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DependentExtensions/speex-1.1.12/libspeex/pcm_wrapper.c

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+/* Copyright (C) 2005 Jean-Marc Valin */
+/**
+  @file pcm_wrapper.c
+  @brief PCM encoding wrapped as a Speex mode
+ */
+/*
+   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 "speex/pcm_wrapper.h"
+#include "misc.h"
+
+
+typedef struct {
+   const SpeexMode *mode;
+   int frame_size;
+   int format;
+} PCMState;
+
+/** Initializes encoder state*/
+static void *pcm_encoder_init(const SpeexMode *m)
+{
+   PCMState *st = (PCMState*)speex_alloc(sizeof(PCMState));
+   st->mode = m;
+   st->frame_size = 64;
+   return st;
+}
+
+/** De-allocates encoder state resources*/
+static void pcm_encoder_destroy(void *state)
+{
+   speex_free(state);
+}
+
+/** Encodes one frame*/
+static int pcm_encode(void *state, void *vin, SpeexBits *bits)
+{
+   int i;
+   PCMState *st = (PCMState*)state;
+   spx_word16_t *in = vin;
+   for (i=0;i<st->frame_size;i++)
+   {
+      spx_int16_t x;
+      x = in[i];
+      speex_bits_pack(bits, x, 16);
+   }
+   return 0;
+}
+
+/** Initializes decoder state*/
+static void *pcm_decoder_init(const SpeexMode *m)
+{
+   PCMState *st = (PCMState*)speex_alloc(sizeof(PCMState));
+   st->mode = m;
+   st->frame_size = 64;
+   return st;
+}
+
+/** De-allocates decoder state resources*/
+static void pcm_decoder_destroy(void *state)
+{
+   speex_free(state);
+}
+
+/** Decodes one frame*/
+static int pcm_decode(void *state, SpeexBits *bits, void *vout)
+{
+   int i;
+   PCMState *st = (PCMState*)state;
+   spx_word16_t *out = vout;
+   for (i=0;i<st->frame_size;i++)
+   {
+      spx_int16_t x;
+      x = speex_bits_unpack_signed(bits, 16);
+      out[i] = x;
+   }
+   return 0;
+}
+
+/** ioctl-like function for controlling a narrowband encoder */
+static int pcm_encoder_ctl(void *state, int request, void *ptr)
+{
+   PCMState *st;
+   st=(PCMState*)state;
+   switch(request)
+   {
+      case PCM_SET_FRAME_SIZE:
+         st->frame_size = (*(int*)ptr);
+         break;
+      case PCM_GET_FRAME_SIZE:
+         (*(int*)ptr) = st->frame_size;
+         break;
+      default:
+         speex_warning_int("Unknown nb_ctl request: ", request);
+         return -1;
+   }
+   return 0;
+}
+
+/** ioctl-like function for controlling a narrowband decoder */
+static int pcm_decoder_ctl(void *state, int request, void *ptr)
+{
+   PCMState *st;
+   st=(PCMState*)state;
+   switch(request)
+   {
+      case PCM_SET_FRAME_SIZE:
+         st->frame_size = (*(int*)ptr);
+         break;
+      case PCM_GET_FRAME_SIZE:
+         (*(int*)ptr) = st->frame_size;
+         break;
+      default:
+         speex_warning_int("Unknown nb_ctl request: ", request);
+         return -1;
+   }
+   return 0;
+}
+
+typedef struct {
+} PCMMode;
+
+static PCMMode pcmmode;
+
+int pcm_mode_query(const void *mode, int request, void *ptr)
+{
+   /*const PCMMode *m = (const PCMMode*)mode;*/
+   
+   switch (request)
+   {
+      default:
+         speex_warning_int("Unknown nb_mode_query request: ", request);
+         return -1;
+   }
+   return 0;
+}
+/* Default mode for narrowband */
+const SpeexMode pcm_wrapper_mode = {
+   &pcmmode,
+   pcm_mode_query,
+   "PCM",
+   0,
+   4,
+   &pcm_encoder_init,
+   &pcm_encoder_destroy,
+   &pcm_encode,
+   &pcm_decoder_init,
+   &pcm_decoder_destroy,
+   &pcm_decode,
+   &pcm_encoder_ctl,
+   &pcm_decoder_ctl,
+};
+
+const SpeexMode *speex_pcm_wrapper = &pcm_wrapper_mode;