swfdec.c 7.57 KB
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/*
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 * Flash Compatible Streaming Format demuxer
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 * Copyright (c) 2000 Fabrice Bellard
 * Copyright (c) 2003 Tinic Uro
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 *
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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
 * version 2.1 of the License, or (at your option) any later version.
 *
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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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#include "libavutil/intreadwrite.h"
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#include "swf.h"

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static const AVCodecTag swf_audio_codec_tags[] = {
    { CODEC_ID_PCM_S16LE,  0x00 },
    { CODEC_ID_ADPCM_SWF,  0x01 },
    { CODEC_ID_MP3,        0x02 },
    { CODEC_ID_PCM_S16LE,  0x03 },
//  { CODEC_ID_NELLYMOSER, 0x06 },
    { CODEC_ID_NONE,          0 },
};

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static int get_swf_tag(AVIOContext *pb, int *len_ptr)
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{
    int tag, len;

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    if (pb->eof_reached)
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        return -1;

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    tag = avio_rl16(pb);
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    len = tag & 0x3f;
    tag = tag >> 6;
    if (len == 0x3f) {
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        len = avio_rl32(pb);
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    }
//    av_log(NULL, AV_LOG_DEBUG, "Tag: %d - Len: %d\n", tag, len);
    *len_ptr = len;
    return tag;
}


static int swf_probe(AVProbeData *p)
{
    /* check file header */
    if ((p->buf[0] == 'F' || p->buf[0] == 'C') && p->buf[1] == 'W' &&
        p->buf[2] == 'S')
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

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static int swf_read_header(AVFormatContext *s)
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{
    SWFContext *swf = s->priv_data;
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    AVIOContext *pb = s->pb;
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    int nbits, len, tag;

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    tag = avio_rb32(pb) & 0xffffff00;
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    if (tag == MKBETAG('C', 'W', 'S', 0)) {
        av_log(s, AV_LOG_ERROR, "Compressed SWF format not supported\n");
        return AVERROR(EIO);
    }
    if (tag != MKBETAG('F', 'W', 'S', 0))
        return AVERROR(EIO);
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    avio_rl32(pb);
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    /* skip rectangle size */
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    nbits = avio_r8(pb) >> 3;
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    len = (4 * nbits - 3 + 7) / 8;
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    avio_skip(pb, len);
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    swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
    avio_rl16(pb); /* frame count */
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    swf->samples_per_frame = 0;
    s->ctx_flags |= AVFMTCTX_NOHEADER;
    return 0;
}

static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    SWFContext *swf = s->priv_data;
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    AVIOContext *pb = s->pb;
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    AVStream *vst = NULL, *ast = NULL, *st = 0;
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    int tag, len, i, frame, v, res;
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    for(;;) {
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        uint64_t pos = avio_tell(pb);
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        tag = get_swf_tag(pb, &len);
        if (tag < 0)
            return AVERROR(EIO);
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        if (tag == TAG_VIDEOSTREAM) {
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            int ch_id = avio_rl16(pb);
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            len -= 2;

            for (i=0; i<s->nb_streams; i++) {
                st = s->streams[i];
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                if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
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                    goto skip;
            }

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            avio_rl16(pb);
            avio_rl16(pb);
            avio_rl16(pb);
            avio_r8(pb);
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            /* Check for FLV1 */
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            vst = avformat_new_stream(s, NULL);
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            if (!vst)
                return -1;
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            vst->id = ch_id;
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            vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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            vst->codec->codec_id = ff_codec_get_id(swf_codec_tags, avio_r8(pb));
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            avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
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            len -= 8;
        } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
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            /* streaming found */
            int sample_rate_code;
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            for (i=0; i<s->nb_streams; i++) {
                st = s->streams[i];
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                if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
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                    goto skip;
            }

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            avio_r8(pb);
            v = avio_r8(pb);
            swf->samples_per_frame = avio_rl16(pb);
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            ast = avformat_new_stream(s, NULL);
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            if (!ast)
                return -1;
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            ast->id = -1; /* -1 to avoid clash with video stream ch_id */
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            ast->codec->channels = 1 + (v&1);
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            ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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            ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
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            ast->need_parsing = AVSTREAM_PARSE_FULL;
            sample_rate_code= (v>>2) & 3;
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            ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
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            avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
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            len -= 4;
        } else if (tag == TAG_VIDEOFRAME) {
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            int ch_id = avio_rl16(pb);
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            len -= 2;
            for(i=0; i<s->nb_streams; i++) {
                st = s->streams[i];
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                if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
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                    frame = avio_rl16(pb);
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                    if ((res = av_get_packet(pb, pkt, len-2)) < 0)
                        return res;
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                    pkt->pos = pos;
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                    pkt->pts = frame;
                    pkt->stream_index = st->index;
                    return pkt->size;
                }
            }
        } else if (tag == TAG_STREAMBLOCK) {
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            for (i = 0; i < s->nb_streams; i++) {
                st = s->streams[i];
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                if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
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            if (st->codec->codec_id == AV_CODEC_ID_MP3) {
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                avio_skip(pb, 4);
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                if ((res = av_get_packet(pb, pkt, len-4)) < 0)
                    return res;
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            } else { // ADPCM, PCM
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                if ((res = av_get_packet(pb, pkt, len)) < 0)
                    return res;
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            }
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            pkt->pos = pos;
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            pkt->stream_index = st->index;
            return pkt->size;
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                }
            }
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        } else if (tag == TAG_JPEG2) {
            for (i=0; i<s->nb_streams; i++) {
                st = s->streams[i];
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                if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
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                    break;
            }
            if (i == s->nb_streams) {
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                vst = avformat_new_stream(s, NULL);
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                if (!vst)
                    return -1;
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                vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
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                vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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                vst->codec->codec_id = AV_CODEC_ID_MJPEG;
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                avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
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                st = vst;
            }
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            avio_rl16(pb); /* BITMAP_ID */
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            if ((res = av_new_packet(pkt, len-2)) < 0)
                return res;
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            avio_read(pb, pkt->data, 4);
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            if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
                AV_RB32(pkt->data) == 0xffd9ffd8) {
                /* old SWF files containing SOI/EOI as data start */
                /* files created by swink have reversed tag */
                pkt->size -= 4;
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                avio_read(pb, pkt->data, pkt->size);
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            } else {
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                avio_read(pb, pkt->data + 4, pkt->size - 4);
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            }
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            pkt->pos = pos;
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            pkt->stream_index = st->index;
            return pkt->size;
        }
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    skip:
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        avio_skip(pb, len);
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    }
}

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AVInputFormat ff_swf_demuxer = {
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    .name           = "swf",
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    .long_name      = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
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    .priv_data_size = sizeof(SWFContext),
    .read_probe     = swf_probe,
    .read_header    = swf_read_header,
    .read_packet    = swf_read_packet,
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};