+/* 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>
+
+#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);
+
+static GstElementStateReturn gst_dvdemux_change_state (GstElement * element);
+
+
+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
+gst_dvdemux_init (GstDVDemux * dvdemux)
+{
+ 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;
+ }
+
+ switch (src_format) {
+ case GST_FORMAT_BYTES:
+ switch (*dest_format) {
+ case GST_FORMAT_BYTES:
+ *dest_value = src_value;
+ break;
+ case GST_FORMAT_DEFAULT:
+ 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_TIME:
+ case GST_FORMAT_DEFAULT:
+ *dest_format = GST_FORMAT_TIME;
+ *dest_value = src_value;
+ 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;
+ 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) {
+ if (!(res = gst_pad_query_convert (dvdemux->sinkpad,
+ GST_FORMAT_BYTES, end, &format, &end))) {
+ 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;
+
+ 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 ();
+
+ /* won't get freed, but still callers should not hold a ref on the buffer --
+ need to figure out how to do that in gst core */
+ gst_buffer_set_data (outbuf, (guint8 *) data, dvdemux->frame_len);
+
+ 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;
+
+ 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;
+ }
+
+ 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) {
+
+ data = gst_adapter_peek (dvdemux->adapter, length);
+
+ /* and decode the data */
+ ret = gst_dvdemux_demux_frame (dvdemux, data);
+
+ gst_adapter_flush (dvdemux->adapter, length);
+
+ 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));
+
+ 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;
+}
+
+static GstElementStateReturn
+gst_dvdemux_change_state (GstElement * element)
+{
+ GstDVDemux *dvdemux = GST_DVDEMUX (element);
+ GstElementStateReturn ret;
+ gint transition;
+
+ transition = GST_STATE_TRANSITION (element);
+
+ switch (transition) {
+ case GST_STATE_NULL_TO_READY:
+ if (!dvdemux->videosrcpad)
+ gst_dvdemux_add_pads (dvdemux);
+ break;
+ case GST_STATE_READY_TO_PAUSED:
+ 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;
+ case GST_STATE_PAUSED_TO_PLAYING:
+ break;
+ default:
+ break;
+ }
+
+ ret = parent_class->change_state (element);
+
+ switch (transition) {
+ case GST_STATE_PLAYING_TO_PAUSED:
+ break;
+ case GST_STATE_PAUSED_TO_READY:
+ gst_adapter_clear (dvdemux->adapter);
+ dv_decoder_free (dvdemux->decoder);
+ dvdemux->decoder = NULL;
+ break;
+ case GST_STATE_READY_TO_NULL:
+ break;
+ default:
+ break;
+ }
+ return ret;
+}