diff options
author | Paul B Mahol <onemda@gmail.com> | 2012-10-02 17:43:19 +0400 |
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committer | Paul B Mahol <onemda@gmail.com> | 2012-10-08 13:06:25 +0400 |
commit | d7a473926504e2acfa6ae3bead0938e1f4e03441 (patch) | |
tree | f4eae034819efb112671ec93273fc1653b64b9eb /libavformat/takdec.c | |
parent | 208a5d13228208caea10d96353693c39d08a1211 (diff) |
TAK demuxer, decoder and parser
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Diffstat (limited to 'libavformat/takdec.c')
-rw-r--r-- | libavformat/takdec.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/libavformat/takdec.c b/libavformat/takdec.c new file mode 100644 index 0000000000..6fd3d93cbd --- /dev/null +++ b/libavformat/takdec.c @@ -0,0 +1,184 @@ +/* + * Raw TAK 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 "libavcodec/tak.h" +#include "avformat.h" +#include "internal.h" +#include "rawdec.h" +#include "apetag.h" + +typedef struct TAKDemuxContext { + int mlast_frame; + int64_t left; +} TAKDemuxContext; + +static int tak_probe(AVProbeData *p) +{ + if (!memcmp(p->buf, "tBaK", 4)) + return AVPROBE_SCORE_MAX / 2; + return 0; +} + +static int tak_read_header(AVFormatContext *s) +{ + TAKDemuxContext *tc = s->priv_data; + AVIOContext *pb = s->pb; + GetBitContext gb; + AVStream *st; + uint8_t *buffer = NULL; + int ret; + + st = avformat_new_stream(s, 0); + if (!st) + return AVERROR(ENOMEM); + + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->codec_id = AV_CODEC_ID_TAK; + st->need_parsing = AVSTREAM_PARSE_FULL_RAW; + + tc->mlast_frame = 0; + if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) { + avio_seek(pb, -4, SEEK_CUR); + return 0; + } + + while (!url_feof(pb)) { + enum TAKMetaDataType type; + int size; + + type = avio_r8(pb) & 0x7f; + size = avio_rl24(pb); + + switch (type) { + case TAK_METADATA_STREAMINFO: + case TAK_METADATA_LAST_FRAME: + case TAK_METADATA_ENCODER: + buffer = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); + if (!buffer) + return AVERROR(ENOMEM); + + if (avio_read(pb, buffer, size) != size) { + av_freep(&buffer); + return AVERROR(EIO); + } + + init_get_bits(&gb, buffer, size * 8); + break; + case TAK_METADATA_MD5: { + uint8_t md5[16]; + int i; + + if (size != 19) + return AVERROR_INVALIDDATA; + avio_read(pb, md5, 16); + avio_skip(pb, 3); + av_log(s, AV_LOG_VERBOSE, "MD5="); + for (i = 0; i < 16; i++) + av_log(s, AV_LOG_VERBOSE, "%02x", md5[i]); + av_log(s, AV_LOG_VERBOSE, "\n"); + break; + } + case TAK_METADATA_END: + if (pb->seekable) { + int64_t curpos = avio_tell(pb); + + ff_ape_parse_tag(s); + avio_seek(pb, curpos, SEEK_SET); + } + return 0; + break; + default: + ret = avio_skip(pb, size); + if (ret < 0) + return ret; + } + + if (type == TAK_METADATA_STREAMINFO) { + TAKStreamInfo ti; + + avpriv_tak_parse_streaminfo(&gb, &ti); + if (ti.samples > 0) + st->duration = ti.samples; + st->codec->bits_per_coded_sample = ti.bps; + if (ti.ch_layout) + st->codec->channel_layout = ti.ch_layout; + st->codec->sample_rate = ti.sample_rate; + st->codec->channels = ti.channels; + st->start_time = 0; + avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); + st->codec->extradata = buffer; + st->codec->extradata_size = size; + buffer = NULL; + } else if (type == TAK_METADATA_LAST_FRAME) { + if (size != 11) + return AVERROR_INVALIDDATA; + tc->mlast_frame = 1; + tc->left = get_bits_longlong(&gb, TAK_LAST_FRAME_POS_BITS) + + get_bits(&gb, TAK_LAST_FRAME_SIZE_BITS); + av_freep(&buffer); + } else if (type == TAK_METADATA_ENCODER) { + av_log(s, AV_LOG_VERBOSE, "encoder version: %0X\n", + get_bits_long(&gb, TAK_ENCODER_VERSION_BITS)); + av_freep(&buffer); + } + } + + return AVERROR_EOF; +} + +static int raw_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + TAKDemuxContext *tc = s->priv_data; + int ret; + + if (tc->mlast_frame) { + AVIOContext *pb = s->pb; + int64_t size; + + size = FFMIN(tc->left, 1024); + if (!size) + return AVERROR_EOF; + + ret = av_get_packet(pb, pkt, size); + if (ret < 0) + return ret; + + pkt->stream_index = 0; + pkt->pos = avio_tell(pb); + tc->left -= ret; + } else { + ret = ff_raw_read_partial_packet(s, pkt); + } + + return ret; +} + +AVInputFormat ff_tak_demuxer = { + .name = "tak", + .long_name = NULL_IF_CONFIG_SMALL("raw TAK"), + .priv_data_size = sizeof(TAKDemuxContext), + .read_probe = tak_probe, + .read_header = tak_read_header, + .read_packet = raw_read_packet, + .flags = AVFMT_GENERIC_INDEX, + .extensions = "tak", + .raw_codec_id = AV_CODEC_ID_TAK, +}; |