4xm.c 11.7 KB
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/*
 * 4X Technologies .4xm File Demuxer (no muxer)
 * Copyright (c) 2003  The ffmpeg Project
 *
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 * This file is part of Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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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 * @file
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 * 4X Technologies file demuxer
 * by Mike Melanson (melanson@pcisys.net)
 * for more information on the .4xm file format, visit:
 *   http://www.pcisys.net/~melanson/codecs/
 */

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#include "libavutil/intreadwrite.h"
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#include "libavutil/intfloat.h"
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#include "avformat.h"
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#include "internal.h"
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#define     RIFF_TAG MKTAG('R', 'I', 'F', 'F')
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#define  FOURXMV_TAG MKTAG('4', 'X', 'M', 'V')
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#define     LIST_TAG MKTAG('L', 'I', 'S', 'T')
#define     HEAD_TAG MKTAG('H', 'E', 'A', 'D')
#define     TRK__TAG MKTAG('T', 'R', 'K', '_')
#define     MOVI_TAG MKTAG('M', 'O', 'V', 'I')
#define     VTRK_TAG MKTAG('V', 'T', 'R', 'K')
#define     STRK_TAG MKTAG('S', 'T', 'R', 'K')
#define     std__TAG MKTAG('s', 't', 'd', '_')
#define     name_TAG MKTAG('n', 'a', 'm', 'e')
#define     vtrk_TAG MKTAG('v', 't', 'r', 'k')
#define     strk_TAG MKTAG('s', 't', 'r', 'k')
#define     ifrm_TAG MKTAG('i', 'f', 'r', 'm')
#define     pfrm_TAG MKTAG('p', 'f', 'r', 'm')
#define     cfrm_TAG MKTAG('c', 'f', 'r', 'm')
#define     ifr2_TAG MKTAG('i', 'f', 'r', '2')
#define     pfr2_TAG MKTAG('p', 'f', 'r', '2')
#define     cfr2_TAG MKTAG('c', 'f', 'r', '2')
#define     snd__TAG MKTAG('s', 'n', 'd', '_')
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#define vtrk_SIZE 0x44
#define strk_SIZE 0x28

#define GET_LIST_HEADER() \
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    fourcc_tag = avio_rl32(pb); \
    size = avio_rl32(pb); \
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    if (fourcc_tag != LIST_TAG) \
        return AVERROR_INVALIDDATA; \
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    fourcc_tag = avio_rl32(pb);
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typedef struct AudioTrack {
    int sample_rate;
    int bits;
    int channels;
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    int stream_index;
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    int adpcm;
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    int64_t audio_pts;
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} AudioTrack;

typedef struct FourxmDemuxContext {
    int width;
    int height;
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    int video_stream_index;
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    int track_count;
    AudioTrack *tracks;
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    int64_t video_pts;
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    float fps;
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} FourxmDemuxContext;

static int fourxm_probe(AVProbeData *p)
{
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    if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
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        (AV_RL32(&p->buf[8]) != FOURXMV_TAG))
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        return 0;

    return AVPROBE_SCORE_MAX;
}

static int fourxm_read_header(AVFormatContext *s,
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                              AVFormatParameters *ap)
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{
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    AVIOContext *pb = s->pb;
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    unsigned int fourcc_tag;
    unsigned int size;
    int header_size;
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    FourxmDemuxContext *fourxm = s->priv_data;
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    unsigned char *header;
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    int i, ret;
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    AVStream *st;

    fourxm->track_count = 0;
    fourxm->tracks = NULL;
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    fourxm->fps = 1.0;
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    /* skip the first 3 32-bit numbers */
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    avio_skip(pb, 12);
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    /* check for LIST-HEAD */
    GET_LIST_HEADER();
    header_size = size - 4;
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    if (fourcc_tag != HEAD_TAG || header_size < 0)
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        return AVERROR_INVALIDDATA;

    /* allocate space for the header and load the whole thing */
    header = av_malloc(header_size);
    if (!header)
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        return AVERROR(ENOMEM);
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    if (avio_read(pb, header, header_size) != header_size){
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        av_free(header);
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        return AVERROR(EIO);
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    }
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    /* take the lazy approach and search for any and all vtrk and strk chunks */
    for (i = 0; i < header_size - 8; i++) {
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        fourcc_tag = AV_RL32(&header[i]);
        size = AV_RL32(&header[i + 4]);
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        if (fourcc_tag == std__TAG) {
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            fourxm->fps = av_int2float(AV_RL32(&header[i + 12]));
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        } else if (fourcc_tag == vtrk_TAG) {
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            /* check that there is enough data */
            if (size != vtrk_SIZE) {
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                ret= AVERROR_INVALIDDATA;
                goto fail;
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            }
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            fourxm->width  = AV_RL32(&header[i + 36]);
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            fourxm->height = AV_RL32(&header[i + 40]);
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            /* allocate a new AVStream */
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            st = avformat_new_stream(s, NULL);
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            if (!st){
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                ret= AVERROR(ENOMEM);
                goto fail;
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            }
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            avpriv_set_pts_info(st, 60, 1, fourxm->fps);
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            fourxm->video_stream_index = st->index;

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            st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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            st->codec->codec_id = CODEC_ID_4XM;
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            st->codec->extradata_size = 4;
            st->codec->extradata = av_malloc(4);
            AV_WL32(st->codec->extradata, AV_RL32(&header[i + 16]));
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            st->codec->width  = fourxm->width;
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            st->codec->height = fourxm->height;
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            i += 8 + size;
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        } else if (fourcc_tag == strk_TAG) {
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            int current_track;
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            /* check that there is enough data */
            if (size != strk_SIZE) {
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                ret= AVERROR_INVALIDDATA;
                goto fail;
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            }
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            current_track = AV_RL32(&header[i + 8]);
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            if((unsigned)current_track >= UINT_MAX / sizeof(AudioTrack) - 1){
                av_log(s, AV_LOG_ERROR, "current_track too large\n");
                ret= -1;
                goto fail;
            }
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            if (current_track + 1 > fourxm->track_count) {
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                fourxm->tracks = av_realloc(fourxm->tracks,
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                    (current_track + 1) * sizeof(AudioTrack));
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                if (!fourxm->tracks) {
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                    ret = AVERROR(ENOMEM);
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                    goto fail;
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                }
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                memset(&fourxm->tracks[fourxm->track_count], 0,
                       sizeof(AudioTrack) * (current_track + 1 - fourxm->track_count));
                fourxm->track_count = current_track + 1;
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            }
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            fourxm->tracks[current_track].adpcm       = AV_RL32(&header[i + 12]);
            fourxm->tracks[current_track].channels    = AV_RL32(&header[i + 36]);
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            fourxm->tracks[current_track].sample_rate = AV_RL32(&header[i + 40]);
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            fourxm->tracks[current_track].bits        = AV_RL32(&header[i + 44]);
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            fourxm->tracks[current_track].audio_pts   = 0;
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            if(   fourxm->tracks[current_track].channels    <= 0
               || fourxm->tracks[current_track].sample_rate <= 0
               || fourxm->tracks[current_track].bits        <  0){
                av_log(s, AV_LOG_ERROR, "audio header invalid\n");
                ret= -1;
                goto fail;
            }
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            i += 8 + size;
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            /* allocate a new AVStream */
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            st = avformat_new_stream(s, NULL);
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            if (!st){
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                ret= AVERROR(ENOMEM);
                goto fail;
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            }
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            st->id = current_track;
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            avpriv_set_pts_info(st, 60, 1, fourxm->tracks[current_track].sample_rate);
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            fourxm->tracks[current_track].stream_index = st->index;

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            st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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            st->codec->codec_tag = 0;
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            st->codec->channels              = fourxm->tracks[current_track].channels;
            st->codec->sample_rate           = fourxm->tracks[current_track].sample_rate;
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            st->codec->bits_per_coded_sample = fourxm->tracks[current_track].bits;
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            st->codec->bit_rate              = st->codec->channels * st->codec->sample_rate *
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                st->codec->bits_per_coded_sample;
            st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
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            if (fourxm->tracks[current_track].adpcm){
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                st->codec->codec_id = CODEC_ID_ADPCM_4XM;
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            }else if (st->codec->bits_per_coded_sample == 8){
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                st->codec->codec_id = CODEC_ID_PCM_U8;
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            }else
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                st->codec->codec_id = CODEC_ID_PCM_S16LE;
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        }
    }

    /* skip over the LIST-MOVI chunk (which is where the stream should be */
    GET_LIST_HEADER();
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    if (fourcc_tag != MOVI_TAG){
        ret= AVERROR_INVALIDDATA;
        goto fail;
    }
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    av_free(header);
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    /* initialize context members */
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    fourxm->video_pts = -1;  /* first frame will push to 0 */
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    return 0;
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fail:
    av_freep(&fourxm->tracks);
    av_free(header);
    return ret;
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}

static int fourxm_read_packet(AVFormatContext *s,
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                              AVPacket *pkt)
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{
    FourxmDemuxContext *fourxm = s->priv_data;
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    AVIOContext *pb = s->pb;
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    unsigned int fourcc_tag;
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    unsigned int size;
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    int ret = 0;
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    unsigned int track_number;
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    int packet_read = 0;
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    unsigned char header[8];
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    int audio_frame_count;
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    while (!packet_read) {

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        if ((ret = avio_read(s->pb, header, 8)) < 0)
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            return ret;
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        fourcc_tag = AV_RL32(&header[0]);
        size = AV_RL32(&header[4]);
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        if (pb->eof_reached)
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            return AVERROR(EIO);
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        switch (fourcc_tag) {

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        case LIST_TAG:
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            /* this is a good time to bump the video pts */
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            fourxm->video_pts ++;
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            /* skip the LIST-* tag and move on to the next fourcc */
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            avio_rl32(pb);
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            break;

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        case ifrm_TAG:
        case pfrm_TAG:
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        case cfrm_TAG:
        case ifr2_TAG:
        case pfr2_TAG:
        case cfr2_TAG:
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            /* allocate 8 more bytes than 'size' to account for fourcc
             * and size */
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            if (size + 8 < size || av_new_packet(pkt, size + 8))
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                return AVERROR(EIO);
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            pkt->stream_index = fourxm->video_stream_index;
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            pkt->pts = fourxm->video_pts;
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            pkt->pos = avio_tell(s->pb);
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            memcpy(pkt->data, header, 8);
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            ret = avio_read(s->pb, &pkt->data[8], size);
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            if (ret < 0){
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                av_free_packet(pkt);
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            }else
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                packet_read = 1;
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            break;
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        case snd__TAG:
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            track_number = avio_rl32(pb);
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            avio_skip(pb, 4);
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            size-=8;

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            if (track_number < fourxm->track_count && fourxm->tracks[track_number].channels>0) {
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                ret= av_get_packet(s->pb, pkt, size);
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                if(ret<0)
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                    return AVERROR(EIO);
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                pkt->stream_index =
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                    fourxm->tracks[track_number].stream_index;
                pkt->pts = fourxm->tracks[track_number].audio_pts;
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                packet_read = 1;
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                /* pts accounting */
                audio_frame_count = size;
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                if (fourxm->tracks[track_number].adpcm)
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                    audio_frame_count -=
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                        2 * (fourxm->tracks[track_number].channels);
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                audio_frame_count /=
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                      fourxm->tracks[track_number].channels;
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                if (fourxm->tracks[track_number].adpcm){
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                    audio_frame_count *= 2;
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                }else
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                    audio_frame_count /=
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                    (fourxm->tracks[track_number].bits / 8);
                fourxm->tracks[track_number].audio_pts += audio_frame_count;
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            } else {
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                avio_skip(pb, size);
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            }
            break;

        default:
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            avio_skip(pb, size);
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            break;
        }
    }
    return ret;
}

static int fourxm_read_close(AVFormatContext *s)
{
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    FourxmDemuxContext *fourxm = s->priv_data;
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    av_freep(&fourxm->tracks);
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    return 0;
}

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AVInputFormat ff_fourxm_demuxer = {
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    .name           = "4xm",
    .long_name      = NULL_IF_CONFIG_SMALL("4X Technologies format"),
    .priv_data_size = sizeof(FourxmDemuxContext),
    .read_probe     = fourxm_probe,
    .read_header    = fourxm_read_header,
    .read_packet    = fourxm_read_packet,
    .read_close     = fourxm_read_close,
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};