/* (C) 2008 Jean-Marc Valin, CSIRO

*/

/*

   Redistribution and use in source and binary forms, with or without

   modification, are permitted provided that the following conditions

   are met:

   - Redistributions of source code must retain the above copyright

   notice, this list of conditions and the following disclaimer.

   - 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.

   - Neither the name of the Xiph.org Foundation 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 COPYRIGHT HOLDERS AND CONTRIBUTORS

   ``AS IS'' AND ANY EXPRESS 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 FOUNDATION 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"

#endif

#include "celt_header.h"

#include "os_support.h"

#include "modes.h"

/*typedef struct {

   char         codec_id[8];

   char         codec_version[20];

   celt_int32_t version_id;

   celt_int32_t header_size;

   celt_int32_t mode;

   celt_int32_t sample_rate;

   celt_int32_t nb_channels;

   celt_int32_t bytes_per_packet;

   celt_int32_t extra_headers;

} CELT051Header;*/

static  celt_uint32_t

_le_32 (celt_uint32_t i)

{

   celt_uint32_t ret=i;

#ifdef WORDS_BIGENDIAN

   ret =  (i>>24);

   ret += (i>>8) & 0x0000ff00;

   ret += (i<<8) & 0x00ff0000;

   ret += (i<<24);

#endif

   return ret;

}

void celt051_header_init(CELT051Header *header, const CELTMode *m)

{

   CELT_COPY(header->codec_id, "CELT    ", 8);

   CELT_COPY(header->codec_version, "experimental        ", 20);

   celt051_mode_info(m, CELT_GET_BITSTREAM_VERSION, &header->version_id);

   header->header_size = 56;

   header->sample_rate = m->Fs;

   header->nb_channels = m->nbChannels;

   header->frame_size = m->mdctSize;

   header->overlap = m->overlap;

   header->bytes_per_packet = -1;

   header->extra_headers = 0;

}

int celt051_header_to_packet(const CELT051Header *header, unsigned char *packet, celt_uint32_t size)

{

   celt_int32_t * h;

   if (size < 56) return CELT_BAD_ARG; /* FAIL */

   CELT_MEMSET(packet, 0, sizeof(*header));

   /* FIXME: Do it in an alignment-safe manner */

   /* Copy ident and version */

   CELT_COPY(packet, (unsigned char*)header, 28);

   /* Copy the int32 fields */

   h = (celt_int32_t*)(packet+28);

   *h++ = _le_32 (header->version_id);

   *h++ = _le_32 (header->header_size);

   *h++ = _le_32 (header->sample_rate);

   *h++ = _le_32 (header->nb_channels);

   *h++ = _le_32 (header->frame_size);

   *h++ = _le_32 (header->overlap);

   *h++ = _le_32 (header->bytes_per_packet);

   *h++ = _le_32 (header->extra_headers);

   return sizeof(*header);

}

int celt051_header_from_packet(const unsigned char *packet, celt_uint32_t size, CELT051Header *header)

{

   CELT_COPY((unsigned char*)header, packet, sizeof(*header));

   return sizeof(*header);

}