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Added element to rewrite vorbiscomments embedded in flac files. It currently doesn't honour the tag merge mode setting.

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Original commit message from CVS:
Added element to rewrite vorbiscomments embedded in flac files. It currently
doesn't honour the tag merge mode setting.
Changed application/x-flac to audio/x-flac in gstflacenc.c
This commit is contained in:
Christophe Fergeau 2003-12-07 21:40:11 +00:00
parent 12e856c26d
commit 06c6f3be60
4 changed files with 438 additions and 3 deletions
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4
ext/flac/Makefile.am
View file

@ -1,9 +1,9 @@
plugin_LTLIBRARIES = libgstflac.la
libgstflac_la_SOURCES = gstflac.c gstflacenc.c gstflacdec.c
libgstflac_la_SOURCES = gstflac.c gstflacenc.c gstflacdec.c gstflactag.c
libgstflac_la_CFLAGS = $(GST_CFLAGS)
libgstflac_la_LIBADD = $(FLAC_LIBS)
libgstflac_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
noinst_HEADERS = gstflacenc.h gstflacdec.h flac_compat.h
noinst_HEADERS = gstflacenc.h gstflacdec.h flac_compat.h gstflactag.h

3
ext/flac/gstflac.c
View file

@ -23,6 +23,7 @@
#include "gstflacenc.h"
#include "gstflacdec.h"
#include "gstflactag.h"
#include "flac_compat.h"
@ -41,6 +42,8 @@ plugin_init (GstPlugin *plugin)
if (!gst_element_register (plugin, "flacdec", GST_RANK_PRIMARY, GST_TYPE_FLACDEC))
return FALSE;
if (!gst_element_register (plugin, "flactag", GST_RANK_PRIMARY, gst_flac_tag_get_type ()))
return FALSE;
return TRUE;
}

2
ext/flac/gstflacenc.c
View file

@ -182,7 +182,7 @@ flac_caps_factory (void)
return
gst_caps_new (
"flac_flac",
"application/x-flac",
"audio/x-flac",
/* gst_props_new (
"rate", GST_PROPS_INT_RANGE (11025, 48000),
"channels", GST_PROPS_INT_RANGE (1, 2),

432
ext/flac/gstflactag.c Normal file
View file

@ -0,0 +1,432 @@
/* GStreamer
* Copyright (C) 2003 Christophe Fergeau <teuf@gnome.org>
*
* gstflactag.c: plug-in for reading/modifying vorbis comments in flac files
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gsttaginterface.h>
#include <gst/tags/gsttagediting.h>
#include <string.h>
#define GST_TYPE_FLAC_TAG (gst_flac_tag_get_type())
#define GST_FLAC_TAG(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_FLAC_TAG, GstFlacTag))
#define GST_FLAC_TAG_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_FLAC_TAG, GstFlacTag))
#define GST_IS_FLAC_TAG(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_FLAC_TAG))
#define GST_IS_FLAC_TAG_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_FLAC_TAG))
typedef struct _GstFlacTag GstFlacTag;
typedef struct _GstFlacTagClass GstFlacTagClass;
static inline
gint min (gint a, gint b) {
if (a < b) {
return a;
} else {
return b;
}
}
typedef enum {
GST_FLAC_TAG_STATE_INIT,
GST_FLAC_TAG_STATE_METADATA_BLOCKS,
GST_FLAC_TAG_STATE_WRITING_METADATA_BLOCK,
GST_FLAC_TAG_STATE_SKIP_METADATA_BLOCK,
GST_FLAC_TAG_STATE_ADD_VORBIS_COMMENT,
GST_FLAC_TAG_STATE_AUDIO_DATA
} GstFlacTagState;
struct _GstFlacTag {
GstElement element;
/* pads */
GstPad * sinkpad;
GstPad * srcpad;
GstFlacTagState state;
GstBuffer * buffer;
guint metadata_bytes_remaining;
gboolean metadata_last_block;
gboolean metadata_append_vc_block;
};
struct _GstFlacTagClass {
GstElementClass parent_class;
};
/* elementfactory information */
static GstElementDetails gst_flac_tag_details = GST_ELEMENT_DETAILS (
"flac rettager",
"Tag",
"Rewrite tags in a FLAC file",
"Christope Fergeau <teuf@gnome.org>"
);
/* signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
GST_PAD_TEMPLATE_FACTORY (flac_tag_src_template_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"flac_tag_tag_src",
"audio/x-flac",
NULL
)
)
GST_PAD_TEMPLATE_FACTORY (flac_tag_sink_template_factory,
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"flac_tag_data_sink",
"audio/x-flac",
NULL
)
)
static void gst_flac_tag_base_init (gpointer g_class);
static void gst_flac_tag_class_init (GstFlacTagClass * klass);
static void gst_flac_tag_init (GstFlacTag * tag);
static void gst_flac_tag_chain (GstPad * pad,
GstData * data);
static GstElementStateReturn gst_flac_tag_change_state (GstElement * element);
static GstElementClass *parent_class = NULL;
/* static guint gst_flac_tag_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_flac_tag_get_type (void)
{
static GType flac_tag_type = 0;
if (!flac_tag_type) {
static const GTypeInfo flac_tag_info = {
sizeof (GstFlacTagClass),
gst_flac_tag_base_init,
NULL,
(GClassInitFunc) gst_flac_tag_class_init,
NULL,
NULL,
sizeof (GstFlacTag),
0,
(GInstanceInitFunc) gst_flac_tag_init,
};
static const GInterfaceInfo tag_setter_info = {
NULL,
NULL,
NULL
};
flac_tag_type = g_type_register_static(GST_TYPE_ELEMENT, "GstFlacTag", &flac_tag_info, 0);
g_type_add_interface_static (flac_tag_type, GST_TYPE_TAG_SETTER, &tag_setter_info);
}
return flac_tag_type;
}
static void
gst_flac_tag_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &gst_flac_tag_details);
gst_element_class_add_pad_template (element_class,
GST_PAD_TEMPLATE_GET (flac_tag_sink_template_factory));
gst_element_class_add_pad_template (element_class,
GST_PAD_TEMPLATE_GET (flac_tag_src_template_factory));
}
static void
gst_flac_tag_class_init (GstFlacTagClass *klass)
{
GstElementClass *gstelement_class;
GObjectClass *gobject_class;
gstelement_class = (GstElementClass*) klass;
gobject_class = (GObjectClass*) klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
gstelement_class->change_state = gst_flac_tag_change_state;
}
static void
gst_flac_tag_init (GstFlacTag *tag)
{
/* create the sink and src pads */
tag->sinkpad = gst_pad_new_from_template(
GST_PAD_TEMPLATE_GET (flac_tag_sink_template_factory), "sink");
gst_element_add_pad (GST_ELEMENT (tag), tag->sinkpad);
gst_pad_set_chain_function (tag->sinkpad, GST_DEBUG_FUNCPTR (gst_flac_tag_chain));
tag->srcpad = gst_pad_new_from_template(
GST_PAD_TEMPLATE_GET (flac_tag_src_template_factory), "src");
gst_element_add_pad (GST_ELEMENT (tag), tag->srcpad);
tag->buffer = NULL;
}
#define FLAC_MAGIC "fLaC"
#define FLAC_MAGIC_SIZE (sizeof (FLAC_MAGIC) - 1)
static void
gst_flac_tag_chain (GstPad *pad, GstData *data)
{
GstBuffer *buffer;
GstFlacTag *tag;
if (GST_IS_EVENT (data)) {
g_print ("Unhandled event\n");
return;
}
buffer = GST_BUFFER (data);
tag = GST_FLAC_TAG (gst_pad_get_parent (pad));
if (tag->buffer) {
tag->buffer = gst_buffer_merge (tag->buffer, buffer);
} else {
tag->buffer = buffer;
}
/* Initial state, we don't even know if we are dealing with a flac file */
if (tag->state == GST_FLAC_TAG_STATE_INIT) {
if (GST_BUFFER_SIZE (tag->buffer) < sizeof (FLAC_MAGIC)) {
return;
}
if (strncmp (GST_BUFFER_DATA (tag->buffer), FLAC_MAGIC, FLAC_MAGIC_SIZE) == 0) {
GstBuffer *sub;
tag->state = GST_FLAC_TAG_STATE_METADATA_BLOCKS;
sub = gst_buffer_create_sub (tag->buffer, 0, FLAC_MAGIC_SIZE);
gst_pad_push (tag->srcpad, GST_DATA (sub));
sub = gst_buffer_create_sub (tag->buffer, FLAC_MAGIC_SIZE, GST_BUFFER_SIZE (tag->buffer) - FLAC_MAGIC_SIZE);
gst_buffer_unref (tag->buffer);
/* We do a copy because we need a writable buffer, and _create_sub
* sets the buffer it uses to read-only
*/
tag->buffer = gst_buffer_copy (sub);
gst_buffer_unref (sub);
} else {
/* FIXME: does that work well with FLAC files containing ID3v2 tags ? */
gst_element_error (GST_ELEMENT (tag), "Not a flac stream\n");
}
/* We must know if we'll add a vorbiscomment block as the last metadata
* block as soon as possible: if we won't add a block by ourselves,
* we must keep the current vorbiscomment block, and don't change
* the "last block" flag when we read it
*/
tag->metadata_append_vc_block = (gst_tag_setter_get_list (GST_TAG_SETTER (tag)) != NULL);
}
/* The fLaC magic string has been skipped, try to detect the beginning
* of a metadata block
*/
if (tag->state == GST_FLAC_TAG_STATE_METADATA_BLOCKS) {
guint size;
guint type;
gboolean is_last;
g_assert (tag->metadata_bytes_remaining == 0);
g_assert (tag->metadata_last_block == FALSE);
/* The header of a flac metadata block is 4 bytes long:
* 1st bit: indicates whether this is the last metadata info block
* 7 next bits: 4 if vorbis comment block
* 24 next bits: size of the metadata to follow (big endian)
*/
if (GST_BUFFER_SIZE (tag->buffer) < 4) {
return;
}
is_last = (((GST_BUFFER_DATA (tag->buffer)[0]) & 0x80) == 0x80);
/* If we have metadata set on the element, the last metadata block
* will be the vorbis comment block which we will build ourselves
*/
if ((is_last) && (tag->metadata_append_vc_block)) {
(GST_BUFFER_DATA (tag->buffer)[0]) &= (~0x80);
}
type = (GST_BUFFER_DATA (tag->buffer)[0]) & 0x7F;
size =
((GST_BUFFER_DATA (tag->buffer)[1]) << 16)
| ((GST_BUFFER_DATA (tag->buffer)[2]) << 8)
| (GST_BUFFER_DATA (tag->buffer)[3]);
/* The 4 bytes long header isn't included in the metadata size */
tag->metadata_bytes_remaining = size + 4;
tag->metadata_last_block = is_last;
/* Metadata blocks of type 4 are vorbis comment blocks */
if ((type == 0x04) && (tag->metadata_append_vc_block)) {
tag->state = GST_FLAC_TAG_STATE_SKIP_METADATA_BLOCK;
} else {
tag->state = GST_FLAC_TAG_STATE_WRITING_METADATA_BLOCK;
}
}
/* Reads a metadata block */
if ((tag->state == GST_FLAC_TAG_STATE_WRITING_METADATA_BLOCK) ||
(tag->state == GST_FLAC_TAG_STATE_SKIP_METADATA_BLOCK)) {
guint bytes_to_push;
g_assert (tag->metadata_bytes_remaining != 0);
bytes_to_push = min (tag->metadata_bytes_remaining,
GST_BUFFER_SIZE (tag->buffer));
if (tag->state == GST_FLAC_TAG_STATE_WRITING_METADATA_BLOCK) {
GstBuffer *sub;
sub = gst_buffer_create_sub (tag->buffer, 0, bytes_to_push);
gst_pad_push (tag->srcpad, GST_DATA (sub));
}
tag->metadata_bytes_remaining -= (bytes_to_push);
if (GST_BUFFER_SIZE (tag->buffer) > bytes_to_push) {
GstBuffer *sub;
sub = gst_buffer_create_sub (tag->buffer, bytes_to_push,
GST_BUFFER_SIZE (tag->buffer) - bytes_to_push);
gst_buffer_unref (tag->buffer);
/* We do a copy because we need a writable buffer, and _create_sub
* sets the buffer it uses to read-only
*/
tag->buffer = gst_buffer_copy (sub);
gst_buffer_unref (sub);
if (tag->metadata_last_block == FALSE) {
tag->state = GST_FLAC_TAG_STATE_METADATA_BLOCKS;
} else if (tag->metadata_append_vc_block) {
tag->state = GST_FLAC_TAG_STATE_ADD_VORBIS_COMMENT;
} else {
tag->state = GST_FLAC_TAG_STATE_AUDIO_DATA;
}
} else if (tag->metadata_bytes_remaining == 0) {
tag->state = GST_FLAC_TAG_STATE_METADATA_BLOCKS;
tag->buffer = NULL;
} else {
tag->state = GST_FLAC_TAG_STATE_WRITING_METADATA_BLOCK;
tag->buffer = NULL;
}
}
/* Creates a vorbis comment block from the metadata which was set
* on the gstreamer element, and add it to the flac stream
*/
if (tag->state == GST_FLAC_TAG_STATE_ADD_VORBIS_COMMENT) {
guchar header[4];
GstBuffer *buffer;
gint size;
const GstTagList *tags;
g_assert (tag->metadata_append_vc_block);
bzero (header, sizeof (header));
header[0] = 0x84; /* 0x80 = Last metadata block,
* 0x04 = vorbiscomment block
*/
tags = gst_tag_setter_get_list (GST_TAG_SETTER (tag));
buffer = gst_tag_list_to_vorbiscomment_buffer (tags, header,
sizeof (header), NULL);
if (buffer == NULL) {
gst_element_error (GST_ELEMENT (tag), "Error filling vorbis comments\n");
return;
}
size = GST_BUFFER_SIZE (buffer) - sizeof (header);
if ((size > 0xFFFFFF) || (size < 4)) {
/* FLAC vorbis comment blocks are limited to 2^24 bytes,
* while the vorbis specs allow more than that. Shouldn't
* be a real world problem though
*/
gst_element_error (GST_ELEMENT (tag), "Vorbis comment too long\n");
return;
}
GST_BUFFER_DATA (buffer)[1] = ((size & 0xFF0000) >> 16);
GST_BUFFER_DATA (buffer)[2] = ((size & 0x00FF00) >> 8);
GST_BUFFER_DATA (buffer)[3] = (size & 0x0000FF);
gst_pad_push (tag->srcpad, GST_DATA (buffer));
tag->state = GST_FLAC_TAG_STATE_AUDIO_DATA;
}
/* The metadata blocks have been read, now we are reading audio data */
if (tag->state == GST_FLAC_TAG_STATE_AUDIO_DATA) {
gst_pad_push (tag->srcpad, GST_DATA (tag->buffer));
tag->buffer = NULL;
}
}
static GstElementStateReturn
gst_flac_tag_change_state (GstElement *element)
{
GstFlacTag *tag;
tag = GST_FLAC_TAG (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_PLAYING:
/* do something to get out of the chain function faster */
break;
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
if (tag->buffer) {
gst_buffer_unref (tag->buffer);
tag->buffer = NULL;
}
tag->state = GST_FLAC_TAG_STATE_INIT;
break;
case GST_STATE_READY_TO_NULL:
break;
}
return parent_class->change_state (element);
}