core: Add a pa_format_info structure

This will be used to represent the format of data provided by the client
for both compressed and PCM formats in a new extended API.

src/pulse/format.h

@@ -0,0 +1,79 @@
+#ifndef fooformathfoo
+#define fooformathfoo
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2011 Intel Corporation
+  Copyright 2011 Collabora Multimedia
+  Copyright 2011 Arun Raghavan <arun.raghavan@collabora.co.uk>
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2.1 of the License,
+  or (at your option) any later version.
+
+  PulseAudio 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 Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#include <pulse/cdecl.h>
+#include <pulse/proplist.h>
+
+PA_C_DECL_BEGIN
+
+/**< Represents the type of encoding used in a stream or accepted by a sink. \since 1.0 */
+typedef enum pa_encoding {
+    PA_ENCODING_ANY,
+    /**< Any encoding format, PCM or compressed */
+
+    PA_ENCODING_PCM,
+    /**< Any PCM format */
+
+    PA_ENCODING_AC3_IEC61937,
+    /**< AC3 data encapsulated in IEC 61937 header/padding */
+
+    PA_ENCODING_EAC3_IEC61937,
+    /**< EAC3 data encapsulated in IEC 61937 header/padding */
+
+    PA_ENCODING_MPEG_IEC61937,
+    /**< MPEG-1 or MPEG-2 (Part 3, not AAC) data encapsulated in IEC 61937 header/padding */
+
+    PA_ENCODING_MAX,
+    /**< Valid encoding types must be less than this value */
+
+    PA_ENCODING_INVALID = -1,
+    /**< Represents an invalid encoding */
+} pa_encoding_t;
+
+/**< Represents the format of data provided in a stream or processed by a sink. \since 1.0 */
+typedef struct pa_format_info {
+    pa_encoding_t encoding;
+    /**< The encoding used for the format */
+
+    pa_proplist *plist;
+    /**< Additional encoding-specific properties such as sample rate, bitrate, etc. */
+} pa_format_info;
+
+/**< Allocates a new \a pa_format_info structure. Clients must initialise at least the encoding field themselves. */
+pa_format_info* pa_format_info_new(void);
+
+/**< Returns a new \a pa_format_info struct and representing the same format as \a src */
+pa_format_info* pa_format_info_copy(const pa_format_info *src);
+
+/**< Frees a \a pa_format_info structure */
+void pa_format_info_free(pa_format_info *f);
+
+/** Returns non-zero when the format info structure is valid */
+int pa_format_info_valid(pa_format_info *f);
+
+PA_C_DECL_END
+
+#endif