From 357f5e11bb0dcf2b40624b3c312833af43dab0a1 Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@systemlinux.org>
Date: Mon, 12 Mar 2007 21:19:37 +0100
Subject: [PATCH] vss.c: Use the file mapping instead of fseek()/read()

---
 vss.c | 55 ++++++++-----------------------------------------------
 1 file changed, 8 insertions(+), 47 deletions(-)

diff --git a/vss.c b/vss.c
index e12176d2..74b0f009 100644
--- a/vss.c
+++ b/vss.c
@@ -43,8 +43,6 @@ static struct timeval autoplay_barrier;
 extern struct misc_meta_data *mmd;
 extern struct audio_file_selector selectors[];
 extern struct sender senders[];
-static char *inbuf;
-static size_t inbuf_size;
 
 static FILE *audio_file = NULL;
 static char *map;
@@ -505,38 +503,6 @@ again:
 	return ret;
 }
 
-/**
- * read a chunk of data from the current audio file
- *
- * \return The length of the chunk on success, zero on end of file, negative on
- * errors.  Note: If the current chunk is of length zero, but the end of the
- * file is not yet reached, this function returns -E_EMPTY_CHUNK.
- */
-ssize_t vss_read_chunk(void)
-{
-	ssize_t len;
-	size_t pos;
-	int ret;
-	long unsigned cc = mmd->current_chunk;
-
-	if (cc >= mmd->afi.chunks_total) /* eof */
-		return 0;
-	len = mmd->afi.chunk_table[cc + 1] - mmd->afi.chunk_table[cc];
-	if (!len) /* nothing to send for this run */
-		return -E_EMPTY_CHUNK;
-	pos = mmd->afi.chunk_table[cc];
-	if (inbuf_size < len) {
-		PARA_INFO_LOG("increasing inbuf for chunk #%lu/%lu to %zu bytes\n",
-			cc, mmd->afi.chunks_total, len);
-		inbuf = para_realloc(inbuf, len);
-		inbuf_size = len;
-	}
-	ret = para_fseek(audio_file, pos, SEEK_SET);
-	if (ret < 0)
-		return ret;
-	return para_fread(inbuf, len, 1, audio_file);
-}
-
 /**
  * main sending function
  *
@@ -550,7 +516,7 @@ void vss_send_chunk(void)
 {
 	int i;
 	struct audio_format_handler *af;
-	ssize_t ret;
+	ssize_t pos, len;
 	struct timeval now, due;
 
 	if (mmd->audio_format < 0 || !audio_file || !vss_playing())
@@ -565,23 +531,17 @@ void vss_send_chunk(void)
 	if (chk_barrier("data send", &now, &data_send_barrier,
 			&due, 1) < 0)
 		return;
-	ret= vss_read_chunk();
 	mmd->new_vss_status_flags &= ~VSS_REPOS;
-	if (!ret || (ret < 0 && ret != -E_EMPTY_CHUNK)) {
-		if (ret < 0) {
-			mmd->new_vss_status_flags = VSS_NEXT;
-			PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
-		} else
-			mmd->new_vss_status_flags |= VSS_NEXT;
-		vss_eof(af);
-		return;
+	if (mmd->current_chunk >= mmd->afi.chunks_total) { /* eof */
+		mmd->new_vss_status_flags |= VSS_NEXT;
+		return vss_eof(af);
 	}
+	pos = mmd->afi.chunk_table[mmd->current_chunk];
+	len = mmd->afi.chunk_table[mmd->current_chunk + 1] - pos;
 	/*
 	 * We call the send function also in case of empty chunks as they
   	 * might have still some data queued which can be sent in this case.
   	 */
-	if (ret < 0)
-		ret = 0;
 	if (!mmd->chunks_sent) {
 		struct timeval tmp;
 		gettimeofday(&mmd->stream_start, NULL);
@@ -590,7 +550,8 @@ void vss_send_chunk(void)
 		mmd->events++;
 	}
 	for (i = 0; senders[i].name; i++)
-		senders[i].send(mmd->current_chunk, mmd->chunks_sent, inbuf, ret);
+		senders[i].send(mmd->current_chunk, mmd->chunks_sent,
+			map + pos, len);
 	mmd->new_vss_status_flags |= VSS_PLAYING;
 	mmd->chunks_sent++;
 	mmd->current_chunk++;
-- 
2.39.2