+++ /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