PeerStreamer

/*

 * IFF (.iff) file demuxer

 * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>

 * Copyright (c) 2010 Peter Ross <pross@xvid.org>

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * 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

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

/**

 * @file libavformat/iff.c

 * IFF file demuxer

 * by Jaikrishnan Menon

 * for more information on the .iff file format, visit:

 * http://wiki.multimedia.cx/index.php?title=IFF

 */

#include "libavutil/intreadwrite.h"

#include "avformat.h"

#define ID_8SVX       MKTAG('8','S','V','X')

#define ID_VHDR       MKTAG('V','H','D','R')

#define ID_ATAK       MKTAG('A','T','A','K')

#define ID_RLSE       MKTAG('R','L','S','E')

#define ID_CHAN       MKTAG('C','H','A','N')

#define ID_PBM        MKTAG('P','B','M',' ')

#define ID_ILBM       MKTAG('I','L','B','M')

#define ID_BMHD       MKTAG('B','M','H','D')

#define ID_CMAP       MKTAG('C','M','A','P')

#define ID_FORM       MKTAG('F','O','R','M')

#define ID_ANNO       MKTAG('A','N','N','O')

#define ID_AUTH       MKTAG('A','U','T','H')

#define ID_CHRS       MKTAG('C','H','R','S')

#define ID_COPYRIGHT  MKTAG('(','c',')',' ')

#define ID_CSET       MKTAG('C','S','E','T')

#define ID_FVER       MKTAG('F','V','E','R')

#define ID_NAME       MKTAG('N','A','M','E')

#define ID_TEXT       MKTAG('T','E','X','T')

#define ID_BODY       MKTAG('B','O','D','Y')

#define LEFT    2

#define RIGHT   4

#define STEREO  6

#define PACKET_SIZE 1024

typedef enum {COMP_NONE, COMP_FIB, COMP_EXP} svx8_compression_type;

typedef enum {BITMAP_RAW, BITMAP_BYTERUN1} bitmap_compression_type;

typedef struct {

    uint32_t  body_size;

    uint32_t  sent_bytes;

    uint32_t  audio_frame_count;

} IffDemuxContext;

static void interleave_stereo(const uint8_t *src, uint8_t *dest, int size)

{

    uint8_t *end = dest + size;

    size = size>>1;

    while(dest < end) {

        *dest++ = *src;

        *dest++ = *(src+size);

        src++;

    }

}

static int iff_probe(AVProbeData *p)

{

    const uint8_t *d = p->buf;

    if ( AV_RL32(d)   == ID_FORM &&

         (AV_RL32(d+8) == ID_8SVX || AV_RL32(d+8) == ID_PBM || AV_RL32(d+8) == ID_ILBM) )

        return AVPROBE_SCORE_MAX;

    return 0;

}

static int iff_read_header(AVFormatContext *s,

                           AVFormatParameters *ap)

{

    IffDemuxContext *iff = s->priv_data;

    ByteIOContext *pb = s->pb;

    AVStream *st;

    uint32_t chunk_id, data_size;

    int padding, done = 0;

    int compression = -1;

    st = av_new_stream(s, 0);

    if (!st)

      return AVERROR(ENOMEM);

    st->codec->channels = 1;

    url_fskip(pb, 8);

    // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content

    st->codec->codec_tag = get_le32(pb);

    while(!done && !url_feof(pb)) {

        chunk_id = get_le32(pb);

        data_size = get_be32(pb);

        padding = data_size & 1;

        switch(chunk_id) {

        case ID_VHDR:

            st->codec->codec_type = CODEC_TYPE_AUDIO;

            url_fskip(pb, 12);

            st->codec->sample_rate = get_be16(pb);

            url_fskip(pb, 1);

            compression            = get_byte(pb);

            url_fskip(pb, 4);

            break;

        case ID_BODY:

            iff->body_size = data_size;

            done = 1;

            break;

        case ID_CHAN:

            st->codec->channels = (get_be32(pb) < 6) ? 1 : 2;

            break;

        case ID_CMAP:

            st->codec->extradata_size = data_size;

            st->codec->extradata      = av_malloc(data_size);

            if (!st->codec->extradata)

                return AVERROR(ENOMEM);

            if (get_buffer(pb, st->codec->extradata, data_size) < 0)

                return AVERROR(EIO);

            break;

        case ID_BMHD:

            st->codec->codec_type            = CODEC_TYPE_VIDEO;

            st->codec->width                 = get_be16(pb);

            st->codec->height                = get_be16(pb);

            url_fskip(pb, 4); // x, y offset

            st->codec->bits_per_coded_sample = get_byte(pb);

            url_fskip(pb, 1); // masking

            compression                      = get_byte(pb);

            url_fskip(pb, 3); // paddding, transparent

            st->sample_aspect_ratio.num      = get_byte(pb);

            st->sample_aspect_ratio.den      = get_byte(pb);

            url_fskip(pb, 4); // source page width, height

            break;

        default:

            url_fseek(pb, data_size + padding, SEEK_CUR);

            break;

        }

    }

    switch(st->codec->codec_type) {

    case CODEC_TYPE_AUDIO:

    av_set_pts_info(st, 32, 1, st->codec->sample_rate);

    switch(compression) {

    case COMP_NONE:

        st->codec->codec_id = CODEC_ID_PCM_S8;

        break;

    case COMP_FIB:

        st->codec->codec_id = CODEC_ID_8SVX_FIB;

        break;

    case COMP_EXP:

        st->codec->codec_id = CODEC_ID_8SVX_EXP;

        break;

    default:

        av_log(s, AV_LOG_ERROR, "iff: unknown compression method\n");

        return -1;

    }

    st->codec->bits_per_coded_sample = 8;

    st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;

    st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;

    break;

    case CODEC_TYPE_VIDEO:

        switch (compression) {

        case BITMAP_RAW:

            if (st->codec->codec_tag == ID_ILBM) {

                st->codec->codec_id = CODEC_ID_IFF_ILBM;

            } else {

                st->codec->codec_id = CODEC_ID_RAWVIDEO;

                st->codec->pix_fmt  = PIX_FMT_PAL8;

                st->codec->codec_tag = 0;

            }

            break;

        case BITMAP_BYTERUN1:

            st->codec->codec_id = CODEC_ID_IFF_BYTERUN1;

            break;

        default:

            av_log(s, AV_LOG_ERROR, "unknown compression method\n");

            return AVERROR_INVALIDDATA;

        }

        break;

    default:

        return -1;

    }

    return 0;

}

int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal);

static int iff_read_packet(AVFormatContext *s,

                           AVPacket *pkt)

{

    IffDemuxContext *iff = s->priv_data;

    ByteIOContext *pb = s->pb;

    AVStream *st = s->streams[0];

    int ret;

    if(iff->sent_bytes >= iff->body_size)

        return AVERROR(EIO);

    if(s->streams[0]->codec->channels == 2) {

        uint8_t sample_buffer[PACKET_SIZE];

        ret = get_buffer(pb, sample_buffer, PACKET_SIZE);

        if(av_new_packet(pkt, PACKET_SIZE) < 0) {

            av_log(s, AV_LOG_ERROR, "iff: cannot allocate packet \n");

            return AVERROR(ENOMEM);

        }

        interleave_stereo(sample_buffer, pkt->data, PACKET_SIZE);

    } else if (s->streams[0]->codec->codec_id == CODEC_ID_RAWVIDEO) {

        if(av_new_packet(pkt, iff->body_size + AVPALETTE_SIZE) < 0) {

            return AVERROR(ENOMEM);

        }

        ret = ff_cmap_read_palette(st->codec, (uint32_t*)(pkt->data + iff->body_size));

        if (ret < 0)

            return ret;

        av_freep(&st->codec->extradata);

        st->codec->extradata_size = 0;

        ret = get_buffer(pb, pkt->data, iff->body_size);

    } else if (s->streams[0]->codec->codec_type == CODEC_TYPE_VIDEO) {

        ret = av_get_packet(pb, pkt, iff->body_size);

    } else {

        ret = av_get_packet(pb, pkt, PACKET_SIZE);

    }

    if(iff->sent_bytes == 0)

        pkt->flags |= PKT_FLAG_KEY;

    if(s->streams[0]->codec->codec_type == CODEC_TYPE_AUDIO) {

        iff->sent_bytes += PACKET_SIZE;

    } else {

        iff->sent_bytes = iff->body_size;

    }

    pkt->stream_index = 0;

    if(s->streams[0]->codec->codec_type == CODEC_TYPE_AUDIO) {

        pkt->pts = iff->audio_frame_count;

        iff->audio_frame_count += ret / s->streams[0]->codec->channels;

    }

    return ret;

}

AVInputFormat iff_demuxer = {

    "IFF",

    NULL_IF_CONFIG_SMALL("IFF format"),

    sizeof(IffDemuxContext),

    iff_probe,

    iff_read_header,

    iff_read_packet,

};