gstreamer/gst/mpeg1sys/gstmpeg1systemencode.c

/* 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
};