diff options
Diffstat (limited to 'pjmedia/src/pjmedia-codec/speex/z-pcm_wrapper.c')
| -rw-r--r-- | pjmedia/src/pjmedia-codec/speex/z-pcm_wrapper.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/pjmedia/src/pjmedia-codec/speex/z-pcm_wrapper.c b/pjmedia/src/pjmedia-codec/speex/z-pcm_wrapper.c new file mode 100644 index 00000000..71f41812 --- /dev/null +++ b/pjmedia/src/pjmedia-codec/speex/z-pcm_wrapper.c @@ -0,0 +1,184 @@ +/* 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; |