125 lines
4.0 KiB
C
125 lines
4.0 KiB
C
/* Copyright (c) 2007 CSIRO
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Copyright (c) 2007-2009 Xiph.Org Foundation
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Written by Jean-Marc Valin */
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "celt_header.h"
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#include "os_support.h"
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#include "modes.h"
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static celt_uint32
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_le_32 (celt_uint32 i)
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{
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celt_uint32 ret=i;
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#if !defined(__LITTLE_ENDIAN__) && ( defined(WORDS_BIGENDIAN) || defined(__BIG_ENDIAN__) )
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ret = (i>>24);
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ret += (i>>8) & 0x0000ff00;
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ret += (i<<8) & 0x00ff0000;
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ret += (i<<24);
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#endif
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return ret;
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}
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int celt_header_init(CELTHeader *header, const CELTMode *m, int frame_size, int channels)
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{
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if (header==NULL)
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return CELT_BAD_ARG;
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CELT_COPY(header->codec_id, "CELT ", 8);
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CELT_COPY(header->codec_version, "experimental ", 20);
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/* FIXME: Set that to zero when we freeze */
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header->version_id = 0x80001000;
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header->header_size = 56;
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header->sample_rate = m->Fs;
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header->nb_channels = channels;
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/*FIXME: This won't work for variable frame size */
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header->frame_size = frame_size;
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header->overlap = m->overlap;
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header->bytes_per_packet = -1;
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header->extra_headers = 0;
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return CELT_OK;
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}
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int celt_header_to_packet(const CELTHeader *header, unsigned char *packet, celt_uint32 size)
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{
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celt_int32 * h;
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if ((size < 56) || (header==NULL) || (packet==NULL))
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return CELT_BAD_ARG; /* FAIL */
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CELT_MEMSET(packet, 0, sizeof(*header));
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/* FIXME: Do it in an alignment-safe manner */
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/* Copy ident and version */
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CELT_COPY(packet, (unsigned char*)header, 28);
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/* Copy the int32 fields */
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h = (celt_int32*)(packet+28);
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*h++ = _le_32 (header->version_id);
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*h++ = _le_32 (header->header_size);
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*h++ = _le_32 (header->sample_rate);
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*h++ = _le_32 (header->nb_channels);
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*h++ = _le_32 (header->frame_size);
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*h++ = _le_32 (header->overlap);
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*h++ = _le_32 (header->bytes_per_packet);
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*h = _le_32 (header->extra_headers);
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return sizeof(*header);
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}
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int celt_header_from_packet(const unsigned char *packet, celt_uint32 size, CELTHeader *header)
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{
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celt_int32 * h;
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if ((size < 56) || (header==NULL) || (packet==NULL))
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return CELT_BAD_ARG; /* FAIL */
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CELT_MEMSET((unsigned char*)header, 0, sizeof(*header));
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/* FIXME: Do it in an alignment-safe manner */
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/* Copy ident and version */
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CELT_COPY((unsigned char*)header, packet, 28);
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/* Copy the int32 fields */
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h = (celt_int32*)(packet+28);
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header->version_id = _le_32(*h++);
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header->header_size = _le_32(*h++);
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header->sample_rate = _le_32(*h++);
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header->nb_channels = _le_32(*h++);
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header->frame_size = _le_32(*h++);
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header->overlap = _le_32(*h++);
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header->bytes_per_packet = _le_32(*h++);
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header->extra_headers = _le_32(*h);
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return sizeof(*header);
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}
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