Initial import: xine-lib lpcm decoder

  rev. 9854:65cfe7575e18 (Mon Nov 30 21:24:21 2009 +0000)

1 files changed, 306 insertions, 0 deletions

diff --git a/xine/BluRay/xine_lpcm_decoder.c b/xine/BluRay/xine_lpcm_decoder.c
new file mode 100644
index 00000000..b7c0f8d1
--- /dev/null
+++ b/xine/BluRay/xine_lpcm_decoder.c
@@ -0,0 +1,306 @@
+/*
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
+ *
+ * 31-8-2001 Added LPCM rate sensing.
+ *   (c) 2001 James Courtier-Dutton James@superbug.demon.co.uk
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifndef __sun
+#define _XOPEN_SOURCE 500
+#endif
+/* avoid compiler warnings */
+#define _BSD_SOURCE 1
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <netinet/in.h> /* ntohs */
+
+#include "xine_internal.h"
+#include "audio_out.h"
+#include "buffer.h"
+
+#ifdef WIN32
+#include <winsock.h>
+/*#include <Winsock2.h>*/ /* htons */
+#endif
+
+typedef struct {
+  audio_decoder_class_t   decoder_class;
+} lpcm_class_t;
+
+typedef struct lpcm_decoder_s {
+  audio_decoder_t  audio_decoder;
+
+  xine_stream_t   *stream;
+
+  uint32_t         rate;
+  uint32_t         bits_per_sample;
+  uint32_t         number_of_channels;
+  uint32_t         ao_cap_mode;
+
+  int              output_open;
+  int		   cpu_be;	/* TRUE, if we're a Big endian CPU */
+} lpcm_decoder_t;
+
+static void lpcm_reset (audio_decoder_t *this_gen) {
+
+  /* lpcm_decoder_t *this = (lpcm_decoder_t *) this_gen; */
+
+}
+
+static void lpcm_discontinuity (audio_decoder_t *this_gen) {
+}
+
+static void lpcm_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
+
+  lpcm_decoder_t *this = (lpcm_decoder_t *) this_gen;
+  int16_t        *sample_buffer=(int16_t *)buf->content;
+  int             stream_be;
+  audio_buffer_t *audio_buffer;
+  int             format_changed = 0;
+
+  /* Drop preview data */
+  if (buf->decoder_flags & BUF_FLAG_PREVIEW)
+    return;
+
+  /* get config byte from mpeg2 stream */
+  if ( (buf->decoder_flags & BUF_FLAG_SPECIAL) &&
+        buf->decoder_info[1] == BUF_SPECIAL_LPCM_CONFIG ) {
+    unsigned int bits_per_sample = 16;
+    unsigned int sample_rate = 0;
+    unsigned int num_channels;
+
+    num_channels = (buf->decoder_info[2] & 0x7) + 1;
+    switch ((buf->decoder_info[2]>>4) & 3) {
+    case 0: sample_rate = 48000; break;
+    case 1: sample_rate = 96000; break;
+    case 2: sample_rate = 44100; break;
+    case 3: sample_rate = 32000; break;
+    }
+    switch ((buf->decoder_info[2]>>6) & 3) {
+      case 0: bits_per_sample = 16; break;
+      case 1: bits_per_sample = 20; break;
+      case 2: bits_per_sample = 24; break;
+    }
+
+    if( this->bits_per_sample != bits_per_sample ||
+        this->number_of_channels != num_channels ||
+        this->rate != sample_rate ||
+        !this->output_open ) {
+      this->bits_per_sample = bits_per_sample;
+      this->number_of_channels = num_channels;
+      this->rate = sample_rate;
+      format_changed++;
+    }
+  }
+
+  if( buf->decoder_flags & BUF_FLAG_STDHEADER ) {
+    this->rate=buf->decoder_info[1];
+    this->bits_per_sample=buf->decoder_info[2] ;
+    this->number_of_channels=buf->decoder_info[3] ;
+    format_changed++;
+  }
+
+  /*
+   * (re-)open output device
+   */
+  if ( format_changed ) {
+    if (this->output_open)
+        this->stream->audio_out->close (this->stream->audio_out, this->stream);
+
+    this->ao_cap_mode=_x_ao_channels2mode(this->number_of_channels);
+
+    /* force 24-bit samples into 16 bits for now */
+    if (this->bits_per_sample == 24)
+      this->output_open = (this->stream->audio_out->open) (this->stream->audio_out, this->stream,
+                                               16,
+                                               this->rate,
+                                               this->ao_cap_mode) ;
+    else
+      this->output_open = (this->stream->audio_out->open) (this->stream->audio_out, this->stream,
+                                               this->bits_per_sample,
+                                               this->rate,
+                                               this->ao_cap_mode) ;
+
+    /* stream/meta info */
+    _x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "Linear PCM");
+    _x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_BITRATE,
+        this->bits_per_sample * this->rate * this->number_of_channels);
+  }
+
+  if (!this->output_open || (buf->decoder_flags & BUF_FLAG_HEADER) )
+    return;
+
+  audio_buffer = this->stream->audio_out->get_buffer (this->stream->audio_out);
+
+  /* Swap LPCM samples into native byte order, if necessary */
+  buf->type &= 0xffff0000;
+  stream_be = ( buf->type == BUF_AUDIO_LPCM_BE );
+
+  if( this->bits_per_sample == 16 ){
+    if (stream_be != this->cpu_be)
+      swab (sample_buffer, audio_buffer->mem, buf->size);
+    else
+      memcpy (audio_buffer->mem, sample_buffer, buf->size);
+  }
+  else if( this->bits_per_sample == 20 ) {
+    uint8_t *s = (uint8_t *)sample_buffer;
+    uint8_t *d = (uint8_t *)audio_buffer->mem;
+    int n = buf->size;
+
+    if (stream_be != this->cpu_be) {
+      while( n >= 0 ) {
+        swab( s, d, 8 );
+        s += 10;
+        d += 8;
+        n -= 10;
+      }
+    } else {
+      while( n >= 0 ) {
+        memcpy( d, s, 8 );
+        s += 10;
+        d += 8;
+        n -= 10;
+      }
+    }
+  } else if( this->bits_per_sample == 24 ) {
+    uint8_t *s = (uint8_t *)sample_buffer;
+    uint8_t *d = (uint8_t *)audio_buffer->mem;
+    int n = buf->size;
+
+    while (n >= 3) {
+      if ( stream_be ) {
+	  if ( stream_be == this->cpu_be ) {
+	      *d++ = s[0];
+	      *d++ = s[1];
+	  } else {
+	      *d++ = s[1];
+	      *d++ = s[0];
+	  }
+      } else {
+	  if ( stream_be == this->cpu_be ) {
+	      *d++ = s[1];
+	      *d++ = s[2];
+	  }
+	  else
+	  {
+	      *d++ = s[2];
+	      *d++ = s[1];
+	  }
+      }
+
+      s += 3;
+      n -= 3;
+    }
+
+    if ( (d - (uint8_t*)audio_buffer->mem)/2*3 < buf->size )
+	xprintf(this->stream->xine, XINE_VERBOSITY_DEBUG, "lpcm_decoder: lost %i bytes\n", (int)(buf->size - (d - (uint8_t*)audio_buffer->mem))/2*3);
+
+  } else {
+    memcpy (audio_buffer->mem, sample_buffer, buf->size);
+  }
+
+  audio_buffer->vpts       = buf->pts;
+  audio_buffer->num_frames = (((buf->size*8)/this->number_of_channels)/this->bits_per_sample);
+
+  this->stream->audio_out->put_buffer (this->stream->audio_out, audio_buffer, this->stream);
+
+}
+
+static void lpcm_dispose (audio_decoder_t *this_gen) {
+  lpcm_decoder_t *this = (lpcm_decoder_t *) this_gen;
+
+  if (this->output_open)
+    this->stream->audio_out->close (this->stream->audio_out, this->stream);
+  this->output_open = 0;
+
+  free (this_gen);
+}
+
+static audio_decoder_t *open_plugin (audio_decoder_class_t *class_gen, xine_stream_t *stream) {
+
+  lpcm_decoder_t *this ;
+
+  this = (lpcm_decoder_t *) calloc(1, sizeof(lpcm_decoder_t));
+
+  this->audio_decoder.decode_data         = lpcm_decode_data;
+  this->audio_decoder.reset               = lpcm_reset;
+  this->audio_decoder.discontinuity       = lpcm_discontinuity;
+  this->audio_decoder.dispose             = lpcm_dispose;
+
+  this->output_open   = 0;
+  this->rate          = 0;
+  this->bits_per_sample=0;
+  this->number_of_channels=0;
+  this->ao_cap_mode=0;
+  this->stream = stream;
+
+  this->cpu_be        = ( htons(1) == 1 );
+
+  return &this->audio_decoder;
+}
+
+static char *get_identifier (audio_decoder_class_t *this) {
+  return "Linear PCM";
+}
+
+static char *get_description (audio_decoder_class_t *this) {
+  return "Linear PCM audio decoder plugin";
+}
+
+static void dispose_class (audio_decoder_class_t *this) {
+  free (this);
+}
+
+static void *init_plugin (xine_t *xine, void *data) {
+
+  lpcm_class_t *this ;
+
+  this = (lpcm_class_t *) calloc(1, sizeof(lpcm_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_LPCM_BE, BUF_AUDIO_LPCM_LE, 0
+};
+
+static const decoder_info_t dec_info_audio = {
+  audio_types,         /* supported types */
+  1                    /* priority        */
+};
+
+const plugin_info_t xine_plugin_info[] EXPORTED = {
+  /* type, API, "name", version, special_info, init_function */
+  { PLUGIN_AUDIO_DECODER, 15, "pcm", XINE_VERSION_CODE, &dec_info_audio, init_plugin },
+  { PLUGIN_NONE, 0, "", 0, NULL, NULL }
+};