diff options
Diffstat (limited to 'ffmpeg/libavformat/astdec.c')
| -rw-r--r-- | ffmpeg/libavformat/astdec.c | 122 |
1 files changed, 0 insertions, 122 deletions
diff --git a/ffmpeg/libavformat/astdec.c b/ffmpeg/libavformat/astdec.c deleted file mode 100644 index 3fa26dc..0000000 --- a/ffmpeg/libavformat/astdec.c +++ /dev/null @@ -1,122 +0,0 @@ -/* - * AST demuxer - * Copyright (c) 2012 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 "libavutil/channel_layout.h" -#include "libavutil/intreadwrite.h" -#include "avformat.h" -#include "internal.h" -#include "ast.h" - -static int ast_probe(AVProbeData *p) -{ - if (AV_RL32(p->buf) != MKTAG('S','T','R','M')) - return 0; - - if (!AV_RB16(p->buf + 10) || - !AV_RB16(p->buf + 12) || AV_RB16(p->buf + 12) > 256 || - !AV_RB32(p->buf + 16) || AV_RB32(p->buf + 16) > 8*48000) - return AVPROBE_SCORE_MAX / 8; - - return AVPROBE_SCORE_MAX / 3 * 2; -} - -static int ast_read_header(AVFormatContext *s) -{ - int depth; - AVStream *st; - - st = avformat_new_stream(s, NULL); - if (!st) - return AVERROR(ENOMEM); - - avio_skip(s->pb, 8); - st->codec->codec_type = AVMEDIA_TYPE_AUDIO; - st->codec->codec_id = ff_codec_get_id(ff_codec_ast_tags, avio_rb16(s->pb)); - - depth = avio_rb16(s->pb); - if (depth != 16) { - avpriv_request_sample(s, "depth %d", depth); - return AVERROR_INVALIDDATA; - } - - st->codec->channels = avio_rb16(s->pb); - if (!st->codec->channels) - return AVERROR_INVALIDDATA; - - if (st->codec->channels == 2) - st->codec->channel_layout = AV_CH_LAYOUT_STEREO; - else if (st->codec->channels == 4) - st->codec->channel_layout = AV_CH_LAYOUT_4POINT0; - - avio_skip(s->pb, 2); - st->codec->sample_rate = avio_rb32(s->pb); - if (st->codec->sample_rate <= 0) - return AVERROR_INVALIDDATA; - st->start_time = 0; - st->duration = avio_rb32(s->pb); - avio_skip(s->pb, 40); - avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); - - return 0; -} - -static int ast_read_packet(AVFormatContext *s, AVPacket *pkt) -{ - uint32_t type, size; - int64_t pos; - int ret; - - if (url_feof(s->pb)) - return AVERROR_EOF; - - pos = avio_tell(s->pb); - type = avio_rl32(s->pb); - size = avio_rb32(s->pb); - if (size > INT_MAX / s->streams[0]->codec->channels) - return AVERROR_INVALIDDATA; - - size *= s->streams[0]->codec->channels; - if ((ret = avio_skip(s->pb, 24)) < 0) // padding - return ret; - - if (type == MKTAG('B','L','C','K')) { - ret = av_get_packet(s->pb, pkt, size); - pkt->stream_index = 0; - pkt->pos = pos; - } else { - av_log(s, AV_LOG_ERROR, "unknown chunk %x\n", type); - avio_skip(s->pb, size); - ret = AVERROR_INVALIDDATA; - } - - return ret; -} - -AVInputFormat ff_ast_demuxer = { - .name = "ast", - .long_name = NULL_IF_CONFIG_SMALL("AST (Audio Stream)"), - .read_probe = ast_probe, - .read_header = ast_read_header, - .read_packet = ast_read_packet, - .extensions = "ast", - .flags = AVFMT_GENERIC_INDEX, - .codec_tag = (const AVCodecTag* const []){ff_codec_ast_tags, 0}, -}; |