From: Andre Noll <maan@systemlinux.org>
Date: Fri, 27 Dec 2013 00:22:01 +0000 (+0000)
Subject: The ogg/speex tagger.
X-Git-Tag: v0.5.6~100^2~4
X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=commitdiff_plain;h=193fb831f608ba41c0198ae30a341b2e697c014f

The ogg/speex tagger.

This commit adds support for editing meta information of ogg/speex
files. As for ogg/opus and ogg/vorbis we make use of the generic
ogg_rewrite_tags() to write out an ogg file with modified tags. Hence
this patch only adds the speex-specific part, spx_make_meta_packet(),
which creates a meta data packet for the altered tags.
---

diff --git a/spx_afh.c b/spx_afh.c
index e8353679..108cfaa4 100644
--- a/spx_afh.c
+++ b/spx_afh.c
@@ -163,6 +163,94 @@ static int spx_get_file_info(char *map, size_t numbytes, __a_unused int fd,
 	return ogg_get_file_info(map, numbytes, afhi, &spx_callback_info);
 }
 
+static size_t spx_make_meta_packet(struct taginfo *tags, char **result)
+{
+	size_t sz;
+	char *buf, *p;
+	size_t comment_len = strlen(tags->comment),
+		artist_len = strlen(tags->artist),
+		title_len = strlen(tags->title),
+		album_len = strlen(tags->album),
+		year_len = strlen(tags->year);
+	uint32_t comment_sz = comment_len,
+		artist_sz = artist_len + strlen("artist="),
+		title_sz = title_len + strlen("title="),
+		album_sz = album_len + strlen("album="),
+		year_sz = year_len + strlen("year=");
+	uint32_t num_tags;
+
+	sz = 4 /* comment length (always present) */
+		+ comment_sz
+		+ 4; /* number of tags */
+	num_tags = 0;
+	if (artist_len) {
+		num_tags++;
+		sz += 4 + artist_sz;
+	}
+	if (title_len) {
+		num_tags++;
+		sz += 4 + title_sz;
+	}
+	if (album_len) {
+		num_tags++;
+		sz += 4 + album_sz;
+	}
+	if (year_len) {
+		num_tags++;
+		sz += 4 + year_sz;
+	}
+	PARA_DEBUG_LOG("meta packet size: %zu bytes\n", sz);
+	/* terminating zero byte for the last sprintf() */
+	buf = p = para_malloc(sz + 1);
+	write_u32(p, comment_sz);
+	p += 4;
+	strcpy(p, tags->comment);
+	p += comment_sz;
+	write_u32(p, num_tags);
+	p += 4;
+	if (artist_len) {
+		write_u32(p, artist_sz);
+		p += 4;
+		sprintf(p, "artist=%s", tags->artist);
+		p += artist_sz;
+	}
+	if (title_len) {
+		write_u32(p, title_sz);
+		p += 4;
+		sprintf(p, "title=%s", tags->title);
+		p += title_sz;
+	}
+	if (album_len) {
+		write_u32(p, album_sz);
+		p += 4;
+		sprintf(p, "album=%s", tags->album);
+		p += album_sz;
+	}
+	if (year_len) {
+		write_u32(p, year_sz);
+		p += 4;
+		sprintf(p, "year=%s", tags->year);
+		p += year_sz;
+	}
+	assert(p == buf + sz);
+	*result = buf;
+	return sz;
+}
+
+static int spx_rewrite_tags(const char *map, size_t mapsize,
+		struct taginfo *tags, int output_fd,
+		__a_unused const char *filename)
+{
+	char *meta_packet;
+	size_t meta_sz;
+	int ret;
+
+	meta_sz = spx_make_meta_packet(tags, &meta_packet);
+	ret = ogg_rewrite_tags(map, mapsize, output_fd, meta_packet, meta_sz);
+	free(meta_packet);
+	return ret;
+}
+
 /**
  * The init function of the ogg/speex audio format handler.
  *
@@ -172,4 +260,5 @@ void spx_afh_init(struct audio_format_handler *afh)
 {
 	afh->get_file_info = spx_get_file_info,
 	afh->suffixes = speex_suffixes;
+	afh->rewrite_tags = spx_rewrite_tags;
 }