126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
/* Icecast
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*
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* This program is distributed under the GNU General Public License, version 2.
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* A copy of this license is included with this source.
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*
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* Copyright 2000-2004, Jack Moffitt <jack@xiph.org,
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* Michael Smith <msmith@xiph.org>,
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* oddsock <oddsock@xiph.org>,
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* Karl Heyes <karl@xiph.org>
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* and others (see AUTHORS for details).
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* Copyright 2014-2018, Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>,
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*/
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/* Ogg codec handler for FLAC logical streams */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include <ogg/ogg.h>
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#include <string.h>
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#include "refbuf.h"
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#include "format_ogg.h"
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#include "client.h"
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#include "stats.h"
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#define CATMODULE "format-flac"
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#include "logging.h"
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static void flac_codec_free (ogg_state_t *ogg_info, ogg_codec_t *codec)
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{
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ICECAST_LOG_DEBUG("freeing FLAC codec");
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stats_event (ogg_info->mount, "FLAC_version", NULL);
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ogg_stream_clear (&codec->os);
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free (codec);
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}
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/* Here, we just verify the page is ok and then add it to the queue */
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static refbuf_t *process_flac_page (ogg_state_t *ogg_info, ogg_codec_t *codec, ogg_page *page, format_plugin_t *plugin)
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{
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refbuf_t * refbuf;
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if (codec->headers)
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{
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ogg_packet packet;
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if (ogg_stream_pagein (&codec->os, page) < 0)
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{
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ogg_info->error = 1;
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return NULL;
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}
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while (ogg_stream_packetout (&codec->os, &packet))
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{
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int type = packet.packet[0];
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if (type == 0xFF)
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{
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codec->headers = 0;
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break;
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}
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if (type >= 1 && type <= 0x7E)
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continue;
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if (type >= 0x81 && type <= 0xFE)
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continue;
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ogg_info->error = 1;
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return NULL;
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}
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if (codec->headers)
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{
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format_ogg_attach_header (ogg_info, page);
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return NULL;
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}
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}
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refbuf = make_refbuf_with_page (page);
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return refbuf;
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}
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/* Check for flac header in logical stream */
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ogg_codec_t *initial_flac_page (format_plugin_t *plugin, ogg_page *page)
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{
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ogg_state_t *ogg_info = plugin->_state;
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ogg_codec_t *codec = calloc (1, sizeof (ogg_codec_t));
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ogg_packet packet;
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ogg_stream_init (&codec->os, ogg_page_serialno (page));
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ogg_stream_pagein (&codec->os, page);
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ogg_stream_packetout (&codec->os, &packet);
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ICECAST_LOG_DEBUG("checking for FLAC codec");
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do
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{
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unsigned char *parse = packet.packet;
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if (page->header_len + page->body_len != 79)
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break;
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if (*parse != 0x7F)
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break;
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parse++;
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if (memcmp(parse, "FLAC", 4) != 0)
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break;
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ICECAST_LOG_INFO("seen initial FLAC header");
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parse += 4;
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stats_event_args (ogg_info->mount, "FLAC_version", "%d.%d", parse[0], parse[1]);
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codec->process_page = process_flac_page;
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codec->codec_free = flac_codec_free;
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codec->headers = 1;
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codec->name = "FLAC";
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format_ogg_attach_header(ogg_info, page);
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return codec;
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} while (0);
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ogg_stream_clear(&codec->os);
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free(codec);
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return NULL;
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}
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