1 /* GStreamer Wavpack plugin
2 * Copyright (c) 2005 Arwed v. Merkatz <v.merkatz@gmx.net>
3 * Copyright (c) 1998 - 2005 Conifer Software
4 * Copyright (c) 2006 Sebastian Dröge <slomo@circular-chaos.org>
6 * gstwavpackcommon.c: common helper functions
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
28 #include "gstwavpackcommon.h"
33 GST_DEBUG_CATEGORY_EXTERN (wavpack_debug);
34 #define GST_CAT_DEFAULT wavpack_debug
37 gst_wavpack_read_header (WavpackHeader * header, guint8 * buf)
39 g_memmove (header, buf, sizeof (WavpackHeader));
41 #ifndef WAVPACK_OLD_API
42 WavpackLittleEndianToNative (header, (char *) WavpackHeaderFormat);
44 little_endian_to_native (header, WavpackHeaderFormat);
47 return (memcmp (header->ckID, "wvpk", 4) == 0);
50 /* inspired by the original one in wavpack */
52 gst_wavpack_read_metadata (GstWavpackMetadata * wpmd, guint8 * header_data,
58 gst_wavpack_read_header (&hdr, header_data);
59 end = header_data + hdr.ckSize + 8;
61 if (end - *p_data < 2)
64 wpmd->id = GST_READ_UINT8 (*p_data);
65 wpmd->byte_length = 2 * (guint) GST_READ_UINT8 (*p_data + 1);
69 if ((wpmd->id & ID_LARGE) == ID_LARGE) {
72 wpmd->id &= ~ID_LARGE;
74 if (end - *p_data < 2)
77 extra = GST_READ_UINT16_LE (*p_data);
78 wpmd->byte_length += (extra << 9);
82 if ((wpmd->id & ID_ODD_SIZE) == ID_ODD_SIZE) {
83 wpmd->id &= ~ID_ODD_SIZE;
87 if (wpmd->byte_length > 0) {
88 if (end - *p_data < wpmd->byte_length + (wpmd->byte_length & 1)) {
94 *p_data += wpmd->byte_length + (wpmd->byte_length & 1);
103 gst_wavpack_get_default_channel_mask (gint nchannels)
105 gint channel_mask = 0;
107 /* Set the default channel mask for the given number of channels.
108 * It's the same as for WAVE_FORMAT_EXTENDED:
109 * http://www.microsoft.com/whdc/device/audio/multichaud.mspx
113 channel_mask |= 0x00400;
114 channel_mask |= 0x00200;
116 channel_mask |= 0x00100;
118 channel_mask |= 0x00080;
119 channel_mask |= 0x00040;
121 channel_mask |= 0x00020;
122 channel_mask |= 0x00010;
124 channel_mask |= 0x00008;
126 channel_mask |= 0x00004;
128 channel_mask |= 0x00002;
129 channel_mask |= 0x00001;
132 /* For mono use front center */
133 channel_mask |= 0x00004;
142 const guint32 ms_mask;
143 const GstAudioChannelPosition gst_pos;
144 } layout_mapping[] = {
146 0x00001, GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT}, {
147 0x00002, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, {
148 0x00004, GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER}, {
149 0x00008, GST_AUDIO_CHANNEL_POSITION_LFE1}, {
150 0x00010, GST_AUDIO_CHANNEL_POSITION_REAR_LEFT}, {
151 0x00020, GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT}, {
152 0x00040, GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER}, {
153 0x00080, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER}, {
154 0x00100, GST_AUDIO_CHANNEL_POSITION_REAR_CENTER}, {
155 0x00200, GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT}, {
156 0x00400, GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT}, {
157 0x00800, GST_AUDIO_CHANNEL_POSITION_TOP_CENTER}, {
158 0x01000, GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_LEFT}, {
159 0x02000, GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_CENTER}, {
160 0x04000, GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_RIGHT}, {
161 0x08000, GST_AUDIO_CHANNEL_POSITION_TOP_REAR_LEFT}, {
162 0x10000, GST_AUDIO_CHANNEL_POSITION_TOP_REAR_CENTER}, {
163 0x20000, GST_AUDIO_CHANNEL_POSITION_TOP_REAR_RIGHT}
166 #define MAX_CHANNEL_POSITIONS G_N_ELEMENTS (layout_mapping)
169 gst_wavpack_get_channel_positions (gint num_channels, gint layout,
170 GstAudioChannelPosition * pos)
174 if (num_channels == 1 && layout == 0x00004) {
175 pos[0] = GST_AUDIO_CHANNEL_POSITION_MONO;
180 for (i = 0; i < MAX_CHANNEL_POSITIONS; ++i) {
181 if ((layout & layout_mapping[i].ms_mask) != 0) {
182 if (p >= num_channels) {
183 GST_WARNING ("More bits set in the channel layout map than there "
184 "are channels! Broken file");
187 if (layout_mapping[i].gst_pos == GST_AUDIO_CHANNEL_POSITION_INVALID) {
188 GST_WARNING ("Unsupported channel position (mask 0x%08x) in channel "
189 "layout map - ignoring those channels", layout_mapping[i].ms_mask);
190 /* what to do? just ignore it and let downstream deal with a channel
191 * layout that has INVALID positions in it for now ... */
193 pos[p] = layout_mapping[i].gst_pos;
198 if (p != num_channels) {
199 GST_WARNING ("Only %d bits set in the channel layout map, but there are "
200 "supposed to be %d channels! Broken file", p, num_channels);
207 GstAudioChannelPosition *
208 gst_wavpack_get_default_channel_positions (gint nchannels)
210 GstAudioChannelPosition *pos = g_new (GstAudioChannelPosition, nchannels);
213 if (nchannels == 1) {
214 pos[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER;
218 for (i = 0; i < nchannels; i++)
219 pos[i] = layout_mapping[i].gst_pos;
225 gst_wavpack_get_channel_mask_from_positions (GstAudioChannelPosition * pos,
228 gint channel_mask = 0;
231 if (nchannels == 1 && pos[0] == GST_AUDIO_CHANNEL_POSITION_MONO) {
232 channel_mask = 0x00000004;
236 /* FIXME: not exactly efficient but otherwise we need an inverse
237 * mapping table too */
238 for (i = 0; i < nchannels; i++) {
239 for (j = 0; j < MAX_CHANNEL_POSITIONS; j++) {
240 if (pos[i] == layout_mapping[j].gst_pos) {
241 channel_mask |= layout_mapping[j].ms_mask;
251 gst_wavpack_set_channel_mapping (GstAudioChannelPosition * pos, gint nchannels,
252 gint8 * channel_mapping)
257 for (i = 0; i < nchannels; i++) {
258 for (j = 0; j < MAX_CHANNEL_POSITIONS; j++) {
259 if (pos[i] == layout_mapping[j].gst_pos) {
260 channel_mapping[i] = j;