Add speex to trunk/deps/third_party/....

speex/libspeex/speex_header.c

+/* Copyright (C) 2002 Jean-Marc Valin 
+   File: speex_header.c
+   Describes the Speex header
+
+   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 "arch.h"
+#include <speex/speex_header.h>
+#include <speex/speex.h>
+#include "os_support.h"
+
+#ifndef NULL
+#define NULL 0
+#endif
+
+/** Convert little endian */
+static inline spx_int32_t le_int(spx_int32_t i)
+{
+#if !defined(__LITTLE_ENDIAN__) && ( defined(WORDS_BIGENDIAN) || defined(__BIG_ENDIAN__) )
+   spx_uint32_t ui, ret;
+   ui = i;
+   ret =  ui>>24;
+   ret |= (ui>>8)&0x0000ff00;
+   ret |= (ui<<8)&0x00ff0000;
+   ret |= (ui<<24);
+   return ret;
+#else
+   return i;
+#endif
+}
+
+#define ENDIAN_SWITCH(x) {x=le_int(x);}
+
+
+/*
+typedef struct SpeexHeader {
+   char speex_string[8];
+   char speex_version[SPEEX_HEADER_VERSION_LENGTH];
+   int speex_version_id;
+   int header_size;
+   int rate;
+   int mode;
+   int mode_bitstream_version;
+   int nb_channels;
+   int bitrate;
+   int frame_size;
+   int vbr;
+   int frames_per_packet;
+   int extra_headers;
+   int reserved1;
+   int reserved2;
+} SpeexHeader;
+*/
+
+EXPORT void speex_init_header(SpeexHeader *header, int rate, int nb_channels, const SpeexMode *m)
+{
+   int i;
+   const char *h="Speex   ";
+   /*
+   strncpy(header->speex_string, "Speex   ", 8);
+   strncpy(header->speex_version, SPEEX_VERSION, SPEEX_HEADER_VERSION_LENGTH-1);
+   header->speex_version[SPEEX_HEADER_VERSION_LENGTH-1]=0;
+   */
+   for (i=0;i<8;i++)
+      header->speex_string[i]=h[i];
+   for (i=0;i<SPEEX_HEADER_VERSION_LENGTH-1 && SPEEX_VERSION[i];i++)
+      header->speex_version[i]=SPEEX_VERSION[i];
+   for (;i<SPEEX_HEADER_VERSION_LENGTH;i++)
+      header->speex_version[i]=0;
+   
+   header->speex_version_id = 1;
+   header->header_size = sizeof(SpeexHeader);
+   
+   header->rate = rate;
+   header->mode = m->modeID;
+   header->mode_bitstream_version = m->bitstream_version;
+   if (m->modeID<0)
+      speex_warning("This mode is meant to be used alone");
+   header->nb_channels = nb_channels;
+   header->bitrate = -1;
+   speex_mode_query(m, SPEEX_MODE_FRAME_SIZE, &header->frame_size);
+   header->vbr = 0;
+   
+   header->frames_per_packet = 0;
+   header->extra_headers = 0;
+   header->reserved1 = 0;
+   header->reserved2 = 0;
+}
+
+EXPORT char *speex_header_to_packet(SpeexHeader *header, int *size)
+{
+   SpeexHeader *le_header;
+   le_header = (SpeexHeader*)speex_alloc(sizeof(SpeexHeader));
+   
+   SPEEX_COPY(le_header, header, 1);
+   
+   /*Make sure everything is now little-endian*/
+   ENDIAN_SWITCH(le_header->speex_version_id);
+   ENDIAN_SWITCH(le_header->header_size);
+   ENDIAN_SWITCH(le_header->rate);
+   ENDIAN_SWITCH(le_header->mode);
+   ENDIAN_SWITCH(le_header->mode_bitstream_version);
+   ENDIAN_SWITCH(le_header->nb_channels);
+   ENDIAN_SWITCH(le_header->bitrate);
+   ENDIAN_SWITCH(le_header->frame_size);
+   ENDIAN_SWITCH(le_header->vbr);
+   ENDIAN_SWITCH(le_header->frames_per_packet);
+   ENDIAN_SWITCH(le_header->extra_headers);
+
+   *size = sizeof(SpeexHeader);
+   return (char *)le_header;
+}
+
+EXPORT SpeexHeader *speex_packet_to_header(char *packet, int size)
+{
+   int i;
+   SpeexHeader *le_header;
+   const char *h = "Speex   ";
+   for (i=0;i<8;i++)
+      if (packet[i]!=h[i])
+      {
+         speex_notify("This doesn't look like a Speex file");
+         return NULL;
+      }
+   
+   /*FIXME: Do we allow larger headers?*/
+   if (size < (int)sizeof(SpeexHeader))
+   {
+      speex_notify("Speex header too small");
+      return NULL;
+   }
+   
+   le_header = (SpeexHeader*)speex_alloc(sizeof(SpeexHeader));
+   
+   SPEEX_COPY(le_header, (SpeexHeader*)packet, 1);
+   
+   /*Make sure everything is converted correctly from little-endian*/
+   ENDIAN_SWITCH(le_header->speex_version_id);
+   ENDIAN_SWITCH(le_header->header_size);
+   ENDIAN_SWITCH(le_header->rate);
+   ENDIAN_SWITCH(le_header->mode);
+   ENDIAN_SWITCH(le_header->mode_bitstream_version);
+   ENDIAN_SWITCH(le_header->nb_channels);
+   ENDIAN_SWITCH(le_header->bitrate);
+   ENDIAN_SWITCH(le_header->frame_size);
+   ENDIAN_SWITCH(le_header->vbr);
+   ENDIAN_SWITCH(le_header->frames_per_packet);
+   ENDIAN_SWITCH(le_header->extra_headers);
+
+   if (le_header->mode >= SPEEX_NB_MODES || le_header->mode < 0)
+   {
+      speex_notify("Invalid mode specified in Speex header");
+      speex_free (le_header);
+      return NULL;
+   }
+
+   if (le_header->nb_channels>2)
+      le_header->nb_channels = 2;
+   if (le_header->nb_channels<1)
+      le_header->nb_channels = 1;
+
+   return le_header;
+
+}
+
+EXPORT void speex_header_free(void *ptr)
+{
+   speex_free(ptr);
+}