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/* Swfdec
* Copyright (C) 2003-2006 David Schleef <ds@schleef.org>
* 2005-2006 Eric Anholt <eric@anholt.net>
* 2006 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 <string.h>
#include "swfdec_audio_stream.h"
#include "swfdec_debug.h"
#include "swfdec_sound.h"
#include "swfdec_sprite.h"
G_DEFINE_TYPE (SwfdecAudioStream, swfdec_audio_stream, SWFDEC_TYPE_AUDIO)
static void
swfdec_audio_stream_dispose (GObject *object)
{
SwfdecAudioStream *stream = SWFDEC_AUDIO_STREAM (object);
if (stream->decoder != NULL) {
g_object_unref (stream->decoder);
stream->decoder = NULL;
}
g_queue_foreach (stream->queue, (GFunc) swfdec_buffer_unref, NULL);
g_queue_free (stream->queue);
G_OBJECT_CLASS (swfdec_audio_stream_parent_class)->dispose (object);
}
/* returns: number of samples available */
static void
swfdec_audio_stream_require (SwfdecAudioStream *stream, guint n_samples)
{
SwfdecAudioStreamClass *klass = SWFDEC_AUDIO_STREAM_GET_CLASS (stream);
SwfdecBuffer *buffer;
/* subclasses are responsible for having set a proper decoder */
g_assert (SWFDEC_IS_AUDIO_DECODER (stream->decoder));
while (stream->queue_size < n_samples && !stream->done) {
/* if the decoder still has data */
buffer = swfdec_audio_decoder_pull (stream->decoder);
if (buffer) {
g_queue_push_tail (stream->queue, buffer);
stream->queue_size += buffer->length / 4;
continue;
}
/* otherwise get a new buffer from the decoder */
buffer = klass->pull (stream);
if (buffer == NULL) {
stream->buffering = TRUE;
break;
}
swfdec_audio_decoder_push (stream->decoder, buffer);
swfdec_buffer_unref (buffer);
}
}
static gsize
swfdec_audio_stream_render (SwfdecAudio *audio, gint16* dest,
gsize start, gsize n_samples)
{
SwfdecAudioStream *stream = SWFDEC_AUDIO_STREAM (audio);
GList *walk;
gsize samples, rendered, skip;
SwfdecBuffer *buffer;
g_assert (start < G_MAXINT);
SWFDEC_LOG ("stream %p rendering offset %"G_GSIZE_FORMAT", samples %"G_GSIZE_FORMAT,
stream, start, n_samples);
swfdec_audio_stream_require (stream, start + n_samples);
if (stream->queue_size <= start)
return 0;
n_samples = MIN (stream->queue_size, n_samples + start);
rendered = 0;
for (walk = g_queue_peek_head_link (stream->queue);
rendered < n_samples; walk = walk->next) {
/* must hold, we check above that enough data is available */
g_assert (walk);
buffer = walk->data;
samples = buffer->length / 4;
if (rendered < start) {
skip = MIN (samples, start - rendered);
samples -= skip;
samples = MIN (n_samples - start, samples);
} else {
skip = 0;
samples = MIN (n_samples - rendered, samples);
}
samples = MIN (n_samples - MAX (start, rendered), samples);
if (samples)
swfdec_sound_buffer_render (dest, buffer, skip, samples);
rendered += skip + samples;
dest += 2 * samples;
}
return rendered - start;
}
static gboolean
swfdec_audio_stream_check_buffering (SwfdecAudioStream *stream)
{
SwfdecAudioStreamClass *klass;
SwfdecBuffer *buffer;
if (!stream->buffering || stream->done)
return FALSE;
klass = SWFDEC_AUDIO_STREAM_GET_CLASS (stream);
buffer = klass->pull (stream);
if (buffer == NULL)
return FALSE;
swfdec_audio_decoder_push (stream->decoder, buffer);
swfdec_buffer_unref (buffer);
stream->buffering = FALSE;
g_signal_emit_by_name (stream, "new-data");
return stream->queue_size == 0;
}
static gsize
swfdec_audio_stream_iterate (SwfdecAudio *audio, gsize remove)
{
SwfdecAudioStream *stream = SWFDEC_AUDIO_STREAM (audio);
SwfdecBuffer *buffer;
gsize samples, cur_samples;
if (swfdec_audio_stream_check_buffering (stream))
return G_MAXUINT;
swfdec_audio_stream_require (stream, remove);
samples = MIN (remove, stream->queue_size);
while (samples > 0) {
buffer = g_queue_pop_head (stream->queue);
cur_samples = buffer->length / 4;
if (samples < cur_samples) {
SwfdecBuffer *sub = swfdec_buffer_new_subbuffer (buffer,
samples * 4, buffer->length - samples * 4);
g_queue_push_head (stream->queue, sub);
cur_samples = samples;
}
stream->queue_size -= cur_samples;
samples -= cur_samples;
}
if (!stream->done) {
return G_MAXUINT;
} else {
return stream->queue_size;
}
}
static void
swfdec_audio_stream_class_init (SwfdecAudioStreamClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
SwfdecAudioClass *audio_class = SWFDEC_AUDIO_CLASS (klass);
object_class->dispose = swfdec_audio_stream_dispose;
audio_class->iterate = swfdec_audio_stream_iterate;
audio_class->render = swfdec_audio_stream_render;
}
static void
swfdec_audio_stream_init (SwfdecAudioStream *stream)
{
stream->queue = g_queue_new ();
}
void
swfdec_audio_stream_use_decoder (SwfdecAudioStream *stream,
guint codec, SwfdecAudioFormat format)
{
g_return_if_fail (SWFDEC_IS_AUDIO_STREAM (stream));
g_return_if_fail (SWFDEC_IS_AUDIO_FORMAT (format));
if (stream->decoder) {
if (swfdec_audio_decoder_uses_format (stream->decoder, codec, format))
return;
/* FIXME: send NULL buffer */
g_object_unref (stream->decoder);
}
stream->decoder = swfdec_audio_decoder_new (codec, format);
}
void
swfdec_audio_stream_done (SwfdecAudioStream *stream)
{
g_return_if_fail (SWFDEC_IS_AUDIO_STREAM (stream));
g_return_if_fail (!stream->done);
stream->done = TRUE;
}
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