PeerStreamer

/* Electronic Arts Multimedia File Demuxer

 * Copyright (c) 2004  The ffmpeg Project

 *

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

 *

 * This library 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 this library; if not, write to the Free Software

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

 */

/**

 * @file electronicarts.c

 * Electronic Arts Multimedia file demuxer (WVE/UV2/etc.)

 * by Robin Kay (komadori at gekkou.co.uk)

 */

#include "avformat.h"

#define SCHl_TAG MKTAG('S', 'C', 'H', 'l')

#define PT00_TAG MKTAG('P', 'T', 0x0, 0x0)

#define SCDl_TAG MKTAG('S', 'C', 'D', 'l')

#define pIQT_TAG MKTAG('p', 'I', 'Q', 'T')

#define SCEl_TAG MKTAG('S', 'C', 'E', 'l')

#define _TAG MKTAG('', '', '', '')

#define EA_SAMPLE_RATE 22050

#define EA_BITS_PER_SAMPLE 16

#define EA_PREAMBLE_SIZE 8

typedef struct EaDemuxContext {

    int width;

    int height;

    int video_stream_index;

    int track_count;

    int audio_stream_index;

    int audio_frame_counter;

    int64_t audio_pts;

    int64_t video_pts;

    int video_pts_inc;

    float fps;

    int num_channels;

    int num_samples;

    int compression_type;

} EaDemuxContext;

static uint32_t read_arbitary(ByteIOContext *pb) {

    uint8_t size, byte;

    int i;

    uint32_t word;

    size = get_byte(pb);

    word = 0;

    for (i = 0; i < size; i++) {

        byte = get_byte(pb);

        word <<= 8;

        word |= byte;

    }

    return word;

}

/*

 * Process WVE file header

 * Returns 1 if the WVE file is valid and successfully opened, 0 otherwise

 */

static int process_ea_header(AVFormatContext *s) {

    int inHeader;

    uint32_t blockid, size;

    EaDemuxContext *ea = (EaDemuxContext *)s->priv_data;

    ByteIOContext *pb = &s->pb;

    if (get_buffer(pb, (void*)&blockid, 4) != 4) {

        return 0;

    }

    if (le2me_32(blockid) != SCHl_TAG) {

        return 0;

    }

    if (get_buffer(pb, (void*)&size, 4) != 4) {

        return 0;

    }

    size = le2me_32(size);

    if (get_buffer(pb, (void*)&blockid, 4) != 4) {

        return 0;

    }

    if (le2me_32(blockid) != PT00_TAG) {

        av_log (s, AV_LOG_ERROR, "PT header missing\n");

        return 0;

    }

    inHeader = 1;

    while (inHeader) {

        int inSubheader;

        uint8_t byte;

        byte = get_byte(pb) & 0xFF;

        switch (byte) {

        case 0xFD:

            av_log (s, AV_LOG_INFO, "entered audio subheader\n");

            inSubheader = 1;

            while (inSubheader) {

                uint8_t subbyte;

                subbyte = get_byte(pb) & 0xFF;

                switch (subbyte) {

                case 0x82:

                    ea->num_channels = read_arbitary(pb);

                    av_log (s, AV_LOG_INFO, "num_channels (element 0x82) set to 0x%08x\n", ea->num_channels);

                    break;

                case 0x83:

                    ea->compression_type = read_arbitary(pb);

                    av_log (s, AV_LOG_INFO, "compression_type (element 0x83) set to 0x%08x\n", ea->compression_type);

                    break;

                case 0x85:

                    ea->num_samples = read_arbitary(pb);

                    av_log (s, AV_LOG_INFO, "num_samples (element 0x85) set to 0x%08x\n", ea->num_samples);

                    break;

                case 0x8A:

                    av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));

                    av_log (s, AV_LOG_INFO, "exited audio subheader\n");

                    inSubheader = 0;

                    break;

                default:

                    av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));

                    break;

                }

            }

            break;

        case 0xFF:

            av_log (s, AV_LOG_INFO, "end of header block reached\n");

            inHeader = 0;

            break;

        default:

            av_log (s, AV_LOG_INFO, "header element 0x%02x set to 0x%08x\n", byte, read_arbitary(pb));

            break;

        }

    }

    if ((ea->num_channels != 2) || (ea->compression_type != 7)) {

        av_log (s, AV_LOG_ERROR, "unsupported stream type\n");

        return 0;

    }

    /* skip to the start of the data */

    url_fseek(pb, size, SEEK_SET);

    return 1;

}

static int ea_probe(AVProbeData *p)

{

    if (p->buf_size < 4)

        return 0;

    if (LE_32(&p->buf[0]) != SCHl_TAG)

        return 0;

    return AVPROBE_SCORE_MAX;

}

static int ea_read_header(AVFormatContext *s,

                          AVFormatParameters *ap)

{

    EaDemuxContext *ea = (EaDemuxContext *)s->priv_data;

    AVStream *st;

    if (!process_ea_header(s))

        return AVERROR_IO;

#if 0

    /* initialize the video decoder stream */

    st = av_new_stream(s, 0);

    if (!st)

        return AVERROR_NOMEM;

    av_set_pts_info(st, 33, 1, 90000);

    ea->video_stream_index = st->index;

    st->codec->codec_type = CODEC_TYPE_VIDEO;

    st->codec->codec_id = CODEC_ID_EA_MJPEG;

    st->codec->codec_tag = 0;  /* no fourcc */

#endif

    /* initialize the audio decoder stream */

    st = av_new_stream(s, 0);

    if (!st)

        return AVERROR_NOMEM;

    av_set_pts_info(st, 33, 1, EA_SAMPLE_RATE);

    st->codec->codec_type = CODEC_TYPE_AUDIO;

    st->codec->codec_id = CODEC_ID_ADPCM_EA;

    st->codec->codec_tag = 0;  /* no tag */

    st->codec->channels = ea->num_channels;

    st->codec->sample_rate = EA_SAMPLE_RATE;

    st->codec->bits_per_sample = EA_BITS_PER_SAMPLE;

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

        st->codec->bits_per_sample / 4;

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

    ea->audio_stream_index = st->index;

    ea->audio_frame_counter = 0;

    return 1;

}

static int ea_read_packet(AVFormatContext *s,

                          AVPacket *pkt)

{

    EaDemuxContext *ea = s->priv_data;

    ByteIOContext *pb = &s->pb;

    int ret = 0;

    int packet_read = 0;

    unsigned char preamble[EA_PREAMBLE_SIZE];

    unsigned int chunk_type, chunk_size;

    while (!packet_read) {

        if (get_buffer(pb, preamble, EA_PREAMBLE_SIZE) != EA_PREAMBLE_SIZE)

            return AVERROR_IO;

        chunk_type = LE_32(&preamble[0]);

        chunk_size = LE_32(&preamble[4]) - EA_PREAMBLE_SIZE;

        switch (chunk_type) {

        /* audio data */

        case SCDl_TAG:

            ret = av_get_packet(pb, pkt, chunk_size);

            if (ret != chunk_size)

                ret = AVERROR_IO;

            else {

                    pkt->stream_index = ea->audio_stream_index;

                    pkt->pts = 90000;

                    pkt->pts *= ea->audio_frame_counter;

                    pkt->pts /= EA_SAMPLE_RATE;

                    /* 2 samples/byte, 1 or 2 samples per frame depending

                     * on stereo; chunk also has 12-byte header */

                    ea->audio_frame_counter += ((chunk_size - 12) * 2) /

                        ea->num_channels;

            }

            packet_read = 1;

            break;

        /* ending tag */

        case SCEl_TAG:

            ret = AVERROR_IO;

            packet_read = 1;

            break;

        default:

            url_fseek(pb, chunk_size, SEEK_CUR);

            break;

        }

        /* ending packet */

        if (chunk_type == SCEl_TAG) {

        }

    }

    return ret;

}

static int ea_read_close(AVFormatContext *s)

{

//    EaDemuxContext *ea = (EaDemuxContext *)s->priv_data;

    return 0;

}

static AVInputFormat ea_iformat = {

    "ea",

    "Electronic Arts Multimedia Format",

    sizeof(EaDemuxContext),

    ea_probe,

    ea_read_header,

    ea_read_packet,

    ea_read_close,

};

int ea_init(void)

{

    av_register_input_format(&ea_iformat);

    return 0;

}