added library for parsing icy-metadata
The icy_metadata will be used by the curl input_stream implementation.
This commit is contained in:
Max Kellermann
parent
700bd44fda
commit
f9e9089f42
@ -37,6 +37,7 @@ mpd_headers = \
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input_stream.h \
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input_file.h \
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input_curl.h \
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icy_metadata.h \
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client.h \
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dlist.h \
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listen.h \
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@ -264,7 +265,7 @@ endif
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if HAVE_CURL
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mpd_SOURCES += input_curl.c
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mpd_SOURCES += input_curl.c icy_metadata.c
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endif
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175
src/icy_metadata.c
Normal file
175
src/icy_metadata.c
Normal file
@ -0,0 +1,175 @@
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/*
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* Copyright (C) 2003-2008 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "icy_metadata.h"
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#include "tag.h"
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#include <glib.h>
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#include <assert.h>
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#include <string.h>
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void
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icy_deinit(struct icy_metadata *im)
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{
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if (!icy_defined(im))
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return;
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if (im->data_rest == 0 && im->meta_size > 0)
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g_free(im->meta_data);
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if (im->tag != NULL)
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tag_free(im->tag);
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}
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void
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icy_reset(struct icy_metadata *im)
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{
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if (!icy_defined(im))
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return;
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icy_deinit(im);
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im->data_rest = im->data_size;
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im->meta_size = 0;
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}
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size_t
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icy_data(struct icy_metadata *im, size_t length)
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{
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assert(icy_defined(im));
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assert(length > 0);
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if (im->data_rest == 0)
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return 0;
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if (length >= im->data_rest) {
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length = im->data_rest;
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im->data_rest = 0;
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} else
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im->data_rest -= length;
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return length;
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}
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static void
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icy_add_item(struct tag *tag, enum tag_type type, const char *value)
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{
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size_t length = strlen(value);
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if (length >= 2 && value[0] == '\'' && value[length - 1] == '\'') {
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/* strip the single quotes */
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++value;
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length -= 2;
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}
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if (length > 0)
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tag_add_item_n(tag, type, value, length);
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}
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static void
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icy_parse_tag_item(struct tag *tag, const char *item)
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{
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gchar **p = g_strsplit(item, "=", 0);
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if (p[0] != NULL && p[1] != NULL) {
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if (strcmp(p[0], "StreamTitle") == 0)
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icy_add_item(tag, TAG_ITEM_TITLE, p[1]);
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else
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g_debug("unknown icy-tag: '%s'", p[0]);
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}
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g_strfreev(p);
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}
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static struct tag *
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icy_parse_tag(const char *p)
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{
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struct tag *tag = tag_new();
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gchar **items = g_strsplit(p, ";", 0);
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for (unsigned i = 0; items[i] != NULL; ++i)
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icy_parse_tag_item(tag, items[i]);
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g_strfreev(items);
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return tag;
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}
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size_t
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icy_meta(struct icy_metadata *im, const void *data, size_t length)
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{
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const unsigned char *p = data;
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assert(icy_defined(im));
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assert(im->data_rest == 0);
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assert(length > 0);
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if (im->meta_size == 0) {
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/* read meta_size from the first byte of a meta
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block */
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im->meta_size = *p++ * 16;
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if (im->meta_size == 0) {
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/* special case: no metadata */
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im->data_rest = im->data_size;
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return 1;
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}
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/* 1 byte was consumed (must be re-added later for the
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return value */
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--length;
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/* initialize metadata reader, allocate enough
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memory (+1 for the null terminator) */
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im->meta_position = 0;
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im->meta_data = g_malloc(im->meta_size + 1);
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}
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assert(im->meta_position < im->meta_size);
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if (length > im->meta_size - im->meta_position)
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length = im->meta_size - im->meta_position;
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memcpy(im->meta_data + im->meta_position, data, length);
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im->meta_position += length;
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if (p != data)
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/* re-add the first byte (which contained meta_size) */
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++length;
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if (im->meta_position == im->meta_size) {
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/* null-terminate the string */
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im->meta_data[im->meta_size] = 0;
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/* parse */
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if (im->tag != NULL)
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tag_free(im->tag);
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im->tag = icy_parse_tag(im->meta_data);
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g_free(im->meta_data);
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/* change back to normal data mode */
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im->meta_size = 0;
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im->data_rest = im->data_size;
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}
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return length;
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}
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98
src/icy_metadata.h
Normal file
98
src/icy_metadata.h
Normal file
@ -0,0 +1,98 @@
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/*
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* Copyright (C) 2003-2008 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef ICY_METADATA_H
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#define ICY_METADATA_H
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#include <stdbool.h>
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#include <stddef.h>
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struct icy_metadata {
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size_t data_size, data_rest;
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size_t meta_size, meta_position;
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char *meta_data;
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struct tag *tag;
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};
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/**
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* Initialize a disabled icy_metadata object.
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*/
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static inline void
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icy_clear(struct icy_metadata *im)
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{
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im->data_size = 0;
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}
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/**
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* Initialize an enabled icy_metadata object with the specified
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* data_size (from the icy-metaint HTTP response header).
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*/
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static inline void
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icy_start(struct icy_metadata *im, size_t data_size)
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{
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im->data_size = im->data_rest = data_size;
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im->meta_size = 0;
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im->tag = NULL;
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}
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/**
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* Resets the icy_metadata. Call this after rewinding the stream.
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*/
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void
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icy_reset(struct icy_metadata *im);
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void
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icy_deinit(struct icy_metadata *im);
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/**
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* Checks whether the icy_metadata object is enabled.
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*/
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static inline bool
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icy_defined(const struct icy_metadata *im)
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{
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return im->data_size > 0;
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}
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/**
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* Evaluates data. Returns the number of bytes of normal data which
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* can be read by the caller, but not more than "length". If the
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* return value is smaller than "length", the caller should invoke
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* icy_meta().
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*/
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size_t
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icy_data(struct icy_metadata *im, size_t length);
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/**
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* Reads metadata from the stream. Returns the number of bytes
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* consumed. If the return value is smaller than "length", the caller
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* should invoke icy_data().
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*/
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size_t
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icy_meta(struct icy_metadata *im, const void *data, size_t length);
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static inline struct tag *
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icy_tag(struct icy_metadata *im)
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{
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struct tag *tag = im->tag;
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im->tag = NULL;
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return tag;
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}
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#endif
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