tta.c 5.71 KB
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/*
 * TTA demuxer
 * Copyright (c) 2006 Alex Beregszaszi
 *
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 * This file is part of FFmpeg.
 *
 * 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
 * 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
 * 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
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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 "libavcodec/get_bits.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 "id3v1.h"
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#include "libavutil/crc.h"
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#include "libavutil/dict.h"
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typedef struct {
    int totalframes, currentframe;
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    int frame_size;
    int last_frame_size;
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} TTAContext;

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static unsigned long tta_check_crc(unsigned long checksum, const uint8_t *buf,
                                   unsigned int len)
{
    return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
}

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static int tta_probe(AVProbeData *p)
{
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    if (AV_RL32(&p->buf[0]) == MKTAG('T', 'T', 'A', '1') &&
        (AV_RL16(&p->buf[4]) == 1 || AV_RL16(&p->buf[4]) == 2) &&
        AV_RL16(&p->buf[6]) > 0 &&
        AV_RL16(&p->buf[8]) > 0 &&
        AV_RL32(&p->buf[10]) > 0)
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        return AVPROBE_SCORE_EXTENSION + 30;
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    return 0;
}

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static int tta_read_header(AVFormatContext *s)
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{
    TTAContext *c = s->priv_data;
    AVStream *st;
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    int i, channels, bps, samplerate;
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    uint64_t framepos, start_offset;
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    uint32_t nb_samples, crc;
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    ff_id3v1_read(s);
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    start_offset = avio_tell(s->pb);
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    ffio_init_checksum(s->pb, tta_check_crc, UINT32_MAX);
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    if (avio_rl32(s->pb) != AV_RL32("TTA1"))
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        return AVERROR_INVALIDDATA;
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    avio_skip(s->pb, 2); // FIXME: flags
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    channels = avio_rl16(s->pb);
    bps = avio_rl16(s->pb);
    samplerate = avio_rl32(s->pb);
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    if(samplerate <= 0 || samplerate > 1000000){
        av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
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        return AVERROR_INVALIDDATA;
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    }

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    nb_samples = avio_rl32(s->pb);
    if (!nb_samples) {
        av_log(s, AV_LOG_ERROR, "invalid number of samples\n");
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        return AVERROR_INVALIDDATA;
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    }

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    crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
    if (crc != avio_rl32(s->pb)) {
        av_log(s, AV_LOG_ERROR, "Header CRC error\n");
        return AVERROR_INVALIDDATA;
    }
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    c->frame_size      = samplerate * 256 / 245;
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    c->last_frame_size = nb_samples % c->frame_size;
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    if (!c->last_frame_size)
        c->last_frame_size = c->frame_size;
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    c->totalframes = nb_samples / c->frame_size + (c->last_frame_size < c->frame_size);
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    c->currentframe = 0;

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    if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){
        av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes);
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        return AVERROR_INVALIDDATA;
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    }
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    st = avformat_new_stream(s, NULL);
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    if (!st)
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        return AVERROR(ENOMEM);
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    avpriv_set_pts_info(st, 64, 1, samplerate);
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    st->start_time = 0;
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    st->duration = nb_samples;
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    framepos = avio_tell(s->pb) + 4*c->totalframes + 4;
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    if (ff_alloc_extradata(st->codec, avio_tell(s->pb) - start_offset))
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        return AVERROR(ENOMEM);

    avio_seek(s->pb, start_offset, SEEK_SET);
    avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);

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    ffio_init_checksum(s->pb, tta_check_crc, UINT32_MAX);
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    for (i = 0; i < c->totalframes; i++) {
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        uint32_t size = avio_rl32(s->pb);
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        av_add_index_entry(st, framepos, i * c->frame_size, size, 0,
                           AVINDEX_KEYFRAME);
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        framepos += size;
    }
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    crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
    if (crc != avio_rl32(s->pb)) {
        av_log(s, AV_LOG_ERROR, "Seek table CRC error\n");
        return AVERROR_INVALIDDATA;
    }
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    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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    st->codec->codec_id = AV_CODEC_ID_TTA;
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    st->codec->channels = channels;
    st->codec->sample_rate = samplerate;
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    st->codec->bits_per_coded_sample = bps;
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    if (s->pb->seekable) {
        int64_t pos = avio_tell(s->pb);
        ff_ape_parse_tag(s);
        avio_seek(s->pb, pos, SEEK_SET);
    }

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    return 0;
}

static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    TTAContext *c = s->priv_data;
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    AVStream *st = s->streams[0];
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    int size, ret;
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    // FIXME!
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    if (c->currentframe >= c->totalframes)
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        return AVERROR_EOF;
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    size = st->index_entries[c->currentframe].size;
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    ret = av_get_packet(s->pb, pkt, size);
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    pkt->dts = st->index_entries[c->currentframe++].timestamp;
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    pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size :
                                                        c->frame_size;
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    return ret;
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}

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static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
    TTAContext *c = s->priv_data;
    AVStream *st = s->streams[stream_index];
    int index = av_index_search_timestamp(st, timestamp, flags);
    if (index < 0)
        return -1;
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    if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
        return -1;
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    c->currentframe = index;

    return 0;
}

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AVInputFormat ff_tta_demuxer = {
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    .name           = "tta",
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    .long_name      = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
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    .priv_data_size = sizeof(TTAContext),
    .read_probe     = tta_probe,
    .read_header    = tta_read_header,
    .read_packet    = tta_read_packet,
    .read_seek      = tta_read_seek,
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    .extensions     = "tta",
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};