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ffmpeg / libavformat / smacker.c @ 470bce2b

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/*
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 * Smacker demuxer
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 * Copyright (c) 2006 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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/*
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 * Based on http://wiki.multimedia.cx/index.php?title=Smacker
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 */
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#include "libavutil/bswap.h"
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#include "avformat.h"
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#define SMACKER_PAL 0x01
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#define SMACKER_FLAG_RING_FRAME 0x01
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enum SAudFlags {
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    SMK_AUD_PACKED  = 0x80000000,
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    SMK_AUD_16BITS  = 0x20000000,
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    SMK_AUD_STEREO  = 0x10000000,
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    SMK_AUD_BINKAUD = 0x08000000,
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    SMK_AUD_USEDCT  = 0x04000000
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};
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typedef struct SmackerContext {
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    /* Smacker file header */
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    uint32_t magic;
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    uint32_t width, height;
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    uint32_t frames;
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    int      pts_inc;
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    uint32_t flags;
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    uint32_t audio[7];
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    uint32_t treesize;
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    uint32_t mmap_size, mclr_size, full_size, type_size;
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    uint32_t rates[7];
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    uint32_t pad;
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    /* frame info */
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    uint32_t *frm_size;
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    uint8_t  *frm_flags;
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    /* internal variables */
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    int cur_frame;
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    int is_ver4;
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    int64_t cur_pts;
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    /* current frame for demuxing */
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    uint8_t pal[768];
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    int indexes[7];
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    int videoindex;
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    uint8_t *bufs[7];
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    int buf_sizes[7];
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    int stream_id[7];
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    int curstream;
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    int64_t nextpos;
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    int64_t aud_pts[7];
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} SmackerContext;
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typedef struct SmackerFrame {
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    int64_t pts;
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    int stream;
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} SmackerFrame;
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/* palette used in Smacker */
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static const uint8_t smk_pal[64] = {
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    0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
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    0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
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    0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
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    0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
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    0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
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    0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
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    0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
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    0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
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};
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static int smacker_probe(AVProbeData *p)
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{
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    if(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K'
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        && (p->buf[3] == '2' || p->buf[3] == '4'))
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        return AVPROBE_SCORE_MAX;
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    else
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        return 0;
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}
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static int smacker_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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    ByteIOContext *pb = s->pb;
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    SmackerContext *smk = s->priv_data;
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    AVStream *st, *ast[7];
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    int i, ret;
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    int tbase;
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    /* read and check header */
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    smk->magic = get_le32(pb);
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    if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
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        return -1;
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    smk->width = get_le32(pb);
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    smk->height = get_le32(pb);
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    smk->frames = get_le32(pb);
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    smk->pts_inc = (int32_t)get_le32(pb);
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    smk->flags = get_le32(pb);
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    if(smk->flags & SMACKER_FLAG_RING_FRAME)
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        smk->frames++;
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    for(i = 0; i < 7; i++)
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        smk->audio[i] = get_le32(pb);
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    smk->treesize = get_le32(pb);
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    if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
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        av_log(s, AV_LOG_ERROR, "treesize too large\n");
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        return -1;
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    }
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//FIXME remove extradata "rebuilding"
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    smk->mmap_size = get_le32(pb);
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    smk->mclr_size = get_le32(pb);
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    smk->full_size = get_le32(pb);
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    smk->type_size = get_le32(pb);
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    for(i = 0; i < 7; i++)
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        smk->rates[i] = get_le32(pb);
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    smk->pad = get_le32(pb);
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    /* setup data */
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    if(smk->frames > 0xFFFFFF) {
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        av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
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        return -1;
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    }
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    smk->frm_size = av_malloc(smk->frames * 4);
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    smk->frm_flags = av_malloc(smk->frames);
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    smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
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    /* read frame info */
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    for(i = 0; i < smk->frames; i++) {
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        smk->frm_size[i] = get_le32(pb);
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    }
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    for(i = 0; i < smk->frames; i++) {
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        smk->frm_flags[i] = get_byte(pb);
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    }
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    /* init video codec */
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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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    smk->videoindex = st->index;
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    st->codec->width = smk->width;
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    st->codec->height = smk->height;
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    st->codec->pix_fmt = PIX_FMT_PAL8;
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    st->codec->codec_type = CODEC_TYPE_VIDEO;
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    st->codec->codec_id = CODEC_ID_SMACKVIDEO;
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    st->codec->codec_tag = smk->magic;
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    /* Smacker uses 100000 as internal timebase */
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    if(smk->pts_inc < 0)
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        smk->pts_inc = -smk->pts_inc;
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    else
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        smk->pts_inc *= 100;
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    tbase = 100000;
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    av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
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    av_set_pts_info(st, 33, smk->pts_inc, tbase);
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    /* handle possible audio streams */
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    for(i = 0; i < 7; i++) {
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        smk->indexes[i] = -1;
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        if((smk->rates[i] & 0xFFFFFF) && !(smk->rates[i] & SMK_AUD_BINKAUD)){
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            ast[i] = av_new_stream(s, 0);
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            smk->indexes[i] = ast[i]->index;
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            ast[i]->codec->codec_type = CODEC_TYPE_AUDIO;
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            ast[i]->codec->codec_id = (smk->rates[i] & SMK_AUD_PACKED) ? CODEC_ID_SMACKAUDIO : CODEC_ID_PCM_U8;
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            ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
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            ast[i]->codec->channels = (smk->rates[i] & SMK_AUD_STEREO) ? 2 : 1;
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            ast[i]->codec->sample_rate = smk->rates[i] & 0xFFFFFF;
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            ast[i]->codec->bits_per_coded_sample = (smk->rates[i] & SMK_AUD_16BITS) ? 16 : 8;
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            if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == CODEC_ID_PCM_U8)
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                ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
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            av_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate
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                    * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8);
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        }
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    }
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    /* load trees to extradata, they will be unpacked by decoder */
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    st->codec->extradata = av_malloc(smk->treesize + 16);
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    st->codec->extradata_size = smk->treesize + 16;
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    if(!st->codec->extradata){
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        av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
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        av_free(smk->frm_size);
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        av_free(smk->frm_flags);
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        return -1;
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    }
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    ret = get_buffer(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
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    if(ret != st->codec->extradata_size - 16){
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        av_free(smk->frm_size);
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        av_free(smk->frm_flags);
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        return AVERROR(EIO);
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    }
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    ((int32_t*)st->codec->extradata)[0] = le2me_32(smk->mmap_size);
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    ((int32_t*)st->codec->extradata)[1] = le2me_32(smk->mclr_size);
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    ((int32_t*)st->codec->extradata)[2] = le2me_32(smk->full_size);
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    ((int32_t*)st->codec->extradata)[3] = le2me_32(smk->type_size);
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    smk->curstream = -1;
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    smk->nextpos = url_ftell(pb);
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    return 0;
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}
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static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    SmackerContext *smk = s->priv_data;
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    int flags;
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    int ret;
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    int i;
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    int frame_size = 0;
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    int palchange = 0;
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    int pos;
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    if (url_feof(s->pb) || smk->cur_frame >= smk->frames)
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        return AVERROR(EIO);
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    /* if we demuxed all streams, pass another frame */
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    if(smk->curstream < 0) {
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        url_fseek(s->pb, smk->nextpos, 0);
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        frame_size = smk->frm_size[smk->cur_frame] & (~3);
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        flags = smk->frm_flags[smk->cur_frame];
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        /* handle palette change event */
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        pos = url_ftell(s->pb);
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        if(flags & SMACKER_PAL){
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            int size, sz, t, off, j, pos;
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            uint8_t *pal = smk->pal;
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            uint8_t oldpal[768];
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            memcpy(oldpal, pal, 768);
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            size = get_byte(s->pb);
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            size = size * 4 - 1;
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            frame_size -= size;
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            frame_size--;
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            sz = 0;
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            pos = url_ftell(s->pb) + size;
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            while(sz < 256){
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                t = get_byte(s->pb);
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                if(t & 0x80){ /* skip palette entries */
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                    sz += (t & 0x7F) + 1;
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                    pal += ((t & 0x7F) + 1) * 3;
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                } else if(t & 0x40){ /* copy with offset */
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                    off = get_byte(s->pb) * 3;
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                    j = (t & 0x3F) + 1;
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                    while(j-- && sz < 256) {
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                        *pal++ = oldpal[off + 0];
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                        *pal++ = oldpal[off + 1];
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                        *pal++ = oldpal[off + 2];
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                        sz++;
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                        off += 3;
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                    }
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                } else { /* new entries */
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                    *pal++ = smk_pal[t];
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                    *pal++ = smk_pal[get_byte(s->pb) & 0x3F];
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                    *pal++ = smk_pal[get_byte(s->pb) & 0x3F];
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                    sz++;
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                }
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            }
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            url_fseek(s->pb, pos, 0);
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            palchange |= 1;
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        }
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        flags >>= 1;
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        smk->curstream = -1;
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        /* if audio chunks are present, put them to stack and retrieve later */
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        for(i = 0; i < 7; i++) {
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            if(flags & 1) {
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                int size;
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                size = get_le32(s->pb) - 4;
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                frame_size -= size;
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                frame_size -= 4;
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                smk->curstream++;
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                smk->bufs[smk->curstream] = av_realloc(smk->bufs[smk->curstream], size);
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                smk->buf_sizes[smk->curstream] = size;
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                ret = get_buffer(s->pb, smk->bufs[smk->curstream], size);
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                if(ret != size)
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                    return AVERROR(EIO);
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                smk->stream_id[smk->curstream] = smk->indexes[i];
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            }
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            flags >>= 1;
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        }
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        if (av_new_packet(pkt, frame_size + 768))
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            return AVERROR(ENOMEM);
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        if(smk->frm_size[smk->cur_frame] & 1)
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            palchange |= 2;
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        pkt->data[0] = palchange;
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        memcpy(pkt->data + 1, smk->pal, 768);
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        ret = get_buffer(s->pb, pkt->data + 769, frame_size);
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        if(ret != frame_size)
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            return AVERROR(EIO);
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        pkt->stream_index = smk->videoindex;
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        pkt->size = ret + 769;
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        smk->cur_frame++;
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        smk->nextpos = url_ftell(s->pb);
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    } else {
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        if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
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            return AVERROR(ENOMEM);
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        memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
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        pkt->size = smk->buf_sizes[smk->curstream];
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        pkt->stream_index = smk->stream_id[smk->curstream];
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        pkt->pts = smk->aud_pts[smk->curstream];
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        smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
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        smk->curstream--;
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    }
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    return 0;
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}
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static int smacker_read_close(AVFormatContext *s)
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{
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    SmackerContext *smk = s->priv_data;
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    int i;
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    for(i = 0; i < 7; i++)
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        if(smk->bufs[i])
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            av_free(smk->bufs[i]);
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    if(smk->frm_size)
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        av_free(smk->frm_size);
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    if(smk->frm_flags)
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        av_free(smk->frm_flags);
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    return 0;
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}
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AVInputFormat smacker_demuxer = {
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    "smk",
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    NULL_IF_CONFIG_SMALL("Smacker video"),
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    sizeof(SmackerContext),
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    smacker_probe,
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    smacker_read_header,
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    smacker_read_packet,
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    smacker_read_close,
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};