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Diffstat (limited to 'src/libxineadec/logpcm.c')
| -rw-r--r-- | src/libxineadec/logpcm.c | 312 |
1 files changed, 0 insertions, 312 deletions
diff --git a/src/libxineadec/logpcm.c b/src/libxineadec/logpcm.c deleted file mode 100644 index 3e2ea1a25..000000000 --- a/src/libxineadec/logpcm.c +++ /dev/null @@ -1,312 +0,0 @@ -/* - * Copyright (C) 2000-2003 the xine project - * - * This file is part of xine, a free video player. - * - * xine 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. - * - * xine 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 - * - * Logarithmic PCM Decoder - * This audio decoder handles the mu-law and A-law logarithmic coding - * standards. - * - * mu-law -> PCM conversion routine found at this site: - * http://www.speech.cs.cmu.edu/comp.speech/Section2/Q2.7.html - * and credited to this person: - * Craig Reese: IDA/Supercomputing Research Center - * - * A-law -> PCM conversion routine lifted from SoX Sound eXchange: - * http://sox.sourceforge.net/ - * which listed the code as being lifted from Sun Microsystems. - * - * $Id: logpcm.c,v 1.19 2004/01/12 17:35:18 miguelfreitas Exp $ - * - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include <stdlib.h> -#include <string.h> - -#include "buffer.h" -#include "xine_internal.h" -#include "video_out.h" -#include "audio_out.h" -#include "xineutils.h" -#include "bswap.h" - -#define AUDIOBUFSIZE 128*1024 -#define LOGPCM_BITS_PER_SAMPLE 16 - -typedef struct { - audio_decoder_class_t decoder_class; -} logpcm_class_t; - -typedef struct logpcm_decoder_s { - audio_decoder_t audio_decoder; - - xine_stream_t *stream; - - int64_t pts; - - int output_open; - int output_channels; - int samplerate; - - unsigned char *buf; - int bufsize; - int size; - - short logtable[256]; -} logpcm_decoder_t; - -/* -** This routine converts from ulaw to 16 bit linear. -** -** Craig Reese: IDA/Supercomputing Research Center -** 29 September 1989 -** -** References: -** 1) CCITT Recommendation G.711 (very difficult to follow) -** 2) MIL-STD-188-113,"Interoperability and Performance Standards -** for Analog-to_Digital Conversion Techniques," -** 17 February 1987 -** -** Input: 8 bit ulaw sample -** Output: signed 16 bit linear sample -*/ - -static int mulaw2linear(unsigned char mulawbyte) { - - static int exp_lut[8] = {0,132,396,924,1980,4092,8316,16764}; - int sign, exponent, mantissa, sample; - - mulawbyte = ~mulawbyte; - sign = (mulawbyte & 0x80); - exponent = (mulawbyte >> 4) & 0x07; - mantissa = mulawbyte & 0x0F; - sample = exp_lut[exponent] + (mantissa << (exponent + 3)); - if (sign != 0) sample = -sample; - - return(sample); -} - -/* - * The following A-law -> PCM conversion function came from SoX which in - * turn came from Sun Microsystems. - */ -#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */ -#define QUANT_MASK (0xf) /* Quantization field mask. */ -#define SEG_SHIFT (4) /* Left shift for segment number. */ -#define SEG_MASK (0x70) /* Segment field mask. */ - -/* - * alaw2linear() - Convert an A-law value to 16-bit signed 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); -} - - -static void logpcm_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) { - - logpcm_decoder_t *this = (logpcm_decoder_t *) this_gen; - audio_buffer_t *audio_buffer; - int in; - int i; - int bytes_to_send; - - if (buf->decoder_flags & BUF_FLAG_STDHEADER) { - - this->samplerate = buf->decoder_info[1]; - this->output_channels = buf->decoder_info[3]; - this->buf = xine_xmalloc(AUDIOBUFSIZE); - this->bufsize = AUDIOBUFSIZE; - this->size = 0; - - /* stream/meta info */ - _x_meta_info_set(this->stream, XINE_META_INFO_AUDIOCODEC, - (buf->type == BUF_AUDIO_MULAW) ? "mu-law log PCM" : - "A-law log PCM" ); - - /* pre-calculate the possible log values */ - if (buf->type == BUF_AUDIO_MULAW) - for (i = 0; i < 256; i++) - this->logtable[i] = (short)mulaw2linear(i); - else if (buf->type == BUF_AUDIO_ALAW) - for (i = 0; i < 256; i++) - this->logtable[i] = (short)alaw2linear(i); - - return; - } - - if (!this->output_open) { - this->output_open = this->stream->audio_out->open(this->stream->audio_out, - this->stream, LOGPCM_BITS_PER_SAMPLE, this->samplerate, - (this->output_channels == 2) ? AO_CAP_MODE_STEREO : AO_CAP_MODE_MONO); - } - - /* if the audio still isn't open, bail */ - if (!this->output_open) - return; - - if( this->size + buf->size > this->bufsize ) { - this->bufsize = this->size + 2 * buf->size; - xprintf(this->stream->xine, XINE_VERBOSITY_DEBUG, - "logpcm: increasing source buffer to %d to avoid overflow.\n", this->bufsize); - this->buf = realloc( this->buf, this->bufsize ); - } - - xine_fast_memcpy (&this->buf[this->size], buf->content, buf->size); - this->size += buf->size; - - if (buf->decoder_flags & BUF_FLAG_FRAME_END) { /* time to decode a frame */ - - /* iterate through each 8-bit sample in the input buffer */ - in = 0; - while (in < this->size) { - - audio_buffer = this->stream->audio_out->get_buffer (this->stream->audio_out); - if (audio_buffer->mem_size == 0) { - xprintf (this->stream->xine, XINE_VERBOSITY_DEBUG, - "logpcm: Help! Allocated audio buffer with nothing in it!\n"); - return; - } - - /* this->size and in are sample counts, mem_size is a byte count */ - if ((this->size - in) > (audio_buffer->mem_size / 2)) - bytes_to_send = audio_buffer->mem_size / 2; - else - bytes_to_send = this->size - in; - - /* fill up this buffer */ - for (i = 0; i < bytes_to_send; i++) - audio_buffer->mem[i] = this->logtable[this->buf[in++]]; - - audio_buffer->num_frames = bytes_to_send / this->output_channels; - audio_buffer->vpts = buf->pts; - buf->pts = 0; /* only first buffer gets the real pts */ - this->stream->audio_out->put_buffer (this->stream->audio_out, audio_buffer, this->stream); - } - - /* reset internal accumulation buffer */ - this->size = 0; - } -} - -static void logpcm_reset (audio_decoder_t *this_gen) { -} - -static void logpcm_discontinuity (audio_decoder_t *this_gen) { - logpcm_decoder_t *this = (logpcm_decoder_t *) this_gen; - - this->pts = 0; -} - -static void logpcm_dispose (audio_decoder_t *this_gen) { - - logpcm_decoder_t *this = (logpcm_decoder_t *) this_gen; - - if (this->output_open) - this->stream->audio_out->close (this->stream->audio_out, this->stream); - this->output_open = 0; - - if (this->buf) - free(this->buf); - - free (this_gen); -} - -static audio_decoder_t *open_plugin (audio_decoder_class_t *class_gen, xine_stream_t *stream) { - - logpcm_decoder_t *this ; - - this = (logpcm_decoder_t *) xine_xmalloc (sizeof (logpcm_decoder_t)); - - this->audio_decoder.decode_data = logpcm_decode_data; - this->audio_decoder.reset = logpcm_reset; - this->audio_decoder.discontinuity = logpcm_discontinuity; - this->audio_decoder.dispose = logpcm_dispose; - - this->output_open = 0; - this->output_channels = 0; - this->stream = stream; - this->buf = NULL; - this->size = 0; - - return &this->audio_decoder; -} - -static char *get_identifier (audio_decoder_class_t *this) { - return "Log PCM"; -} - -static char *get_description (audio_decoder_class_t *this) { - return "Logarithmic PCM audio format decoder plugin"; -} - -static void dispose_class (audio_decoder_class_t *this) { - free (this); -} - -static void *init_plugin (xine_t *xine, void *data) { - - logpcm_class_t *this ; - - this = (logpcm_class_t *) xine_xmalloc (sizeof (logpcm_class_t)); - - this->decoder_class.open_plugin = open_plugin; - this->decoder_class.get_identifier = get_identifier; - this->decoder_class.get_description = get_description; - this->decoder_class.dispose = dispose_class; - - return this; -} - -static uint32_t audio_types[] = { BUF_AUDIO_MULAW, BUF_AUDIO_ALAW, 0 }; - -static decoder_info_t dec_info_audio = { - audio_types, /* supported types */ - 9 /* priority */ -}; - -plugin_info_t xine_plugin_info[] = { - /* type, API, "name", version, special_info, init_function */ - { PLUGIN_AUDIO_DECODER, 15, "logpcm", XINE_VERSION_CODE, &dec_info_audio, &init_plugin }, - { PLUGIN_NONE, 0, "", 0, NULL, NULL } -}; |