X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/71b70599a2cd81c13cc4326499a5d0c45358cd7d..e2daf70b506edb51fa81a003c9794120f2769672:/server/decode.c

diff --git a/server/decode.c b/server/decode.c
index 639ad15..ef999b3 100644
--- a/server/decode.c
+++ b/server/decode.c
@@ -1,37 +1,26 @@
 /*
  * This file is part of DisOrder
- * Copyright (C) 2007 Richard Kettlewell
+ * Copyright (C) 2007, 2008 Richard Kettlewell
  *
- * This program is free software; you can redistribute it and/or modify
+ * 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
+ * the Free Software Foundation, either version 3 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.
- *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 /** @file server/decode.c
  * @brief General-purpose decoder for use by speaker process
  */
 
-#include <config.h>
-#include "types.h"
-
-#include <getopt.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <locale.h>
-#include <assert.h>
-#include <fnmatch.h>
+#include "disorder-server.h"
+
 #include <mad.h>
 #include <vorbis/vorbisfile.h>
 
@@ -44,12 +33,10 @@
 #define FLAC__FileDecoderState FLAC__StreamDecoderState
 #endif
 
-#include "log.h"
-#include "syscalls.h"
-#include "defs.h"
 #include "wav.h"
 #include "speaker-protocol.h"
 
+
 /** @brief Encoding lookup table type */
 struct decoder {
   /** @brief Glob pattern matching file */
@@ -70,22 +57,8 @@ static const char *path;
 /** @brief Input buffer */
 static char input_buffer[1048576];
 
-/** @brief Open the input file */
-static void open_input(void) {
-  if((inputfd = open(path, O_RDONLY)) < 0)
-    fatal(errno, "opening %s", path);
-}
-
-/** @brief Fill the buffer
- * @return Number of bytes read
- */
-static size_t fill(void) {
-  int n = read(inputfd, input_buffer, sizeof input_buffer);
-
-  if(n < 0)
-    fatal(errno, "reading from %s", path);
-  return n;
-}
+/** @brief Number of bytes read into buffer */
+static int input_count;
 
 /** @brief Write an 8-bit word */
 static inline void output_8(int n) {
@@ -165,11 +138,11 @@ static inline unsigned long prng(unsigned long state)
 
 /** @brief Generic linear sample quantize and dither routine
  * Filched from mpg321, which credits it to Robert Leslie */
-#define bits 16
 static long audio_linear_dither(mad_fixed_t sample,
 				struct audio_dither *dither) {
   unsigned int scalebits;
   mad_fixed_t output, mask, rnd;
+  const int bits = 16;
 
   enum {
     MIN = -MAD_F_ONE,
@@ -217,7 +190,6 @@ static long audio_linear_dither(mad_fixed_t sample,
   /* scale */
   return output >> scalebits;
 }
-#undef bits
 
 /** @brief MP3 output callback */
 static enum mad_flow mp3_output(void attribute((unused)) *data,
@@ -250,15 +222,34 @@ static enum mad_flow mp3_output(void attribute((unused)) *data,
 /** @brief MP3 input callback */
 static enum mad_flow mp3_input(void attribute((unused)) *data,
 			       struct mad_stream *stream) {
-  const size_t n = fill();
-
-  if(!n)
+  int used, remain, n;
+
+  /* libmad requires its caller to do ALL the buffering work, including coping
+   * with partial frames.  Given that it appears to be completely undocumented
+   * you could perhaps be forgiven for not discovering this...  */
+  if(input_count) {
+    /* Compute total number of bytes consumed */
+    used = (char *)stream->next_frame - input_buffer;
+    /* Compute number of bytes left to consume */
+    remain = input_count - used;
+    memmove(input_buffer, input_buffer + used, remain);
+  } else {
+    remain = 0;
+  }
+  /* Read new data */
+  n = read(inputfd, input_buffer + remain, (sizeof input_buffer) - remain);
+  if(n < 0)
+    fatal(errno, "reading from %s", path);
+  /* Compute total number of bytes available */
+  input_count = remain + n;
+  if(input_count)
+    mad_stream_buffer(stream, (unsigned char *)input_buffer, input_count);
+  if(n)
+    return MAD_FLOW_CONTINUE;
+  else
     return MAD_FLOW_STOP;
-  mad_stream_buffer(stream, (unsigned char *)input_buffer, n);
-  return MAD_FLOW_CONTINUE;
 }
 
-
 /** @brief MP3 error callback */
 static enum mad_flow mp3_error(void attribute((unused)) *data,
 			       struct mad_stream *stream,
@@ -274,7 +265,8 @@ static enum mad_flow mp3_error(void attribute((unused)) *data,
 static void decode_mp3(void) {
   struct mad_decoder mad[1];
 
-  open_input();
+  if((inputfd = open(path, O_RDONLY)) < 0)
+    fatal(errno, "opening %s", path);
   mad_decoder_init(mad, 0/*data*/, mp3_input, 0/*header*/, 0/*filter*/,
 		   mp3_output, mp3_error, 0/*message*/);
   if(mad_decoder_run(mad, MAD_DECODER_MODE_SYNC))
@@ -438,13 +430,6 @@ static void help(void) {
   exit(0);
 }
 
-/* Display version number and terminate. */
-static void version(void) {
-  xprintf("%s", disorder_version_string);
-  xfclose(stdout);
-  exit(0);
-}
-
 int main(int argc, char **argv) {
   int n;
   const char *e;
@@ -454,7 +439,7 @@ int main(int argc, char **argv) {
   while((n = getopt_long(argc, argv, "hV", options, 0)) >= 0) {
     switch(n) {
     case 'h': help();
-    case 'V': version();
+    case 'V': version("disorder-decode");
     default: fatal(0, "invalid option");
     }
   }