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/* Swfdec
* Copyright (C) 2006-2008 Benjamin Otte <otte@gnome.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "swfdec_audio_decoder_uncompressed.h"
#include "swfdec_debug.h"
#include "swfdec_internal.h"
G_DEFINE_TYPE (SwfdecAudioDecoderUncompressed, swfdec_audio_decoder_uncompressed, SWFDEC_TYPE_AUDIO_DECODER)
static gboolean
swfdec_audio_decoder_uncompressed_prepare (guint codec, SwfdecAudioFormat format, char **missing)
{
return codec == SWFDEC_AUDIO_CODEC_UNDEFINED ||
codec == SWFDEC_AUDIO_CODEC_UNCOMPRESSED;
}
static SwfdecAudioDecoder *
swfdec_audio_decoder_uncompressed_create (guint codec, SwfdecAudioFormat format, SwfdecBuffer *data)
{
if (codec != SWFDEC_AUDIO_CODEC_UNDEFINED &&
codec != SWFDEC_AUDIO_CODEC_UNCOMPRESSED)
return NULL;
return g_object_new (SWFDEC_TYPE_AUDIO_DECODER_UNCOMPRESSED, NULL);
}
static SwfdecBuffer *
swfdec_audio_decoder_uncompressed_upscale (SwfdecBuffer *buffer, SwfdecAudioFormat format)
{
guint channels = swfdec_audio_format_get_channels (format);
guint granularity = swfdec_audio_format_get_granularity (format);
SwfdecBuffer *ret;
guint i, j, n_samples;
gint16 *src, *dest;
n_samples = buffer->length / 2 / channels;
if (n_samples * 2 * channels != buffer->length) {
SWFDEC_ERROR ("incorrect buffer size, %"G_GSIZE_FORMAT" bytes overhead",
buffer->length - n_samples * 2 * channels);
}
ret = swfdec_buffer_new (n_samples * 4 * granularity);
/* can be upscaled, because the input buffer and the newly allocated buffer
* are aligned properly */
src = (gint16 *) (gpointer) buffer->data;
dest = (gint16 *) (gpointer) ret->data;
for (i = 0; i < n_samples; i++) {
for (j = 0; j < granularity; j++) {
*dest++ = src[0];
*dest++ = src[channels - 1];
}
src += channels;
}
swfdec_buffer_unref (buffer);
return ret;
}
static SwfdecBuffer *
swfdec_audio_decoder_uncompressed_decode_8bit (SwfdecBuffer *buffer)
{
SwfdecBuffer *ret;
gint16 *out;
guint8 *in;
guint i;
ret = swfdec_buffer_new (buffer->length * 2);
out = (gint16 *) (void *) ret->data;
in = buffer->data;
for (i = 0; i < buffer->length; i++) {
*out = ((gint16) *in << 8) ^ (-1);
out++;
in++;
}
return ret;
}
static SwfdecBuffer *
swfdec_audio_decoder_uncompressed_decode_16bit (SwfdecBuffer *buffer)
{
SwfdecBuffer *ret;
SwfdecBits bits;
gint16 *dest;
guint i;
if (buffer->length & 2) {
SWFDEC_ERROR ("buffer length not a multiple of 16bit");
}
ret = swfdec_buffer_new (buffer->length & ~1);
swfdec_bits_init (&bits, buffer);
dest = (gint16 *) (gpointer) ret->data;
for (i = 0; i < ret->length; i += 2) {
*dest = swfdec_bits_get_u16 (&bits);
dest++;
}
return ret;
}
static void
swfdec_audio_decoder_uncompressed_push (SwfdecAudioDecoder *decoder,
SwfdecBuffer *buffer)
{
SwfdecBuffer *tmp;
if (buffer == NULL)
return;
if (swfdec_audio_format_is_16bit (decoder->format))
tmp = swfdec_audio_decoder_uncompressed_decode_16bit (buffer);
else
tmp = swfdec_audio_decoder_uncompressed_decode_8bit (buffer);
tmp = swfdec_audio_decoder_uncompressed_upscale (tmp, decoder->format);
swfdec_buffer_queue_push (SWFDEC_AUDIO_DECODER_UNCOMPRESSED (decoder)->queue,
tmp);
}
static SwfdecBuffer *
swfdec_audio_decoder_uncompressed_pull (SwfdecAudioDecoder *decoder)
{
SwfdecAudioDecoderUncompressed *dec = (SwfdecAudioDecoderUncompressed *) decoder;
return swfdec_buffer_queue_pull_buffer (dec->queue);
}
static void
swfdec_audio_decoder_uncompressed_dispose (GObject *object)
{
SwfdecAudioDecoderUncompressed *dec = (SwfdecAudioDecoderUncompressed *) object;
swfdec_buffer_queue_unref (dec->queue);
G_OBJECT_CLASS (swfdec_audio_decoder_uncompressed_parent_class)->dispose (object);
}
static void
swfdec_audio_decoder_uncompressed_class_init (SwfdecAudioDecoderUncompressedClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
SwfdecAudioDecoderClass *decoder_class = SWFDEC_AUDIO_DECODER_CLASS (klass);
object_class->dispose = swfdec_audio_decoder_uncompressed_dispose;
decoder_class->prepare = swfdec_audio_decoder_uncompressed_prepare;
decoder_class->create = swfdec_audio_decoder_uncompressed_create;
decoder_class->pull = swfdec_audio_decoder_uncompressed_pull;
decoder_class->push = swfdec_audio_decoder_uncompressed_push;
}
static void
swfdec_audio_decoder_uncompressed_init (SwfdecAudioDecoderUncompressed *dec)
{
dec->queue = swfdec_buffer_queue_new ();
}
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