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ffmpeg / libavformat / vqf.c @ b7effd4e

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/*
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 * VQF demuxer
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 * Copyright (c) 2009 Vitor Sessak
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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 "avformat.h"
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#include "libavutil/intreadwrite.h"
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typedef struct VqfContext {
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    int frame_bit_len;
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    uint8_t last_frame_bits;
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    int remaining_bits;
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} VqfContext;
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static int vqf_probe(AVProbeData *probe_packet)
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{
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    if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
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        return 0;
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    if (!memcmp(probe_packet->buf + 4, "97012000", 8))
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        return AVPROBE_SCORE_MAX;
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    if (!memcmp(probe_packet->buf + 4, "00052200", 8))
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        return AVPROBE_SCORE_MAX;
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    return AVPROBE_SCORE_MAX/2;
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}
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static void add_metadata(AVFormatContext *s, const char *tag,
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                         unsigned int tag_len, unsigned int remaining)
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{
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    int len = FFMIN(tag_len, remaining);
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    char *buf;
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    if (len == UINT_MAX)
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        return;
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    buf = av_malloc(len+1);
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    if (!buf)
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        return;
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    avio_read(s->pb, buf, len);
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    buf[len] = 0;
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    av_metadata_set2(&s->metadata, tag, buf, AV_METADATA_DONT_STRDUP_VAL);
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}
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static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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    VqfContext *c = s->priv_data;
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    AVStream *st  = av_new_stream(s, 0);
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    int chunk_tag;
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    int rate_flag = -1;
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    int header_size;
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    int read_bitrate = 0;
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    int size;
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    if (!st)
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        return AVERROR(ENOMEM);
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    url_fskip(s->pb, 12);
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    header_size = avio_rb32(s->pb);
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    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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    st->codec->codec_id   = CODEC_ID_TWINVQ;
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    st->start_time = 0;
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    do {
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        int len;
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        chunk_tag = avio_rl32(s->pb);
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        if (chunk_tag == MKTAG('D','A','T','A'))
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            break;
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        len = avio_rb32(s->pb);
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        if ((unsigned) len > INT_MAX/2) {
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            av_log(s, AV_LOG_ERROR, "Malformed header\n");
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            return -1;
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        }
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        header_size -= 8;
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        switch(chunk_tag){
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        case MKTAG('C','O','M','M'):
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            st->codec->channels = avio_rb32(s->pb) + 1;
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            read_bitrate        = avio_rb32(s->pb);
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            rate_flag           = avio_rb32(s->pb);
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            url_fskip(s->pb, len-12);
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            st->codec->bit_rate              = read_bitrate*1000;
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            st->codec->bits_per_coded_sample = 16;
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            break;
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        case MKTAG('N','A','M','E'):
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            add_metadata(s, "title"    , len, header_size);
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            break;
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        case MKTAG('(','c',')',' '):
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            add_metadata(s, "copyright", len, header_size);
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            break;
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        case MKTAG('A','U','T','H'):
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            add_metadata(s, "author"   , len, header_size);
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            break;
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        case MKTAG('A','L','B','M'):
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            add_metadata(s, "album"    , len, header_size);
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            break;
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        case MKTAG('T','R','C','K'):
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            add_metadata(s, "track"    , len, header_size);
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            break;
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        case MKTAG('C','O','M','T'):
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            add_metadata(s, "comment"  , len, header_size);
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            break;
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        case MKTAG('F','I','L','E'):
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            add_metadata(s, "filename" , len, header_size);
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            break;
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        case MKTAG('D','S','I','Z'):
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            add_metadata(s, "size"     , len, header_size);
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            break;
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        case MKTAG('D','A','T','E'):
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            add_metadata(s, "date"     , len, header_size);
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            break;
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        case MKTAG('G','E','N','R'):
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            add_metadata(s, "genre"    , len, header_size);
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            break;
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        default:
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            av_log(s, AV_LOG_ERROR, "Unknown chunk: %c%c%c%c\n",
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                   ((char*)&chunk_tag)[0], ((char*)&chunk_tag)[1],
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                   ((char*)&chunk_tag)[2], ((char*)&chunk_tag)[3]);
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            url_fskip(s->pb, FFMIN(len, header_size));
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            break;
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        }
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        header_size -= len;
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    } while (header_size >= 0);
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    switch (rate_flag) {
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    case -1:
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        av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
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        return -1;
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    case 44:
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        st->codec->sample_rate = 44100;
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        break;
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    case 22:
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        st->codec->sample_rate = 22050;
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        break;
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    case 11:
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        st->codec->sample_rate = 11025;
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        break;
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    default:
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        st->codec->sample_rate = rate_flag*1000;
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        break;
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    }
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    switch (((st->codec->sample_rate/1000) << 8) +
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            read_bitrate/st->codec->channels) {
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    case (11<<8) + 8 :
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    case (8 <<8) + 8 :
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    case (11<<8) + 10:
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    case (22<<8) + 32:
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        size = 512;
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        break;
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    case (16<<8) + 16:
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    case (22<<8) + 20:
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    case (22<<8) + 24:
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        size = 1024;
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        break;
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    case (44<<8) + 40:
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    case (44<<8) + 48:
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        size = 2048;
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        break;
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    default:
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        av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n",
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               st->codec->sample_rate, st->codec->bit_rate);
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        return -1;
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    }
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    c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
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    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
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    return 0;
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}
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static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    VqfContext *c = s->priv_data;
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    int ret;
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    int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
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    pkt->pos          = url_ftell(s->pb);
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    pkt->stream_index = 0;
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    if (av_new_packet(pkt, size+2) < 0)
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        return AVERROR(EIO);
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    pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
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    pkt->data[1] = c->last_frame_bits;
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    ret = avio_read(s->pb, pkt->data+2, size);
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    if (ret<=0) {
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        av_free_packet(pkt);
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        return AVERROR(EIO);
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    }
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    c->last_frame_bits = pkt->data[size+1];
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    c->remaining_bits  = (size << 3) - c->frame_bit_len + c->remaining_bits;
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    return size+2;
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}
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static int vqf_read_seek(AVFormatContext *s,
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                         int stream_index, int64_t timestamp, int flags)
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{
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    VqfContext *c = s->priv_data;
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    AVStream *st;
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    int ret;
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    int64_t pos;
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    st = s->streams[stream_index];
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    pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
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                         st->time_base.num,
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                         st->time_base.den * (int64_t)c->frame_bit_len,
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                         (flags & AVSEEK_FLAG_BACKWARD) ?
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                                                   AV_ROUND_DOWN : AV_ROUND_UP);
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    pos *= c->frame_bit_len;
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    st->cur_dts = av_rescale(pos, st->time_base.den,
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                             st->codec->bit_rate * (int64_t)st->time_base.num);
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    if ((ret = url_fseek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
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        return ret;
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    c->remaining_bits = -7 - ((pos-7)&7);
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    return 0;
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}
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AVInputFormat ff_vqf_demuxer = {
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    "vqf",
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    NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
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    sizeof(VqfContext),
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    vqf_probe,
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    vqf_read_header,
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    vqf_read_packet,
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    NULL,
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    vqf_read_seek,
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    .extensions = "vqf",
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};