--- /dev/null
+/*
+ * AU encoder and decoder
+ * Copyright (c) 2001 Fabrice Bellard.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser 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
+ */
+
+/*
+ * First version by Francois Revol revol@free.fr
+ *
+ * Reference documents:
+ * http://www.opengroup.org/public/pubs/external/auformat.html
+ * http://www.goice.co.jp/member/mo/formats/au.html
+ */
+
+#include "avformat.h"
+#include "avi.h"
+
+/* if we don't know the size in advance */
+#define AU_UNKOWN_SIZE ((uint32_t)(~0))
+
+/* The ffmpeg codecs we support, and the IDs they have in the file */
+static const CodecTag codec_au_tags[] = {
+ { CODEC_ID_PCM_MULAW, 1 },
+ { CODEC_ID_PCM_S16BE, 3 },
+ { CODEC_ID_PCM_ALAW, 27 },
+ { 0, 0 },
+};
+
+/* AUDIO_FILE header */
+static int put_au_header(ByteIOContext *pb, AVCodecContext *enc)
+{
+ if(!enc->codec_tag)
+ enc->codec_tag = codec_get_tag(codec_au_tags, enc->codec_id);
+ if(!enc->codec_tag)
+ return -1;
+ put_tag(pb, ".snd"); /* magic number */
+ put_be32(pb, 24); /* header size */
+ put_be32(pb, AU_UNKOWN_SIZE); /* data size */
+ put_be32(pb, (uint32_t)enc->codec_tag); /* codec ID */
+ put_be32(pb, enc->sample_rate);
+ put_be32(pb, (uint32_t)enc->channels);
+ return 0;
+}
+
+static int au_write_header(AVFormatContext *s)
+{
+ ByteIOContext *pb = &s->pb;
+
+ s->priv_data = NULL;
+
+ /* format header */
+ if (put_au_header(pb, &s->streams[0]->codec) < 0) {
+ return -1;
+ }
+
+ put_flush_packet(pb);
+
+ return 0;
+}
+
+static int au_write_packet(AVFormatContext *s, int stream_index_ptr,
+ const uint8_t *buf, int size, int64_t pts)
+{
+ ByteIOContext *pb = &s->pb;
+ put_buffer(pb, buf, size);
+ return 0;
+}
+
+static int au_write_trailer(AVFormatContext *s)
+{
+ ByteIOContext *pb = &s->pb;
+ offset_t file_size;
+
+ if (!url_is_streamed(&s->pb)) {
+
+ /* update file size */
+ file_size = url_ftell(pb);
+ url_fseek(pb, 8, SEEK_SET);
+ put_be32(pb, (uint32_t)(file_size - 24));
+ url_fseek(pb, file_size, SEEK_SET);
+
+ put_flush_packet(pb);
+ }
+
+ return 0;
+}
+
+static int au_probe(AVProbeData *p)
+{
+ /* check file header */
+ if (p->buf_size <= 24)
+ return 0;
+ if (p->buf[0] == '.' && p->buf[1] == 's' &&
+ p->buf[2] == 'n' && p->buf[3] == 'd')
+ return AVPROBE_SCORE_MAX;
+ else
+ return 0;
+}
+
+/* au input */
+static int au_read_header(AVFormatContext *s,
+ AVFormatParameters *ap)
+{
+ int size;
+ unsigned int tag;
+ ByteIOContext *pb = &s->pb;
+ unsigned int id, codec, channels, rate;
+ AVStream *st;
+
+ /* check ".snd" header */
+ tag = get_le32(pb);
+ if (tag != MKTAG('.', 's', 'n', 'd'))
+ return -1;
+ size = get_be32(pb); /* header size */
+ get_be32(pb); /* data size */
+
+ id = get_be32(pb);
+ rate = get_be32(pb);
+ channels = get_be32(pb);
+
+ codec = codec_get_id(codec_au_tags, id);
+
+ if (size >= 24) {
+ /* skip unused data */
+ url_fseek(pb, size - 24, SEEK_CUR);
+ }
+
+ /* now we are ready: build format streams */
+ st = av_new_stream(s, 0);
+ if (!st)
+ return -1;
+ st->codec.codec_type = CODEC_TYPE_AUDIO;
+ st->codec.codec_tag = id;
+ st->codec.codec_id = codec;
+ st->codec.channels = channels;
+ st->codec.sample_rate = rate;
+ return 0;
+}
+
+#define MAX_SIZE 4096
+
+static int au_read_packet(AVFormatContext *s,
+ AVPacket *pkt)
+{
+ int ret;
+
+ if (url_feof(&s->pb))
+ return -EIO;
+ if (av_new_packet(pkt, MAX_SIZE))
+ return -EIO;
+ pkt->stream_index = 0;
+
+ ret = get_buffer(&s->pb, pkt->data, pkt->size);
+ if (ret < 0)
+ av_free_packet(pkt);
+ /* note: we need to modify the packet size here to handle the last
+ packet */
+ pkt->size = ret;
+ return 0;
+}
+
+static int au_read_close(AVFormatContext *s)
+{
+ return 0;
+}
+
+static AVInputFormat au_iformat = {
+ "au",
+ "SUN AU Format",
+ 0,
+ au_probe,
+ au_read_header,
+ au_read_packet,
+ au_read_close,
+};
+
+static AVOutputFormat au_oformat = {
+ "au",
+ "SUN AU Format",
+ "audio/basic",
+ "au",
+ 0,
+ CODEC_ID_PCM_S16BE,
+ CODEC_ID_NONE,
+ au_write_header,
+ au_write_packet,
+ au_write_trailer,
+};
+
+int au_init(void)
+{
+ av_register_input_format(&au_iformat);
+ av_register_output_format(&au_oformat);
+ return 0;
+}
projects / synfig.git / blobdiff