229 lines
6.9 KiB
C
Executable File
229 lines
6.9 KiB
C
Executable File
/*
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* Raw TAK demuxer
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/crc.h"
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#define BITSTREAM_READER_LE
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#include "libavcodec/tak.h"
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#include "apetag.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "internal.h"
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#include "rawdec.h"
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typedef struct TAKDemuxContext {
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AVClass *class;
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int raw_packet_size;
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int mlast_frame;
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int64_t data_end;
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} TAKDemuxContext;
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static int tak_probe(const AVProbeData *p)
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{
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if (!memcmp(p->buf, "tBaK", 4))
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return AVPROBE_SCORE_EXTENSION;
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return 0;
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}
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static unsigned long tak_check_crc(unsigned long checksum, const uint8_t *buf,
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unsigned int len)
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{
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return av_crc(av_crc_get_table(AV_CRC_24_IEEE), checksum, buf, len);
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}
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static int tak_read_header(AVFormatContext *s)
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{
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TAKDemuxContext *tc = s->priv_data;
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AVIOContext *pb = s->pb;
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GetBitContext gb;
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AVStream *st;
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uint8_t *buffer = NULL;
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int ret;
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st = avformat_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_TAK;
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st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
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tc->mlast_frame = 0;
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if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) {
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avio_seek(pb, -4, SEEK_CUR);
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return 0;
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}
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while (!avio_feof(pb)) {
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enum TAKMetaDataType type;
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int size;
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type = avio_r8(pb) & 0x7f;
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size = avio_rl24(pb);
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switch (type) {
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case TAK_METADATA_STREAMINFO:
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if (st->codecpar->extradata)
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return AVERROR_INVALIDDATA;
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case TAK_METADATA_LAST_FRAME:
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case TAK_METADATA_ENCODER:
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if (size <= 3)
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return AVERROR_INVALIDDATA;
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buffer = av_malloc(size - 3 + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!buffer)
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return AVERROR(ENOMEM);
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memset(buffer + size - 3, 0, AV_INPUT_BUFFER_PADDING_SIZE);
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ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
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if (avio_read(pb, buffer, size - 3) != size - 3) {
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av_freep(&buffer);
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return AVERROR(EIO);
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}
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if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
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av_log(s, AV_LOG_ERROR, "%d metadata block CRC error.\n", type);
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if (s->error_recognition & AV_EF_EXPLODE) {
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av_freep(&buffer);
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return AVERROR_INVALIDDATA;
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}
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}
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break;
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case TAK_METADATA_MD5: {
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uint8_t md5[16];
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int i;
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if (size != 19)
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return AVERROR_INVALIDDATA;
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ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
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avio_read(pb, md5, 16);
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if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
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av_log(s, AV_LOG_ERROR, "MD5 metadata block CRC error.\n");
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if (s->error_recognition & AV_EF_EXPLODE)
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return AVERROR_INVALIDDATA;
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}
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av_log(s, AV_LOG_VERBOSE, "MD5=");
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for (i = 0; i < 16; i++)
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av_log(s, AV_LOG_VERBOSE, "%02x", md5[i]);
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av_log(s, AV_LOG_VERBOSE, "\n");
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break;
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}
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case TAK_METADATA_END: {
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int64_t curpos = avio_tell(pb);
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if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
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ff_ape_parse_tag(s);
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avio_seek(pb, curpos, SEEK_SET);
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}
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tc->data_end += curpos;
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return 0;
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}
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default:
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ret = avio_skip(pb, size);
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if (ret < 0)
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return ret;
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}
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if (type == TAK_METADATA_STREAMINFO) {
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TAKStreamInfo ti;
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ret = avpriv_tak_parse_streaminfo(&ti, buffer, size -3);
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if (ret < 0)
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goto end;
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if (ti.samples > 0)
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st->duration = ti.samples;
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st->codecpar->bits_per_coded_sample = ti.bps;
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if (ti.ch_layout)
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st->codecpar->channel_layout = ti.ch_layout;
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st->codecpar->sample_rate = ti.sample_rate;
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st->codecpar->channels = ti.channels;
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st->start_time = 0;
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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st->codecpar->extradata = buffer;
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st->codecpar->extradata_size = size - 3;
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buffer = NULL;
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} else if (type == TAK_METADATA_LAST_FRAME) {
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if (size != 11) {
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ret = AVERROR_INVALIDDATA;
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goto end;
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}
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init_get_bits8(&gb, buffer, size - 3);
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tc->mlast_frame = 1;
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tc->data_end = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) +
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get_bits(&gb, TAK_LAST_FRAME_SIZE_BITS);
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av_freep(&buffer);
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} else if (type == TAK_METADATA_ENCODER) {
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init_get_bits8(&gb, buffer, size - 3);
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av_log(s, AV_LOG_VERBOSE, "encoder version: %0X\n",
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get_bits_long(&gb, TAK_ENCODER_VERSION_BITS));
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av_freep(&buffer);
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}
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}
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return AVERROR_EOF;
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end:
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av_freep(&buffer);
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return ret;
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}
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static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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TAKDemuxContext *tc = s->priv_data;
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int ret;
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if (tc->mlast_frame) {
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AVIOContext *pb = s->pb;
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int64_t size, left;
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left = tc->data_end - avio_tell(pb);
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size = FFMIN(left, 1024);
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if (size <= 0)
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return AVERROR_EOF;
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ret = av_get_packet(pb, pkt, size);
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if (ret < 0)
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return ret;
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pkt->stream_index = 0;
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} else {
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ret = ff_raw_read_partial_packet(s, pkt);
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}
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return ret;
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}
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FF_RAW_DEMUXER_CLASS(tak)
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AVInputFormat ff_tak_demuxer = {
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.name = "tak",
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.long_name = NULL_IF_CONFIG_SMALL("raw TAK"),
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.priv_data_size = sizeof(TAKDemuxContext),
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.read_probe = tak_probe,
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.read_header = tak_read_header,
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.read_packet = raw_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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.extensions = "tak",
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.raw_codec_id = AV_CODEC_ID_TAK,
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.priv_class = &tak_demuxer_class,
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};
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