From: Andre Noll <maan@systemlinux.org>
Date: Tue, 23 Oct 2007 16:19:59 +0000 (+0200)
Subject: Add missing afh_common.c.
X-Git-Tag: v0.3.0~245
X-Git-Url: http://git.tue.mpg.de/?a=commitdiff_plain;h=f445bae93b0e609ac241c1fa3c9c16569ac7cb85;p=paraslash.git

Add missing afh_common.c.

dooh, it's easy to miss including an essential file.
---

diff --git a/afh_common.c b/afh_common.c
new file mode 100644
index 00000000..13bcd0d3
--- /dev/null
+++ b/afh_common.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+/* \file afh_common.c: Common audio format handler functions. */
+
+#include <sys/mman.h> /* mmap */
+#include <sys/time.h> /* gettimeofday */
+#include <sys/types.h>
+#include <dirent.h>
+
+#include "para.h"
+#include "error.h"
+#include "string.h"
+#include "afh.h"
+
+/* The mp3 audio format handler does not need any libs. */
+void mp3_init(struct audio_format_handler *);
+
+#ifdef HAVE_OGGVORBIS
+	void ogg_init(struct audio_format_handler *);
+#endif
+#ifdef HAVE_FAAD
+	void aac_afh_init(struct audio_format_handler *);
+#endif
+
+/**
+ * The list of supported  audio formats.
+ *
+ * We always define the full array of audio formats even if some audio formats
+ * were not compiled in. This is because for each audio file the number of its
+ * audio format is stored in the database. We don't want that numbers to become
+ * stale just because the user installed a new version of paraslash that
+ * supports a different set of audio formats.
+ *
+ * It can still be easily detected whether an audio format is compiled in by
+ * checking if the init function pointer is not \p NULL.
+ */
+static struct audio_format_handler afl[] = {
+	{
+		.name = "mp3",
+		.init = mp3_init,
+	},
+	{
+		.name = "ogg",
+#ifdef HAVE_OGGVORBIS
+		.init = ogg_init,
+#endif
+	},
+	{
+		.name = "aac",
+#ifdef HAVE_FAAD
+		.init = aac_afh_init,
+#endif
+	},
+	{
+		.name = NULL,
+	}
+};
+
+static inline int next_audio_format(int format)
+{
+	for (;;) {
+		if (!afl[format].name)
+			return format;
+		format++;
+		if (afl[format].init)
+			return format;
+	}
+
+}
+
+/** Iterate over each supported audio format. */
+#define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i = next_audio_format(i))
+
+void afh_init(void)
+{
+	int i;
+
+	PARA_DEBUG_LOG("supported audio formats: %s\n",
+		SUPPORTED_AUDIO_FORMATS);
+	FOR_EACH_AUDIO_FORMAT(i) {
+		PARA_NOTICE_LOG("initializing %s handler\n",
+			audio_format_name(i));
+		afl[i].init(&afl[i]);
+	}
+}
+
+
+/**
+ * guess the audio format judging from filename
+ *
+ * \param name the filename
+ *
+ * \return This function returns -1 if it has no idea what kind of audio
+ * file this might be. Otherwise the (non-negative) number of the audio format
+ * is returned.
+ */
+int guess_audio_format(const char *name)
+{
+	int i,j, len = strlen(name);
+
+	FOR_EACH_AUDIO_FORMAT(i) {
+		for (j = 0; afl[i].suffixes[j]; j++) {
+			const char *p = afl[i].suffixes[j];
+			int plen = strlen(p);
+			if (len < plen + 1)
+				continue;
+			if (name[len - plen - 1] != '.')
+				continue;
+			if (strcasecmp(name + len - plen, p))
+				continue;
+//			PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
+			return i;
+		}
+	}
+	return -E_BAD_AUDIO_FILE_SUFFIX;
+}
+
+/**
+ * Call get_file_info() to obtain an afhi structure.
+ *
+ * \param path The full path of the audio file.
+ * \param data Pointer to the contents of the (mapped) file.
+ * \param size The file size in bytes.
+ * \param afhi Result pointer.
+ *
+ * \return The number of the audio format on success, \p -E_AUDIO_FORMAT if no
+ * compiled in audio format handler is able to handler the file.
+ *
+ * This function tries to find an audio format handler that can interpret the
+ * file given by \a data and \a size.
+ *
+ * It first tries to determine the audio format from the filename given by \a
+ * path. If this doesn't work, all other audio format handlers are tried until
+ * one is found that can handle the file.
+ */
+int compute_afhi(const char *path, char *data, size_t size,
+		struct audio_format_info *afhi)
+{
+	int ret, i, format = guess_audio_format(path);
+
+	if (format >= 0) {
+		ret = afl[format].get_file_info(data, size, afhi);
+		if (ret >= 0)
+			return format;
+	}
+	FOR_EACH_AUDIO_FORMAT(i) {
+		if (i == format) /* we already tried this one to no avail */
+			continue;
+		ret = afl[i].get_file_info(data, size, afhi);
+		if (ret >= 0)
+			return i;
+		PARA_WARNING_LOG("%s\n", PARA_STRERROR(-ret));
+	}
+	return -E_AUDIO_FORMAT;
+}
+
+/**
+ * Get the name of the given audio format.
+ *
+ * \param i The audio format number.
+ *
+ * This returns a pointer to statically allocated memory so it
+ * must not be freed by the caller.
+ */
+const char *audio_format_name(int i)
+{
+	//PARA_NOTICE_LOG("array size: %u¸ requested: %d\n", ARRAY_SIZE(afl), i);
+	assert(i < 0 || i < ARRAY_SIZE(afl) - 1);
+	return i >= 0?  afl[i].name : "(none)";
+}
+