENT, "GstMPEG1SystemEncode", &system_encode_info, 0);
}
return system_encode_type;
}
static void
gst_system_encode_class_init (GstMPEG1SystemEncodeClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
gobject_class->set_property = gst_system_encode_set_property;
gobject_class->get_property = gst_system_encode_get_property;
gstelement_class->request_new_pad = gst_system_encode_request_new_pad;
}
static void
gst_system_encode_init (GstMPEG1SystemEncode *system_encode)
{
system_encode->srcpad = gst_pad_new_from_template (
GST_PAD_TEMPLATE_GET (src_factory), "src");
gst_element_add_pad (GST_ELEMENT (system_encode), system_encode->srcpad);
system_encode->video_buffer = mpeg1mux_buffer_new (BUFFER_TYPE_VIDEO, 0xE0);
system_encode->audio_buffer = mpeg1mux_buffer_new (BUFFER_TYPE_AUDIO, 0xC0);
system_encode->have_setup = FALSE;
system_encode->mta = NULL;
system_encode->packet_size = 2048;
system_encode->lock = g_mutex_new();
system_encode->current_pack = system_encode->packets_per_pack = 3;
system_encode->video_delay_ms = 0;
system_encode->audio_delay_ms = 0;
system_encode->sectors_delay = 0;
system_encode->startup_delay = ~1;
system_encode->which_streams = 0;
system_encode->num_audio_pads = 0;
system_encode->num_video_pads = 0;
system_encode->pack = g_malloc (sizeof (Pack_struc));
system_encode->sys_header = g_malloc (sizeof (Sys_header_struc));
system_encode->sector = g_malloc (sizeof (Sector_struc));
}
static GstPad*
gst_system_encode_request_new_pad (GstElement *element, GstPadTemplate *templ, const gchar *unused)
{
GstMPEG1SystemEncode *system_encode;
gchar *name = NULL;
GstPad *newpad;
g_return_val_if_fail (templ != NULL, NULL);
if (templ->direction != GST_PAD_SINK) {
g_warning ("system_encode: request pad that is not a SINK pad\n");
return NULL;
}
system_encode = GST_SYSTEM_ENCODE (element);
if (templ == GST_PAD_TEMPLATE_GET (audio_sink_factory)) {
name = g_strdup_printf ("audio_%02d", system_encode->num_audio_pads);
g_print ("%s\n", name);
newpad = gst_pad_new_from_template (templ, name);
gst_pad_set_element_private (newpad, GINT_TO_POINTER (system_encode->num_audio_pads));
system_encode->audio_pad[system_encode->num_audio_pads] = newpad;
system_encode->num_audio_pads++;
system_encode->which_streams |= STREAMS_AUDIO;
}
else if (templ == GST_PAD_TEMPLATE_GET (video_sink_factory)) {
name = g_strdup_printf ("video_%02d", system_encode->num_video_pads);
g_print ("%s\n", name);
newpad = gst_pad_new_from_template (templ, name);
gst_pad_set_element_private (newpad, GINT_TO_POINTER (system_encode->num_video_pads));
system_encode->video_pad[system_encode->num_video_pads] = newpad;
system_encode->num_video_pads++;
system_encode->which_streams |= STREAMS_VIDEO;
}
else {
g_warning ("system_encode: this is not our template!\n");
return NULL;
}
gst_pad_set_chain_function (newpad, gst_system_encode_chain);
gst_element_add_pad (GST_ELEMENT (system_encode), newpad);
return newpad;
}
/* return a list of all the highest prioripty streams */
static GList*
gst_system_encode_pick_streams (GList *mta, GstMPEG1SystemEncode *system_encode)
{
guint64 lowest = ~1;
GST_DEBUG (0, "pick_streams: %lld, %lld", system_encode->video_buffer->next_frame_time,
system_encode->audio_buffer->next_frame_time);
if (system_encode->which_streams & STREAMS_VIDEO) {
if (system_encode->video_buffer->next_frame_time < lowest-system_encode->video_delay) {
lowest = system_encode->video_buffer->next_frame_time;
}
}
if (system_encode->which_streams & STREAMS_AUDIO) {
if (system_encode->audio_buffer->next_frame_time < lowest-system_encode->audio_delay) {
lowest = system_encode->audio_buffer->next_frame_time;
}
}
if (system_encode->which_streams & STREAMS_VIDEO) {
if (system_encode->video_buffer->next_frame_time == lowest) {
mta = g_list_append(mta, system_encode->video_buffer);
}
}
if (system_encode->which_streams & STREAMS_AUDIO) {
if (system_encode->audio_buffer->next_frame_time == lowest) {
mta = g_list_append(mta, system_encode->audio_buffer);
}
}
return mta;
}
static gboolean
gst_system_encode_have_data (GstMPEG1SystemEncode *system_encode)
{
if (system_encode->which_streams == (STREAMS_VIDEO | STREAMS_AUDIO)) {
if (MPEG1MUX_BUFFER_QUEUED(system_encode->audio_buffer) > 2 &&
MPEG1MUX_BUFFER_SPACE(system_encode->audio_buffer) > system_encode->packet_size*2 &&
MPEG1MUX_BUFFER_QUEUED(system_encode->video_buffer) > 2 &&
MPEG1MUX_BUFFER_SPACE(system_encode->video_buffer) > system_encode->packet_size*2) {
return TRUE;
}
}
if (system_encode->which_streams == STREAMS_VIDEO) {
if (MPEG1MUX_BUFFER_QUEUED(system_encode->video_buffer) > 2 &&
MPEG1MUX_BUFFER_SPACE(system_encode->video_buffer) > system_encode->packet_size*2) {
return TRUE;
}
}
if (system_encode->which_streams == STREAMS_VIDEO) {
if (MPEG1MUX_BUFFER_QUEUED(system_encode->audio_buffer) > 2 &&
MPEG1MUX_BUFFER_SPACE(system_encode->audio_buffer) > system_encode->packet_size*2) {
return TRUE;
}
}
return FALSE;
}
static GList*
gst_system_encode_update_mta (GstMPEG1SystemEncode *system_encode, GList *mta, gulong size)
{
GList *streams = g_list_first(mta);
Mpeg1MuxBuffer *mb = (Mpeg1MuxBuffer *)streams->data;
GST_DEBUG (0,"system_encode::multiplex: update mta");
mpeg1mux_buffer_shrink(mb, size);
mta = g_list_remove(mta, mb);
return mta;
}
static void
gst_system_setup_multiplex (GstMPEG1SystemEncode *system_encode)
{
Mpeg1MuxTimecode *video_tc, *audio_tc;
system_encode->audio_buffer_size = 4*1024;
system_encode->video_buffer_size = 46*1024;
system_encode->bytes_output = 0;
system_encode->min_packet_data = system_encode->packet_size - PACK_HEADER_SIZE - SYS_HEADER_SIZE -
PACKET_HEADER_SIZE - AFTER_PACKET_LENGTH;
system_encode->max_packet_data = system_encode->packet_size - PACKET_HEADER_SIZE - AFTER_PACKET_LENGTH;
if (system_encode->which_streams & STREAMS_VIDEO) {
system_encode->video_rate = system_encode->video_buffer->info.video.bit_rate * 50;
}
else system_encode->video_rate = 0;
if (system_encode->which_streams & STREAMS_AUDIO)
system_encode->audio_rate = system_encode->audio_buffer->info.audio.bit_rate * 128;
else system_encode->audio_rate = 0;
system_encode->data_rate = system_encode->video_rate + system_encode->audio_rate;
system_encode->dmux_rate = ceil((double)(system_encode->data_rate) *
((double)(system_encode->packet_size)/(double)(system_encode->min_packet_data) +
((double)(system_encode->packet_size)/(double)(system_encode->max_packet_data) *
(double)(system_encode->packets_per_pack-1.))) / (double)(system_encode->packets_per_pack) );
system_encode->data_rate = ceil(system_encode->dmux_rate/50.)*50;
GST_DEBUG (0,"system_encode::multiplex: data_rate %u, video_rate: %u, audio_rate: %u", system_encode->data_rate,
system_encode->video_rate, system_encode->audio_rate);
system_encode->video_delay = (double)system_encode->video_delay_ms*(double)(CLOCKS/1000);
system_encode->audio_delay = (double)system_encode->audio_delay_ms*(double)(CLOCKS/1000);
system_encode->mux_rate = ceil(system_encode->dmux_rate/50.);
system_encode->dmux_rate= system_encode->mux_rate * 50.;
video_tc = MPEG1MUX_BUFFER_FIRST_TIMECODE(system_encode->video_buffer);
audio_tc = MPEG1MUX_BUFFER_FIRST_TIMECODE(system_encode->audio_buffer);
GST_DEBUG (0,"system_encode::video tc %lld, audio tc %lld:", video_tc->DTS, audio_tc->DTS);
system_encode->delay = ((double)system_encode->sectors_delay +
ceil((double)video_tc->length/(double)system_encode->min_packet_data) +
ceil((double)video_tc->length/(double)system_encode->min_packet_data )) *
(double)system_encode->packet_size/system_encode->dmux_rate*(double)CLOCKS;
system_encode->audio_delay += system_encode->delay;
system_encode->video_delay += system_encode->delay;
system_encode->audio_delay = 0;
system_encode->video_delay = 0;
system_encode->delay = 0;
GST_DEBUG (0,"system_encode::multiplex: delay %g, mux_rate: %lu", system_encode->delay, system_encode->mux_rate);
}
static void
gst_system_encode_multiplex(GstMPEG1SystemEncode *system_encode)
{
GList *streams;
Mpeg1MuxBuffer *mb = (Mpeg1MuxBuffer *)streams->data;
guchar timestamps;
guchar buffer_scale;
GstBuffer *outbuf;
Pack_struc *pack;
Sys_header_struc *sys_header;
Mpeg1MuxTimecode *tc;
gulong buffer_size, non_scaled_buffer_size, total_queued;
guint64 PTS, DTS;
g_mutex_lock(system_encode->lock);
while (gst_system_encode_have_data(system_encode)) {
GST_DEBUG (0,"system_encode::multiplex: multiplexing");
if (!system_encode->have_setup) {
gst_system_setup_multiplex(system_encode);
system_encode->have_setup = TRUE;
}
if (system_encode->mta == NULL) {
system_encode->mta = gst_system_encode_pick_streams(system_encode->mta, system_encode);
}
if (system_encode->mta == NULL) break;
system_encode->SCR = (guint64)(system_encode->bytes_output+LAST_SCR_BYTE_IN_PACK)*CLOCKS/system_encode->dmux_rate;
streams = g_list_first(system_encode->mta);
mb = (Mpeg1MuxBuffer *)streams->data;
if (system_encode->current_pack == system_encode->packets_per_pack) {
create_pack(system_encode->pack, system_encode->SCR, system_encode->mux_rate);
create_sys_header (system_encode->sys_header, system_encode->mux_rate, 1, 1, 1, 1, 1, 1,
AUDIO_STR_0, 0, system_encode->audio_buffer_size/128,
VIDEO_STR_0, 1, system_encode->video_buffer_size/1024, system_encode->which_streams );
system_encode->current_pack = 0;
pack = system_encode->pack;
sys_header = system_encode->sys_header;
}
else {
system_encode->current_pack++;
pack = NULL;
sys_header = NULL;
}
tc = MPEG1MUX_BUFFER_FIRST_TIMECODE(mb);
if (mb->new_frame) {
GST_DEBUG (0,"system_encode::multiplex: new frame");
if (tc->frame_type == FRAME_TYPE_AUDIO || tc->frame_type == FRAME_TYPE_IFRAME || tc->frame_type == FRAME_TYPE_PFRAME) {
timestamps = TIMESTAMPS_PTS;
}
else {
timestamps = TIMESTAMPS_PTS_DTS;
}
}
else {
timestamps = TIMESTAMPS_NO;
}
if (tc->frame_type != FRAME_TYPE_AUDIO) {
if (tc->PTS<system_encode->startup_delay)
system_encode->startup_delay = tc->PTS;
}
if (tc->frame_type == FRAME_TYPE_AUDIO) {
buffer_scale = 0;
non_scaled_buffer_size = system_encode->audio_buffer_size;
buffer_size = system_encode->audio_buffer_size/128;
PTS = tc->PTS + system_encode->audio_delay + system_encode->startup_delay;
DTS = tc->PTS + system_encode->audio_delay + system_encode->startup_delay;
}
else {
buffer_scale = 1;
non_scaled_buffer_size = system_encode->video_buffer_size;
buffer_size = system_encode->video_buffer_size/1024;
PTS = tc->PTS + system_encode->video_delay;
DTS = tc->DTS + system_encode->video_delay;
}
total_queued = mpeg1mux_buffer_update_queued(mb, system_encode->SCR);
if (non_scaled_buffer_size - total_queued >= system_encode->packet_size) {
/* write the pack/packet here */
create_sector (system_encode->sector, pack, sys_header,
system_encode->packet_size,
MPEG1MUX_BUFFER_DATA(mb), mb->stream_id, buffer_scale,
buffer_size, TRUE, PTS, DTS,
timestamps, system_encode->which_streams);
/* update mta */
system_encode->mta = gst_system_encode_update_mta(system_encode, system_encode->mta,
system_encode->sector->length_of_packet_data);
}
else {
/* write a padding packet */
create_sector (system_encode->sector, pack, sys_header,
system_encode->packet_size, NULL, PADDING_STR, 0,
0, FALSE, 0, 0,
TIMESTAMPS_NO, system_encode->which_streams);
}
outbuf = gst_buffer_new();
GST_BUFFER_DATA(outbuf) = g_malloc(system_encode->sector->length_of_sector);
GST_BUFFER_SIZE(outbuf) = system_encode->sector->length_of_sector;
memcpy(GST_BUFFER_DATA(outbuf),system_encode->sector->buf, system_encode->sector->length_of_sector);
system_encode->bytes_output += GST_BUFFER_SIZE(outbuf);
gst_pad_push(system_encode->srcpad,outbuf);
GST_DEBUG (0,"system_encode::multiplex: writing %02x", mb->stream_id);
}
gst_info("system_encode::multiplex: data left in video buffer %lu\n", MPEG1MUX_BUFFER_SPACE(system_encode->video_buffer));
gst_info("system_encode::multiplex: data left in audio buffer %lu\n", MPEG1MUX_BUFFER_SPACE(system_encode->audio_buffer));
g_mutex_unlock(system_encode->lock);
}
static void
gst_system_encode_chain (GstPad *pad, GstBuffer *buf)
{
GstMPEG1SystemEncode *system_encode;
guchar *data;
gulong size;
const gchar *padname;
gint channel;
g_return_if_fail(pad != NULL);
g_return_if_fail(GST_IS_PAD(pad));
g_return_if_fail(buf != NULL);
system_encode = GST_SYSTEM_ENCODE (GST_OBJECT_PARENT (pad));
data = GST_BUFFER_DATA(buf);
size = GST_BUFFER_SIZE(buf);
GST_DEBUG (0,"system_encode::chain: system_encode: have buffer of size %lu",size);
padname = GST_OBJECT_NAME (pad);
if (strncmp(padname, "audio_", 6) == 0) {
channel = atoi(&padname[6]);
GST_DEBUG (0,"gst_system_encode_chain: got audio buffer in from audio channel %02d", channel);
mpeg1mux_buffer_queue(system_encode->audio_buffer, buf);
}
else if (strncmp(padname, "video_", 6) == 0) {
channel = atoi(&padname[6]);
GST_DEBUG (0,"gst_system_encode_chain: got video buffer in from video channel %02d", channel);
mpeg1mux_buffer_queue(system_encode->video_buffer, buf);
}
else {
g_assert_not_reached ();
}
gst_system_encode_multiplex(system_encode);
gst_buffer_unref(buf);
}
static void
gst_system_encode_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstMPEG1SystemEncode *system_encode;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_SYSTEM_ENCODE(object));
system_encode = GST_SYSTEM_ENCODE(object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_system_encode_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstMPEG1SystemEncode *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_SYSTEM_ENCODE(object));
src = GST_SYSTEM_ENCODE(object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
/* this filter needs the getbits functions */
if (!gst_library_load("gstgetbits")) {
gst_info("system_encode:: could not load support library: 'gstgetbits'\n");
return FALSE;
}
/* create an elementfactory for the system_encode element */
factory = gst_element_factory_new("system_encode",GST_TYPE_SYSTEM_ENCODE,
&system_encode_details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (src_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (audio_sink_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (video_sink_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"system_encode",
plugin_init
};