input_cdda_plugin: new plugin to handle cdda:// protocol to access CD-DA audio CD's

src/input/cdda_input_plugin.c

+/*
+ * Copyright (C) 2003-2010 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/**
+  * CD-Audio handling (requires libcdio_paranoia)
+  */
+
+#include "config.h"
+#include "input_plugin.h"
+#include "refcount.h"
+#include "pcm_buffer.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdlib.h>
+#include <glib.h>
+#include <assert.h>
+
+#include <cdio/paranoia.h>
+#include <cdio/cd_types.h>
+
+struct input_cdda {
+	struct input_stream base;
+
+	cdrom_drive_t *drv;
+	CdIo_t *cdio;
+	cdrom_paranoia_t *para;
+
+	int endian;
+
+	lsn_t lsn_from, lsn_to;
+	int lsn_relofs;
+
+	int trackno;
+
+	char buffer[CDIO_CD_FRAMESIZE_RAW];
+	int buffer_lsn;
+
+	struct pcm_buffer conv_buffer;
+};
+
+static const struct input_plugin cdda_inputplugin;
+
+static inline GQuark
+cdda_quark(void)
+{
+	return g_quark_from_static_string("cdda");
+}
+
+static void
+input_cdda_close(struct input_stream *is)
+{
+	struct input_cdda *i = (struct input_cdda *)is;
+
+	pcm_buffer_deinit(&i->conv_buffer);
+
+	if (i->para)
+		cdio_paranoia_free(i->para);
+	if (i->drv)
+		cdio_cddap_close_no_free_cdio( i->drv);
+	if (i->cdio)
+		cdio_destroy( i->cdio );
+
+	input_stream_deinit(&i->base);
+	g_free(i);
+}
+
+static struct input_stream *
+input_cdda_open(const char *uri, GError **error_r)
+{
+	struct input_cdda *i;
+	int idx;
+	char **cd_drives;  /* List of all drives with a loaded CDDA in it. */
+
+	if (!g_str_has_prefix(uri, "cdda://"))
+		return NULL;
+
+	i = g_new(struct input_cdda, 1);
+	input_stream_init(&i->base, &input_plugin_cdda, uri);
+
+	/* initialize everything (should be already) */
+	i->drv = NULL;
+	i->cdio = NULL;
+	i->para = NULL;
+	pcm_buffer_init(&i->conv_buffer);
+
+	if (parse_cdda_uri(uri, &drive, &trackno) == -1) {
+		g_set_error(error_r, cdda_quark(), 0,
+			    "Unable parse URI\n");
+		input_cdda_close(i);
+		return NULL;
+	}
+
+	/* get list of CD's supporting CD-DA */
+	cd_drives = cdio_get_devices_with_cap(NULL, CDIO_FS_AUDIO, false);
+	if (!cd_drives) {
+		g_set_error(error_r, cdda_quark(), 0,
+			    "Unable find or access a CD-ROM drive with an audio CD in it.\n");
+		input_cdda_close(i);
+		return NULL;
+	}
+
+	/* list all available drives */
+	idx = 0;
+	while (cd_drives[idx] != NULL) {
+		g_debug("CD drive: %s\n", cd_drives[idx++]);
+	}
+
+	/* Found such a CD-ROM with a CD-DA loaded. Use the first drive in the list. */
+	i->cdio = cdio_open(*cd_drives, DRIVER_UNKNOWN);
+	i->drv = cdio_cddap_identify_cdio(i->cdio, 1, NULL);
+
+	/* Don't need a list of CD's with CD-DA's any more. */
+	cdio_free_device_list(cd_drives);
+
+	if ( !i->drv ) {
+		g_set_error(error_r, cdda_quark(), 0, "Unable to identify audio CD disc.\n");
+		input_cdda_close(i);
+		return NULL;
+	}
+
+	/* We'll set for verbose paranoia messages. */
+	cdda_verbose_set(i->drv, CDDA_MESSAGE_PRINTIT, CDDA_MESSAGE_PRINTIT);
+
+	if ( 0 != cdio_cddap_open(i->drv) ) {
+		g_set_error(error_r, cdda_quark(), 0, "Unable to open disc.\n");
+		input_cdda_close(i);
+		return NULL;
+	}
+
+	i->endian = data_bigendianp(i->drv);
+	switch (i->endian) {
+	case -1:
+		g_debug("cdda: drive returns unknown audio data, assuming Little Endian\n");
+		i->endian = 0;
+		break;
+	case 0:
+		g_debug("cdda: drive returns audio data Little Endian.");
+		break;
+	case 1:
+		g_debug("cdda: drive returns audio data Big Endian.\n");
+		break;
+	default:
+		g_set_error(error_r, cdda_quark(), 0, "Drive returns unknown data type %d.\n", i->endian);
+		input_cdda_close(i)
+		return NULL;
+	}
+
+	g_debug("Disc last LSN: %d\n", cdio_get_disc_last_lsn(i->cdio));
+
+	tracks      = cdio_get_num_tracks(i->cdio);
+	first_track = cdio_get_first_track_num(i->cdio);
+
+	{
+		int ti, j, tracks, first_track;
+
+		g_debug("CD-ROM Track List (%i - %i)\n", first_track, first_track+tracks-1);
+		g_debug("  #:  LSN\n");
+
+		/* generate track listing */
+		for (j = 0, ti = first_track; j < tracks; ti++, j++) {
+			lsn_t lsn = cdio_get_track_lsn(i->cdio, ti);
+			if (CDIO_INVALID_LSN != lsn) {
+				g_debug("%3d: %06lu\n", (int) ti, (long unsigned int) lsn);
+			}
+		}
+		g_debug("%3X: %06lu  leadout\n", CDIO_CDROM_LEADOUT_TRACK,
+			(long unsigned int) cdio_get_track_lsn(i->cdio,
+							       CDIO_CDROM_LEADOUT_TRACK));
+	}
+
+	if (i->trackno == -1) {
+		g_set_error(error_r, cdda_quark(), 0,
+			    "Invalid track # in %s", uri);
+		input_cdda_close(i);
+		return NULL;
+	}
+
+
+	i->lsn_relofs = 0;
+	i->lsn_from = cdio_get_track_lsn( i->cdio, i->trackno );
+	i->lsn_to = cdio_get_track_last_lsn( i->cdio, i->trackno );
+
+	i->para = cdio_paranoia_init(i->drv);
+
+	/* Set reading mode for full paranoia, but allow skipping sectors. */
+	paranoia_modeset(i->para, PARANOIA_MODE_FULL^PARANOIA_MODE_NEVERSKIP);
+
+	/* seek to beginning of the track */
+	cdio_paranoia_seek(i->para, i->lsn_from, SEEK_SET);
+
+	i->eof = false;
+
+	i->base.ready = true;
+	i->base.seekable = true;
+	i->base.size = (i->lsn_to - i->lsn_from + 1) * CDIO_CD_FRAMESIZE_RAW;
+
+	/* hack to make MPD select the "pcm" decoder plugin */
+	i->base.mime = g_strdup("audio/x-mpd-cdda-pcm");
+
+	return &i->base;
+}
+
+
+/* single archive handling */
+static int
+input_cdda_archive_extract_trackno(const char *path)
+{
+	long value;
+	char *endptr, *str;
+
+	//remove .wav
+	str = strrchr(path, '.');
+	if (str)
+		*str = 0;
+
+	//remove leading 0's
+	while (*path == '0')
+		path++;
+
+	value = strtol(path, &endptr, 0);
+	if (*endptr != 0 || value < 0) {
+		return -1;
+	}
+	return value;
+}
+
+static bool
+input_cdda_seek(struct input_stream *is,
+		goffset offset, int whence, GError **error_r)
+{
+	struct input_cdda *cis = (struct input_cdda *)is;
+
+	/* calculate absolute offset */
+	switch (whence) {
+	case SEEK_SET:
+		break;
+	case SEEK_CUR:
+		offset += cis->base.offset;
+		break;
+	case SEEK_END:
+		offset += cis->base.size;
+		break;
+	}
+
+	if (offset < 0 || offset > cis->base.size) {
+		g_set_error(error_r, cdda_quark(), 0,
+			    "Invalid offset to seek %ld (%ld)",
+			    (long int)offset, (long int)cis->base.size);
+		return false;
+	}
+
+	/* simple case */
+	if (offset == cis->base.offset)
+		return true;
+
+	/* calculate current LSN */
+	cis->lsn_relofs = offset / CDIO_CD_FRAMESIZE_RAW;
+	cis->base.offset = offset;
+
+	cdio_paranoia_seek(cis->para, cis->lsn_from + cis->lsn_relofs, SEEK_SET);
+
+	return true;
+}
+
+static size_t
+input_cdda_read(struct input_stream *is, void *ptr, size_t length,
+		GError **error_r)
+{
+	struct input_cdda *cis = (struct input_cdda *)is;
+	size_t nbytes = 0;
+	int diff;
+	size_t len, maxwrite;
+	int16_t *rbuf;
+	char *s_err, *s_mess;
+	char *wptr = (char *) ptr;
+
+	while (length > 0) {
+
+
+		/* end of track ? */
+		if (cis->lsn_from + cis->lsn_relofs > cis->lsn_to)
+			break;
+
+		//current sector was changed ?
+		if (cis->lsn_relofs != cis->buffer_lsn) {
+			rbuf = cdio_paranoia_read(cis->para, NULL);
+
+			s_err = cdda_errors(cis->archive->drv);
+			if (s_err) {
+				g_warning("paranoia_read: %s\n", s_err );
+				free(s_err);
+			}
+			s_mess = cdda_messages(cis->archive->drv);
+			if (s_mess) {
+				g_debug("paranoia_read: %s\n", s_mess );
+				free(s_mess);
+			}
+			if (!rbuf) {
+				g_set_error(error_r, cdda_quark(), 0,
+					"paranoia read error. Stopping.\n");
+				return 0;
+			}
+			//do the swapping if nessesary
+			if (cis->archive->endian != 0) {
+				g_debug("swap\n");
+				uint16_t *conv_buffer = pcm_buffer_get(&cis->conv_buffer, CDIO_CD_FRAMESIZE_RAW );
+				/* do endian conversion ! */
+				pcm16_to_wave( conv_buffer, (uint16_t*) rbuf, CDIO_CD_FRAMESIZE_RAW);
+				rbuf = (int16_t *)conv_buffer;
+			}
+			//store current buffer
+			memcpy(cis->buffer, rbuf, CDIO_CD_FRAMESIZE_RAW);
+			cis->buffer_lsn = cis->lsn_relofs;
+		} else {
+			//use cached sector
+			rbuf = (int16_t*) cis->buffer;
+		}
+
+		//correct offset
+		diff = cis->base.offset - cis->lsn_relofs * CDIO_CD_FRAMESIZE_RAW;
+
+		assert(diff >= 0 && diff < CDIO_CD_FRAMESIZE_RAW);
+
+		maxwrite = CDIO_CD_FRAMESIZE_RAW - diff;  //# of bytes pending in current buffer
+		len = (length < maxwrite? length : maxwrite);
+
+		//skip diff bytes from this lsn
+		memcpy(wptr, ((char*)rbuf) + diff, len);
+		//update pointer
+		wptr += len;
+		nbytes += len;
+
+		//update offset
+		cis->base.offset += len;
+		cis->lsn_relofs = cis->base.offset / CDIO_CD_FRAMESIZE_RAW;
+		//update length
+		length -= len;
+	}
+
+	return nbytes;
+}
+
+static bool
+input_cdda_eof(struct input_stream *is)
+{
+	struct input_cdda *cis = (struct input_cdda *)is;
+
+	return (cis->lsn_from + cis->lsn_relofs > cis->lsn_to);
+}
+
+
+static const struct input_plugin input_plugin_cdda = {
+	.open = input_cdda_open,
+	.close = input_cdda_close,
+	.seek = input_cdda_seek,
+	.read = input_cdda_read,
+	.eof = input_cdda_eof
+};
+

src/input/cdda_input_plugin.h

+/*
+ * Copyright (C) 2003-2010 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_CDDA_INPUT_PLUGIN_H
+#define MPD_CDDA_INPUT_PLUGIN_H
+
+/**
+ * An input plugin based on libcdio_paranoia library.
+ */
+extern const struct input_plugin input_plugin_cdda;
+
+#endif