diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/vocdec.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/vocdec.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/vocdec.c b/contrib/ffmpeg/libavformat/vocdec.c new file mode 100644 index 000000000..85d304dff --- /dev/null +++ b/contrib/ffmpeg/libavformat/vocdec.c @@ -0,0 +1,155 @@ +/* + * Creative Voice File demuxer. + * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org> + * + * This file is part of FFmpeg. + * + * FFmpeg 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 2.1 of the License, or (at your option) any later version. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "voc.h" + + + + +static int voc_probe(AVProbeData *p) +{ + int version, check; + + if (p->buf_size < 26) + return 0; + if (memcmp(p->buf, voc_magic, sizeof(voc_magic) - 1)) + return 0; + version = p->buf[22] | (p->buf[23] << 8); + check = p->buf[24] | (p->buf[25] << 8); + if (~version + 0x1234 != check) + return 10; + + return AVPROBE_SCORE_MAX; +} + +static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap) +{ + voc_dec_context_t *voc = s->priv_data; + ByteIOContext *pb = &s->pb; + int header_size; + AVStream *st; + + url_fskip(pb, 20); + header_size = get_le16(pb) - 22; + if (header_size != 4) { + av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size); + return AVERROR_NOTSUPP; + } + url_fskip(pb, header_size); + st = av_new_stream(s, 0); + if (!st) + return AVERROR_NOMEM; + st->codec->codec_type = CODEC_TYPE_AUDIO; + + voc->remaining_size = 0; + return 0; +} + +int +voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size) +{ + voc_dec_context_t *voc = s->priv_data; + AVCodecContext *dec = st->codec; + ByteIOContext *pb = &s->pb; + voc_type_t type; + int size; + int sample_rate = 0; + int channels = 1; + + while (!voc->remaining_size) { + type = get_byte(pb); + if (type == VOC_TYPE_EOF) + return AVERROR_IO; + voc->remaining_size = get_le24(pb); + max_size -= 4; + + switch (type) { + case VOC_TYPE_VOICE_DATA: + dec->sample_rate = 1000000 / (256 - get_byte(pb)); + if (sample_rate) + dec->sample_rate = sample_rate; + dec->channels = channels; + dec->codec_id = codec_get_id(voc_codec_tags, get_byte(pb)); + dec->bits_per_sample = av_get_bits_per_sample(dec->codec_id); + voc->remaining_size -= 2; + max_size -= 2; + channels = 1; + break; + + case VOC_TYPE_VOICE_DATA_CONT: + break; + + case VOC_TYPE_EXTENDED: + sample_rate = get_le16(pb); + get_byte(pb); + channels = get_byte(pb) + 1; + sample_rate = 256000000 / (channels * (65536 - sample_rate)); + voc->remaining_size = 0; + max_size -= 4; + break; + + case VOC_TYPE_NEW_VOICE_DATA: + dec->sample_rate = get_le32(pb); + dec->bits_per_sample = get_byte(pb); + dec->channels = get_byte(pb); + dec->codec_id = codec_get_id(voc_codec_tags, get_le16(pb)); + url_fskip(pb, 4); + voc->remaining_size -= 12; + max_size -= 12; + break; + + default: + url_fskip(pb, voc->remaining_size); + max_size -= voc->remaining_size; + voc->remaining_size = 0; + break; + } + } + + dec->bit_rate = dec->sample_rate * dec->bits_per_sample; + + if (max_size <= 0) + max_size = 2048; + size = FFMIN(voc->remaining_size, max_size); + voc->remaining_size -= size; + return av_get_packet(pb, pkt, size); +} + +static int voc_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + return voc_get_packet(s, pkt, s->streams[0], 0); +} + +static int voc_read_close(AVFormatContext *s) +{ + return 0; +} + +AVInputFormat voc_demuxer = { + "voc", + "Creative Voice File format", + sizeof(voc_dec_context_t), + voc_probe, + voc_read_header, + voc_read_packet, + voc_read_close, + .codec_tag=(const AVCodecTag*[]){voc_codec_tags, 0}, +}; |