yading@11: /*
yading@11:  * Raw TAK demuxer
yading@11:  * Copyright (c) 2012 Paul B Mahol
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavcodec/tak.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "rawdec.h"
yading@11: #include "apetag.h"
yading@11: 
yading@11: typedef struct TAKDemuxContext {
yading@11:     int     mlast_frame;
yading@11:     int64_t data_end;
yading@11: } TAKDemuxContext;
yading@11: 
yading@11: static int tak_probe(AVProbeData *p)
yading@11: {
yading@11:     if (!memcmp(p->buf, "tBaK", 4))
yading@11:         return AVPROBE_SCORE_MAX / 2;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int tak_read_header(AVFormatContext *s)
yading@11: {
yading@11:     TAKDemuxContext *tc = s->priv_data;
yading@11:     AVIOContext *pb     = s->pb;
yading@11:     GetBitContext gb;
yading@11:     AVStream *st;
yading@11:     uint8_t *buffer = NULL;
yading@11:     int ret;
yading@11: 
yading@11:     st = avformat_new_stream(s, 0);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:     st->codec->codec_id   = AV_CODEC_ID_TAK;
yading@11:     st->need_parsing      = AVSTREAM_PARSE_FULL_RAW;
yading@11: 
yading@11:     tc->mlast_frame = 0;
yading@11:     if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) {
yading@11:         avio_seek(pb, -4, SEEK_CUR);
yading@11:         return 0;
yading@11:     }
yading@11: 
yading@11:     while (!url_feof(pb)) {
yading@11:         enum TAKMetaDataType type;
yading@11:         int size;
yading@11: 
yading@11:         type = avio_r8(pb) & 0x7f;
yading@11:         size = avio_rl24(pb);
yading@11: 
yading@11:         switch (type) {
yading@11:         case TAK_METADATA_STREAMINFO:
yading@11:         case TAK_METADATA_LAST_FRAME:
yading@11:         case TAK_METADATA_ENCODER:
yading@11:             buffer = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:             if (!buffer)
yading@11:                 return AVERROR(ENOMEM);
yading@11: 
yading@11:             if (avio_read(pb, buffer, size) != size) {
yading@11:                 av_freep(&buffer);
yading@11:                 return AVERROR(EIO);
yading@11:             }
yading@11: 
yading@11:             init_get_bits(&gb, buffer, size * 8);
yading@11:             break;
yading@11:         case TAK_METADATA_MD5: {
yading@11:             uint8_t md5[16];
yading@11:             int i;
yading@11: 
yading@11:             if (size != 19)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             avio_read(pb, md5, 16);
yading@11:             avio_skip(pb, 3);
yading@11:             av_log(s, AV_LOG_VERBOSE, "MD5=");
yading@11:             for (i = 0; i < 16; i++)
yading@11:                 av_log(s, AV_LOG_VERBOSE, "%02x", md5[i]);
yading@11:             av_log(s, AV_LOG_VERBOSE, "\n");
yading@11:             break;
yading@11:         }
yading@11:         case TAK_METADATA_END: {
yading@11:             int64_t curpos = avio_tell(pb);
yading@11: 
yading@11:             if (pb->seekable) {
yading@11:                 ff_ape_parse_tag(s);
yading@11:                 avio_seek(pb, curpos, SEEK_SET);
yading@11:             }
yading@11: 
yading@11:             tc->data_end += curpos;
yading@11:             return 0;
yading@11:         }
yading@11:         default:
yading@11:             ret = avio_skip(pb, size);
yading@11:             if (ret < 0)
yading@11:                 return ret;
yading@11:         }
yading@11: 
yading@11:         if (type == TAK_METADATA_STREAMINFO) {
yading@11:             TAKStreamInfo ti;
yading@11: 
yading@11:             avpriv_tak_parse_streaminfo(&gb, &ti);
yading@11:             if (ti.samples > 0)
yading@11:                 st->duration = ti.samples;
yading@11:             st->codec->bits_per_coded_sample = ti.bps;
yading@11:             if (ti.ch_layout)
yading@11:                 st->codec->channel_layout = ti.ch_layout;
yading@11:             st->codec->sample_rate           = ti.sample_rate;
yading@11:             st->codec->channels              = ti.channels;
yading@11:             st->start_time                   = 0;
yading@11:             avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
yading@11:             st->codec->extradata             = buffer;
yading@11:             st->codec->extradata_size        = size;
yading@11:             buffer                           = NULL;
yading@11:         } else if (type == TAK_METADATA_LAST_FRAME) {
yading@11:             if (size != 11)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             tc->mlast_frame = 1;
yading@11:             tc->data_end    = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) +
yading@11:                               get_bits(&gb, TAK_LAST_FRAME_SIZE_BITS);
yading@11:             av_freep(&buffer);
yading@11:         } else if (type == TAK_METADATA_ENCODER) {
yading@11:             av_log(s, AV_LOG_VERBOSE, "encoder version: %0X\n",
yading@11:                    get_bits_long(&gb, TAK_ENCODER_VERSION_BITS));
yading@11:             av_freep(&buffer);
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     return AVERROR_EOF;
yading@11: }
yading@11: 
yading@11: static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     TAKDemuxContext *tc = s->priv_data;
yading@11:     int ret;
yading@11: 
yading@11:     if (tc->mlast_frame) {
yading@11:         AVIOContext *pb = s->pb;
yading@11:         int64_t size, left;
yading@11: 
yading@11:         left = tc->data_end - avio_tell(s->pb);
yading@11:         size = FFMIN(left, 1024);
yading@11:         if (size <= 0)
yading@11:             return AVERROR_EOF;
yading@11: 
yading@11:         ret = av_get_packet(pb, pkt, size);
yading@11:         if (ret < 0)
yading@11:             return ret;
yading@11: 
yading@11:         pkt->stream_index = 0;
yading@11:     } else {
yading@11:         ret = ff_raw_read_partial_packet(s, pkt);
yading@11:     }
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_tak_demuxer = {
yading@11:     .name           = "tak",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("raw TAK"),
yading@11:     .priv_data_size = sizeof(TAKDemuxContext),
yading@11:     .read_probe     = tak_probe,
yading@11:     .read_header    = tak_read_header,
yading@11:     .read_packet    = raw_read_packet,
yading@11:     .flags          = AVFMT_GENERIC_INDEX,
yading@11:     .extensions     = "tak",
yading@11:     .raw_codec_id   = AV_CODEC_ID_TAK,
yading@11: };