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gstreamer/ext/dv/gstdvdemux.c
Thomas Vander Stichele 3ecf433432 expand tabs 
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2005-12-06 19:44:58 +00:00

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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>
#include <gst/audio/audio.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_NUMERATOR 30000
#define NTSC_FRAMERATE_DENOMINATOR 1001
#define PAL_HEIGHT 576
#define PAL_BUFFER 144000
#define PAL_FRAMERATE_NUMERATOR 25
#define PAL_FRAMERATE_DENOMINATOR 1
#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 GstStateChangeReturn gst_dvdemux_change_state (GstElement * element,
GstStateChange transition);
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, GstDVDemuxClass * g_class)
{
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_numerator = 0;
dvdemux->framerate_denominator = 0;
dvdemux->total_frames = 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);
gst_element_no_more_pads (GST_ELEMENT (dvdemux));
}
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;
}
GST_INFO ("pad:%s:%s, src_value:%lld, src_format:%d, dest_format:%d",
GST_DEBUG_PAD_NAME (pad), src_value, src_format, *dest_format);
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
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;
case GST_FORMAT_TIME:
*dest_format = GST_FORMAT_TIME;
if (pad == dvdemux->videosrcpad)
*dest_value = src_value * GST_SECOND *
dvdemux->framerate_denominator /
(dvdemux->frame_len * dvdemux->framerate_numerator);
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_numerator /
(dvdemux->framerate_denominator * GST_SECOND);
else if (pad == dvdemux->audiosrcpad)
*dest_value = 2 * src_value * dvdemux->frequency *
dvdemux->channels / GST_SECOND;
break;
case GST_FORMAT_DEFAULT:
if (pad == dvdemux->videosrcpad) {
if (src_value)
*dest_value = src_value * dvdemux->framerate_numerator /
(dvdemux->framerate_denominator * GST_SECOND);
else
*dest_value = 0;
} else if (pad == dvdemux->audiosrcpad) {
*dest_value = 2 * src_value * dvdemux->frequency *
dvdemux->channels / (GST_SECOND *
gst_audio_frame_byte_size (pad));
}
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_denominator / dvdemux->framerate_numerator;
} 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);
}
break;
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
done:
gst_object_unref (dvdemux);
GST_INFO ("Result : dest_format:%d, dest_value:%lld, res:%d",
*dest_format, *dest_value, res);
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);
GST_INFO ("pad:%s:%s, src_value:%lld, src_format:%d, dest_format:%d",
GST_DEBUG_PAD_NAME (pad), src_value, 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_denominator) /
dvdemux->framerate_numerator;
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_numerator /
(dvdemux->framerate_denominator * GST_SECOND);
/* calculate the offset */
*dest_value = frame * dvdemux->frame_len;
break;
}
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
GST_INFO ("Result : dest_format:%d, dest_value:%lld, res:%d",
*dest_format, *dest_value, res);
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_DURATION,
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;
/* get target format */
gst_query_parse_position (query, &format, NULL);
/* 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);
break;
}
case GST_QUERY_DURATION:
{
GstFormat format;
GstFormat format2;
gint64 end;
GstPad *peer;
/* get target format */
gst_query_parse_duration (query, &format, NULL);
/* change query to bytes to perform on peer */
gst_query_set_duration (query, GST_FORMAT_BYTES, -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_duration (query, NULL, &end);
gst_object_unref (peer);
/* convert end to requested format */
if (end != -1) {
format2 = format;
if (!(res = gst_pad_query_convert (dvdemux->sinkpad,
GST_FORMAT_BYTES, end, &format2, &end))) {
goto error;
}
}
} else {
end = -1;
}
gst_query_set_duration (query, format, 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);
break;
case GST_EVENT_FLUSH_STOP:
gst_adapter_clear (dvdemux->adapter);
GST_DEBUG ("cleared adapter");
res = gst_dvdemux_send_event (dvdemux, event);
break;
case GST_EVENT_NEWSEGMENT:
{
GstFormat format;
/* parse byte start and stop positions */
gst_event_parse_new_segment (event, NULL, 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);
break;
}
case GST_EVENT_EOS:
default:
/* 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);
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) {
GST_INFO ("starting conversion of cur");
/* 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;
}
GST_INFO ("Finished conversion of cur, BYTES cur : %lld",
start_position);
} else {
start_position = -1;
}
if ((offset = stop) != -1) {
GST_INFO ("starting conversion of stop");
/* 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;
}
GST_INFO ("Finished conversion of stop, BYTES cur : %lld",
start_position);
} 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", GST_TYPE_FRACTION, dvdemux->framerate_numerator,
dvdemux->framerate_denominator,
"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);
outbuf->malloc_data = GST_BUFFER_DATA (outbuf);
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;
/* calculate current frame number */
format = GST_FORMAT_DEFAULT;
if (!(res = gst_pad_query_convert (dvdemux->videosrcpad,
GST_FORMAT_TIME,
dvdemux->start_timestamp, &format, &dvdemux->total_frames))) {
goto discont_error;
}
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;
}
}
event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME,
dvdemux->start_timestamp, dvdemux->stop_timestamp,
dvdemux->start_timestamp);
gst_dvdemux_send_event (dvdemux, event);
dvdemux->need_discont = FALSE;
}
next_ts = gst_util_uint64_scale_int (
(dvdemux->total_frames + 1) * GST_SECOND,
dvdemux->framerate_denominator, dvdemux->framerate_numerator);
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;
dvdemux->total_frames++;
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);
if (dvdemux->PAL) {
dvdemux->framerate_numerator = PAL_FRAMERATE_NUMERATOR;
dvdemux->framerate_denominator = PAL_FRAMERATE_DENOMINATOR;
} else {
dvdemux->framerate_numerator = NTSC_FRAMERATE_NUMERATOR;
dvdemux->framerate_denominator = NTSC_FRAMERATE_DENOMINATOR;
}
/* 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_take (dvdemux->adapter, length);
/* 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));
/* temporary hack? Can't do this from the state change */
if (!dvdemux->videosrcpad)
gst_dvdemux_add_pads (dvdemux);
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 GstStateChangeReturn
gst_dvdemux_change_state (GstElement * element, GstStateChange transition)
{
GstDVDemux *dvdemux = GST_DVDEMUX (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_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_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = parent_class->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_adapter_clear (dvdemux->adapter);
dv_decoder_free (dvdemux->decoder);
dvdemux->decoder = NULL;
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
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