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author | Fabrice Bellard <fabrice@bellard.org> | 2002-11-25 19:07:40 +0000 |
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committer | Fabrice Bellard <fabrice@bellard.org> | 2002-11-25 19:07:40 +0000 |
commit | abac6175916c57f59ddb51ffe41bfd1d9851fe38 (patch) | |
tree | 8fc5b70a143f0f74468c353afbf043d7e104cdc0 /libavformat/au.c | |
parent | 57fc25764261abe71b6cf7571eca182f8acf5795 (diff) | |
download | ffmpeg-streaming-abac6175916c57f59ddb51ffe41bfd1d9851fe38.zip ffmpeg-streaming-abac6175916c57f59ddb51ffe41bfd1d9851fe38.tar.gz |
renamed libav to libavformat
Originally committed as revision 1276 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/au.c')
-rw-r--r-- | libavformat/au.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/libavformat/au.c b/libavformat/au.c new file mode 100644 index 0000000..8c3d62a --- /dev/null +++ b/libavformat/au.c @@ -0,0 +1,214 @@ +/* + * 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)(~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) +{ + int tag; + + tag = codec_get_tag(codec_au_tags, enc->codec_id); + if (tag == 0) + 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)tag); /* codec ID */ + put_be32(pb, enc->sample_rate); + put_be32(pb, (UINT32)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, + UINT8 *buf, int size, int force_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)(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_malloc(sizeof(AVStream)); + if (!st) + return -1; + s->nb_streams = 1; + s->streams[0] = st; + + st->id = 0; + + 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; +} |