diff options
Diffstat (limited to 'libavformat/3dostr.c')
| -rw-r--r-- | libavformat/3dostr.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/libavformat/3dostr.c b/libavformat/3dostr.c new file mode 100644 index 0000000000..5325a03f90 --- /dev/null +++ b/libavformat/3dostr.c @@ -0,0 +1,168 @@ +/* + * 3DO STR demuxer + * Copyright (c) 2015 Paul B Mahol + * + * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "avformat.h" +#include "internal.h" + +static int threedostr_probe(AVProbeData *p) +{ + if (memcmp(p->buf, "CTRL", 4) && + memcmp(p->buf, "SHDR", 4) && + memcmp(p->buf, "SNDS", 4)) + return 0; + + return AVPROBE_SCORE_MAX / 3 * 2; +} + +static int threedostr_read_header(AVFormatContext *s) +{ + unsigned chunk, codec = 0, size, ctrl_size = -1, found_shdr = 0; + AVStream *st; + + while (!avio_feof(s->pb) && !found_shdr) { + chunk = avio_rl32(s->pb); + size = avio_rb32(s->pb); + + if (size < 8) + return AVERROR_INVALIDDATA; + size -= 8; + + switch (chunk) { + case MKTAG('C','T','R','L'): + ctrl_size = size; + break; + case MKTAG('S','N','D','S'): + if (size < 56) + return AVERROR_INVALIDDATA; + avio_skip(s->pb, 8); + if (avio_rl32(s->pb) != MKTAG('S','H','D','R')) + return AVERROR_INVALIDDATA; + avio_skip(s->pb, 24); + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->sample_rate = avio_rb32(s->pb); + st->codec->channels = avio_rb32(s->pb); + if (st->codec->channels <= 0) + return AVERROR_INVALIDDATA; + codec = avio_rl32(s->pb); + avio_skip(s->pb, 4); + if (ctrl_size == 20 || ctrl_size == 3 || ctrl_size == -1) + st->duration = (avio_rb32(s->pb) - 1) / st->codec->channels; + else + st->duration = avio_rb32(s->pb) * 16 / st->codec->channels; + size -= 56; + found_shdr = 1; + break; + case MKTAG('S','H','D','R'): + if (size > 0x78) { + avio_skip(s->pb, 0x74); + size -= 0x78; + if (avio_rl32(s->pb) == MKTAG('C','T','R','L') && size > 4) { + ctrl_size = avio_rb32(s->pb); + size -= 4; + } + } + break; + default: + av_log(s, AV_LOG_DEBUG, "skipping unknown chunk: %X\n", chunk); + break; + } + + avio_skip(s->pb, size); + } + + switch (codec) { + case MKTAG('S','D','X','2'): + st->codec->codec_id = AV_CODEC_ID_SDX2_DPCM; + st->codec->block_align = 1 * st->codec->channels; + break; + default: + avpriv_request_sample(s, "codec %X", codec); + return AVERROR_PATCHWELCOME; + } + + avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); + + return 0; +} + +static int threedostr_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + unsigned chunk, size, found_ssmp = 0; + AVStream *st = s->streams[0]; + int64_t pos; + int ret = 0; + + while (!found_ssmp) { + if (avio_feof(s->pb)) + return AVERROR_EOF; + + pos = avio_tell(s->pb); + chunk = avio_rl32(s->pb); + size = avio_rb32(s->pb); + + if (!size) + continue; + + if (size < 8) + return AVERROR_INVALIDDATA; + size -= 8; + + switch (chunk) { + case MKTAG('S','N','D','S'): + if (size <= 16) + return AVERROR_INVALIDDATA; + avio_skip(s->pb, 8); + if (avio_rl32(s->pb) != MKTAG('S','S','M','P')) + return AVERROR_INVALIDDATA; + avio_skip(s->pb, 4); + size -= 16; + ret = av_get_packet(s->pb, pkt, size); + pkt->pos = pos; + pkt->stream_index = 0; + pkt->duration = size / st->codec->channels; + size = 0; + found_ssmp = 1; + break; + default: + av_log(s, AV_LOG_DEBUG, "skipping unknown chunk: %X\n", chunk); + break; + } + + avio_skip(s->pb, size); + } + + return ret; +} + +AVInputFormat ff_threedostr_demuxer = { + .name = "3dostr", + .long_name = NULL_IF_CONFIG_SMALL("3DO STR"), + .read_probe = threedostr_probe, + .read_header = threedostr_read_header, + .read_packet = threedostr_read_packet, + .extensions = "str", + .flags = AVFMT_GENERIC_INDEX, +}; |