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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.h"
#include "swfdec_debug.h"
#include "swfdec_internal.h"
G_DEFINE_TYPE (SwfdecAudioDecoder, swfdec_audio_decoder, G_TYPE_OBJECT)
static void
swfdec_audio_decoder_class_init (SwfdecAudioDecoderClass *klass)
{
}
static void
swfdec_audio_decoder_init (SwfdecAudioDecoder *audio_decoder)
{
}
static GSList *audio_codecs = NULL;
void
swfdec_audio_decoder_register (GType type)
{
g_return_if_fail (g_type_is_a (type, SWFDEC_TYPE_AUDIO_DECODER));
audio_codecs = g_slist_append (audio_codecs, GSIZE_TO_POINTER ((gsize) type));
}
gboolean
swfdec_audio_decoder_prepare (guint codec, SwfdecAudioFormat format, char **missing)
{
char *detail = NULL, *s = NULL;
GSList *walk;
for (walk = audio_codecs; walk; walk = walk->next) {
SwfdecAudioDecoderClass *klass = g_type_class_ref (GPOINTER_TO_SIZE (walk->data));
if (klass->prepare (codec, format, &s)) {
g_free (detail);
g_free (s);
if (missing)
*missing = NULL;
g_type_class_unref (klass);
return TRUE;
}
if (s) {
if (detail == NULL)
detail = s;
else
g_free (s);
s = NULL;
}
g_type_class_unref (klass);
}
if (missing)
*missing = detail;
else
g_free (detail);
return FALSE;
}
/**
* swfdec_audio_decoder_new:
* @codec: codec id
* @format: #SwfdecAudioCodec to decode
*
* Creates a decoder suitable for decoding @format. If no decoder is available
* for the given for mat, %NULL is returned.
*
* Returns: a new decoder or %NULL
**/
SwfdecAudioDecoder *
swfdec_audio_decoder_new (guint codec, SwfdecAudioFormat format)
{
SwfdecAudioDecoder *ret = NULL;
GSList *walk;
g_return_val_if_fail (SWFDEC_IS_AUDIO_FORMAT (format), NULL);
for (walk = audio_codecs; walk; walk = walk->next) {
SwfdecAudioDecoderClass *klass = g_type_class_ref (GPOINTER_TO_SIZE (walk->data));
ret = klass->create (codec, format);
g_type_class_unref (klass);
if (ret)
break;
}
if (ret == NULL) {
ret = g_object_new (SWFDEC_TYPE_AUDIO_DECODER, NULL);
swfdec_audio_decoder_error (ret, "no suitable decoder for audio codec %u", codec);
}
ret->codec = codec;
ret->format = format;
return ret;
}
/**
* swfdec_audio_decoder_push:
* @decoder: a #SwfdecAudioDecoder
* @buffer: a #SwfdecBuffer to process or %NULL to flush
*
* Pushes a new buffer into the decoding pipeline. After this the results can
* be queried using swfdec_audio_decoder_pull(). Some decoders may not decode
* all available data immediately. So when you are done decoding, you may want
* to flush the decoder. Flushing can be achieved by passing %NULL as the
* @buffer argument. Do this when you are finished decoding.
**/
void
swfdec_audio_decoder_push (SwfdecAudioDecoder *decoder, SwfdecBuffer *buffer)
{
SwfdecAudioDecoderClass *klass;
g_return_if_fail (SWFDEC_IS_AUDIO_DECODER (decoder));
if (decoder->error)
return;
klass = SWFDEC_AUDIO_DECODER_GET_CLASS (decoder);
klass->push (decoder, buffer);
}
/**
* swfdec_audio_decoder_pull:
* @decoder: a #SwfdecAudioDecoder
*
* Gets the next buffer of decoded audio data. Since some decoders do not
* produce one output buffer per input buffer, any number of buffers may be
* available after calling swfdec_audio_decoder_push(), even none. When no more
* buffers are available, this function returns %NULL. You need to provide more
* input in then. A simple decoding pipeline would look like this:
* <informalexample><programlisting>do {
* input = next_input_buffer ();
* swfdec_audio_decoder_push (decoder, input);
* while ((output = swfdec_audio_decoder_pull (decoder))) {
* ... process output ...
* }
* } while (input != NULL); </programlisting></informalexample>
*
* Returns: the next buffer or %NULL if no more buffers are available.
**/
SwfdecBuffer *
swfdec_audio_decoder_pull (SwfdecAudioDecoder *decoder)
{
SwfdecAudioDecoderClass *klass;
SwfdecBuffer *result;
g_return_val_if_fail (SWFDEC_IS_AUDIO_DECODER (decoder), NULL);
if (decoder->error)
return NULL;
klass = SWFDEC_AUDIO_DECODER_GET_CLASS (decoder);
result = klass->pull (decoder);
/* result must be n samples of 44.1kHz stereo 16bit - and one sample is 4 bytes */
g_assert (result == NULL || result->length % 4 == 0);
return result;
}
void
swfdec_audio_decoder_error (SwfdecAudioDecoder *decoder, const char *error, ...)
{
va_list args;
g_return_if_fail (SWFDEC_IS_AUDIO_DECODER (decoder));
g_return_if_fail (error != NULL);
va_start (args, error);
swfdec_audio_decoder_errorv (decoder, error, args);
va_end (args);
}
void
swfdec_audio_decoder_errorv (SwfdecAudioDecoder *decoder, const char *error, va_list args)
{
char *real;
g_return_if_fail (SWFDEC_IS_AUDIO_DECODER (decoder));
g_return_if_fail (error != NULL);
real = g_strdup_vprintf (error, args);
SWFDEC_ERROR ("error decoding audio: %s", real);
g_free (real);
decoder->error = TRUE;
}
/**
* swfdec_audio_decoder_uses_format:
* @decoder: the decoder to check
* @codec: the codec the decoder should use
* @format: the format the decoder should use
*
* This is a little helper function that checks if the decoder uses the right
* format.
*
* Returns: %TRUE if the @decoder uses the given @codec and @format, %FALSE
* otherwise.
**/
gboolean
swfdec_audio_decoder_uses_format (SwfdecAudioDecoder *decoder, guint codec,
SwfdecAudioFormat format)
{
g_return_val_if_fail (SWFDEC_IS_AUDIO_DECODER (decoder), FALSE);
g_return_val_if_fail (SWFDEC_IS_AUDIO_FORMAT (format), FALSE);
return decoder->codec == codec && decoder->format == format;
}
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