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gstreamer/ext/a52dec/gsta52dec.c
Thomas Vander Stichele cf0ea9d034 taaz's virtual patch 
Original commit message from CVS:
taaz's virtual patch
2001-12-26 21:51:41 +00:00

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/* GStreamer
* Copyright (C) <2001> David I. Lehn <dlehn@users.sourceforge.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <gst/gst.h>
#include <a52dec/a52.h>
#include <a52dec/mm_accel.h>
#include "gsta52dec.h"
/* elementfactory information */
static GstElementDetails gst_a52dec_details = {
"ATSC A/52 audio decoder",
"Filter/Decoder/Audio",
"Decodes ATSC A/52 encoded audio streams",
VERSION,
"David I. Lehn <dlehn@users.sourceforge.net>",
"(C) 2001",
};
/* A52Dec signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_DRC
};
/*
* "audio/a52" and "audio/ac3" are the same format. The name
* "ac3" is now deprecated and should not be used in new code.
*/
GST_PADTEMPLATE_FACTORY (sink_factory,
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"a52dec_sink",
"audio/a52",
NULL
),
GST_CAPS_NEW (
"ac3dec_sink",
"audio/ac3",
NULL
)
);
GST_PADTEMPLATE_FACTORY (src_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"a52dec_src",
"audio/raw",
"format", GST_PROPS_STRING ("int"),
"law", GST_PROPS_INT (0),
"endianness", GST_PROPS_INT (G_BYTE_ORDER),
"signed", GST_PROPS_BOOLEAN (TRUE),
"width", GST_PROPS_INT (16),
"depth", GST_PROPS_INT (16),
"rate", GST_PROPS_INT_RANGE (4000, 48000),
"channels", GST_PROPS_INT_RANGE (1, 6)
)
);
static void gst_a52dec_class_init (GstA52DecClass * klass);
static void gst_a52dec_init (GstA52Dec * a52dec);
static void gst_a52dec_loop (GstElement * element);
static GstElementStateReturn
gst_a52dec_change_state (GstElement * element);
static void gst_a52dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_a52dec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstElementClass *parent_class = NULL;
/* static guint gst_a52dec_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_a52dec_get_type (void)
{
static GType a52dec_type = 0;
if (!a52dec_type) {
static const GTypeInfo a52dec_info = {
sizeof (GstA52DecClass), NULL, NULL, (GClassInitFunc) gst_a52dec_class_init,
NULL,
NULL,
sizeof (GstA52Dec),
0,
(GInstanceInitFunc) gst_a52dec_init,
};
a52dec_type = g_type_register_static (GST_TYPE_ELEMENT, "GstA52Dec", &a52dec_info, 0);
}
return a52dec_type;
}
static void
gst_a52dec_class_init (GstA52DecClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_DRC,
g_param_spec_boolean ("drc", "Dynamic Range Compression",
"Use Dynamic Range Compression", FALSE,
G_PARAM_READWRITE));
gobject_class->set_property = gst_a52dec_set_property;
gobject_class->get_property = gst_a52dec_get_property;
gstelement_class->change_state = gst_a52dec_change_state;
}
static void
gst_a52dec_init (GstA52Dec * a52dec)
{
/* create the sink and src pads */
a52dec->sinkpad = gst_pad_new_from_template (GST_PADTEMPLATE_GET (sink_factory), "sink");
gst_element_add_pad (GST_ELEMENT (a52dec), a52dec->sinkpad);
gst_pad_set_caps (a52dec->sinkpad, gst_pad_get_padtemplate_caps (a52dec->sinkpad));
gst_element_set_loop_function ((GstElement *) a52dec, gst_a52dec_loop);
a52dec->srcpad = gst_pad_new_from_template (GST_PADTEMPLATE_GET (src_factory), "src");
gst_element_add_pad (GST_ELEMENT (a52dec), a52dec->srcpad);
a52dec->dynamic_range_compression = FALSE;
}
/* BEGIN modified a52dec conversion code */
static inline int16_t
convert (int32_t i)
{
if (i > 0x43c07fff)
return 32767;
else if (i < 0x43bf8000)
return -32768;
else
return i - 0x43c00000;
}
static inline void
float_to_int (float *_f, int16_t * s16, int flags)
{
int i;
int32_t *f = (int32_t *) _f;
switch (flags) {
case A52_MONO:
for (i = 0; i < 256; i++) {
s16[5 * i] = s16[5 * i + 1] = s16[5 * i + 2] = s16[5 * i + 3] = 0;
s16[5 * i + 4] = convert (f[i]);
}
break;
case A52_CHANNEL:
case A52_STEREO:
case A52_DOLBY:
for (i = 0; i < 256; i++) {
s16[2 * i] = convert (f[i]);
s16[2 * i + 1] = convert (f[i + 256]);
}
break;
case A52_3F:
for (i = 0; i < 256; i++) {
s16[5 * i] = convert (f[i]);
s16[5 * i + 1] = convert (f[i + 512]);
s16[5 * i + 2] = s16[5 * i + 3] = 0;
s16[5 * i + 4] = convert (f[i + 256]);
}
break;
case A52_2F2R:
for (i = 0; i < 256; i++) {
s16[4 * i] = convert (f[i]);
s16[4 * i + 1] = convert (f[i + 256]);
s16[4 * i + 2] = convert (f[i + 512]);
s16[4 * i + 3] = convert (f[i + 768]);
}
break;
case A52_3F2R:
for (i = 0; i < 256; i++) {
s16[5 * i] = convert (f[i]);
s16[5 * i + 1] = convert (f[i + 512]);
s16[5 * i + 2] = convert (f[i + 768]);
s16[5 * i + 3] = convert (f[i + 1024]);
s16[5 * i + 4] = convert (f[i + 256]);
}
break;
case A52_MONO | A52_LFE:
for (i = 0; i < 256; i++) {
s16[6 * i] = s16[6 * i + 1] = s16[6 * i + 2] = s16[6 * i + 3] = 0;
s16[6 * i + 4] = convert (f[i + 256]);
s16[6 * i + 5] = convert (f[i]);
}
break;
case A52_CHANNEL | A52_LFE:
case A52_STEREO | A52_LFE:
case A52_DOLBY | A52_LFE:
for (i = 0; i < 256; i++) {
s16[6 * i] = convert (f[i + 256]);
s16[6 * i + 1] = convert (f[i + 512]);
s16[6 * i + 2] = s16[6 * i + 3] = s16[6 * i + 4] = 0;
s16[6 * i + 5] = convert (f[i]);
}
break;
case A52_3F | A52_LFE:
for (i = 0; i < 256; i++) {
s16[6 * i] = convert (f[i + 256]);
s16[6 * i + 1] = convert (f[i + 768]);
s16[6 * i + 2] = s16[6 * i + 3] = 0;
s16[6 * i + 4] = convert (f[i + 512]);
s16[6 * i + 5] = convert (f[i]);
}
break;
case A52_2F2R | A52_LFE:
for (i = 0; i < 256; i++) {
s16[6 * i] = convert (f[i + 256]);
s16[6 * i + 1] = convert (f[i + 512]);
s16[6 * i + 2] = convert (f[i + 768]);
s16[6 * i + 3] = convert (f[i + 1024]);
s16[6 * i + 4] = 0;
s16[6 * i + 5] = convert (f[i]);
}
break;
case A52_3F2R | A52_LFE:
for (i = 0; i < 256; i++) {
s16[6 * i] = convert (f[i + 256]);
s16[6 * i + 1] = convert (f[i + 768]);
s16[6 * i + 2] = convert (f[i + 1024]);
s16[6 * i + 3] = convert (f[i + 1280]);
s16[6 * i + 4] = convert (f[i + 512]);
s16[6 * i + 5] = convert (f[i]);
}
break;
}
}
static int
gst_a52dec_channels (int flags)
{
int chans = 0;
if (flags & A52_LFE) {
chans += 1;
}
flags &= A52_CHANNEL_MASK;
switch (flags) {
case A52_3F2R:
chans += 5;
break;
case A52_2F2R:
case A52_3F1R:
chans += 4;
break;
case A52_2F1R:
case A52_3F:
chans += 3;
case A52_CHANNEL:
case A52_STEREO:
case A52_DOLBY:
chans += 2;
break;
default:
/* error */
fprintf (stderr, "a52dec invalid flags?");
return 0;
}
return chans;
}
static int
gst_a52dec_push (GstPad * srcpad, int flags, sample_t * _samples, gint64 timestamp)
{
GstBuffer *buf;
int chans;
#ifdef LIBA52_DOUBLE
float samples[256 * 6];
int i;
for (i = 0; i < 256 * 6; i++)
samples[i] = _samples[i];
#else
float *samples = _samples;
#endif
flags &= A52_CHANNEL_MASK | A52_LFE;
chans = gst_a52dec_channels (flags);
if (!chans) {
return 1;
}
buf = gst_buffer_new ();
GST_BUFFER_SIZE (buf) = sizeof (int16_t) * 256 * chans;
GST_BUFFER_DATA (buf) = g_malloc (GST_BUFFER_SIZE (buf));
GST_BUFFER_TIMESTAMP (buf) = timestamp;
float_to_int (samples, (int16_t *) GST_BUFFER_DATA (buf), flags);
gst_pad_push (srcpad, buf);
return 0;
}
/* END modified a52dec conversion code */
static void
gst_a52dec_reneg (GstPad * pad, int channels, int rate)
{
GST_INFO (GST_CAT_PLUGIN_INFO, "a52dec: reneg channels:%d rate:%d\n", channels, rate);
gst_pad_set_caps (pad, gst_caps_new ("a52dec_src_caps",
"audio/raw",
gst_props_new ("format", GST_PROPS_STRING ("int"),
"law", GST_PROPS_INT (0),
"endianness", GST_PROPS_INT (G_BYTE_ORDER),
"signed", GST_PROPS_BOOLEAN (TRUE),
"width", GST_PROPS_INT (16),
"depth", GST_PROPS_INT (16),
"channels", GST_PROPS_INT (channels),
"rate", GST_PROPS_INT (rate), NULL)
));
}
static void
gst_a52dec_handle_event (GstA52Dec *a52dec)
{
guint32 remaining;
GstEvent *event;
gst_bytestream_get_status (a52dec->bs, &remaining, &event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_DISCONTINUOUS:
gst_bytestream_flush_fast (a52dec->bs, remaining);
default:
gst_pad_event_default (a52dec->sinkpad, event);
break;
}
}
static void
gst_a52dec_loop (GstElement *element)
{
GstA52Dec *a52dec;
guint8 *data;
int i, length, flags, sample_rate, bit_rate;
int stream_channels;
GstBuffer *buf;
a52dec = GST_A52DEC (element);
/* find and read header */
while (1) {
data = gst_bytestream_peek_bytes (a52dec->bs, 7);
if (!data) {
gst_a52dec_handle_event (a52dec);
return;
}
length = a52_syncinfo (data, &flags, &sample_rate, &bit_rate);
if (length == 0) {
/* slide window to next 7 bytesa */
gst_bytestream_flush_fast (a52dec->bs, 1);
}
else
break;
/* FIXME this can potentially be an infinite loop, we have to
* insert a yield operations here */
}
/* check if params have changed since last call */
stream_channels = flags & A52_CHANNEL_MASK;
if ((sample_rate != a52dec->sample_rate) ||
(bit_rate != a52dec->bit_rate) ||
(stream_channels != a52dec->stream_channels))
{
a52dec->sample_rate = sample_rate;
a52dec->bit_rate = bit_rate;
a52dec->stream_channels = stream_channels;
/* FIXME force stereo for now */
a52dec->req_channels = A52_STEREO;
gst_a52dec_reneg (a52dec->srcpad,
gst_a52dec_channels (a52dec->req_channels), a52dec->sample_rate);
}
/* read the header + rest of frame */
buf = gst_bytestream_read (a52dec->bs, length);
if (!buf) {
gst_a52dec_handle_event (a52dec);
return;
}
data = GST_BUFFER_DATA (buf);
/* process */
flags = a52dec->req_channels | A52_ADJUST_LEVEL;
a52dec->level = 1;
memset (a52dec->state, 0, sizeof (a52_state_t));
if (a52_frame (a52dec->state, data, &flags, &a52dec->level, a52dec->bias)) {
fprintf (stderr, "a52dec a52_frame error\n");
goto end;
}
if ((flags & A52_CHANNEL_MASK) != a52dec->req_channels) {
gst_a52dec_reneg (a52dec->srcpad, gst_a52dec_channels (flags), a52dec->sample_rate);
}
if (a52dec->dynamic_range_compression == FALSE) {
a52_dynrng (a52dec->state, NULL, NULL);
}
for (i = 0; i < 6; i++) {
if (a52_block (a52dec->state, a52dec->samples)) {
gst_element_info (element, "a52dec a52_block error %d\n", i);
continue;
}
/* push on */
gst_a52dec_push (a52dec->srcpad, a52dec->req_channels, a52dec->samples, GST_BUFFER_TIMESTAMP (buf));
}
end:
/* FIXME, this is a possible leak */
gst_buffer_unref (buf);
}
static GstElementStateReturn
gst_a52dec_change_state (GstElement * element)
{
GstA52Dec *a52dec = GST_A52DEC (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
a52dec->bs = gst_bytestream_new (a52dec->sinkpad);
a52dec->samples = a52_init (0); /* mm_accel()); */
/* FIXME this is 0ed only untill a liba52 bug is fixed */
a52dec->state = g_new (a52_state_t, 1);
a52dec->bit_rate = -1;
a52dec->sample_rate = -1;
a52dec->stream_channels = -1;
a52dec->req_channels = -1;
a52dec->level = 1;
a52dec->bias = 384;
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
gst_bytestream_destroy (a52dec->bs);
a52dec->bs = NULL;
g_free (a52dec->state);
g_free (a52dec->samples);
break;
case GST_STATE_READY_TO_NULL:
break;
default:
break;
}
GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static void
gst_a52dec_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstA52Dec *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_A52DEC (object));
src = GST_A52DEC (object);
switch (prop_id) {
case ARG_DRC:
src->dynamic_range_compression = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_a52dec_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
{
GstA52Dec *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_A52DEC (object));
src = GST_A52DEC (object);
switch (prop_id) {
case ARG_DRC:
g_value_set_int (value, src->dynamic_range_compression);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
plugin_init (GModule * module, GstPlugin * plugin)
{
GstElementFactory *factory;
/* this filter needs the bytestream package */
if (!gst_library_load ("gstbytestream")) {
gst_info ("a52dec:: could not load support library: 'gstbytestream'\n");
return FALSE;
}
/* create an elementfactory for the a52dec element */
factory = gst_elementfactory_new ("a52dec", GST_TYPE_A52DEC, &gst_a52dec_details);
g_return_val_if_fail (factory != NULL, FALSE);
gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (src_factory));
gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (sink_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"a52dec",
plugin_init
};
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