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ffmpeg / libavformat / siff.c @ 72415b2a

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/*
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 * Beam Software SIFF demuxer
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 * Copyright (c) 2007 Konstantin Shishkov
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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 "libavutil/intreadwrite.h"
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#include "avformat.h"
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enum SIFFTags{
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    TAG_SIFF = MKTAG('S', 'I', 'F', 'F'),
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    TAG_BODY = MKTAG('B', 'O', 'D', 'Y'),
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    TAG_VBHD = MKTAG('V', 'B', 'H', 'D'),
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    TAG_SHDR = MKTAG('S', 'H', 'D', 'R'),
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    TAG_VBV1 = MKTAG('V', 'B', 'V', '1'),
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    TAG_SOUN = MKTAG('S', 'O', 'U', 'N'),
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};
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enum VBFlags{
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    VB_HAS_GMC     = 0x01,
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    VB_HAS_AUDIO   = 0x04,
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    VB_HAS_VIDEO   = 0x08,
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    VB_HAS_PALETTE = 0x10,
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    VB_HAS_LENGTH  = 0x20
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};
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typedef struct SIFFContext{
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    int frames;
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    int cur_frame;
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    int rate;
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    int bits;
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    int block_align;
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    int has_video;
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    int has_audio;
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    int curstrm;
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    int pktsize;
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    int gmcsize;
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    int sndsize;
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    int flags;
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    uint8_t gmc[4];
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}SIFFContext;
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static int siff_probe(AVProbeData *p)
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{
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    uint32_t tag = AV_RL32(p->buf + 8);
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    /* check file header */
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    if (AV_RL32(p->buf) != TAG_SIFF ||
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        (tag != TAG_VBV1 && tag != TAG_SOUN))
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        return 0;
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    return AVPROBE_SCORE_MAX;
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}
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static int create_audio_stream(AVFormatContext *s, SIFFContext *c)
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{
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    AVStream *ast;
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    ast = av_new_stream(s, 0);
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    if (!ast)
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        return -1;
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    ast->codec->codec_type      = AVMEDIA_TYPE_AUDIO;
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    ast->codec->codec_id        = CODEC_ID_PCM_U8;
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    ast->codec->channels        = 1;
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    ast->codec->bits_per_coded_sample = c->bits;
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    ast->codec->sample_rate     = c->rate;
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    ast->codec->frame_size      = c->block_align;
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    av_set_pts_info(ast, 16, 1, c->rate);
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    return 0;
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}
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static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, ByteIOContext *pb)
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{
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    AVStream *st;
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    int width, height;
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    if (get_le32(pb) != TAG_VBHD){
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        av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
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        return -1;
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    }
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    if(get_be32(pb) != 32){
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        av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
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        return -1;
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    }
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    if(get_le16(pb) != 1){
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        av_log(s, AV_LOG_ERROR, "Incorrect header version\n");
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        return -1;
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    }
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    width = get_le16(pb);
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    height = get_le16(pb);
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    url_fskip(pb, 4);
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    c->frames = get_le16(pb);
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    if(!c->frames){
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        av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
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        return -1;
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    }
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    c->bits = get_le16(pb);
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    c->rate = get_le16(pb);
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    c->block_align = c->rate * (c->bits >> 3);
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    url_fskip(pb, 16); //zeroes
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    st = av_new_stream(s, 0);
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    if (!st)
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        return -1;
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    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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    st->codec->codec_id   = CODEC_ID_VB;
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    st->codec->codec_tag  = MKTAG('V', 'B', 'V', '1');
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    st->codec->width      = width;
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    st->codec->height     = height;
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    st->codec->pix_fmt    = PIX_FMT_PAL8;
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    av_set_pts_info(st, 16, 1, 12);
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    c->cur_frame = 0;
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    c->has_video = 1;
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    c->has_audio = !!c->rate;
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    c->curstrm = -1;
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    if (c->has_audio && create_audio_stream(s, c) < 0)
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        return -1;
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    return 0;
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}
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static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, ByteIOContext *pb)
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{
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    if (get_le32(pb) != TAG_SHDR){
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        av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
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        return -1;
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    }
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    if(get_be32(pb) != 8){
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        av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
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        return -1;
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    }
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    url_fskip(pb, 4); //unknown value
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    c->rate = get_le16(pb);
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    c->bits = get_le16(pb);
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    c->block_align = c->rate * (c->bits >> 3);
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    return create_audio_stream(s, c);
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}
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static int siff_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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    ByteIOContext *pb = s->pb;
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    SIFFContext *c = s->priv_data;
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    uint32_t tag;
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    if (get_le32(pb) != TAG_SIFF)
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        return -1;
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    url_fskip(pb, 4); //ignore size
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    tag = get_le32(pb);
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    if (tag != TAG_VBV1 && tag != TAG_SOUN){
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        av_log(s, AV_LOG_ERROR, "Not a VBV file\n");
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        return -1;
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    }
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    if (tag == TAG_VBV1 && siff_parse_vbv1(s, c, pb) < 0)
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        return -1;
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    if (tag == TAG_SOUN && siff_parse_soun(s, c, pb) < 0)
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        return -1;
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    if (get_le32(pb) != MKTAG('B', 'O', 'D', 'Y')){
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        av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");
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        return -1;
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    }
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    url_fskip(pb, 4); //ignore size
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    return 0;
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}
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static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    SIFFContext *c = s->priv_data;
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    int size;
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    if (c->has_video){
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        if (c->cur_frame >= c->frames)
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            return AVERROR(EIO);
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        if (c->curstrm == -1){
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            c->pktsize = get_le32(s->pb) - 4;
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            c->flags = get_le16(s->pb);
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            c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
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            if (c->gmcsize)
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                get_buffer(s->pb, c->gmc, c->gmcsize);
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            c->sndsize = (c->flags & VB_HAS_AUDIO) ? get_le32(s->pb): 0;
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            c->curstrm = !!(c->flags & VB_HAS_AUDIO);
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        }
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        if (!c->curstrm){
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            size = c->pktsize - c->sndsize;
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            if (av_new_packet(pkt, size) < 0)
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                return AVERROR(ENOMEM);
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            AV_WL16(pkt->data, c->flags);
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            if (c->gmcsize)
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                memcpy(pkt->data + 2, c->gmc, c->gmcsize);
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            get_buffer(s->pb, pkt->data + 2 + c->gmcsize, size - c->gmcsize - 2);
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            pkt->stream_index = 0;
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            c->curstrm = -1;
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        }else{
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            if (av_get_packet(s->pb, pkt, c->sndsize - 4) < 0)
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                return AVERROR(EIO);
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            pkt->stream_index = 1;
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            c->curstrm = 0;
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        }
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        if(!c->cur_frame || c->curstrm)
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            pkt->flags |= PKT_FLAG_KEY;
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        if (c->curstrm == -1)
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            c->cur_frame++;
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    }else{
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        size = av_get_packet(s->pb, pkt, c->block_align);
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        if(size <= 0)
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            return AVERROR(EIO);
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    }
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    return pkt->size;
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}
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AVInputFormat siff_demuxer = {
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    "siff",
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    NULL_IF_CONFIG_SMALL("Beam Software SIFF"),
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    sizeof(SIFFContext),
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    siff_probe,
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    siff_read_header,
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    siff_read_packet,
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    .extensions = "vb,son"
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};