dummy_pcm.c

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/*
 * Copyright (c) 2013-2015 CESNET, z. s. p. o.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of CESNET nor the names of its contributors may be
 *    used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#include "config_unix.h"
#include "config_win32.h"
#endif /* HAVE_CONFIG_H */
 
#include "audio/audio.h"
#include "audio/codec.h"
 
#include "debug.h"
#include "lib_common.h"
 
#define MAGIC 0x552bca11
 
static void *dummy_pcm_init(audio_codec_t audio_codec, audio_codec_direction_t direction, bool try_init,
                int bitrate);
static audio_channel *dummy_pcm_compress(void *, audio_channel *);
static audio_channel *dummy_pcm_decompress(void *, audio_channel *);
static void dummy_pcm_done(void *);
 
struct dummy_pcm_codec_state {
        uint32_t magic;
};
 
static void *dummy_pcm_init(audio_codec_t audio_codec, audio_codec_direction_t direction, bool try_init,
                int bitrate)
{
        UNUSED(direction);
        UNUSED(try_init);
        UNUSED(bitrate);
        assert(audio_codec == AC_PCM);
        struct dummy_pcm_codec_state *s = malloc(sizeof(struct dummy_pcm_codec_state));
        s->magic = MAGIC;
        return s;
}
 
static audio_channel *dummy_pcm_compress(void *state, audio_channel * channel)
{
        struct dummy_pcm_codec_state *s = (struct dummy_pcm_codec_state *) state;
        assert(s->magic == MAGIC);
 
        return channel;
}
 
static audio_channel *dummy_pcm_decompress(void *state, audio_channel * channel)
{
        struct dummy_pcm_codec_state *s = (struct dummy_pcm_codec_state *) state;
        assert(s->magic == MAGIC);
 
        return channel;
}
 
static const int *dummy_pcm_get_sample_rates(void *state)
{
        UNUSED(state);
        return NULL;
}
 
static void dummy_pcm_done(void *state)
{
        struct dummy_pcm_codec_state *s = (struct dummy_pcm_codec_state *) state;
        assert(s->magic == MAGIC);
        free(s);
}
 
static const struct audio_compress_info dummy_pcm_audio_codec = {
        .supported_codecs = (audio_codec_t[]){ AC_PCM, AC_NONE },
        .init = dummy_pcm_init,
        .compress = dummy_pcm_compress,
        .decompress = dummy_pcm_decompress,
        .get_samplerates = dummy_pcm_get_sample_rates,
        .done = dummy_pcm_done
};
 
REGISTER_MODULE(dummy_pcm,  &dummy_pcm_audio_codec, LIBRARY_CLASS_AUDIO_COMPRESS, AUDIO_COMPRESS_ABI_VERSION);