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264 lines
7 KiB
C
264 lines
7 KiB
C
/* GStreamer Wavpack plugin
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* Copyright (c) 2005 Arwed v. Merkatz <v.merkatz@gmx.net>
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* Copyright (c) 1998 - 2005 Conifer Software
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* Copyright (c) 2006 Sebastian Dröge <slomo@circular-chaos.org>
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*
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* gstwavpackcommon.c: common helper functions
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstwavpackcommon.h"
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#include <string.h>
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#include <gst/gst.h>
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GST_DEBUG_CATEGORY_EXTERN (wavpack_debug);
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#define GST_CAT_DEFAULT wavpack_debug
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gboolean
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gst_wavpack_read_header (WavpackHeader * header, guint8 * buf)
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{
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memmove (header, buf, sizeof (WavpackHeader));
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WavpackLittleEndianToNative (header, (char *) WavpackHeaderFormat);
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return (memcmp (header->ckID, "wvpk", 4) == 0);
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}
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/* inspired by the original one in wavpack */
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gboolean
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gst_wavpack_read_metadata (GstWavpackMetadata * wpmd, guint8 * header_data,
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guint8 ** p_data)
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{
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WavpackHeader hdr;
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guint8 *end;
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gst_wavpack_read_header (&hdr, header_data);
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end = header_data + hdr.ckSize + 8;
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if (end - *p_data < 2)
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return FALSE;
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wpmd->id = GST_READ_UINT8 (*p_data);
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wpmd->byte_length = 2 * (guint) GST_READ_UINT8 (*p_data + 1);
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*p_data += 2;
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if ((wpmd->id & ID_LARGE) == ID_LARGE) {
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guint extra;
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wpmd->id &= ~ID_LARGE;
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if (end - *p_data < 2)
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return FALSE;
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extra = GST_READ_UINT16_LE (*p_data);
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wpmd->byte_length += (extra << 9);
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*p_data += 2;
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}
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if ((wpmd->id & ID_ODD_SIZE) == ID_ODD_SIZE) {
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wpmd->id &= ~ID_ODD_SIZE;
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--wpmd->byte_length;
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}
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if (wpmd->byte_length > 0) {
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if (end - *p_data < wpmd->byte_length + (wpmd->byte_length & 1)) {
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wpmd->data = NULL;
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return FALSE;
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}
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wpmd->data = *p_data;
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*p_data += wpmd->byte_length + (wpmd->byte_length & 1);
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} else {
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wpmd->data = NULL;
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}
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return TRUE;
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}
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gint
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gst_wavpack_get_default_channel_mask (gint nchannels)
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{
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gint channel_mask = 0;
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/* Set the default channel mask for the given number of channels.
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* It's the same as for WAVE_FORMAT_EXTENDED:
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* http://www.microsoft.com/whdc/device/audio/multichaud.mspx
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*/
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switch (nchannels) {
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case 11:
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channel_mask |= 0x00400;
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channel_mask |= 0x00200;
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case 9:
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channel_mask |= 0x00100;
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case 8:
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channel_mask |= 0x00080;
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channel_mask |= 0x00040;
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case 6:
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channel_mask |= 0x00020;
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channel_mask |= 0x00010;
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case 4:
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channel_mask |= 0x00008;
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case 3:
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channel_mask |= 0x00004;
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case 2:
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channel_mask |= 0x00002;
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channel_mask |= 0x00001;
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break;
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case 1:
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/* For mono use front center */
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channel_mask |= 0x00004;
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break;
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}
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return channel_mask;
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}
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static const struct
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{
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const guint32 ms_mask;
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const GstAudioChannelPosition gst_pos;
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} layout_mapping[] = {
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{
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0x00001, GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT}, {
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0x00002, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, {
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0x00004, GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER}, {
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0x00008, GST_AUDIO_CHANNEL_POSITION_LFE1}, {
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0x00010, GST_AUDIO_CHANNEL_POSITION_REAR_LEFT}, {
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0x00020, GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT}, {
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0x00040, GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER}, {
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0x00080, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER}, {
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0x00100, GST_AUDIO_CHANNEL_POSITION_REAR_CENTER}, {
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0x00200, GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT}, {
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0x00400, GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT}, {
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0x00800, GST_AUDIO_CHANNEL_POSITION_TOP_CENTER}, {
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0x01000, GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_LEFT}, {
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0x02000, GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_CENTER}, {
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0x04000, GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_RIGHT}, {
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0x08000, GST_AUDIO_CHANNEL_POSITION_TOP_REAR_LEFT}, {
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0x10000, GST_AUDIO_CHANNEL_POSITION_TOP_REAR_CENTER}, {
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0x20000, GST_AUDIO_CHANNEL_POSITION_TOP_REAR_RIGHT}
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};
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#define MAX_CHANNEL_POSITIONS G_N_ELEMENTS (layout_mapping)
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gboolean
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gst_wavpack_get_channel_positions (gint num_channels, gint layout,
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GstAudioChannelPosition * pos)
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{
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gint i, p;
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if (num_channels == 1 && layout == 0x00004) {
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pos[0] = GST_AUDIO_CHANNEL_POSITION_MONO;
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return TRUE;
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}
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p = 0;
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for (i = 0; i < MAX_CHANNEL_POSITIONS; ++i) {
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if ((layout & layout_mapping[i].ms_mask) != 0) {
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if (p >= num_channels) {
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GST_WARNING ("More bits set in the channel layout map than there "
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"are channels! Broken file");
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return FALSE;
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}
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if (layout_mapping[i].gst_pos == GST_AUDIO_CHANNEL_POSITION_INVALID) {
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GST_WARNING ("Unsupported channel position (mask 0x%08x) in channel "
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"layout map - ignoring those channels", layout_mapping[i].ms_mask);
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/* what to do? just ignore it and let downstream deal with a channel
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* layout that has INVALID positions in it for now ... */
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}
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pos[p] = layout_mapping[i].gst_pos;
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++p;
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}
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}
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if (p != num_channels) {
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GST_WARNING ("Only %d bits set in the channel layout map, but there are "
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"supposed to be %d channels! Broken file", p, num_channels);
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return FALSE;
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}
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return TRUE;
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}
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GstAudioChannelPosition *
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gst_wavpack_get_default_channel_positions (gint nchannels)
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{
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GstAudioChannelPosition *pos = g_new (GstAudioChannelPosition, nchannels);
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gint i;
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if (nchannels == 1) {
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pos[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER;
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return pos;
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}
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for (i = 0; i < nchannels; i++)
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pos[i] = layout_mapping[i].gst_pos;
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return pos;
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}
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gint
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gst_wavpack_get_channel_mask_from_positions (GstAudioChannelPosition * pos,
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gint nchannels)
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{
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gint channel_mask = 0;
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gint i, j;
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if (nchannels == 1 && pos[0] == GST_AUDIO_CHANNEL_POSITION_MONO) {
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channel_mask = 0x00000004;
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return channel_mask;
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}
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/* FIXME: not exactly efficient but otherwise we need an inverse
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* mapping table too */
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for (i = 0; i < nchannels; i++) {
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for (j = 0; j < MAX_CHANNEL_POSITIONS; j++) {
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if (pos[i] == layout_mapping[j].gst_pos) {
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channel_mask |= layout_mapping[j].ms_mask;
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break;
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}
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}
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}
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return channel_mask;
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}
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gboolean
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gst_wavpack_set_channel_mapping (GstAudioChannelPosition * pos, gint nchannels,
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gint8 * channel_mapping)
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{
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gint i, j;
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gboolean ret = TRUE;
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for (i = 0; i < nchannels; i++) {
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for (j = 0; j < MAX_CHANNEL_POSITIONS; j++) {
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if (pos[i] == layout_mapping[j].gst_pos) {
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channel_mapping[i] = j;
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ret &= (i == j);
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break;
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}
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}
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}
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return !ret;
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}
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