gstreamer/ext/cdio/gstcdiocddasrc.c

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/* GStreamer
* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-cdiocddasrc
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* @see_also: GstCdParanoiaSrc, GstAudioCdSrc
*
* <refsect2>
* <para>
* cdiocddasrc reads and extracts raw audio from Audio CDs. It can operate
* in one of two modes:
* <itemizedlist>
* <listitem><para>
* treat each track as a separate stream, counting time from the start
* of the track to the end of the track and posting EOS at the end of
* a track, or
* </para></listitem>
* <listitem><para>
* treat the entire disc as one stream, counting time from the start of
* the first track to the end of the last track, posting EOS only at
* the end of the last track.
* </para></listitem>
* </itemizedlist>
* </para>
* <para>
* With a recent-enough version of libcdio, the element will extract
* CD-TEXT if this is supported by the CD-drive and CD-TEXT information
* is available on the CD. The information will be posted on the bus in
* form of a tag message.
* </para>
* <para>
* When opened, the element will also calculate a CDDB disc ID and a
* MusicBrainz disc ID, which applications can use to query online
* databases for artist/title information. These disc IDs will also be
* posted on the bus as part of the tag messages.
* </para>
* <para>
* cdiocddasrc supports the GstUriHandler interface, so applications can use
* playbin with cdda://&lt;track-number&gt; URIs for playback (they will have
* to connect to playbin's notify::source signal and set the device on the
* cd source in the notify callback if they want to set the device property).
* Applications should use seeks in "track" format to switch between different
* tracks of the same CD (passing a new cdda:// URI to playbin involves opening
* and closing the CD device, which is much slower).
* </para>
* <title>Example launch line</title>
* <para>
* <programlisting>
* gst-launch cdiocddasrc track=5 device=/dev/cdrom ! audioconvert ! vorbisenc ! oggmux ! filesink location=track5.ogg
* </programlisting>
* This pipeline extracts track 5 of the audio CD and encodes it into an
* Ogg/Vorbis file.
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstcdio.h"
#include "gstcdiocddasrc.h"
#include <gst/gst.h>
#include "gst/gst-i18n-plugin.h"
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#define SAMPLES_PER_SECTOR (CDIO_CD_FRAMESIZE_RAW / sizeof (gint16))
#define DEFAULT_READ_SPEED -1
enum
{
PROP_0 = 0,
PROP_READ_SPEED
};
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G_DEFINE_TYPE (GstCdioCddaSrc, gst_cdio_cdda_src, GST_TYPE_AUDIO_CD_SRC);
static void gst_cdio_cdda_src_finalize (GObject * obj);
static void gst_cdio_cdda_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_cdio_cdda_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
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static GstBuffer *gst_cdio_cdda_src_read_sector (GstAudioCdSrc * src,
gint sector);
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static gboolean gst_cdio_cdda_src_open (GstAudioCdSrc * src,
const gchar * device);
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static void gst_cdio_cdda_src_close (GstAudioCdSrc * src);
#if 0
static gchar *
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gst_cdio_cdda_src_get_default_device (GstAudioCdSrc * audiocdsrc)
{
GstCdioCddaSrc *src;
gchar *default_device, *ret;
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src = GST_CDIO_CDDA_SRC (audiocdsrc);
/* src->cdio may be NULL here */
default_device = cdio_get_default_device (src->cdio);
ret = g_strdup (default_device);
free (default_device);
GST_LOG_OBJECT (src, "returning default device: %s", GST_STR_NULL (ret));
return ret;
}
static gchar **
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gst_cdio_cdda_src_probe_devices (GstAudioCdSrc * audiocdsrc)
{
char **devices, **ret, **d;
/* FIXME: might return the same hardware device twice, e.g.
* as /dev/cdrom and /dev/dvd - gotta do something more sophisticated */
devices = cdio_get_devices (DRIVER_DEVICE);
if (devices == NULL)
goto no_devices;
if (*devices == NULL)
goto empty_devices;
ret = g_strdupv (devices);
for (d = devices; *d != NULL; ++d) {
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GST_DEBUG_OBJECT (audiocdsrc, "device: %s", GST_STR_NULL (*d));
free (*d);
}
free (devices);
return ret;
/* ERRORS */
no_devices:
{
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GST_DEBUG_OBJECT (audiocdsrc, "no devices found");
return NULL;
}
empty_devices:
{
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GST_DEBUG_OBJECT (audiocdsrc, "empty device list found");
free (devices);
return NULL;
}
}
#endif
static GstBuffer *
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gst_cdio_cdda_src_read_sector (GstAudioCdSrc * audiocdsrc, gint sector)
{
GstCdioCddaSrc *src;
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guint8 *data;
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src = GST_CDIO_CDDA_SRC (audiocdsrc);
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data = g_malloc (CDIO_CD_FRAMESIZE_RAW);
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/* can't use pad_alloc because we can't return the GstFlowReturn (FIXME 0.11) */
if (cdio_read_audio_sector (src->cdio, data, sector) != 0)
goto read_failed;
if (src->swap_le_be) {
gint16 *pcm_data = (gint16 *) data;
gint i;
for (i = 0; i < SAMPLES_PER_SECTOR; ++i)
pcm_data[i] = GUINT16_SWAP_LE_BE (pcm_data[i]);
}
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return gst_buffer_new_wrapped (data, CDIO_CD_FRAMESIZE_RAW);
/* ERRORS */
read_failed:
{
GST_WARNING_OBJECT (src, "read at sector %d failed!", sector);
GST_ELEMENT_ERROR (src, RESOURCE, READ,
(_("Could not read from CD.")),
("cdio_read_audio_sector at %d failed: %s", sector,
g_strerror (errno)));
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g_free (data);
return NULL;
}
}
static gboolean
gst_cdio_cdda_src_do_detect_drive_endianness (GstCdioCddaSrc * src, gint from,
gint to)
{
gint16 pcm_data[SAMPLES_PER_SECTOR], last_pcm_ne, last_pcm_oe;
gdouble ne_sumd0, ne_sumd1, ne_factor;
gdouble oe_sumd0, oe_sumd1, oe_factor;
gdouble diff;
gint sector;
gint i;
ne_sumd0 = ne_sumd1 = 0.0;
oe_sumd0 = oe_sumd1 = 0.0;
last_pcm_ne = 0;
last_pcm_oe = 0;
GST_LOG_OBJECT (src, "checking sector %d to %d", from, to);
for (sector = from; sector < to; ++sector) {
if (cdio_read_audio_sector (src->cdio, pcm_data, sector) != 0)
goto read_failed;
/* only evaluate samples for left channel */
for (i = 0; i < SAMPLES_PER_SECTOR; i += 2) {
gint16 pcm;
/* Native endianness first */
pcm = pcm_data[i];
ne_sumd0 += abs (pcm);
ne_sumd1 += abs (pcm - last_pcm_ne);
last_pcm_ne = pcm;
/* other endianness next */
pcm = GUINT16_SWAP_LE_BE (pcm);
oe_sumd0 += abs (pcm);
oe_sumd1 += abs (pcm - last_pcm_oe);
last_pcm_oe = pcm;
}
}
ne_factor = (ne_sumd1 / ne_sumd0);
oe_factor = (oe_sumd1 / oe_sumd0);
diff = ne_factor - oe_factor;
GST_DEBUG_OBJECT (src, "Native: %.2f, Other: %.2f, diff: %.2f",
ne_factor, oe_factor, diff);
if (diff > 0.5) {
GST_INFO_OBJECT (src, "Drive produces samples in other endianness");
src->swap_le_be = TRUE;
return TRUE;
} else if (diff < -0.5) {
GST_INFO_OBJECT (src, "Drive produces samples in host endianness");
src->swap_le_be = FALSE;
return TRUE;
} else {
GST_INFO_OBJECT (src, "Inconclusive, assuming host endianness");
src->swap_le_be = FALSE;
return FALSE;
}
/* ERRORS */
read_failed:
{
GST_WARNING_OBJECT (src, "could not read sector %d", sector);
src->swap_le_be = FALSE;
return FALSE;
}
}
static void
gst_cdio_cdda_src_detect_drive_endianness (GstCdioCddaSrc * src, gint first,
gint last)
{
gint from, to;
GST_INFO ("Detecting drive endianness");
/* try middle of disc first */
from = (first + last) / 2;
to = MIN (from + 10, last);
if (gst_cdio_cdda_src_do_detect_drive_endianness (src, from, to))
return;
/* if that was inconclusive, try other places */
from = (first + last) / 4;
to = MIN (from + 10, last);
if (gst_cdio_cdda_src_do_detect_drive_endianness (src, from, to))
return;
from = (first + last) * 3 / 4;
to = MIN (from + 10, last);
if (gst_cdio_cdda_src_do_detect_drive_endianness (src, from, to))
return;
/* if that's still inconclusive, we give up and assume host endianness */
return;
}
static gboolean
notcdio_track_is_audio_track (const CdIo * p_cdio, track_t i_track)
{
return (cdio_get_track_format (p_cdio, i_track) == TRACK_FORMAT_AUDIO);
}
static gboolean
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gst_cdio_cdda_src_open (GstAudioCdSrc * audiocdsrc, const gchar * device)
{
GstCdioCddaSrc *src;
discmode_t discmode;
gint first_track, num_tracks, i;
gint first_audio_sector = 0, last_audio_sector = 0;
#if LIBCDIO_VERSION_NUM > 83
cdtext_t *cdtext;
#endif
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src = GST_CDIO_CDDA_SRC (audiocdsrc);
g_assert (device != NULL);
g_assert (src->cdio == NULL);
GST_LOG_OBJECT (src, "trying to open device %s", device);
if (!(src->cdio = cdio_open (device, DRIVER_UNKNOWN)))
goto open_failed;
discmode = cdio_get_discmode (src->cdio);
GST_LOG_OBJECT (src, "discmode: %d", (gint) discmode);
if (discmode != CDIO_DISC_MODE_CD_DA && discmode != CDIO_DISC_MODE_CD_MIXED)
goto not_audio;
first_track = cdio_get_first_track_num (src->cdio);
num_tracks = cdio_get_num_tracks (src->cdio);
if (num_tracks <= 0 || first_track < 0)
return TRUE; /* base class will generate 'has no tracks' error */
if (src->read_speed != -1)
cdio_set_speed (src->cdio, src->read_speed);
#if LIBCDIO_VERSION_NUM > 83
cdtext = cdio_get_cdtext (src->cdio);
if (NULL == cdtext)
GST_DEBUG_OBJECT (src, "no CD-TEXT on disc");
else
gst_cdio_add_cdtext_album_tags (GST_OBJECT_CAST (src), cdtext,
audiocdsrc->tags);
#else
gst_cdio_add_cdtext_album_tags (GST_OBJECT_CAST (src), src->cdio,
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audiocdsrc->tags);
#endif
GST_LOG_OBJECT (src, "%u tracks, first track: %d", num_tracks, first_track);
for (i = 0; i < num_tracks; ++i) {
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GstAudioCdSrcTrack track = { 0, };
gint len_sectors;
len_sectors = cdio_get_track_sec_count (src->cdio, i + first_track);
track.num = i + first_track;
track.is_audio = notcdio_track_is_audio_track (src->cdio, i + first_track);
/* Note: LSN/LBA confusion all around us; in any case, this does
* the right thing here (for cddb id calculations etc. as well) */
track.start = cdio_get_track_lsn (src->cdio, i + first_track);
track.end = track.start + len_sectors - 1; /* -1? */
if (track.is_audio) {
first_audio_sector = MIN (first_audio_sector, track.start);
last_audio_sector = MAX (last_audio_sector, track.end);
}
#if LIBCDIO_VERSION_NUM > 83
if (NULL != cdtext)
track.tags = gst_cdio_get_cdtext (GST_OBJECT (src), cdtext,
i + first_track);
#else
track.tags = gst_cdio_get_cdtext (GST_OBJECT (src), src->cdio,
i + first_track);
#endif
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gst_audio_cd_src_add_track (GST_AUDIO_CD_SRC (src), &track);
}
/* Try to detect if we need to byte-order swap the samples coming from the
* drive, which might be the case if the CD drive operates in a different
* endianness than the host CPU's endianness (happens on e.g. Powerbook G4) */
gst_cdio_cdda_src_detect_drive_endianness (src, first_audio_sector,
last_audio_sector);
return TRUE;
/* ERRORS */
open_failed:
{
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ,
(_("Could not open CD device for reading.")),
("cdio_open() failed: %s", g_strerror (errno)));
return FALSE;
}
not_audio:
{
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ,
(_("Disc is not an Audio CD.")), ("discmode: %d", (gint) discmode));
cdio_destroy (src->cdio);
src->cdio = NULL;
return FALSE;
}
}
static void
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gst_cdio_cdda_src_close (GstAudioCdSrc * audiocdsrc)
{
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GstCdioCddaSrc *src = GST_CDIO_CDDA_SRC (audiocdsrc);
if (src->cdio) {
cdio_destroy (src->cdio);
src->cdio = NULL;
}
}
static void
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gst_cdio_cdda_src_init (GstCdioCddaSrc * src)
{
src->read_speed = DEFAULT_READ_SPEED; /* don't need atomic access here */
src->cdio = NULL;
}
static void
gst_cdio_cdda_src_finalize (GObject * obj)
{
GstCdioCddaSrc *src = GST_CDIO_CDDA_SRC (obj);
if (src->cdio) {
cdio_destroy (src->cdio);
src->cdio = NULL;
}
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G_OBJECT_CLASS (gst_cdio_cdda_src_parent_class)->finalize (obj);
}
static void
gst_cdio_cdda_src_class_init (GstCdioCddaSrcClass * klass)
{
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GstAudioCdSrcClass *audiocdsrc_class = GST_AUDIO_CD_SRC_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_cdio_cdda_src_set_property;
gobject_class->get_property = gst_cdio_cdda_src_get_property;
gobject_class->finalize = gst_cdio_cdda_src_finalize;
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audiocdsrc_class->open = gst_cdio_cdda_src_open;
audiocdsrc_class->close = gst_cdio_cdda_src_close;
audiocdsrc_class->read_sector = gst_cdio_cdda_src_read_sector;
#if 0
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audiocdsrc_class->probe_devices = gst_cdio_cdda_src_probe_devices;
audiocdsrc_class->get_default_device = gst_cdio_cdda_src_get_default_device;
#endif
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_READ_SPEED,
g_param_spec_int ("read-speed", "Read speed",
"Read from device at the specified speed (-1 = default)", -1, 100,
DEFAULT_READ_SPEED, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gst_element_class_set_static_metadata (element_class,
"CD audio source (CDDA)", "Source/File",
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"Read audio from CD using libcdio",
"Tim-Philipp Müller <tim centricular net>");
}
static void
gst_cdio_cdda_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstCdioCddaSrc *src = GST_CDIO_CDDA_SRC (object);
switch (prop_id) {
case PROP_READ_SPEED:{
gint speed;
speed = g_value_get_int (value);
g_atomic_int_set (&src->read_speed, speed);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_cdio_cdda_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstCdioCddaSrc *src = GST_CDIO_CDDA_SRC (object);
switch (prop_id) {
case PROP_READ_SPEED:{
gint speed;
speed = g_atomic_int_get (&src->read_speed);
g_value_set_int (value, speed);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}