qtdemux.c 84.6 KB
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/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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 * Copyright (C) <2003> David A. Schleef <ds@schleef.org>
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 *
 * 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.
 */

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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
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#include "qtdemux.h"
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#include <stdlib.h>
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#include <string.h>
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#include <zlib.h>

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GST_DEBUG_CATEGORY_EXTERN (qtdemux_debug);
#define GST_CAT_DEFAULT qtdemux_debug
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/* temporary hack */
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#define gst_util_dump_mem(a,b)  /* */
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#define QTDEMUX_GUINT32_GET(a)	(GST_READ_UINT32_BE(a))
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#define QTDEMUX_GUINT24_GET(a)	(GST_READ_UINT32_BE(a) >> 8)
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#define QTDEMUX_GUINT16_GET(a)	(GST_READ_UINT16_BE(a))
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#define QTDEMUX_GUINT8_GET(a) (*(guint8 *)(a))
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#define QTDEMUX_FP32_GET(a)	((GST_READ_UINT32_BE(a))/65536.0)
#define QTDEMUX_FP16_GET(a)	((GST_READ_UINT16_BE(a))/256.0)
#define QTDEMUX_FOURCC_GET(a)	(GST_READ_UINT32_LE(a))
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#define QTDEMUX_GUINT64_GET(a) ((((guint64)QTDEMUX_GUINT32_GET(a))<<32)|QTDEMUX_GUINT32_GET(((void *)a)+4))
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typedef struct _QtNode QtNode;
typedef struct _QtNodeType QtNodeType;
typedef struct _QtDemuxSample QtDemuxSample;
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//typedef struct _QtDemuxStream QtDemuxStream;

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struct _QtNode
{
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  guint32 type;
  gpointer data;
  int len;
};

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struct _QtNodeType
{
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  guint32 fourcc;
  char *name;
  int flags;
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  void (*dump) (GstQTDemux * qtdemux, void *buffer, int depth);
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};

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struct _QtDemuxSample
{
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  int sample_index;
  int chunk;
  int size;
  guint32 offset;
  guint64 timestamp;
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  guint64 duration;
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};

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struct _QtDemuxStream
{
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  guint32 subtype;
  GstCaps *caps;
  GstPad *pad;
  int n_samples;
  QtDemuxSample *samples;
  int timescale;

  int sample_index;
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  int width;
  int height;
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  float fps;
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  double rate;
  int n_channels;
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  guint bytes_per_frame;
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  guint compression;
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  guint samples_per_packet;
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};

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enum QtDemuxState
{
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  QTDEMUX_STATE_NULL,
  QTDEMUX_STATE_HEADER,
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  QTDEMUX_STATE_HEADER_SEEKING,
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  QTDEMUX_STATE_SEEKING,
  QTDEMUX_STATE_MOVIE,
  QTDEMUX_STATE_SEEKING_EOS,
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  QTDEMUX_STATE_EOS
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};

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static GNode *qtdemux_tree_get_child_by_type (GNode * node, guint32 fourcc);
static GNode *qtdemux_tree_get_sibling_by_type (GNode * node, guint32 fourcc);
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static GstElementDetails gst_qtdemux_details = {
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  "QuickTime Demuxer",
  "Codec/Demuxer",
  "Demultiplex a QuickTime file into audio and video streams",
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  "David Schleef <ds@schleef.org>"
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};

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enum
{
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  LAST_SIGNAL
};

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enum
{
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  ARG_0
};

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static GstStaticPadTemplate gst_qtdemux_sink_template =
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    GST_STATIC_PAD_TEMPLATE ("sink",
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    GST_PAD_SINK,
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    GST_PAD_ALWAYS,
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    GST_STATIC_CAPS ("video/quicktime; audio/x-m4a; application/x-3gp")
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    );
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static GstStaticPadTemplate gst_qtdemux_videosrc_template =
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GST_STATIC_PAD_TEMPLATE ("audio_%02d",
    GST_PAD_SRC,
    GST_PAD_SOMETIMES,
    GST_STATIC_CAPS_ANY);
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static GstStaticPadTemplate gst_qtdemux_audiosrc_template =
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GST_STATIC_PAD_TEMPLATE ("video_%02d",
    GST_PAD_SRC,
    GST_PAD_SOMETIMES,
    GST_STATIC_CAPS_ANY);
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static GstElementClass *parent_class = NULL;
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static void gst_qtdemux_class_init (GstQTDemuxClass * klass);
static void gst_qtdemux_base_init (GstQTDemuxClass * klass);
static void gst_qtdemux_init (GstQTDemux * quicktime_demux);
static GstElementStateReturn gst_qtdemux_change_state (GstElement * element);
static void gst_qtdemux_loop_header (GstElement * element);
static gboolean gst_qtdemux_handle_sink_event (GstQTDemux * qtdemux);

static void qtdemux_parse_moov (GstQTDemux * qtdemux, void *buffer, int length);
static void qtdemux_parse (GstQTDemux * qtdemux, GNode * node, void *buffer,
    int length);
static QtNodeType *qtdemux_type_get (guint32 fourcc);
static void qtdemux_node_dump (GstQTDemux * qtdemux, GNode * node);
static void qtdemux_parse_tree (GstQTDemux * qtdemux);
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static void qtdemux_parse_udta (GstQTDemux * qtdemux, GNode * udta);
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static void qtdemux_tag_add_str (GstQTDemux * qtdemux, const char *tag,
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    GNode * node);
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static void qtdemux_tag_add_num (GstQTDemux * qtdemux, const char *tag1,
    const char *tag2, GNode * node);
static void qtdemux_tag_add_gnre (GstQTDemux * qtdemux, const char *tag,
    GNode * node);

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static void gst_qtdemux_handle_esds (GstQTDemux * qtdemux,
    QtDemuxStream * stream, GNode * esds);
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static GstCaps *qtdemux_video_caps (GstQTDemux * qtdemux, guint32 fourcc,
    const guint8 * stsd_data);
static GstCaps *qtdemux_audio_caps (GstQTDemux * qtdemux, guint32 fourcc,
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    const guint8 * data, int len);
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static GType
gst_qtdemux_get_type (void)
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{
  static GType qtdemux_type = 0;

  if (!qtdemux_type) {
    static const GTypeInfo qtdemux_info = {
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      sizeof (GstQTDemuxClass),
      (GBaseInitFunc) gst_qtdemux_base_init, NULL,
      (GClassInitFunc) gst_qtdemux_class_init,
      NULL, NULL, sizeof (GstQTDemux), 0,
      (GInstanceInitFunc) gst_qtdemux_init,
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    };
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    qtdemux_type =
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        g_type_register_static (GST_TYPE_ELEMENT, "GstQTDemux", &qtdemux_info,
        0);
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  }
  return qtdemux_type;
}

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static void
gst_qtdemux_base_init (GstQTDemuxClass * klass)
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{
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  gst_element_class_add_pad_template (element_class,
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      gst_static_pad_template_get (&gst_qtdemux_sink_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_qtdemux_videosrc_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_qtdemux_audiosrc_template));
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  gst_element_class_set_details (element_class, &gst_qtdemux_details);
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}

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static void
gst_qtdemux_class_init (GstQTDemuxClass * klass)
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{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

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  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
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  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);

  gstelement_class->change_state = gst_qtdemux_change_state;
}

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static void
gst_qtdemux_init (GstQTDemux * qtdemux)
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{
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  qtdemux->sinkpad =
      gst_pad_new_from_template (gst_static_pad_template_get
      (&gst_qtdemux_sink_template), "sink");
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  gst_element_set_loop_function (GST_ELEMENT (qtdemux),
      gst_qtdemux_loop_header);
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  gst_element_add_pad (GST_ELEMENT (qtdemux), qtdemux->sinkpad);
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  qtdemux->last_ts = GST_CLOCK_TIME_NONE;
  qtdemux->need_discont = FALSE;
  qtdemux->need_flush = FALSE;
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}

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static const GstFormat *
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gst_qtdemux_get_src_formats (GstPad * pad)
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{
  static const GstFormat src_a_formats[] = {
    GST_FORMAT_TIME,
    GST_FORMAT_BYTES,
    GST_FORMAT_DEFAULT,
    0
  };
  static const GstFormat src_v_formats[] = {
    GST_FORMAT_TIME,
    GST_FORMAT_DEFAULT,
    0
  };
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  QtDemuxStream *stream = gst_pad_get_element_private (pad);
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  return (stream->subtype == GST_MAKE_FOURCC ('v', 'i', 'd', 'e')) ?
      src_v_formats : src_a_formats;
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}

static gboolean
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gst_qtdemux_src_convert (GstPad * pad, GstFormat src_format, gint64 src_value,
    GstFormat * dest_format, gint64 * dest_value)
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{
  gboolean res = TRUE;
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  QtDemuxStream *stream = gst_pad_get_element_private (pad);
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  if (stream->subtype == GST_MAKE_FOURCC ('v', 'i', 'd', 'e') &&
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      (src_format == GST_FORMAT_BYTES || *dest_format == GST_FORMAT_BYTES))
    return FALSE;

  switch (src_format) {
    case GST_FORMAT_TIME:
      switch (*dest_format) {
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        case GST_FORMAT_BYTES:
          *dest_value = src_value * 1;  /* FIXME */
          break;
        case GST_FORMAT_DEFAULT:
          *dest_value = src_value * 1;  /* FIXME */
          break;
        default:
          res = FALSE;
          break;
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      }
      break;
    case GST_FORMAT_BYTES:
      switch (*dest_format) {
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        case GST_FORMAT_TIME:
          *dest_value = src_value * 1;  /* FIXME */
          break;
        default:
          res = FALSE;
          break;
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      }
      break;
    case GST_FORMAT_DEFAULT:
      switch (*dest_format) {
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        case GST_FORMAT_TIME:
          *dest_value = src_value * 1;  /* FIXME */
          break;
        default:
          res = FALSE;
          break;
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      }
      break;
    default:
      res = FALSE;
  }

  return res;
}

static const GstQueryType *
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gst_qtdemux_get_src_query_types (GstPad * pad)
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{
  static const GstQueryType src_types[] = {
    GST_QUERY_TOTAL,
    GST_QUERY_POSITION,
    0
  };

  return src_types;
}

static const GstEventMask *
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gst_qtdemux_get_event_mask (GstPad * pad)
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{
  static const GstEventMask masks[] = {
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    {GST_EVENT_SEEK, GST_SEEK_METHOD_SET | GST_SEEK_FLAG_KEY_UNIT},
    {0,}
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  };

  return masks;
}

static gboolean
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gst_qtdemux_handle_src_query (GstPad * pad, GstQueryType type,
    GstFormat * format, gint64 * value)
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{
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  gboolean res = FALSE;
  GstQTDemux *qtdemux = GST_QTDEMUX (gst_pad_get_parent (pad));
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  //QtDemuxStream *stream = gst_pad_get_element_private(pad);

  switch (type) {
    case GST_QUERY_TOTAL:
      switch (*format) {
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        case GST_FORMAT_TIME:
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          if (qtdemux->duration != 0 && qtdemux->timescale != 0) {
            *value =
                (guint64) qtdemux->duration * GST_SECOND / qtdemux->timescale;
            res = TRUE;
          }
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          break;
        case GST_FORMAT_BYTES:
          *value = 0;           /* FIXME */
          break;
        case GST_FORMAT_DEFAULT:
          *value = 0;           /* FIXME */
          break;
        default:
          res = FALSE;
          break;
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      }
      break;
    case GST_QUERY_POSITION:
      switch (*format) {
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        case GST_FORMAT_TIME:
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          if (GST_CLOCK_TIME_IS_VALID (qtdemux->last_ts)) {
            *value = qtdemux->last_ts;
            res = TRUE;
          }
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          break;
        case GST_FORMAT_BYTES:
          *value = 0;           /* FIXME */
          break;
        case GST_FORMAT_DEFAULT:
          *value = 0;           /* FIXME */
          break;
        default:
          res = FALSE;
          break;
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      }
      break;
    default:
      res = FALSE;
      break;
  }

  return res;
}

static gboolean
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gst_qtdemux_handle_src_event (GstPad * pad, GstEvent * event)
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{
  gboolean res = TRUE;
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  GstQTDemux *qtdemux = GST_QTDEMUX (gst_pad_get_parent (pad));
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  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_SEEK:
      GST_DEBUG ("seek format %d", GST_EVENT_SEEK_FORMAT (event));

      switch (GST_EVENT_SEEK_FORMAT (event)) {
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        case GST_FORMAT_BYTES:
        case GST_FORMAT_DEFAULT:
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          res = FALSE;
          break;
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        case GST_FORMAT_TIME:
        {
          gint64 desired_offset = GST_EVENT_SEEK_OFFSET (event);
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          gint i = 0, n;
          QtDemuxStream *stream = gst_pad_get_element_private (pad);
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          GST_DEBUG ("seeking to %" G_GINT64_FORMAT, desired_offset);

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          if (!stream->n_samples) {
            res = FALSE;
            break;
          }

          /* resync to new time */
          for (n = 0; n < qtdemux->n_streams; n++) {
            QtDemuxStream *str = qtdemux->streams[n];

            for (i = 0; i < str->n_samples; i++) {
              if (str->samples[i].timestamp > desired_offset)
                break;
            }
            str->sample_index = i;
          }
          qtdemux->need_discont = TRUE;
          if (GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH)
            qtdemux->need_flush = TRUE;
          break;
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        }
        default:
          res = FALSE;
          break;
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      }
    default:
      res = FALSE;
      break;
  }

  gst_event_unref (event);

  return res;
}



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GST_DEBUG_CATEGORY (qtdemux_debug);

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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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  GST_DEBUG_CATEGORY_INIT (qtdemux_debug, "qtdemux", 0, "qtdemux plugin");
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  if (!gst_library_load ("gstbytestream"))
    return FALSE;

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  if (!gst_library_load ("gstgetbits"))
    return FALSE;

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  return gst_element_register (plugin, "qtdemux",
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      GST_RANK_PRIMARY, GST_TYPE_QTDEMUX);
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}

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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "qtdemux",
    "Quicktime stream demuxer",
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    plugin_init, VERSION, "LGPL", GST_PACKAGE, GST_ORIGIN);
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static gboolean
gst_qtdemux_handle_sink_event (GstQTDemux * qtdemux)
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{
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  gboolean res = TRUE;
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  guint32 remaining;
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  GstEvent *event;
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  GstEventType type;

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  gst_bytestream_get_status (qtdemux->bs, &remaining, &event);
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  type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
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  GST_DEBUG ("qtdemux: event %p %d", event, type);
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  switch (type) {
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    case GST_EVENT_EOS:
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      gst_bytestream_flush (qtdemux->bs, remaining);
      gst_pad_event_default (qtdemux->sinkpad, event);
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      return FALSE;
    case GST_EVENT_FLUSH:
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      break;
    case GST_EVENT_DISCONTINUOUS:
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      GST_DEBUG ("discontinuous event");
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      //gst_bytestream_flush_fast(qtdemux->bs, remaining);
      break;
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    default:
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      res = FALSE;
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      g_warning ("unhandled event %d", type);
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      break;
  }
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  gst_event_unref (event);
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  return res;
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}

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static GstElementStateReturn
gst_qtdemux_change_state (GstElement * element)
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{
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  GstQTDemux *qtdemux = GST_QTDEMUX (element);
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  switch (GST_STATE_TRANSITION (element)) {
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    case GST_STATE_NULL_TO_READY:
      break;
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    case GST_STATE_READY_TO_PAUSED:
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      qtdemux->bs = gst_bytestream_new (qtdemux->sinkpad);
      qtdemux->state = QTDEMUX_STATE_HEADER;
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      break;
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    case GST_STATE_PAUSED_TO_PLAYING:
      break;
    case GST_STATE_PLAYING_TO_PAUSED:
      break;
    case GST_STATE_PAUSED_TO_READY:
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      qtdemux->last_ts = GST_CLOCK_TIME_NONE;
      qtdemux->need_discont = FALSE;
      qtdemux->need_flush = FALSE;
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      gst_bytestream_destroy (qtdemux->bs);
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      break;
    case GST_STATE_READY_TO_NULL:
      break;
    default:
      break;
  }
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  return GST_ELEMENT_CLASS (parent_class)->change_state (element);
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}
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static void
gst_qtdemux_loop_header (GstElement * element)
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{
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  GstQTDemux *qtdemux = GST_QTDEMUX (element);
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  guint8 *data;
  guint32 length;
  guint32 fourcc;
  GstBuffer *buf;
  int offset;
  int cur_offset;
  int size;
  int ret;

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  /* FIXME _tell gets the offset wrong */
  //cur_offset = gst_bytestream_tell(qtdemux->bs);
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  cur_offset = qtdemux->offset;
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  GST_DEBUG ("loop at position %d", cur_offset);

  switch (qtdemux->state) {
    case QTDEMUX_STATE_HEADER:
    {
      do {
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        /* FIXME: we peek for 16 bytes, but what if the atom is smaller ? */
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        ret = gst_bytestream_peek_bytes (qtdemux->bs, &data, 16);
        if (ret < 16) {
          if (!gst_qtdemux_handle_sink_event (qtdemux)) {
            return;
          }
        } else {
          break;
        }
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      } while (1);

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      length = GST_READ_UINT32_BE (data);
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      GST_DEBUG ("length %08x", length);
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      fourcc = GST_READ_UINT32_LE (data + 4);
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      GST_DEBUG ("atom type " GST_FOURCC_FORMAT, GST_FOURCC_ARGS (fourcc));
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      if (length == 0) {
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        length = gst_bytestream_length (qtdemux->bs) - cur_offset;
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      }
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      if (length == 1) {
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        /* this means we have an extended size, which is the 64 bit value of
         * the next 8 bytes */
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        guint32 length1, length2;
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        length1 = GST_READ_UINT32_BE (data + 8);
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        GST_DEBUG ("length1 %08x", length1);
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        length2 = GST_READ_UINT32_BE (data + 12);
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        GST_DEBUG ("length2 %08x", length2);
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        /* FIXME: I guess someone didn't want to make 64 bit size work :) */
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        length = length2;
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      }

      switch (fourcc) {
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        case GST_MAKE_FOURCC ('m', 'd', 'a', 't'):
        case GST_MAKE_FOURCC ('f', 'r', 'e', 'e'):
        case GST_MAKE_FOURCC ('w', 'i', 'd', 'e'):
        case GST_MAKE_FOURCC ('P', 'I', 'C', 'T'):
        case GST_MAKE_FOURCC ('p', 'n', 'o', 't'):
          break;
        case GST_MAKE_FOURCC ('m', 'o', 'o', 'v'):
        {
          GstBuffer *moov;

          do {
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            /* read in the complete data from the moov atom */
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            ret = gst_bytestream_read (qtdemux->bs, &moov, length);
            if (ret < length) {
              GST_DEBUG ("read failed (%d < %d)", ret, length);
              if (!gst_qtdemux_handle_sink_event (qtdemux)) {
                return;
              }
            } else {
              break;
            }
          } while (1);

          qtdemux_parse_moov (qtdemux, GST_BUFFER_DATA (moov), length);
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          if (1) {
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            qtdemux_node_dump (qtdemux, qtdemux->moov_node);
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          }
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          qtdemux_parse_tree (qtdemux);
          qtdemux->state = QTDEMUX_STATE_MOVIE;
          break;
        }
        default:
        {
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          GST_LOG ("unknown %08x '" GST_FOURCC_FORMAT "' at %d",
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              fourcc, GST_FOURCC_ARGS (fourcc), cur_offset);
          break;
        }
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      }
      ret = gst_bytestream_seek (qtdemux->bs, cur_offset + length,
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          GST_SEEK_METHOD_SET);
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      if (!ret) {
        g_warning ("seek failed");
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      }
      qtdemux->offset = cur_offset + length;
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      GST_DEBUG ("seek returned %d", ret);
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      break;
    }
    case QTDEMUX_STATE_SEEKING_EOS:
    {
      guint8 *data;

      do {
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        ret = gst_bytestream_peek_bytes (qtdemux->bs, &data, 1);
        if (ret < 1) {
          if (!gst_qtdemux_handle_sink_event (qtdemux)) {
            return;
          }
        } else {
          break;
        }
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      } while (TRUE);
      gst_element_set_eos (element);
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      qtdemux->state = QTDEMUX_STATE_EOS;
      return;
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    }
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    case QTDEMUX_STATE_EOS:
      g_warning ("spinning in EOS\n");
      return;
    case QTDEMUX_STATE_MOVIE:
    {
      QtDemuxStream *stream;
      guint64 min_time;
      int index = -1;
      int i;

      min_time = G_MAXUINT64;
      for (i = 0; i < qtdemux->n_streams; i++) {
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        stream = qtdemux->streams[i];
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        if (stream->sample_index < stream->n_samples &&
            stream->samples[stream->sample_index].timestamp < min_time) {
          min_time = stream->samples[stream->sample_index].timestamp;
          index = i;
        }
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      }
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      if (index == -1) {
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        for (i = 0; i < qtdemux->n_streams; i++) {
          gst_pad_push (qtdemux->streams[i]->pad,
              GST_DATA (gst_event_new (GST_EVENT_EOS)));
        }
        ret = gst_bytestream_seek (qtdemux->bs, 0, GST_SEEK_METHOD_END);
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        if (!ret) {
          g_warning ("seek failed");
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        }
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        GST_DEBUG ("seek returned %d", ret);
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        qtdemux->state = QTDEMUX_STATE_SEEKING_EOS;
        return;
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      }

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      stream = qtdemux->streams[index];
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      offset = stream->samples[stream->sample_index].offset;
      size = stream->samples[stream->sample_index].size;
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      GST_INFO
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          ("pushing from stream %d, sample_index=%d offset=%d size=%d timestamp=%lld",
          index, stream->sample_index, offset, size,
          stream->samples[stream->sample_index].timestamp);
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      /* don't believe bytestream */
      //cur_offset = gst_bytestream_tell (qtdemux->bs);

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      if (offset != cur_offset) {
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        GST_DEBUG ("seeking to offset %d (currently at %d)", offset,
            cur_offset);
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        ret = gst_bytestream_seek (qtdemux->bs, offset, GST_SEEK_METHOD_SET);
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        if (!ret) {
          g_warning ("seek failed");
        }
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        qtdemux->offset = offset;
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        GST_DEBUG ("seek returned %d", ret);
        return;
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      }
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      GST_DEBUG ("reading %d bytes", size);
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      buf = NULL;
      do {
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        ret = gst_bytestream_read (qtdemux->bs, &buf, size);
        if (ret < size) {
          GST_DEBUG ("read failed (%d < %d)", ret, size);
          if (!gst_qtdemux_handle_sink_event (qtdemux)) {
            return;
          }
        } else {
          break;
        }
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      } while (TRUE);

      if (buf) {
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        /* hum... FIXME changing framerate breaks horribly, better set
         * an average framerate, or get rid of the framerate property. */
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        if (stream->subtype == GST_MAKE_FOURCC ('v', 'i', 'd', 'e')) {
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          //float fps =
          //   1. * GST_SECOND / stream->samples[stream->sample_index].duration;
          /*
             if (fps != stream->fps) {
             gst_caps_set_simple (stream->caps, "framerate", G_TYPE_DOUBLE, fps,
             NULL);
             stream->fps = fps;
             gst_pad_set_explicit_caps (stream->pad, stream->caps);
             }
           */
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        }

        GST_BUFFER_TIMESTAMP (buf) =
            stream->samples[stream->sample_index].timestamp;
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        qtdemux->last_ts = GST_BUFFER_TIMESTAMP (buf);
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        GST_BUFFER_DURATION (buf) =
            stream->samples[stream->sample_index].duration;
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        if (qtdemux->need_flush) {
          gst_pad_event_default (qtdemux->sinkpad,
              gst_event_new (GST_EVENT_FLUSH));
          qtdemux->need_flush = FALSE;
        }
        if (qtdemux->need_discont) {
          GstEvent *event = gst_event_new_discontinuous (FALSE,
              GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (buf),
              GST_FORMAT_UNDEFINED);
          gint n;

          qtdemux->need_discont = FALSE;
          for (n = 0; n < qtdemux->n_streams; n++) {
            gst_event_ref (event);
            gst_pad_push (qtdemux->streams[n]->pad, GST_DATA (event));
          }
          gst_event_unref (event);
        }
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        GST_DEBUG ("Pushing buf with time=%" GST_TIME_FORMAT "\n",
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            GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
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        gst_pad_push (stream->pad, GST_DATA (buf));

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        GST_INFO ("pushing buffer on %" GST_PTR_FORMAT, stream->pad);
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      }
      stream->sample_index++;
      break;
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    }
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    default:
      /* unreached */
      g_assert (0);
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  }
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}

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void
gst_qtdemux_add_stream (GstQTDemux * qtdemux, QtDemuxStream * stream)
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{
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  if (stream->subtype == GST_MAKE_FOURCC ('v', 'i', 'd', 'e')) {
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    gchar *name = g_strdup_printf ("video_%02d", qtdemux->n_video_streams);
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    stream->pad =
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        gst_pad_new_from_template (gst_static_pad_template_get
        (&gst_qtdemux_videosrc_template), name);
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    g_free (name);
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    stream->fps = 1. * GST_SECOND / stream->samples[0].duration;
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    if (stream->caps) {
      gst_caps_set_simple (stream->caps,
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          "width", G_TYPE_INT, stream->width,
          "height", G_TYPE_INT, stream->height,
          "framerate", G_TYPE_DOUBLE, stream->fps, NULL);
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    }
    qtdemux->n_video_streams++;
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  } else {
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    gchar *name = g_strdup_printf ("audio_%02d", qtdemux->n_audio_streams);
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    stream->pad =
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        gst_pad_new_from_template (gst_static_pad_template_get
        (&gst_qtdemux_audiosrc_template), name);
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    g_free (name);
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    if (stream->caps) {
      gst_caps_set_simple (stream->caps,
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          "rate", G_TYPE_INT, (int) stream->rate,
          "channels", G_TYPE_INT, stream->n_channels, NULL);
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    }
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    qtdemux->n_audio_streams++;
  }
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  gst_pad_use_explicit_caps (stream->pad);
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  GST_PAD_ELEMENT_PRIVATE (stream->pad) = stream;
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  qtdemux->streams[qtdemux->n_streams] = stream;
  qtdemux->n_streams++;
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  GST_DEBUG ("n_streams is now %d", qtdemux->n_streams);
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  gst_pad_set_event_mask_function (stream->pad, gst_qtdemux_get_event_mask);
  gst_pad_set_event_function (stream->pad, gst_qtdemux_handle_src_event);
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  gst_pad_set_query_type_function (stream->pad,
      gst_qtdemux_get_src_query_types);
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  gst_pad_set_query_function (stream->pad, gst_qtdemux_handle_src_query);
  gst_pad_set_formats_function (stream->pad, gst_qtdemux_get_src_formats);
  gst_pad_set_convert_function (stream->pad, gst_qtdemux_src_convert);

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  GST_DEBUG ("setting caps %s\n", gst_caps_to_string (stream->caps));
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  gst_pad_set_explicit_caps (stream->pad, stream->caps);
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  GST_DEBUG ("adding pad %s %p to qtdemux %p",
      gst_pad_get_name (stream->pad), stream->pad, qtdemux);
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  gst_element_add_pad (GST_ELEMENT (qtdemux), stream->pad);
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}

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#define QT_CONTAINER 1

#define FOURCC_moov	GST_MAKE_FOURCC('m','o','o','v')
#define FOURCC_mvhd	GST_MAKE_FOURCC('m','v','h','d')
#define FOURCC_clip	GST_MAKE_FOURCC('c','l','i','p')
#define FOURCC_trak	GST_MAKE_FOURCC('t','r','a','k')
#define FOURCC_udta	GST_MAKE_FOURCC('u','d','t','a')
#define FOURCC_ctab	GST_MAKE_FOURCC('c','t','a','b')
#define FOURCC_tkhd	GST_MAKE_FOURCC('t','k','h','d')
#define FOURCC_crgn	GST_MAKE_FOURCC('c','r','g','n')
#define FOURCC_matt	GST_MAKE_FOURCC('m','a','t','t')
#define FOURCC_kmat	GST_MAKE_FOURCC('k','m','a','t')
#define FOURCC_edts	GST_MAKE_FOURCC('e','d','t','s')
#define FOURCC_elst	GST_MAKE_FOURCC('e','l','s','t')
#define FOURCC_load	GST_MAKE_FOURCC('l','o','a','d')
#define FOURCC_tref	GST_MAKE_FOURCC('t','r','e','f')
#define FOURCC_imap	GST_MAKE_FOURCC('i','m','a','p')
#define FOURCC___in	GST_MAKE_FOURCC(' ',' ','i','n')
#define FOURCC___ty	GST_MAKE_FOURCC(' ',' ','t','y')
#define FOURCC_mdia	GST_MAKE_FOURCC('m','d','i','a')
#define FOURCC_mdhd	GST_MAKE_FOURCC('m','d','h','d')
#define FOURCC_hdlr	GST_MAKE_FOURCC('h','d','l','r')
#define FOURCC_minf	GST_MAKE_FOURCC('m','i','n','f')
#define FOURCC_vmhd	GST_MAKE_FOURCC('v','m','h','d')
#define FOURCC_smhd	GST_MAKE_FOURCC('s','m','h','d')
#define FOURCC_gmhd	GST_MAKE_FOURCC('g','m','h','d')
#define FOURCC_gmin	GST_MAKE_FOURCC('g','m','i','n')
#define FOURCC_dinf	GST_MAKE_FOURCC('d','i','n','f')
#define FOURCC_dref	GST_MAKE_FOURCC('d','r','e','f')
#define FOURCC_stbl	GST_MAKE_FOURCC('s','t','b','l')
#define FOURCC_stsd	GST_MAKE_FOURCC('s','t','s','d')
#define FOURCC_stts	GST_MAKE_FOURCC('s','t','t','s')
#define FOURCC_stss	GST_MAKE_FOURCC('s','t','s','s')
#define FOURCC_stsc	GST_MAKE_FOURCC('s','t','s','c')
#define FOURCC_stsz	GST_MAKE_FOURCC('s','t','s','z')
#define FOURCC_stco	GST_MAKE_FOURCC('s','t','c','o')
#define FOURCC_vide	GST_MAKE_FOURCC('v','i','d','e')
#define FOURCC_soun	GST_MAKE_FOURCC('s','o','u','n')
#define FOURCC_co64	GST_MAKE_FOURCC('c','o','6','4')
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#define FOURCC_cmov	GST_MAKE_FOURCC('c','m','o','v')
#define FOURCC_dcom	GST_MAKE_FOURCC('d','c','o','m')
#define FOURCC_cmvd	GST_MAKE_FOURCC('c','m','v','d')
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#define FOURCC_hint	GST_MAKE_FOURCC('h','i','n','t')
#define FOURCC_mp4a	GST_MAKE_FOURCC('m','p','4','a')
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#define FOURCC_mp4v	GST_MAKE_FOURCC('m','p','4','v')
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#define FOURCC_wave	GST_MAKE_FOURCC('w','a','v','e')
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#define FOURCC_appl	GST_MAKE_FOURCC('a','p','p','l')
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#define FOURCC_esds	GST_MAKE_FOURCC('e','s','d','s')
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#define FOURCC_hnti	GST_MAKE_FOURCC('h','n','t','i')
#define FOURCC_rtp_	GST_MAKE_FOURCC('r','t','p',' ')
#define FOURCC_sdp_	GST_MAKE_FOURCC('s','d','p',' ')
#define FOURCC_meta	GST_MAKE_FOURCC('m','e','t','a')
#define FOURCC_ilst	GST_MAKE_FOURCC('i','l','s','t')
#define FOURCC__nam	GST_MAKE_FOURCC(0xa9,'n','a','m')
#define FOURCC__ART	GST_MAKE_FOURCC(0xa9,'A','R','T')
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#define FOURCC__wrt	GST_MAKE_FOURCC(0xa9,'w','r','t')
#define FOURCC__grp	GST_MAKE_FOURCC(0xa9,'g','r','p')
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#define FOURCC__alb	GST_MAKE_FOURCC(0xa9,'a','l','b')
#define FOURCC_gnre	GST_MAKE_FOURCC('g','n','r','e')
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#define FOURCC_disc	GST_MAKE_FOURCC('d','i','s','c')
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#define FOURCC_trkn	GST_MAKE_FOURCC('t','r','k','n')
#define FOURCC_cpil	GST_MAKE_FOURCC('c','p','i','l')
#define FOURCC_tmpo	GST_MAKE_FOURCC('t','m','p','o')
#define FOURCC__too	GST_MAKE_FOURCC(0xa9,'t','o','o')
#define FOURCC_____	GST_MAKE_FOURCC('-','-','-','-')
#define FOURCC_free	GST_MAKE_FOURCC('f','r','e','e')
#define FOURCC_data	GST_MAKE_FOURCC('d','a','t','a')
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#define FOURCC_SVQ3	GST_MAKE_FOURCC('S','V','Q','3')
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static void qtdemux_dump_mvhd (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_tkhd (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_elst (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_mdhd (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_hdlr (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_vmhd (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_dref (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_stsd (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_stts (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_stss (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_stsc (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_stsz (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_stco (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_co64 (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_dcom (GstQTDemux * qtdemux, void *buffer, int depth);
static void qtdemux_dump_cmvd (GstQTDemux * qtdemux, void *buffer, int depth);
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static void qtdemux_dump_unknown (GstQTDemux * qtdemux, void *buffer,
    int depth);
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QtNodeType qt_node_types[] = {
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  {FOURCC_moov, "movie", QT_CONTAINER,},
  {FOURCC_mvhd, "movie header", 0,
      qtdemux_dump_mvhd},
  {FOURCC_clip, "clipping", QT_CONTAINER,},
  {FOURCC_trak, "track", QT_CONTAINER,},
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  {FOURCC_udta, "user data", QT_CONTAINER,},    /* special container */
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  {FOURCC_ctab, "color table", 0,},
  {FOURCC_tkhd, "track header", 0,
      qtdemux_dump_tkhd},
  {FOURCC_crgn, "clipping region", 0,},
  {FOURCC_matt, "track matte", QT_CONTAINER,},
  {FOURCC_kmat, "compressed matte", 0,},
  {FOURCC_edts, "edit", QT_CONTAINER,},
  {FOURCC_elst, "edit list", 0,
      qtdemux_dump_elst},
  {FOURCC_load, "track load settings", 0,},
  {FOURCC_tref, "track reference", QT_CONTAINER,},
  {FOURCC_imap, "track input map", QT_CONTAINER,},
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  {FOURCC___in, "track input", 0,},     /* special container */
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  {FOURCC___ty, "input type", 0,},
  {FOURCC_mdia, "media", QT_CONTAINER},
  {FOURCC_mdhd, "media header", 0,
      qtdemux_dump_mdhd},
  {FOURCC_hdlr, "handler reference", 0,
      qtdemux_dump_hdlr},
  {FOURCC_minf, "media information", QT_CONTAINER},
  {FOURCC_vmhd, "video media information", 0,
      qtdemux_dump_vmhd},
  {FOURCC_smhd, "sound media information", 0},
  {FOURCC_gmhd, "base media information header", 0},
  {FOURCC_gmin, "base media info", 0},
  {FOURCC_dinf, "data information", QT_CONTAINER},
  {FOURCC_dref, "data reference", 0,
      qtdemux_dump_dref},
  {FOURCC_stbl, "sample table", QT_CONTAINER},
  {FOURCC_stsd, "sample description", 0,
      qtdemux_dump_stsd},
  {FOURCC_stts, "time-to-sample", 0,
      qtdemux_dump_stts},
  {FOURCC_stss, "sync sample", 0,
      qtdemux_dump_stss},
  {FOURCC_stsc, "sample-to-chunk", 0,
      qtdemux_dump_stsc},
  {FOURCC_stsz, "sample size", 0,
      qtdemux_dump_stsz},
  {FOURCC_stco, "chunk offset", 0,
      qtdemux_dump_stco},
  {FOURCC_co64, "64-bit chunk offset", 0,
      qtdemux_dump_co64},
  {FOURCC_vide, "video media", 0},
  {FOURCC_cmov, "compressed movie", QT_CONTAINER},
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  {FOURCC_dcom, "compressed data", 0, qtdemux_dump_dcom},
  {FOURCC_cmvd, "compressed movie data", 0, qtdemux_dump_cmvd},
  {FOURCC_hint, "hint", 0,},
  {FOURCC_mp4a, "mp4a", 0,},
  {FOURCC_mp4v, "mp4v", 0,},
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  {FOURCC_wave, "wave", QT_CONTAINER},
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  {FOURCC_appl, "appl", QT_CONTAINER},
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  {FOURCC_esds, "esds", 0},
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  {FOURCC_hnti, "hnti", QT_CONTAINER},
  {FOURCC_rtp_, "rtp ", 0, qtdemux_dump_unknown},
  {FOURCC_sdp_, "sdp ", 0, qtdemux_dump_unknown},
  {FOURCC_meta, "meta", 0, qtdemux_dump_unknown},
  {FOURCC_ilst, "ilst", QT_CONTAINER,},
  {FOURCC__nam, "Name", QT_CONTAINER,},
  {FOURCC__ART, "Artist", QT_CONTAINER,},
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  {FOURCC__wrt, "Writer", QT_CONTAINER,},
  {FOURCC__grp, "Group", QT_CONTAINER,},
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  {FOURCC__alb, "Album", QT_CONTAINER,},
  {FOURCC_gnre, "Genre", QT_CONTAINER,},
  {FOURCC_trkn, "Track Number", QT_CONTAINER,},
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  {FOURCC_disc, "Disc Number", QT_CONTAINER,},
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  {FOURCC_cpil, "cpil", QT_CONTAINER,},
  {FOURCC_tmpo, "Tempo", QT_CONTAINER,},
  {FOURCC__too, "too", QT_CONTAINER,},
  {FOURCC_____, "----", QT_CONTAINER,},
  {FOURCC_data, "data", 0, qtdemux_dump_unknown},
  {FOURCC_free, "free", 0,},
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  {FOURCC_SVQ3, "SVQ3", 0,},
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  {0, "unknown", 0},
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};
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static int n_qt_node_types = sizeof (qt_node_types) / sizeof (qt_node_types[0]);
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static void *
qtdemux_zalloc (void *opaque, unsigned int items, unsigned int size)
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{
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  return g_malloc (items * size);
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}

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static void
qtdemux_zfree