gstdvdemux.c 29.8 KB
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/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 *               <2005> Wim Taymans <wim@fluendo.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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <math.h>

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#include <gst/audio/audio.h>
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#include "gstdvdemux.h"

/* DV output has two modes, normal and wide. The resolution is the same in both
 * cases: 720 pixels wide by 576 pixels tall in PAL format, and 720x480 for
 * NTSC.
 *
 * Each of the modes has its own pixel aspect ratio, which is fixed in practice
 * by ITU-R BT.601 (also known as "CCIR-601" or "Rec.601"). Or so claims a
 * reference that I culled from the reliable "internet",
 * http://www.mir.com/DMG/aspect.html. Normal PAL is 59/54 and normal NTSC is
 * 10/11. Because the pixel resolution is the same for both cases, we can get
 * the pixel aspect ratio for wide recordings by multiplying by the ratio of
 * display aspect ratios, 16/9 (for wide) divided by 4/3 (for normal):
 *
 * Wide NTSC: 10/11 * (16/9)/(4/3) = 40/33
 * Wide PAL: 59/54 * (16/9)/(4/3) = 118/81
 *
 * However, the pixel resolution coming out of a DV source does not combine with
 * the standard pixel aspect ratios to give a proper display aspect ratio. An
 * image 480 pixels tall, with a 4:3 display aspect ratio, will be 768 pixels
 * wide. But, if we take the normal PAL aspect ratio of 59/54, and multiply it
 * with the width of the DV image (720 pixels), we get 786.666..., which is
 * nonintegral and too wide. The camera is not outputting a 4:3 image.
 * 
 * If the video sink for this stream has fixed dimensions (such as for
 * fullscreen playback, or for a java applet in a web page), you then have two
 * choices. Either you show the whole image, but pad the image with black
 * borders on the top and bottom (like watching a widescreen video on a 4:3
 * device), or you crop the video to the proper ratio. Apparently the latter is
 * the standard practice.
 *
 * For its part, GStreamer is concerned with accuracy and preservation of
 * information. This element outputs the 720x576 or 720x480 video that it
 * recieves, noting the proper aspect ratio. This should not be a problem for
 * windowed applications, which can change size to fit the video. Applications
 * with fixed size requirements should decide whether to crop or pad which
 * an element such as videobox can do.
 */

#define NTSC_HEIGHT 480
#define NTSC_BUFFER 120000
#define NTSC_FRAMERATE 30000/1001.

#define PAL_HEIGHT 576
#define PAL_BUFFER 144000
#define PAL_FRAMERATE 25.0

#define PAL_NORMAL_PAR_X	59
#define PAL_NORMAL_PAR_Y	54
#define PAL_WIDE_PAR_X		118
#define PAL_WIDE_PAR_Y		81

#define NTSC_NORMAL_PAR_X	10
#define NTSC_NORMAL_PAR_Y	11
#define NTSC_WIDE_PAR_X		40
#define NTSC_WIDE_PAR_Y		33

static GstElementDetails dvdemux_details =
GST_ELEMENT_DETAILS ("DV system stream demuxer",
    "Codec/Demuxer",
    "Uses libdv to separate DV audio from DV video",
    "Erik Walthinsen <omega@cse.ogi.edu>, Wim Taymans <wim@fluendo.com>");

static GstStaticPadTemplate sink_temp = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("video/x-dv, systemstream = (boolean) true")
    );

static GstStaticPadTemplate video_src_temp = GST_STATIC_PAD_TEMPLATE ("video",
    GST_PAD_SRC,
    GST_PAD_SOMETIMES,
    GST_STATIC_CAPS ("video/x-dv, systemstream = (boolean) false")
    );

static GstStaticPadTemplate audio_src_temp = GST_STATIC_PAD_TEMPLATE ("audio",
    GST_PAD_SRC,
    GST_PAD_SOMETIMES,
    GST_STATIC_CAPS ("audio/x-raw-int, "
        "depth = (int) 16, "
        "width = (int) 16, "
        "signed = (boolean) TRUE, "
        "channels = (int) {2, 4}, "
        "endianness = (int) " G_STRINGIFY (G_BYTE_ORDER) ", "
        "rate = (int) { 32000, 44100, 48000 }")
    );


GST_BOILERPLATE (GstDVDemux, gst_dvdemux, GstElement, GST_TYPE_ELEMENT);


static const GstQueryType *gst_dvdemux_get_src_query_types (GstPad * pad);
static gboolean gst_dvdemux_src_query (GstPad * pad, GstQuery * query);
static const GstQueryType *gst_dvdemux_get_sink_query_types (GstPad * pad);
static gboolean gst_dvdemux_sink_query (GstPad * pad, GstQuery * query);

static gboolean gst_dvdemux_sink_convert (GstPad * pad, GstFormat src_format,
    gint64 src_value, GstFormat * dest_format, gint64 * dest_value);
static gboolean gst_dvdemux_src_convert (GstPad * pad, GstFormat src_format,
    gint64 src_value, GstFormat * dest_format, gint64 * dest_value);

static gboolean gst_dvdemux_handle_src_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_dvdemux_flush (GstDVDemux * dvdemux);
static GstFlowReturn gst_dvdemux_chain (GstPad * pad, GstBuffer * buffer);
static gboolean gst_dvdemux_handle_sink_event (GstPad * pad, GstEvent * event);

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static GstStateChangeReturn gst_dvdemux_change_state (GstElement * element,
    GstStateChange transition);
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static void
gst_dvdemux_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&sink_temp));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&video_src_temp));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&audio_src_temp));

  gst_element_class_set_details (element_class, &dvdemux_details);
}

static void
gst_dvdemux_class_init (GstDVDemuxClass * klass)
{
  GstElementClass *gstelement_class;

  gstelement_class = (GstElementClass *) klass;

  gstelement_class->change_state = gst_dvdemux_change_state;

  /* table initialization, only do once */
  dv_init (0, 0);
}

static void
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gst_dvdemux_init (GstDVDemux * dvdemux, GstDVDemuxClass * g_class)
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{
  gint i;

  dvdemux->sinkpad =
      gst_pad_new_from_template (gst_static_pad_template_get (&sink_temp),
      "sink");
  gst_pad_set_chain_function (dvdemux->sinkpad, gst_dvdemux_chain);
  gst_pad_set_event_function (dvdemux->sinkpad, gst_dvdemux_handle_sink_event);
  gst_pad_set_query_function (dvdemux->sinkpad,
      GST_DEBUG_FUNCPTR (gst_dvdemux_sink_query));
  gst_pad_set_query_type_function (dvdemux->sinkpad,
      GST_DEBUG_FUNCPTR (gst_dvdemux_get_sink_query_types));
  gst_element_add_pad (GST_ELEMENT (dvdemux), dvdemux->sinkpad);

  dvdemux->adapter = gst_adapter_new ();

  dvdemux->timestamp = 0LL;

  dvdemux->start_timestamp = -1LL;
  dvdemux->stop_timestamp = -1LL;
  dvdemux->need_discont = FALSE;
  dvdemux->new_media = FALSE;
  dvdemux->framerate = 0;
  dvdemux->height = 0;
  dvdemux->frequency = 0;
  dvdemux->channels = 0;
  dvdemux->wide = FALSE;

  for (i = 0; i < 4; i++) {
    dvdemux->audio_buffers[i] =
        (gint16 *) g_malloc (DV_AUDIO_MAX_SAMPLES * sizeof (gint16));
  }
}

static void
gst_dvdemux_add_pads (GstDVDemux * dvdemux)
{
  dvdemux->videosrcpad =
      gst_pad_new_from_template (gst_static_pad_template_get (&video_src_temp),
      "video");
  gst_pad_set_query_function (dvdemux->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_dvdemux_src_query));
  gst_pad_set_query_type_function (dvdemux->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_dvdemux_get_src_query_types));
  gst_pad_set_event_function (dvdemux->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_dvdemux_handle_src_event));
  gst_pad_use_fixed_caps (dvdemux->videosrcpad);
  gst_element_add_pad (GST_ELEMENT (dvdemux), dvdemux->videosrcpad);

  dvdemux->audiosrcpad =
      gst_pad_new_from_template (gst_static_pad_template_get (&audio_src_temp),
      "audio");
  gst_pad_set_query_function (dvdemux->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_dvdemux_src_query));
  gst_pad_set_query_type_function (dvdemux->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_dvdemux_get_src_query_types));
  gst_pad_set_event_function (dvdemux->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_dvdemux_handle_src_event));
  gst_pad_use_fixed_caps (dvdemux->audiosrcpad);
  gst_element_add_pad (GST_ELEMENT (dvdemux), dvdemux->audiosrcpad);
}

static gboolean
gst_dvdemux_src_convert (GstPad * pad, GstFormat src_format, gint64 src_value,
    GstFormat * dest_format, gint64 * dest_value)
{
  gboolean res = TRUE;
  GstDVDemux *dvdemux;

  dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
  if (dvdemux->frame_len == -1)
    goto error;

  if (dvdemux->decoder == NULL)
    goto error;

  if (*dest_format == src_format) {
    *dest_value = src_value;
    goto done;
  }

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  GST_INFO ("src_value:%lld, src_format:%d, dest_format:%d", src_value,
      src_format, *dest_format);

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  switch (src_format) {
    case GST_FORMAT_BYTES:
      switch (*dest_format) {
        case GST_FORMAT_DEFAULT:
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          if (pad == dvdemux->videosrcpad)
            *dest_value = src_value / dvdemux->frame_len;
          else if (pad == dvdemux->audiosrcpad)
            *dest_value = src_value / gst_audio_frame_byte_size (pad);
          break;
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        case GST_FORMAT_TIME:
          *dest_format = GST_FORMAT_TIME;
          if (pad == dvdemux->videosrcpad)
            *dest_value = src_value * GST_SECOND /
                (dvdemux->frame_len * dvdemux->framerate);
          else if (pad == dvdemux->audiosrcpad)
            *dest_value = src_value * GST_SECOND /
                (2 * dvdemux->frequency * dvdemux->channels);
          break;
        default:
          res = FALSE;
      }
      break;
    case GST_FORMAT_TIME:
      switch (*dest_format) {
        case GST_FORMAT_BYTES:
          if (pad == dvdemux->videosrcpad)
            *dest_value = src_value * dvdemux->frame_len * dvdemux->framerate
                / GST_SECOND;
          else if (pad == dvdemux->audiosrcpad)
            *dest_value = 2 * src_value * dvdemux->frequency *
                dvdemux->channels / GST_SECOND;
          break;
        case GST_FORMAT_DEFAULT:
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          if (pad == dvdemux->videosrcpad) {
            if (src_value)
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              *dest_value = src_value * dvdemux->framerate / GST_SECOND;
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            else
              *dest_value = 0;
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          } else if (pad == dvdemux->audiosrcpad) {
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            *dest_value = 2 * src_value * dvdemux->frequency *
                dvdemux->channels / (GST_SECOND *
                gst_audio_frame_byte_size (pad));
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          }
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          break;
        default:
          res = FALSE;
      }
      break;
    case GST_FORMAT_DEFAULT:
      switch (*dest_format) {
        case GST_FORMAT_TIME:
          if (pad == dvdemux->videosrcpad) {
            *dest_value = src_value * GST_SECOND * dvdemux->framerate;
          } else if (pad == dvdemux->audiosrcpad) {
            if (src_value)
              *dest_value =
                  src_value * GST_SECOND * gst_audio_frame_byte_size (pad)
                  / (2 * dvdemux->frequency * dvdemux->channels);
            else
              *dest_value = 0;
          }
          break;
        case GST_FORMAT_BYTES:
          if (pad == dvdemux->videosrcpad) {
            *dest_value = src_value * dvdemux->frame_len;
          } else if (pad == dvdemux->audiosrcpad) {
            *dest_value = src_value * gst_audio_frame_byte_size (pad);
          }
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          break;
        default:
          res = FALSE;
      }
      break;
    default:
      res = FALSE;
  }

done:
  gst_object_unref (dvdemux);

  return res;

error:
  {
    gst_object_unref (dvdemux);
    return FALSE;
  }
}

static gboolean
gst_dvdemux_sink_convert (GstPad * pad, GstFormat src_format, gint64 src_value,
    GstFormat * dest_format, gint64 * dest_value)
{
  gboolean res = TRUE;
  GstDVDemux *dvdemux;

  dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));

  if (dvdemux->frame_len <= 0)
    goto error;

  GST_DEBUG ("%d -> %d", src_format, *dest_format);

  if (*dest_format == GST_FORMAT_DEFAULT)
    *dest_format = GST_FORMAT_TIME;

  if (*dest_format == src_format) {
    *dest_value = src_value;
    goto done;
  }

  switch (src_format) {
    case GST_FORMAT_BYTES:
      switch (*dest_format) {
        case GST_FORMAT_TIME:
        {
          guint64 frame;

          /* get frame number */
          frame = src_value / dvdemux->frame_len;

          *dest_value = (frame * GST_SECOND) / dvdemux->framerate;
          break;
        }
        default:
          res = FALSE;
      }
      break;
    case GST_FORMAT_TIME:
      switch (*dest_format) {
        case GST_FORMAT_BYTES:
        {
          guint64 frame;

          /* calculate the frame */
          frame = src_value * dvdemux->framerate / GST_SECOND;
          /* calculate the offset */
          *dest_value = frame * dvdemux->frame_len;
          break;
        }
        default:
          res = FALSE;
      }
      break;
    default:
      res = FALSE;
  }

done:
  gst_object_unref (dvdemux);
  return res;

error:
  {
    gst_object_unref (dvdemux);
    return FALSE;
  }
}

static const GstQueryType *
gst_dvdemux_get_src_query_types (GstPad * pad)
{
  static const GstQueryType src_query_types[] = {
    GST_QUERY_POSITION,
    GST_QUERY_CONVERT,
    0
  };

  return src_query_types;
}

static gboolean
gst_dvdemux_src_query (GstPad * pad, GstQuery * query)
{
  gboolean res = TRUE;
  GstDVDemux *dvdemux;

  dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_POSITION:
    {
      GstFormat format;
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      GstFormat format2;
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      gint64 cur, end;
      GstPad *peer;

      /* get target format */
      gst_query_parse_position (query, &format, NULL, NULL);

      /* change query to perform on peer */
      gst_query_set_position (query, GST_FORMAT_BYTES, -1, -1);

      if ((peer = gst_pad_get_peer (dvdemux->sinkpad))) {
        /* ask peer for total length */
        if (!(res = gst_pad_query (peer, query))) {
          gst_object_unref (peer);
          goto error;
        }

        /* get peer total length */
        gst_query_parse_position (query, NULL, NULL, &end);

        /* convert end to requested format */
        if (end != -1) {
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          format2 = format;
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          if (!(res = gst_pad_query_convert (dvdemux->sinkpad,
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                      GST_FORMAT_BYTES, end, &format2, &end))) {
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            gst_object_unref (peer);
            goto error;
          }
        }
        gst_object_unref (peer);
      } else {
        end = -1;
      }
      /* bring the position to the requested format. */
      if (!(res = gst_pad_query_convert (pad,
                  GST_FORMAT_TIME, dvdemux->timestamp, &format, &cur)))
        goto error;
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      if (!(res = gst_pad_query_convert (pad, format2, end, &format, &end)))
        goto error;
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      gst_query_set_position (query, format, cur, end);
      break;
    }
    case GST_QUERY_CONVERT:
    {
      GstFormat src_fmt, dest_fmt;
      gint64 src_val, dest_val;

      gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
      if (!(res =
              gst_dvdemux_src_convert (pad, src_fmt, src_val, &dest_fmt,
                  &dest_val)))
        goto error;
      gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
      break;
    }
    default:
      res = FALSE;
      break;
  }
  gst_object_unref (dvdemux);

  return res;

error:
  {
    gst_object_unref (dvdemux);
    GST_DEBUG ("error handling event");
    return FALSE;
  }
}

static const GstQueryType *
gst_dvdemux_get_sink_query_types (GstPad * pad)
{
  static const GstQueryType sink_query_types[] = {
    GST_QUERY_CONVERT,
    0
  };

  return sink_query_types;
}

static gboolean
gst_dvdemux_sink_query (GstPad * pad, GstQuery * query)
{
  gboolean res = TRUE;
  GstDVDemux *dvdemux;

  dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_CONVERT:
    {
      GstFormat src_fmt, dest_fmt;
      gint64 src_val, dest_val;

      gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
      if (!(res =
              gst_dvdemux_sink_convert (pad, src_fmt, src_val, &dest_fmt,
                  &dest_val)))
        goto error;
      gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
      break;
    }
    default:
      res = FALSE;
      break;
  }
  gst_object_unref (dvdemux);

  return res;

error:
  {
    gst_object_unref (dvdemux);
    GST_DEBUG ("error handling event");
    return FALSE;
  }
}

static gboolean
gst_dvdemux_send_event (GstDVDemux * dvdemux, GstEvent * event)
{
  gboolean res = FALSE;

  gst_event_ref (event);
  if (dvdemux->videosrcpad)
    res |= gst_pad_push_event (dvdemux->videosrcpad, event);
  if (dvdemux->audiosrcpad)
    res |= gst_pad_push_event (dvdemux->audiosrcpad, event);

  return res;
}

static gboolean
gst_dvdemux_handle_sink_event (GstPad * pad, GstEvent * event)
{
  GstDVDemux *dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
  gboolean res = TRUE;

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_FLUSH_START:
      /* we are not blocking on anything exect the push() calls
       * to the peer which will be unblocked by forwarding the
       * event.*/
      res = gst_dvdemux_send_event (dvdemux, event);

      /* and wait till streaming stops, not strictly needed as
       * the peer calling us will do the same. */
      GST_STREAM_LOCK (pad);
      GST_STREAM_UNLOCK (pad);
      break;
    case GST_EVENT_FLUSH_STOP:
      GST_STREAM_LOCK (pad);
      gst_adapter_clear (dvdemux->adapter);
      GST_DEBUG ("cleared adapter");
      res = gst_dvdemux_send_event (dvdemux, event);
      GST_STREAM_UNLOCK (pad);
      break;
    case GST_EVENT_NEWSEGMENT:
    {
      GstFormat format;

      GST_STREAM_LOCK (pad);

      /* parse byte start and stop positions */
      gst_event_parse_newsegment (event, NULL, &format,
          &dvdemux->start_byte, &dvdemux->stop_byte, NULL);

      /* and queue a DISCONT before sending the next set of buffers */
      dvdemux->need_discont = TRUE;
      gst_event_unref (event);
      GST_STREAM_UNLOCK (pad);
      break;
    }
    case GST_EVENT_EOS:
    default:
      GST_STREAM_LOCK (pad);
      /* flush any pending data */
      gst_dvdemux_flush (dvdemux);
      /* forward event */
      res = gst_dvdemux_send_event (dvdemux, event);
      /* and clear the adapter */
      gst_adapter_clear (dvdemux->adapter);
      GST_STREAM_UNLOCK (pad);
      break;
  }

  gst_object_unref (dvdemux);

  return res;
}

static gboolean
gst_dvdemux_handle_src_event (GstPad * pad, GstEvent * event)
{
  gboolean res = TRUE;
  GstDVDemux *dvdemux;

  dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_SEEK:
    {
      GstEvent *newevent;
      gint64 offset;
      GstFormat format, conv;
      gint64 cur, stop;
      gdouble rate;
      GstSeekType cur_type, stop_type;
      GstSeekFlags flags;
      gint64 start_position, end_position;

      gst_event_parse_seek (event, &rate, &format, &flags,
          &cur_type, &cur, &stop_type, &stop);

      if ((offset = cur) != -1) {
        /* bring the format to time on srcpad. */
        conv = GST_FORMAT_TIME;
        if (!(res = gst_pad_query_convert (pad,
                    format, offset, &conv, &start_position))) {
          /* could not convert seek format to time offset */
          break;
        }
        /* and convert to bytes on sinkpad. */
        conv = GST_FORMAT_BYTES;
        if (!(res = gst_pad_query_convert (dvdemux->sinkpad,
                    GST_FORMAT_TIME, start_position, &conv, &start_position))) {
          /* could not convert time format to bytes offset */
          break;
        }
      } else {
        start_position = -1;
      }

      if ((offset = stop) != -1) {
        /* bring the format to time on srcpad. */
        conv = GST_FORMAT_TIME;
        if (!(res = gst_pad_query_convert (pad,
                    format, offset, &conv, &end_position))) {
          /* could not convert seek format to time offset */
          break;
        }
        conv = GST_FORMAT_BYTES;
        /* and convert to bytes on sinkpad. */
        if (!(res = gst_pad_query_convert (dvdemux->sinkpad,
                    GST_FORMAT_TIME, end_position, &conv, &end_position))) {
          /* could not convert seek format to bytes offset */
          break;
        }
      } else {
        end_position = -1;
      }
      /* now this is the updated seek event on bytes */
      newevent = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
          cur_type, start_position, stop_type, end_position);

      res = gst_pad_push_event (dvdemux->sinkpad, newevent);
      break;
    }
    default:
      res = FALSE;
      break;
  }
  gst_event_unref (event);

  gst_object_unref (dvdemux);

  return res;
}

static GstFlowReturn
gst_dvdemux_demux_audio (GstDVDemux * dvdemux, const guint8 * data)
{
  gint num_samples;
  gint frequency, channels;
  GstFlowReturn ret;

  frequency = dv_get_frequency (dvdemux->decoder);
  channels = dv_get_num_channels (dvdemux->decoder);

  /* check if format changed */
  if ((frequency != dvdemux->frequency) || (channels != dvdemux->channels)) {
    GstCaps *caps;

    dvdemux->frequency = frequency;
    dvdemux->channels = channels;

    /* and set new caps */
    caps = gst_caps_new_simple ("audio/x-raw-int",
        "rate", G_TYPE_INT, frequency,
        "depth", G_TYPE_INT, 16,
        "width", G_TYPE_INT, 16,
        "signed", G_TYPE_BOOLEAN, TRUE,
        "channels", G_TYPE_INT, channels,
        "endianness", G_TYPE_INT, G_BYTE_ORDER, NULL);
    gst_pad_set_caps (dvdemux->audiosrcpad, caps);
    gst_caps_unref (caps);
  }

  dv_decode_full_audio (dvdemux->decoder, data, dvdemux->audio_buffers);

  if ((num_samples = dv_get_num_samples (dvdemux->decoder)) > 0) {
    gint16 *a_ptr;
    gint i, j;
    GstBuffer *outbuf;

    outbuf = gst_buffer_new_and_alloc (num_samples *
        sizeof (gint16) * dvdemux->channels);

    a_ptr = (gint16 *) GST_BUFFER_DATA (outbuf);

    for (i = 0; i < num_samples; i++) {
      for (j = 0; j < dvdemux->channels; j++) {
        *(a_ptr++) = dvdemux->audio_buffers[j][i];
      }
    }

    GST_DEBUG ("pushing audio %" GST_TIME_FORMAT,
        GST_TIME_ARGS (dvdemux->timestamp));

    GST_BUFFER_TIMESTAMP (outbuf) = dvdemux->timestamp;
    GST_BUFFER_DURATION (outbuf) = dvdemux->duration;
    GST_BUFFER_OFFSET (outbuf) = dvdemux->audio_offset;
    dvdemux->audio_offset += num_samples;
    GST_BUFFER_OFFSET_END (outbuf) = dvdemux->audio_offset;

    gst_buffer_set_caps (outbuf, GST_PAD_CAPS (dvdemux->audiosrcpad));

    ret = gst_pad_push (dvdemux->audiosrcpad, outbuf);
  } else {
    /* no samples */
    ret = GST_FLOW_OK;
  }

  return ret;
}

static GstFlowReturn
gst_dvdemux_demux_video (GstDVDemux * dvdemux, const guint8 * data)
{
  GstBuffer *outbuf;
  gint height;
  gboolean wide;
  GstFlowReturn ret = GST_FLOW_OK;

  /* get params */
  /* framerate is already up-to-date */
  height = (dvdemux->PAL ? PAL_HEIGHT : NTSC_HEIGHT);
  wide = dv_format_wide (dvdemux->decoder);

  /* see if anything changed */
  if ((dvdemux->height != height) || dvdemux->wide != wide) {
    GstCaps *caps;
    gint par_x, par_y;

    dvdemux->height = height;
    dvdemux->wide = wide;

    if (dvdemux->PAL) {
      if (wide) {
        par_x = PAL_WIDE_PAR_X;
        par_y = PAL_WIDE_PAR_Y;
      } else {
        par_x = PAL_NORMAL_PAR_X;
        par_y = PAL_NORMAL_PAR_Y;
      }
    } else {
      if (wide) {
        par_x = NTSC_WIDE_PAR_X;
        par_y = NTSC_WIDE_PAR_Y;
      } else {
        par_x = NTSC_NORMAL_PAR_X;
        par_y = NTSC_NORMAL_PAR_Y;
      }
    }

    caps = gst_caps_new_simple ("video/x-dv",
        "systemstream", G_TYPE_BOOLEAN, FALSE,
        "width", G_TYPE_INT, 720,
        "height", G_TYPE_INT, height,
        "framerate", G_TYPE_DOUBLE, dvdemux->framerate,
        "pixel-aspect-ratio", GST_TYPE_FRACTION, par_x, par_y, NULL);
    gst_pad_set_caps (dvdemux->videosrcpad, caps);
    gst_caps_unref (caps);
  }

  outbuf = gst_buffer_new ();

  gst_buffer_set_data (outbuf, (guint8 *) data, dvdemux->frame_len);
825
  outbuf->malloc_data = GST_BUFFER_DATA (outbuf);
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864

  GST_BUFFER_TIMESTAMP (outbuf) = dvdemux->timestamp;
  GST_BUFFER_OFFSET (outbuf) = dvdemux->video_offset;
  GST_BUFFER_OFFSET_END (outbuf) = dvdemux->video_offset + 1;
  GST_BUFFER_DURATION (outbuf) = dvdemux->duration;

  gst_buffer_set_caps (outbuf, GST_PAD_CAPS (dvdemux->videosrcpad));

  GST_DEBUG ("pushing video %" GST_TIME_FORMAT,
      GST_TIME_ARGS (dvdemux->timestamp));

  ret = gst_pad_push (dvdemux->videosrcpad, outbuf);

  dvdemux->video_offset++;

  return ret;
}

static GstFlowReturn
gst_dvdemux_demux_frame (GstDVDemux * dvdemux, const guint8 * data)
{
  GstClockTime next_ts;
  GstFlowReturn aret, vret, ret;

  if (dvdemux->need_discont) {
    GstEvent *event;
    GstFormat format;
    gboolean res;

    /* convert to time and store as start/end_timestamp */
    format = GST_FORMAT_TIME;
    if (!(res = gst_pad_query_convert (dvdemux->sinkpad,
                GST_FORMAT_BYTES,
                dvdemux->start_byte, &format, &dvdemux->start_timestamp))) {
      goto discont_error;
    }

    dvdemux->timestamp = dvdemux->start_timestamp;

865 866 867 868 869 870 871 872 873
    if (dvdemux->stop_byte == -1) {
      dvdemux->stop_timestamp = -1;
    } else {
      format = GST_FORMAT_TIME;
      if (!(res = gst_pad_query_convert (dvdemux->sinkpad,
                  GST_FORMAT_BYTES,
                  dvdemux->stop_byte, &format, &dvdemux->stop_timestamp))) {
        goto discont_error;
      }
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944
    }

    event = gst_event_new_newsegment (1.0, GST_FORMAT_TIME,
        dvdemux->start_timestamp, dvdemux->stop_timestamp, 0);
    gst_dvdemux_send_event (dvdemux, event);

    dvdemux->need_discont = FALSE;
  }

  next_ts = dvdemux->timestamp + GST_SECOND / dvdemux->framerate;
  dvdemux->duration = next_ts - dvdemux->timestamp;

  dv_parse_packs (dvdemux->decoder, data);
  if (dv_is_new_recording (dvdemux->decoder, data))
    dvdemux->new_media = TRUE;

  aret = ret = gst_dvdemux_demux_audio (dvdemux, data);
  if (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED)
    goto done;

  vret = ret = gst_dvdemux_demux_video (dvdemux, data);
  if (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED)
    goto done;

  if (aret == GST_FLOW_NOT_LINKED && vret == GST_FLOW_NOT_LINKED) {
    ret = GST_FLOW_NOT_LINKED;
    goto done;
  }

  ret = GST_FLOW_OK;
  dvdemux->timestamp = next_ts;

done:
  return ret;

discont_error:
  {
    GST_DEBUG ("error generating discont event");
    return GST_FLOW_ERROR;
  }
}

/* flush any remaining data in the adapter */
static GstFlowReturn
gst_dvdemux_flush (GstDVDemux * dvdemux)
{
  GstFlowReturn ret = GST_FLOW_OK;

  while (gst_adapter_available (dvdemux->adapter) >= dvdemux->frame_len) {
    const guint8 *data;
    gint length;

    /* get the accumulated bytes */
    data = gst_adapter_peek (dvdemux->adapter, dvdemux->frame_len);

    /* parse header to know the length and other params */
    if (dv_parse_header (dvdemux->decoder, data) < 0)
      goto parse_header_error;

    dvdemux->found_header = TRUE;

    /* after parsing the header we know the length of the data */
    dvdemux->PAL = dv_system_50_fields (dvdemux->decoder);
    length = dvdemux->frame_len = (dvdemux->PAL ? PAL_BUFFER : NTSC_BUFFER);
    dvdemux->framerate = dvdemux->PAL ? PAL_FRAMERATE : NTSC_FRAMERATE;
    /* let demux_video set the height, it needs to detect when things change so
     * it can reset caps */

    /* if we still have enough for a frame, start decoding */
    if (gst_adapter_available (dvdemux->adapter) >= length) {

945
      data = gst_adapter_take (dvdemux->adapter, length);
946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979

      /* and decode the data */
      ret = gst_dvdemux_demux_frame (dvdemux, data);

      if (ret != GST_FLOW_OK)
        goto done;
    }
  }
done:
  return ret;

  /* ERRORS */
parse_header_error:
  {
    GST_ELEMENT_ERROR (dvdemux, STREAM, DECODE,
        ("Error parsing DV header"), ("Error parsing DV header"));
    gst_object_unref (dvdemux);

    return GST_FLOW_ERROR;
  }
}

/* streaming operation: 
 *
 * accumulate data until we have a frame, then decode. 
 */
static GstFlowReturn
gst_dvdemux_chain (GstPad * pad, GstBuffer * buffer)
{
  GstDVDemux *dvdemux;
  GstFlowReturn ret;

  dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));

980 981 982 983
  /* temporary hack? Can't do this from the state change */
  if (!dvdemux->videosrcpad)
    gst_dvdemux_add_pads (dvdemux);

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  gst_adapter_push (dvdemux->adapter, buffer);

  /* Apparently dv_parse_header can read from the body of the frame
   * too, so it needs more than header_size bytes. Wacky!
   */
  if (dvdemux->frame_len == -1) {
    /* if we don't know the length of a frame, we assume it is
     * the NTSC_BUFFER length, as this is enough to figure out 
     * if this is PAL or NTSC */
    dvdemux->frame_len = NTSC_BUFFER;
  }

  /* and try to flush pending frames */
  ret = gst_dvdemux_flush (dvdemux);

  gst_object_unref (dvdemux);

  return ret;
}

1004 1005
static GstStateChangeReturn
gst_dvdemux_change_state (GstElement * element, GstStateChange transition)
1006 1007
{
  GstDVDemux *dvdemux = GST_DVDEMUX (element);
1008
  GstStateChangeReturn ret;
1009 1010 1011


  switch (transition) {
1012
    case GST_STATE_CHANGE_NULL_TO_READY:
1013
      break;
1014
    case GST_STATE_CHANGE_READY_TO_PAUSED:
1015 1016 1017 1018 1019 1020 1021
      dvdemux->decoder = dv_decoder_new (0, FALSE, FALSE);
      dvdemux->audio_offset = 0;
      dvdemux->video_offset = 0;
      dvdemux->framecount = 0;
      dvdemux->found_header = FALSE;
      dvdemux->frame_len = -1;
      break;
1022
    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
1023 1024 1025 1026 1027
      break;
    default:
      break;
  }

1028
  ret = parent_class->change_state (element, transition);
1029 1030

  switch (transition) {
1031
    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
1032
      break;
1033
    case GST_STATE_CHANGE_PAUSED_TO_READY:
1034 1035 1036 1037
      gst_adapter_clear (dvdemux->adapter);
      dv_decoder_free (dvdemux->decoder);
      dvdemux->decoder = NULL;
      break;
1038
    case GST_STATE_CHANGE_READY_TO_NULL:
1039 1040 1041 1042 1043 1044
      break;
    default:
      break;
  }
  return ret;
}