diff options
Diffstat (limited to 'pjmedia/src/pjmedia/g711.c')
-rw-r--r-- | pjmedia/src/pjmedia/g711.c | 1234 |
1 files changed, 617 insertions, 617 deletions
diff --git a/pjmedia/src/pjmedia/g711.c b/pjmedia/src/pjmedia/g711.c index 708922ac..4275943f 100644 --- a/pjmedia/src/pjmedia/g711.c +++ b/pjmedia/src/pjmedia/g711.c @@ -1,617 +1,617 @@ -/* $Id$ */
-/*
- * Copyright (C) 2003-2006 Benny Prijono <benny@prijono.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-/* This file contains file from Sun Microsystems, Inc, with the complete
- * notice in the second half of this file.
- */
-#include <pjmedia/codec.h>
-#include <pj/pool.h>
-#include <pj/string.h>
-#include <string.h> /* memset */
-
-#define G711_BPS 64000
-#define G711_CODEC_CNT 0 /* number of codec to preallocate in memory */
-
-/* These are the only public functions exported to applications */
-PJ_DECL(pj_status_t) g711_init_factory (pj_codec_factory *factory, pj_pool_t *pool);
-PJ_DECL(pj_status_t) g711_deinit_factory (pj_codec_factory *factory);
-
-/* Algorithm prototypes. */
-static unsigned char linear2alaw(int pcm_val); /* 2's complement (16-bit range) */
-static int alaw2linear(unsigned char a_val);
-static unsigned char linear2ulaw(int pcm_val);
-static int ulaw2linear(unsigned char u_val);
-
-/* Prototypes for G711 factory */
-static pj_status_t g711_match_id( pj_codec_factory *factory, const pj_codec_id *id );
-static pj_status_t g711_default_attr( pj_codec_factory *factory, const pj_codec_id *id, pj_codec_attr *attr );
-static unsigned g711_enum_codecs (pj_codec_factory *factory, unsigned count, pj_codec_id codecs[]);
-static pj_codec* g711_alloc_codec( pj_codec_factory *factory, const pj_codec_id *id);
-static void g711_dealloc_codec( pj_codec_factory *factory, pj_codec *codec );
-
-/* Prototypes for G711 implementation. */
-static pj_status_t g711_codec_default_attr (pj_codec *codec, pj_codec_attr *attr);
-static pj_status_t g711_init( pj_codec *codec, pj_pool_t *pool );
-static pj_status_t g711_open( pj_codec *codec, pj_codec_attr *attr );
-static pj_status_t g711_close( pj_codec *codec );
-static pj_status_t g711_encode( pj_codec *codec, const struct pj_audio_frame *input,
- unsigned output_buf_len, struct pj_audio_frame *output);
-static pj_status_t g711_decode( pj_codec *codec, const struct pj_audio_frame *input,
- unsigned output_buf_len, struct pj_audio_frame *output);
-
-/* Definition for G711 codec operations. */
-static pj_codec_op g711_op =
-{
- &g711_codec_default_attr ,
- &g711_init,
- &g711_open,
- &g711_close,
- &g711_encode,
- &g711_decode
-};
-
-/* Definition for G711 codec factory operations. */
-static pj_codec_factory_op g711_factory_op =
-{
- &g711_match_id,
- &g711_default_attr,
- &g711_enum_codecs,
- &g711_alloc_codec,
- &g711_dealloc_codec
-};
-
-/* G711 factory private data */
-struct g711_factory_private
-{
- pj_pool_t *pool;
- pj_codec codec_list;
-};
-
-/* G711 codec private data. */
-struct g711_private
-{
- unsigned pt;
-};
-
-
-PJ_DEF(pj_status_t) g711_init_factory (pj_codec_factory *factory, pj_pool_t *pool)
-{
- struct g711_factory_private *priv;
- //enum { CODEC_MEM_SIZE = sizeof(pj_codec) + sizeof(struct g711_private) + 4 };
-
- /* Create pool. */
- /*
- pool = pj_pool_pool_create_pool(pp, "g711ftry",
- G711_CODEC_CNT*CODEC_MEM_SIZE +
- sizeof(struct g711_factory_private),
- CODEC_MEM_SIZE, NULL);
- if (!pool)
- return -1;
- */
-
- priv = pj_pool_alloc(pool, sizeof(struct g711_factory_private));
- if (!priv)
- return -1;
-
- factory->factory_data = priv;
- factory->op = &g711_factory_op;
-
- priv->pool = pool;
- pj_list_init(&priv->codec_list);
- return 0;
-}
-
-PJ_DEF(pj_status_t) g711_deinit_factory (pj_codec_factory *factory)
-{
- struct g711_factory_private *priv = factory->factory_data;
-
- /* Invalidate member to help detect errors */
- priv->pool = NULL;
- priv->codec_list.next = priv->codec_list.prev = NULL;
- return 0;
-}
-
-static pj_status_t g711_match_id( pj_codec_factory *factory, const pj_codec_id *id )
-{
- PJ_UNUSED_ARG(factory)
-
- /* It's sufficient to check payload type only. */
- return (id->pt==PJ_RTP_PT_PCMU || id->pt==PJ_RTP_PT_PCMA) ? 0 : -1;
-}
-
-static pj_status_t g711_default_attr (pj_codec_factory *factory,
- const pj_codec_id *id,
- pj_codec_attr *attr )
-{
- PJ_UNUSED_ARG(factory)
-
- memset(attr, 0, sizeof(pj_codec_attr));
- attr->sample_rate = 8000;
- attr->avg_bps = G711_BPS;
- attr->pcm_bits_per_sample = 16;
- attr->ptime = 20;
- attr->pt = id->pt;
-
- /* Default all flag bits disabled. */
-
- return PJ_SUCCESS;
-}
-
-static unsigned g711_enum_codecs (pj_codec_factory *factory,
- unsigned count, pj_codec_id codecs[])
-{
- PJ_UNUSED_ARG(factory)
-
- if (count > 0) {
- codecs[0].type = PJ_MEDIA_TYPE_AUDIO;
- codecs[0].pt = PJ_RTP_PT_PCMU;
- codecs[0].encoding_name = pj_str("PCMU");
- codecs[0].sample_rate = 8000;
- }
- if (count > 1) {
- codecs[1].type = PJ_MEDIA_TYPE_AUDIO;
- codecs[1].pt = PJ_RTP_PT_PCMA;
- codecs[1].encoding_name = pj_str("PCMA");
- codecs[1].sample_rate = 8000;
- }
-
- return 2;
-}
-
-static pj_codec *g711_alloc_codec( pj_codec_factory *factory, const pj_codec_id *id)
-{
- struct g711_factory_private *priv = factory->factory_data;
- pj_codec *codec = NULL;
-
- /* Allocate new codec if no more is available */
- if (pj_list_empty(&priv->codec_list)) {
- struct g711_private *codec_priv;
-
- codec = pj_pool_alloc(priv->pool, sizeof(pj_codec));
- codec_priv = pj_pool_alloc(priv->pool, sizeof(struct g711_private));
- if (!codec || !codec_priv)
- return NULL;
-
- codec_priv->pt = id->pt;
-
- codec->factory = factory;
- codec->op = &g711_op;
- codec->codec_data = codec_priv;
- } else {
- codec = priv->codec_list.next;
- pj_list_erase(codec);
- }
-
- /* Zero the list, for error detection in g711_dealloc_codec */
- codec->next = codec->prev = NULL;
-
- return codec;
-}
-
-static void g711_dealloc_codec( pj_codec_factory *factory, pj_codec *codec )
-{
- struct g711_factory_private *priv = factory->factory_data;
-
- /* Check that this node has not been deallocated before */
- pj_assert (codec->next==NULL && codec->prev==NULL);
- if (codec->next!=NULL || codec->prev!=NULL) {
- return;
- }
-
- /* Insert at the back of the list */
- pj_list_insert_before(&priv->codec_list, codec);
-}
-
-static pj_status_t g711_codec_default_attr (pj_codec *codec, pj_codec_attr *attr)
-{
- struct g711_private *priv = codec->codec_data;
- pj_codec_id id;
-
- id.pt = priv->pt;
- return g711_default_attr (NULL, &id, attr);
-}
-
-static pj_status_t g711_init( pj_codec *codec, pj_pool_t *pool )
-{
- /* There's nothing to do here really */
- PJ_UNUSED_ARG(codec)
- PJ_UNUSED_ARG(pool)
-
- return PJ_SUCCESS;
-}
-
-static pj_status_t g711_open( pj_codec *codec, pj_codec_attr *attr )
-{
- struct g711_private *priv = codec->codec_data;
- priv->pt = attr->pt;
- return PJ_SUCCESS;
-}
-
-static pj_status_t g711_close( pj_codec *codec )
-{
- PJ_UNUSED_ARG(codec);
- /* Nothing to do */
- return PJ_SUCCESS;
-}
-
-static pj_status_t g711_encode( pj_codec *codec, const struct pj_audio_frame *input,
- unsigned output_buf_len, struct pj_audio_frame *output)
-{
- pj_int16_t *samples = (pj_int16_t*) input->buf;
- struct g711_private *priv = codec->codec_data;
-
- /* Check output buffer length */
- if (output_buf_len < input->size / 2)
- return -1;
-
- /* Encode */
- if (priv->pt == PJ_RTP_PT_PCMA) {
- unsigned i;
- pj_uint8_t *dst = output->buf;
-
- for (i=0; i!=input->size/2; ++i, ++dst) {
- *dst = linear2alaw(samples[i]);
- }
- } else if (priv->pt == PJ_RTP_PT_PCMU) {
- unsigned i;
- pj_uint8_t *dst = output->buf;
-
- for (i=0; i!=input->size/2; ++i, ++dst) {
- *dst = linear2ulaw(samples[i]);
- }
-
- } else {
- return -1;
- }
-
- output->type = PJ_AUDIO_FRAME_AUDIO;
- output->size = input->size / 2;
-
- return 0;
-}
-
-static pj_status_t g711_decode( pj_codec *codec, const struct pj_audio_frame *input,
- unsigned output_buf_len, struct pj_audio_frame *output)
-{
- struct g711_private *priv = codec->codec_data;
-
- /* Check output buffer length */
- if (output_buf_len < input->size * 2)
- return -1;
-
- /* Decode */
- if (priv->pt == PJ_RTP_PT_PCMA) {
- unsigned i;
- pj_uint8_t *src = input->buf;
- pj_uint16_t *dst = output->buf;
-
- for (i=0; i!=input->size; ++i) {
- *dst++ = (pj_uint16_t) alaw2linear(*src++);
- }
- } else if (priv->pt == PJ_RTP_PT_PCMU) {
- unsigned i;
- pj_uint8_t *src = input->buf;
- pj_uint16_t *dst = output->buf;
-
- for (i=0; i!=input->size; ++i) {
- *dst++ = (pj_uint16_t) ulaw2linear(*src++);
- }
-
- } else {
- return -1;
- }
-
- output->type = PJ_AUDIO_FRAME_AUDIO;
- output->size = input->size * 2;
-
- return 0;
-}
-
-
-/*
- * This source code is a product of Sun Microsystems, Inc. and is provided
- * for unrestricted use. Users may copy or modify this source code without
- * charge.
- *
- * SUN SOURCE CODE IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING
- * THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
- *
- * Sun source code is provided with no support and without any obligation on
- * the part of Sun Microsystems, Inc. to assist in its use, correction,
- * modification or enhancement.
- *
- * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
- * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS SOFTWARE
- * OR ANY PART THEREOF.
- *
- * In no event will Sun Microsystems, Inc. be liable for any lost revenue
- * or profits or other special, indirect and consequential damages, even if
- * Sun has been advised of the possibility of such damages.
- *
- * Sun Microsystems, Inc.
- * 2550 Garcia Avenue
- * Mountain View, California 94043
- */
-
-
-
-#ifdef _MSC_VER
-# pragma warning ( disable: 4244 ) /* Conversion from int to char etc */
-#endif
-
-/*
- * g711.c
- *
- * u-law, A-law and linear PCM conversions.
- */
-#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
-#define QUANT_MASK (0xf) /* Quantization field mask. */
-#define NSEGS (8) /* Number of A-law segments. */
-#define SEG_SHIFT (4) /* Left shift for segment number. */
-#define SEG_MASK (0x70) /* Segment field mask. */
-
-static short seg_end[8] = {0xFF, 0x1FF, 0x3FF, 0x7FF,
- 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF};
-
-/* copy from CCITT G.711 specifications */
-static unsigned char _u2a[128] = { /* u- to A-law conversions */
- 1, 1, 2, 2, 3, 3, 4, 4,
- 5, 5, 6, 6, 7, 7, 8, 8,
- 9, 10, 11, 12, 13, 14, 15, 16,
- 17, 18, 19, 20, 21, 22, 23, 24,
- 25, 27, 29, 31, 33, 34, 35, 36,
- 37, 38, 39, 40, 41, 42, 43, 44,
- 46, 48, 49, 50, 51, 52, 53, 54,
- 55, 56, 57, 58, 59, 60, 61, 62,
- 64, 65, 66, 67, 68, 69, 70, 71,
- 72, 73, 74, 75, 76, 77, 78, 79,
- 81, 82, 83, 84, 85, 86, 87, 88,
- 89, 90, 91, 92, 93, 94, 95, 96,
- 97, 98, 99, 100, 101, 102, 103, 104,
- 105, 106, 107, 108, 109, 110, 111, 112,
- 113, 114, 115, 116, 117, 118, 119, 120,
- 121, 122, 123, 124, 125, 126, 127, 128};
-
-static unsigned char _a2u[128] = { /* A- to u-law conversions */
- 1, 3, 5, 7, 9, 11, 13, 15,
- 16, 17, 18, 19, 20, 21, 22, 23,
- 24, 25, 26, 27, 28, 29, 30, 31,
- 32, 32, 33, 33, 34, 34, 35, 35,
- 36, 37, 38, 39, 40, 41, 42, 43,
- 44, 45, 46, 47, 48, 48, 49, 49,
- 50, 51, 52, 53, 54, 55, 56, 57,
- 58, 59, 60, 61, 62, 63, 64, 64,
- 65, 66, 67, 68, 69, 70, 71, 72,
- 73, 74, 75, 76, 77, 78, 79, 79,
- 80, 81, 82, 83, 84, 85, 86, 87,
- 88, 89, 90, 91, 92, 93, 94, 95,
- 96, 97, 98, 99, 100, 101, 102, 103,
- 104, 105, 106, 107, 108, 109, 110, 111,
- 112, 113, 114, 115, 116, 117, 118, 119,
- 120, 121, 122, 123, 124, 125, 126, 127};
-
-static int
-search(
- int val,
- short *table,
- int size)
-{
- int i;
-
- for (i = 0; i < size; i++) {
- if (val <= *table++)
- return (i);
- }
- return (size);
-}
-
-/*
- * linear2alaw() - Convert a 16-bit linear PCM value to 8-bit A-law
- *
- * linear2alaw() accepts an 16-bit integer and encodes it as A-law data.
- *
- * Linear Input Code Compressed Code
- * ------------------------ ---------------
- * 0000000wxyza 000wxyz
- * 0000001wxyza 001wxyz
- * 000001wxyzab 010wxyz
- * 00001wxyzabc 011wxyz
- * 0001wxyzabcd 100wxyz
- * 001wxyzabcde 101wxyz
- * 01wxyzabcdef 110wxyz
- * 1wxyzabcdefg 111wxyz
- *
- * For further information see John C. Bellamy's Digital Telephony, 1982,
- * John Wiley & Sons, pps 98-111 and 472-476.
- */
-static unsigned char
-linear2alaw(
- int pcm_val) /* 2's complement (16-bit range) */
-{
- int mask;
- int seg;
- unsigned char aval;
-
- if (pcm_val >= 0) {
- mask = 0xD5; /* sign (7th) bit = 1 */
- } else {
- mask = 0x55; /* sign bit = 0 */
- pcm_val = -pcm_val - 8;
- }
-
- /* Convert the scaled magnitude to segment number. */
- seg = search(pcm_val, seg_end, 8);
-
- /* Combine the sign, segment, and quantization bits. */
-
- if (seg >= 8) /* out of range, return maximum value. */
- return (0x7F ^ mask);
- else {
- aval = seg << SEG_SHIFT;
- if (seg < 2)
- aval |= (pcm_val >> 4) & QUANT_MASK;
- else
- aval |= (pcm_val >> (seg + 3)) & QUANT_MASK;
- return (aval ^ mask);
- }
-}
-
-/*
- * alaw2linear() - Convert an A-law value to 16-bit linear PCM
- *
- */
-static int
-alaw2linear(
- unsigned char a_val)
-{
- int t;
- int seg;
-
- a_val ^= 0x55;
-
- t = (a_val & QUANT_MASK) << 4;
- seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
- switch (seg) {
- case 0:
- t += 8;
- break;
- case 1:
- t += 0x108;
- break;
- default:
- t += 0x108;
- t <<= seg - 1;
- }
- return ((a_val & SIGN_BIT) ? t : -t);
-}
-
-#define BIAS (0x84) /* Bias for linear code. */
-
-/*
- * linear2ulaw() - Convert a linear PCM value to u-law
- *
- * In order to simplify the encoding process, the original linear magnitude
- * is biased by adding 33 which shifts the encoding range from (0 - 8158) to
- * (33 - 8191). The result can be seen in the following encoding table:
- *
- * Biased Linear Input Code Compressed Code
- * ------------------------ ---------------
- * 00000001wxyza 000wxyz
- * 0000001wxyzab 001wxyz
- * 000001wxyzabc 010wxyz
- * 00001wxyzabcd 011wxyz
- * 0001wxyzabcde 100wxyz
- * 001wxyzabcdef 101wxyz
- * 01wxyzabcdefg 110wxyz
- * 1wxyzabcdefgh 111wxyz
- *
- * Each biased linear code has a leading 1 which identifies the segment
- * number. The value of the segment number is equal to 7 minus the number
- * of leading 0's. The quantization interval is directly available as the
- * four bits wxyz. * The trailing bits (a - h) are ignored.
- *
- * Ordinarily the complement of the resulting code word is used for
- * transmission, and so the code word is complemented before it is returned.
- *
- * For further information see John C. Bellamy's Digital Telephony, 1982,
- * John Wiley & Sons, pps 98-111 and 472-476.
- */
-static unsigned char
-linear2ulaw(
- int pcm_val) /* 2's complement (16-bit range) */
-{
- int mask;
- int seg;
- unsigned char uval;
-
- /* Get the sign and the magnitude of the value. */
- if (pcm_val < 0) {
- pcm_val = BIAS - pcm_val;
- mask = 0x7F;
- } else {
- pcm_val += BIAS;
- mask = 0xFF;
- }
-
- /* Convert the scaled magnitude to segment number. */
- seg = search(pcm_val, seg_end, 8);
-
- /*
- * Combine the sign, segment, quantization bits;
- * and complement the code word.
- */
- if (seg >= 8) /* out of range, return maximum value. */
- return (0x7F ^ mask);
- else {
- uval = (seg << 4) | ((pcm_val >> (seg + 3)) & 0xF);
- return (uval ^ mask);
- }
-
-}
-
-/*
- * ulaw2linear() - Convert a u-law value to 16-bit linear PCM
- *
- * First, a biased linear code is derived from the code word. An unbiased
- * output can then be obtained by subtracting 33 from the biased code.
- *
- * Note that this function expects to be passed the complement of the
- * original code word. This is in keeping with ISDN conventions.
- */
-static int
-ulaw2linear(
- unsigned char u_val)
-{
- int t;
-
- /* Complement to obtain normal u-law value. */
- u_val = ~u_val;
-
- /*
- * Extract and bias the quantization bits. Then
- * shift up by the segment number and subtract out the bias.
- */
- t = ((u_val & QUANT_MASK) << 3) + BIAS;
- t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;
-
- return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS));
-}
-
-/* A-law to u-law conversion */
-unsigned char
-alaw2ulaw(
- unsigned char aval)
-{
- aval &= 0xff;
- return ((aval & 0x80) ? (0xFF ^ _a2u[aval ^ 0xD5]) :
- (0x7F ^ _a2u[aval ^ 0x55]));
-}
-
-/* u-law to A-law conversion */
-unsigned char
-ulaw2alaw(
- unsigned char uval)
-{
- uval &= 0xff;
- return ((uval & 0x80) ? (0xD5 ^ (_u2a[0xFF ^ uval] - 1)) :
- (0x55 ^ (_u2a[0x7F ^ uval] - 1)));
-}
-
-
-
+/* $Id$ */ +/* + * Copyright (C) 2003-2006 Benny Prijono <benny@prijono.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +/* This file contains file from Sun Microsystems, Inc, with the complete + * notice in the second half of this file. + */ +#include <pjmedia/codec.h> +#include <pj/pool.h> +#include <pj/string.h> +#include <string.h> /* memset */ + +#define G711_BPS 64000 +#define G711_CODEC_CNT 0 /* number of codec to preallocate in memory */ + +/* These are the only public functions exported to applications */ +PJ_DECL(pj_status_t) g711_init_factory (pj_codec_factory *factory, pj_pool_t *pool); +PJ_DECL(pj_status_t) g711_deinit_factory (pj_codec_factory *factory); + +/* Algorithm prototypes. */ +static unsigned char linear2alaw(int pcm_val); /* 2's complement (16-bit range) */ +static int alaw2linear(unsigned char a_val); +static unsigned char linear2ulaw(int pcm_val); +static int ulaw2linear(unsigned char u_val); + +/* Prototypes for G711 factory */ +static pj_status_t g711_match_id( pj_codec_factory *factory, const pj_codec_id *id ); +static pj_status_t g711_default_attr( pj_codec_factory *factory, const pj_codec_id *id, pj_codec_attr *attr ); +static unsigned g711_enum_codecs (pj_codec_factory *factory, unsigned count, pj_codec_id codecs[]); +static pj_codec* g711_alloc_codec( pj_codec_factory *factory, const pj_codec_id *id); +static void g711_dealloc_codec( pj_codec_factory *factory, pj_codec *codec ); + +/* Prototypes for G711 implementation. */ +static pj_status_t g711_codec_default_attr (pj_codec *codec, pj_codec_attr *attr); +static pj_status_t g711_init( pj_codec *codec, pj_pool_t *pool ); +static pj_status_t g711_open( pj_codec *codec, pj_codec_attr *attr ); +static pj_status_t g711_close( pj_codec *codec ); +static pj_status_t g711_encode( pj_codec *codec, const struct pj_audio_frame *input, + unsigned output_buf_len, struct pj_audio_frame *output); +static pj_status_t g711_decode( pj_codec *codec, const struct pj_audio_frame *input, + unsigned output_buf_len, struct pj_audio_frame *output); + +/* Definition for G711 codec operations. */ +static pj_codec_op g711_op = +{ + &g711_codec_default_attr , + &g711_init, + &g711_open, + &g711_close, + &g711_encode, + &g711_decode +}; + +/* Definition for G711 codec factory operations. */ +static pj_codec_factory_op g711_factory_op = +{ + &g711_match_id, + &g711_default_attr, + &g711_enum_codecs, + &g711_alloc_codec, + &g711_dealloc_codec +}; + +/* G711 factory private data */ +struct g711_factory_private +{ + pj_pool_t *pool; + pj_codec codec_list; +}; + +/* G711 codec private data. */ +struct g711_private +{ + unsigned pt; +}; + + +PJ_DEF(pj_status_t) g711_init_factory (pj_codec_factory *factory, pj_pool_t *pool) +{ + struct g711_factory_private *priv; + //enum { CODEC_MEM_SIZE = sizeof(pj_codec) + sizeof(struct g711_private) + 4 }; + + /* Create pool. */ + /* + pool = pj_pool_pool_create_pool(pp, "g711ftry", + G711_CODEC_CNT*CODEC_MEM_SIZE + + sizeof(struct g711_factory_private), + CODEC_MEM_SIZE, NULL); + if (!pool) + return -1; + */ + + priv = pj_pool_alloc(pool, sizeof(struct g711_factory_private)); + if (!priv) + return -1; + + factory->factory_data = priv; + factory->op = &g711_factory_op; + + priv->pool = pool; + pj_list_init(&priv->codec_list); + return 0; +} + +PJ_DEF(pj_status_t) g711_deinit_factory (pj_codec_factory *factory) +{ + struct g711_factory_private *priv = factory->factory_data; + + /* Invalidate member to help detect errors */ + priv->pool = NULL; + priv->codec_list.next = priv->codec_list.prev = NULL; + return 0; +} + +static pj_status_t g711_match_id( pj_codec_factory *factory, const pj_codec_id *id ) +{ + PJ_UNUSED_ARG(factory) + + /* It's sufficient to check payload type only. */ + return (id->pt==PJ_RTP_PT_PCMU || id->pt==PJ_RTP_PT_PCMA) ? 0 : -1; +} + +static pj_status_t g711_default_attr (pj_codec_factory *factory, + const pj_codec_id *id, + pj_codec_attr *attr ) +{ + PJ_UNUSED_ARG(factory) + + memset(attr, 0, sizeof(pj_codec_attr)); + attr->sample_rate = 8000; + attr->avg_bps = G711_BPS; + attr->pcm_bits_per_sample = 16; + attr->ptime = 20; + attr->pt = id->pt; + + /* Default all flag bits disabled. */ + + return PJ_SUCCESS; +} + +static unsigned g711_enum_codecs (pj_codec_factory *factory, + unsigned count, pj_codec_id codecs[]) +{ + PJ_UNUSED_ARG(factory) + + if (count > 0) { + codecs[0].type = PJ_MEDIA_TYPE_AUDIO; + codecs[0].pt = PJ_RTP_PT_PCMU; + codecs[0].encoding_name = pj_str("PCMU"); + codecs[0].sample_rate = 8000; + } + if (count > 1) { + codecs[1].type = PJ_MEDIA_TYPE_AUDIO; + codecs[1].pt = PJ_RTP_PT_PCMA; + codecs[1].encoding_name = pj_str("PCMA"); + codecs[1].sample_rate = 8000; + } + + return 2; +} + +static pj_codec *g711_alloc_codec( pj_codec_factory *factory, const pj_codec_id *id) +{ + struct g711_factory_private *priv = factory->factory_data; + pj_codec *codec = NULL; + + /* Allocate new codec if no more is available */ + if (pj_list_empty(&priv->codec_list)) { + struct g711_private *codec_priv; + + codec = pj_pool_alloc(priv->pool, sizeof(pj_codec)); + codec_priv = pj_pool_alloc(priv->pool, sizeof(struct g711_private)); + if (!codec || !codec_priv) + return NULL; + + codec_priv->pt = id->pt; + + codec->factory = factory; + codec->op = &g711_op; + codec->codec_data = codec_priv; + } else { + codec = priv->codec_list.next; + pj_list_erase(codec); + } + + /* Zero the list, for error detection in g711_dealloc_codec */ + codec->next = codec->prev = NULL; + + return codec; +} + +static void g711_dealloc_codec( pj_codec_factory *factory, pj_codec *codec ) +{ + struct g711_factory_private *priv = factory->factory_data; + + /* Check that this node has not been deallocated before */ + pj_assert (codec->next==NULL && codec->prev==NULL); + if (codec->next!=NULL || codec->prev!=NULL) { + return; + } + + /* Insert at the back of the list */ + pj_list_insert_before(&priv->codec_list, codec); +} + +static pj_status_t g711_codec_default_attr (pj_codec *codec, pj_codec_attr *attr) +{ + struct g711_private *priv = codec->codec_data; + pj_codec_id id; + + id.pt = priv->pt; + return g711_default_attr (NULL, &id, attr); +} + +static pj_status_t g711_init( pj_codec *codec, pj_pool_t *pool ) +{ + /* There's nothing to do here really */ + PJ_UNUSED_ARG(codec) + PJ_UNUSED_ARG(pool) + + return PJ_SUCCESS; +} + +static pj_status_t g711_open( pj_codec *codec, pj_codec_attr *attr ) +{ + struct g711_private *priv = codec->codec_data; + priv->pt = attr->pt; + return PJ_SUCCESS; +} + +static pj_status_t g711_close( pj_codec *codec ) +{ + PJ_UNUSED_ARG(codec); + /* Nothing to do */ + return PJ_SUCCESS; +} + +static pj_status_t g711_encode( pj_codec *codec, const struct pj_audio_frame *input, + unsigned output_buf_len, struct pj_audio_frame *output) +{ + pj_int16_t *samples = (pj_int16_t*) input->buf; + struct g711_private *priv = codec->codec_data; + + /* Check output buffer length */ + if (output_buf_len < input->size / 2) + return -1; + + /* Encode */ + if (priv->pt == PJ_RTP_PT_PCMA) { + unsigned i; + pj_uint8_t *dst = output->buf; + + for (i=0; i!=input->size/2; ++i, ++dst) { + *dst = linear2alaw(samples[i]); + } + } else if (priv->pt == PJ_RTP_PT_PCMU) { + unsigned i; + pj_uint8_t *dst = output->buf; + + for (i=0; i!=input->size/2; ++i, ++dst) { + *dst = linear2ulaw(samples[i]); + } + + } else { + return -1; + } + + output->type = PJ_AUDIO_FRAME_AUDIO; + output->size = input->size / 2; + + return 0; +} + +static pj_status_t g711_decode( pj_codec *codec, const struct pj_audio_frame *input, + unsigned output_buf_len, struct pj_audio_frame *output) +{ + struct g711_private *priv = codec->codec_data; + + /* Check output buffer length */ + if (output_buf_len < input->size * 2) + return -1; + + /* Decode */ + if (priv->pt == PJ_RTP_PT_PCMA) { + unsigned i; + pj_uint8_t *src = input->buf; + pj_uint16_t *dst = output->buf; + + for (i=0; i!=input->size; ++i) { + *dst++ = (pj_uint16_t) alaw2linear(*src++); + } + } else if (priv->pt == PJ_RTP_PT_PCMU) { + unsigned i; + pj_uint8_t *src = input->buf; + pj_uint16_t *dst = output->buf; + + for (i=0; i!=input->size; ++i) { + *dst++ = (pj_uint16_t) ulaw2linear(*src++); + } + + } else { + return -1; + } + + output->type = PJ_AUDIO_FRAME_AUDIO; + output->size = input->size * 2; + + return 0; +} + + +/* + * This source code is a product of Sun Microsystems, Inc. and is provided + * for unrestricted use. Users may copy or modify this source code without + * charge. + * + * SUN SOURCE CODE IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING + * THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR + * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. + * + * Sun source code is provided with no support and without any obligation on + * the part of Sun Microsystems, Inc. to assist in its use, correction, + * modification or enhancement. + * + * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE + * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS SOFTWARE + * OR ANY PART THEREOF. + * + * In no event will Sun Microsystems, Inc. be liable for any lost revenue + * or profits or other special, indirect and consequential damages, even if + * Sun has been advised of the possibility of such damages. + * + * Sun Microsystems, Inc. + * 2550 Garcia Avenue + * Mountain View, California 94043 + */ + + + +#ifdef _MSC_VER +# pragma warning ( disable: 4244 ) /* Conversion from int to char etc */ +#endif + +/* + * g711.c + * + * u-law, A-law and linear PCM conversions. + */ +#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */ +#define QUANT_MASK (0xf) /* Quantization field mask. */ +#define NSEGS (8) /* Number of A-law segments. */ +#define SEG_SHIFT (4) /* Left shift for segment number. */ +#define SEG_MASK (0x70) /* Segment field mask. */ + +static short seg_end[8] = {0xFF, 0x1FF, 0x3FF, 0x7FF, + 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF}; + +/* copy from CCITT G.711 specifications */ +static unsigned char _u2a[128] = { /* u- to A-law conversions */ + 1, 1, 2, 2, 3, 3, 4, 4, + 5, 5, 6, 6, 7, 7, 8, 8, + 9, 10, 11, 12, 13, 14, 15, 16, + 17, 18, 19, 20, 21, 22, 23, 24, + 25, 27, 29, 31, 33, 34, 35, 36, + 37, 38, 39, 40, 41, 42, 43, 44, + 46, 48, 49, 50, 51, 52, 53, 54, + 55, 56, 57, 58, 59, 60, 61, 62, + 64, 65, 66, 67, 68, 69, 70, 71, + 72, 73, 74, 75, 76, 77, 78, 79, + 81, 82, 83, 84, 85, 86, 87, 88, + 89, 90, 91, 92, 93, 94, 95, 96, + 97, 98, 99, 100, 101, 102, 103, 104, + 105, 106, 107, 108, 109, 110, 111, 112, + 113, 114, 115, 116, 117, 118, 119, 120, + 121, 122, 123, 124, 125, 126, 127, 128}; + +static unsigned char _a2u[128] = { /* A- to u-law conversions */ + 1, 3, 5, 7, 9, 11, 13, 15, + 16, 17, 18, 19, 20, 21, 22, 23, + 24, 25, 26, 27, 28, 29, 30, 31, + 32, 32, 33, 33, 34, 34, 35, 35, + 36, 37, 38, 39, 40, 41, 42, 43, + 44, 45, 46, 47, 48, 48, 49, 49, + 50, 51, 52, 53, 54, 55, 56, 57, + 58, 59, 60, 61, 62, 63, 64, 64, + 65, 66, 67, 68, 69, 70, 71, 72, + 73, 74, 75, 76, 77, 78, 79, 79, + 80, 81, 82, 83, 84, 85, 86, 87, + 88, 89, 90, 91, 92, 93, 94, 95, + 96, 97, 98, 99, 100, 101, 102, 103, + 104, 105, 106, 107, 108, 109, 110, 111, + 112, 113, 114, 115, 116, 117, 118, 119, + 120, 121, 122, 123, 124, 125, 126, 127}; + +static int +search( + int val, + short *table, + int size) +{ + int i; + + for (i = 0; i < size; i++) { + if (val <= *table++) + return (i); + } + return (size); +} + +/* + * linear2alaw() - Convert a 16-bit linear PCM value to 8-bit A-law + * + * linear2alaw() accepts an 16-bit integer and encodes it as A-law data. + * + * Linear Input Code Compressed Code + * ------------------------ --------------- + * 0000000wxyza 000wxyz + * 0000001wxyza 001wxyz + * 000001wxyzab 010wxyz + * 00001wxyzabc 011wxyz + * 0001wxyzabcd 100wxyz + * 001wxyzabcde 101wxyz + * 01wxyzabcdef 110wxyz + * 1wxyzabcdefg 111wxyz + * + * For further information see John C. Bellamy's Digital Telephony, 1982, + * John Wiley & Sons, pps 98-111 and 472-476. + */ +static unsigned char +linear2alaw( + int pcm_val) /* 2's complement (16-bit range) */ +{ + int mask; + int seg; + unsigned char aval; + + if (pcm_val >= 0) { + mask = 0xD5; /* sign (7th) bit = 1 */ + } else { + mask = 0x55; /* sign bit = 0 */ + pcm_val = -pcm_val - 8; + } + + /* Convert the scaled magnitude to segment number. */ + seg = search(pcm_val, seg_end, 8); + + /* Combine the sign, segment, and quantization bits. */ + + if (seg >= 8) /* out of range, return maximum value. */ + return (0x7F ^ mask); + else { + aval = seg << SEG_SHIFT; + if (seg < 2) + aval |= (pcm_val >> 4) & QUANT_MASK; + else + aval |= (pcm_val >> (seg + 3)) & QUANT_MASK; + return (aval ^ mask); + } +} + +/* + * alaw2linear() - Convert an A-law value to 16-bit linear PCM + * + */ +static int +alaw2linear( + unsigned char a_val) +{ + int t; + int seg; + + a_val ^= 0x55; + + t = (a_val & QUANT_MASK) << 4; + seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT; + switch (seg) { + case 0: + t += 8; + break; + case 1: + t += 0x108; + break; + default: + t += 0x108; + t <<= seg - 1; + } + return ((a_val & SIGN_BIT) ? t : -t); +} + +#define BIAS (0x84) /* Bias for linear code. */ + +/* + * linear2ulaw() - Convert a linear PCM value to u-law + * + * In order to simplify the encoding process, the original linear magnitude + * is biased by adding 33 which shifts the encoding range from (0 - 8158) to + * (33 - 8191). The result can be seen in the following encoding table: + * + * Biased Linear Input Code Compressed Code + * ------------------------ --------------- + * 00000001wxyza 000wxyz + * 0000001wxyzab 001wxyz + * 000001wxyzabc 010wxyz + * 00001wxyzabcd 011wxyz + * 0001wxyzabcde 100wxyz + * 001wxyzabcdef 101wxyz + * 01wxyzabcdefg 110wxyz + * 1wxyzabcdefgh 111wxyz + * + * Each biased linear code has a leading 1 which identifies the segment + * number. The value of the segment number is equal to 7 minus the number + * of leading 0's. The quantization interval is directly available as the + * four bits wxyz. * The trailing bits (a - h) are ignored. + * + * Ordinarily the complement of the resulting code word is used for + * transmission, and so the code word is complemented before it is returned. + * + * For further information see John C. Bellamy's Digital Telephony, 1982, + * John Wiley & Sons, pps 98-111 and 472-476. + */ +static unsigned char +linear2ulaw( + int pcm_val) /* 2's complement (16-bit range) */ +{ + int mask; + int seg; + unsigned char uval; + + /* Get the sign and the magnitude of the value. */ + if (pcm_val < 0) { + pcm_val = BIAS - pcm_val; + mask = 0x7F; + } else { + pcm_val += BIAS; + mask = 0xFF; + } + + /* Convert the scaled magnitude to segment number. */ + seg = search(pcm_val, seg_end, 8); + + /* + * Combine the sign, segment, quantization bits; + * and complement the code word. + */ + if (seg >= 8) /* out of range, return maximum value. */ + return (0x7F ^ mask); + else { + uval = (seg << 4) | ((pcm_val >> (seg + 3)) & 0xF); + return (uval ^ mask); + } + +} + +/* + * ulaw2linear() - Convert a u-law value to 16-bit linear PCM + * + * First, a biased linear code is derived from the code word. An unbiased + * output can then be obtained by subtracting 33 from the biased code. + * + * Note that this function expects to be passed the complement of the + * original code word. This is in keeping with ISDN conventions. + */ +static int +ulaw2linear( + unsigned char u_val) +{ + int t; + + /* Complement to obtain normal u-law value. */ + u_val = ~u_val; + + /* + * Extract and bias the quantization bits. Then + * shift up by the segment number and subtract out the bias. + */ + t = ((u_val & QUANT_MASK) << 3) + BIAS; + t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT; + + return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS)); +} + +/* A-law to u-law conversion */ +unsigned char +alaw2ulaw( + unsigned char aval) +{ + aval &= 0xff; + return ((aval & 0x80) ? (0xFF ^ _a2u[aval ^ 0xD5]) : + (0x7F ^ _a2u[aval ^ 0x55])); +} + +/* u-law to A-law conversion */ +unsigned char +ulaw2alaw( + unsigned char uval) +{ + uval &= 0xff; + return ((uval & 0x80) ? (0xD5 ^ (_u2a[0xFF ^ uval] - 1)) : + (0x55 ^ (_u2a[0x7F ^ uval] - 1))); +} + + + |