/*
- * Copyright (C) 2004-2011 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2004 Andre Noll <maan@tuebingen.mpg.de>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
vorbis_comment vc;
};
+/*
+ * Vorbis uses three header packets, all of which are required: the
+ * identification header, the comments header, and the setup header.
+ *
+ * The identification header identifies the bitstream as Vorbis. It contains
+ * the Vorbis version and simple audio characteristics of the stream such as
+ * sample rate and number of channels.
+ *
+ * The comment header includes user text comments (tags) and a vendor string
+ * for the application/library that produced the bitstream.
+ *
+ * The setup header includes extensive CODEC setup information as well as the
+ * complete VQ and Huffman codebooks needed for decoding.
+ */
static int vorbis_packet_callback(ogg_packet *packet, int packet_num,
__a_unused int serial, struct afh_info *afhi, void *private_data)
{
og->header_len, og->body_len, old_len, new_len);
}
-/*
- * Process the first three ogg packets.
- *
- * This creates chunk zero (the audio file header) from the first three ogg
- * packets of the input file with metadata (vorbis comments) stripped off. Page
- * 0 of the input file always contains only ogg packet #0 while page 1 usually
- * contains both packets 1 (comments) and 2 (setup). However, we always create
- * an separate ogg page for each packet to circumvent a bug in older libogg
- * versions which causes too little data being copied to the second ogg page.
- * This affects at least Ubuntu Hardy, and there is no real disadvantage in
- * creating three pages instead of two.
- */
static int vorbis_get_header_callback(ogg_packet *packet, int packet_num,
int serial, __a_unused struct afh_info *afhi, void *private_data)
{
0xff /* framing bit */
};
- PARA_DEBUG_LOG("processing ogg packet #%d (%li bytes)\n",
- packet_num, packet->bytes);
+ PARA_DEBUG_LOG("processing ogg packet #%d\n", packet_num);
if (packet_num > 2)
return 0;
if (packet_num == 0) {
ogg_stream_init(&vghd->os, serial);
- ret = -E_OGG_PACKET_IN;
ret = ogg_stream_packetin(&vghd->os, packet);
if (ret < 0)
goto out;
return 1;
}
if (packet_num == 1) {
- PARA_INFO_LOG("replacing metadata packet (saved %ld bytes)\n",
- packet->bytes - sizeof(dummy_packet));
ogg_packet replacement = *packet;
+ PARA_INFO_LOG("replacing metadata packet\n");
replacement.packet = dummy_packet;
replacement.bytes = sizeof(dummy_packet);
+ ret = ogg_stream_packetin(&vghd->os, &replacement);
+ if (ret >= 0)
+ return 1;
ret = -E_OGG_PACKET_IN;
- if (ogg_stream_packetin(&vghd->os, &replacement) < 0)
- goto out;
- ret = -E_OGG_STREAM_FLUSH;
- if (ogg_stream_flush(&vghd->os, &og) == 0)
- goto out;
- add_ogg_page(&og, vghd);
- return 1;
+ goto out;
}
ret = -E_OGG_PACKET_IN;
if (ogg_stream_packetin(&vghd->os, packet) < 0)
goto out;
- ret = -E_OGG_STREAM_FLUSH;
- if (ogg_stream_flush(&vghd->os, &og) == 0)
- goto out;
- add_ogg_page(&og, vghd);
+ while (ogg_stream_flush(&vghd->os, &og))
+ add_ogg_page(&og, vghd);
ret = 0;
out:
ogg_stream_clear(&vghd->os);
goto fail;
*buf = vghd.buf;
*len = vghd.len;
- PARA_INFO_LOG("created %zu byte ogg/vorbis header chunk\n", *len);
+ PARA_INFO_LOG("created %zu byte ogg vorbis header\n", *len);
return;
fail:
PARA_ERROR_LOG("%s\n", para_strerror(-ret));