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  1. /*
  2.  * Smacker demuxer
  3.  * Copyright (c) 2006 Konstantin Shishkov
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /*
  23.  * Based on http://wiki.multimedia.cx/index.php?title=Smacker
  24.  */
  25.  
  26. #include <inttypes.h>
  27.  
  28. #include "libavutil/bswap.h"
  29. #include "libavutil/channel_layout.h"
  30. #include "libavutil/intreadwrite.h"
  31. #include "avformat.h"
  32. #include "internal.h"
  33.  
  34. #define SMACKER_PAL 0x01
  35. #define SMACKER_FLAG_RING_FRAME 0x01
  36.  
  37. enum SAudFlags {
  38.     SMK_AUD_PACKED  = 0x80,
  39.     SMK_AUD_16BITS  = 0x20,
  40.     SMK_AUD_STEREO  = 0x10,
  41.     SMK_AUD_BINKAUD = 0x08,
  42.     SMK_AUD_USEDCT  = 0x04
  43. };
  44.  
  45. typedef struct SmackerContext {
  46.     /* Smacker file header */
  47.     uint32_t magic;
  48.     uint32_t width, height;
  49.     uint32_t frames;
  50.     int      pts_inc;
  51.     uint32_t flags;
  52.     uint32_t audio[7];
  53.     uint32_t treesize;
  54.     uint32_t mmap_size, mclr_size, full_size, type_size;
  55.     uint8_t  aflags[7];
  56.     uint32_t rates[7];
  57.     uint32_t pad;
  58.     /* frame info */
  59.     uint32_t *frm_size;
  60.     uint8_t  *frm_flags;
  61.     /* internal variables */
  62.     int cur_frame;
  63.     int is_ver4;
  64.     int64_t cur_pts;
  65.     /* current frame for demuxing */
  66.     uint8_t pal[768];
  67.     int indexes[7];
  68.     int videoindex;
  69.     uint8_t *bufs[7];
  70.     int buf_sizes[7];
  71.     int stream_id[7];
  72.     int curstream;
  73.     int64_t nextpos;
  74.     int64_t aud_pts[7];
  75. } SmackerContext;
  76.  
  77. typedef struct SmackerFrame {
  78.     int64_t pts;
  79.     int stream;
  80. } SmackerFrame;
  81.  
  82. /* palette used in Smacker */
  83. static const uint8_t smk_pal[64] = {
  84.     0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
  85.     0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
  86.     0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
  87.     0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
  88.     0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
  89.     0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
  90.     0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
  91.     0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
  92. };
  93.  
  94.  
  95. static int smacker_probe(AVProbeData *p)
  96. {
  97.     if (   AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '2')
  98.         && AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '4'))
  99.         return 0;
  100.  
  101.     if (AV_RL32(p->buf+4) > 32768U || AV_RL32(p->buf+8) > 32768U)
  102.         return AVPROBE_SCORE_MAX/4;
  103.  
  104.     return AVPROBE_SCORE_MAX;
  105. }
  106.  
  107. static int smacker_read_header(AVFormatContext *s)
  108. {
  109.     AVIOContext *pb = s->pb;
  110.     SmackerContext *smk = s->priv_data;
  111.     AVStream *st, *ast[7];
  112.     int i, ret;
  113.     int tbase;
  114.  
  115.     /* read and check header */
  116.     smk->magic = avio_rl32(pb);
  117.     if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
  118.         return AVERROR_INVALIDDATA;
  119.     smk->width = avio_rl32(pb);
  120.     smk->height = avio_rl32(pb);
  121.     smk->frames = avio_rl32(pb);
  122.     smk->pts_inc = (int32_t)avio_rl32(pb);
  123.     if (smk->pts_inc > INT_MAX / 100) {
  124.         av_log(s, AV_LOG_ERROR, "pts_inc %d is too large\n", smk->pts_inc);
  125.         return AVERROR_INVALIDDATA;
  126.     }
  127.  
  128.     smk->flags = avio_rl32(pb);
  129.     if(smk->flags & SMACKER_FLAG_RING_FRAME)
  130.         smk->frames++;
  131.     for(i = 0; i < 7; i++)
  132.         smk->audio[i] = avio_rl32(pb);
  133.     smk->treesize = avio_rl32(pb);
  134.  
  135.     if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
  136.         av_log(s, AV_LOG_ERROR, "treesize too large\n");
  137.         return AVERROR_INVALIDDATA;
  138.     }
  139.  
  140. //FIXME remove extradata "rebuilding"
  141.     smk->mmap_size = avio_rl32(pb);
  142.     smk->mclr_size = avio_rl32(pb);
  143.     smk->full_size = avio_rl32(pb);
  144.     smk->type_size = avio_rl32(pb);
  145.     for(i = 0; i < 7; i++) {
  146.         smk->rates[i]  = avio_rl24(pb);
  147.         smk->aflags[i] = avio_r8(pb);
  148.     }
  149.     smk->pad = avio_rl32(pb);
  150.     /* setup data */
  151.     if(smk->frames > 0xFFFFFF) {
  152.         av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", smk->frames);
  153.         return AVERROR_INVALIDDATA;
  154.     }
  155.     smk->frm_size = av_malloc_array(smk->frames, sizeof(*smk->frm_size));
  156.     smk->frm_flags = av_malloc(smk->frames);
  157.     if (!smk->frm_size || !smk->frm_flags) {
  158.         av_freep(&smk->frm_size);
  159.         av_freep(&smk->frm_flags);
  160.         return AVERROR(ENOMEM);
  161.     }
  162.  
  163.     smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
  164.  
  165.     /* read frame info */
  166.     for(i = 0; i < smk->frames; i++) {
  167.         smk->frm_size[i] = avio_rl32(pb);
  168.     }
  169.     for(i = 0; i < smk->frames; i++) {
  170.         smk->frm_flags[i] = avio_r8(pb);
  171.     }
  172.  
  173.     /* init video codec */
  174.     st = avformat_new_stream(s, NULL);
  175.     if (!st)
  176.         return AVERROR(ENOMEM);
  177.     smk->videoindex = st->index;
  178.     st->codec->width = smk->width;
  179.     st->codec->height = smk->height;
  180.     st->codec->pix_fmt = AV_PIX_FMT_PAL8;
  181.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  182.     st->codec->codec_id = AV_CODEC_ID_SMACKVIDEO;
  183.     st->codec->codec_tag = smk->magic;
  184.     /* Smacker uses 100000 as internal timebase */
  185.     if(smk->pts_inc < 0)
  186.         smk->pts_inc = -smk->pts_inc;
  187.     else
  188.         smk->pts_inc *= 100;
  189.     tbase = 100000;
  190.     av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
  191.     avpriv_set_pts_info(st, 33, smk->pts_inc, tbase);
  192.     st->duration = smk->frames;
  193.     /* handle possible audio streams */
  194.     for(i = 0; i < 7; i++) {
  195.         smk->indexes[i] = -1;
  196.         if (smk->rates[i]) {
  197.             ast[i] = avformat_new_stream(s, NULL);
  198.             if (!ast[i])
  199.                 return AVERROR(ENOMEM);
  200.             smk->indexes[i] = ast[i]->index;
  201.             ast[i]->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  202.             if (smk->aflags[i] & SMK_AUD_BINKAUD) {
  203.                 ast[i]->codec->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
  204.             } else if (smk->aflags[i] & SMK_AUD_USEDCT) {
  205.                 ast[i]->codec->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
  206.             } else if (smk->aflags[i] & SMK_AUD_PACKED){
  207.                 ast[i]->codec->codec_id = AV_CODEC_ID_SMACKAUDIO;
  208.                 ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
  209.             } else {
  210.                 ast[i]->codec->codec_id = AV_CODEC_ID_PCM_U8;
  211.             }
  212.             if (smk->aflags[i] & SMK_AUD_STEREO) {
  213.                 ast[i]->codec->channels       = 2;
  214.                 ast[i]->codec->channel_layout = AV_CH_LAYOUT_STEREO;
  215.             } else {
  216.                 ast[i]->codec->channels       = 1;
  217.                 ast[i]->codec->channel_layout = AV_CH_LAYOUT_MONO;
  218.             }
  219.             ast[i]->codec->sample_rate = smk->rates[i];
  220.             ast[i]->codec->bits_per_coded_sample = (smk->aflags[i] & SMK_AUD_16BITS) ? 16 : 8;
  221.             if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == AV_CODEC_ID_PCM_U8)
  222.                 ast[i]->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
  223.             avpriv_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate
  224.                     * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8);
  225.         }
  226.     }
  227.  
  228.  
  229.     /* load trees to extradata, they will be unpacked by decoder */
  230.     if(ff_alloc_extradata(st->codec, smk->treesize + 16)){
  231.         av_log(s, AV_LOG_ERROR,
  232.                "Cannot allocate %"PRIu32" bytes of extradata\n",
  233.                smk->treesize + 16);
  234.         av_freep(&smk->frm_size);
  235.         av_freep(&smk->frm_flags);
  236.         return AVERROR(ENOMEM);
  237.     }
  238.     ret = avio_read(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
  239.     if(ret != st->codec->extradata_size - 16){
  240.         av_freep(&smk->frm_size);
  241.         av_freep(&smk->frm_flags);
  242.         return AVERROR(EIO);
  243.     }
  244.     ((int32_t*)st->codec->extradata)[0] = av_le2ne32(smk->mmap_size);
  245.     ((int32_t*)st->codec->extradata)[1] = av_le2ne32(smk->mclr_size);
  246.     ((int32_t*)st->codec->extradata)[2] = av_le2ne32(smk->full_size);
  247.     ((int32_t*)st->codec->extradata)[3] = av_le2ne32(smk->type_size);
  248.  
  249.     smk->curstream = -1;
  250.     smk->nextpos = avio_tell(pb);
  251.  
  252.     return 0;
  253. }
  254.  
  255.  
  256. static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
  257. {
  258.     SmackerContext *smk = s->priv_data;
  259.     int flags;
  260.     int ret;
  261.     int i;
  262.     int frame_size = 0;
  263.     int palchange = 0;
  264.  
  265.     if (avio_feof(s->pb) || smk->cur_frame >= smk->frames)
  266.         return AVERROR_EOF;
  267.  
  268.     /* if we demuxed all streams, pass another frame */
  269.     if(smk->curstream < 0) {
  270.         avio_seek(s->pb, smk->nextpos, 0);
  271.         frame_size = smk->frm_size[smk->cur_frame] & (~3);
  272.         flags = smk->frm_flags[smk->cur_frame];
  273.         /* handle palette change event */
  274.         if(flags & SMACKER_PAL){
  275.             int size, sz, t, off, j, pos;
  276.             uint8_t *pal = smk->pal;
  277.             uint8_t oldpal[768];
  278.  
  279.             memcpy(oldpal, pal, 768);
  280.             size = avio_r8(s->pb);
  281.             size = size * 4 - 1;
  282.             if(size + 1 > frame_size)
  283.                 return AVERROR_INVALIDDATA;
  284.             frame_size -= size;
  285.             frame_size--;
  286.             sz = 0;
  287.             pos = avio_tell(s->pb) + size;
  288.             while(sz < 256){
  289.                 t = avio_r8(s->pb);
  290.                 if(t & 0x80){ /* skip palette entries */
  291.                     sz += (t & 0x7F) + 1;
  292.                     pal += ((t & 0x7F) + 1) * 3;
  293.                 } else if(t & 0x40){ /* copy with offset */
  294.                     off = avio_r8(s->pb);
  295.                     j = (t & 0x3F) + 1;
  296.                     if (off + j > 0x100) {
  297.                         av_log(s, AV_LOG_ERROR,
  298.                                "Invalid palette update, offset=%d length=%d extends beyond palette size\n",
  299.                                off, j);
  300.                         return AVERROR_INVALIDDATA;
  301.                     }
  302.                     off *= 3;
  303.                     while(j-- && sz < 256) {
  304.                         *pal++ = oldpal[off + 0];
  305.                         *pal++ = oldpal[off + 1];
  306.                         *pal++ = oldpal[off + 2];
  307.                         sz++;
  308.                         off += 3;
  309.                     }
  310.                 } else { /* new entries */
  311.                     *pal++ = smk_pal[t];
  312.                     *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
  313.                     *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
  314.                     sz++;
  315.                 }
  316.             }
  317.             avio_seek(s->pb, pos, 0);
  318.             palchange |= 1;
  319.         }
  320.         flags >>= 1;
  321.         smk->curstream = -1;
  322.         /* if audio chunks are present, put them to stack and retrieve later */
  323.         for(i = 0; i < 7; i++) {
  324.             if(flags & 1) {
  325.                 uint32_t size;
  326.                 int err;
  327.  
  328.                 size = avio_rl32(s->pb) - 4;
  329.                 if (!size || size + 4LL > frame_size) {
  330.                     av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");
  331.                     return AVERROR_INVALIDDATA;
  332.                 }
  333.                 frame_size -= size;
  334.                 frame_size -= 4;
  335.                 smk->curstream++;
  336.                 if ((err = av_reallocp(&smk->bufs[smk->curstream], size)) < 0) {
  337.                     smk->buf_sizes[smk->curstream] = 0;
  338.                     return err;
  339.                 }
  340.                 smk->buf_sizes[smk->curstream] = size;
  341.                 ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
  342.                 if(ret != size)
  343.                     return AVERROR(EIO);
  344.                 smk->stream_id[smk->curstream] = smk->indexes[i];
  345.             }
  346.             flags >>= 1;
  347.         }
  348.         if (frame_size < 0 || frame_size >= INT_MAX/2)
  349.             return AVERROR_INVALIDDATA;
  350.         if (av_new_packet(pkt, frame_size + 769))
  351.             return AVERROR(ENOMEM);
  352.         if(smk->frm_size[smk->cur_frame] & 1)
  353.             palchange |= 2;
  354.         pkt->data[0] = palchange;
  355.         memcpy(pkt->data + 1, smk->pal, 768);
  356.         ret = avio_read(s->pb, pkt->data + 769, frame_size);
  357.         if(ret != frame_size)
  358.             return AVERROR(EIO);
  359.         pkt->stream_index = smk->videoindex;
  360.         pkt->pts          = smk->cur_frame;
  361.         pkt->size = ret + 769;
  362.         smk->cur_frame++;
  363.         smk->nextpos = avio_tell(s->pb);
  364.     } else {
  365.         if (smk->stream_id[smk->curstream] < 0 || !smk->bufs[smk->curstream])
  366.             return AVERROR_INVALIDDATA;
  367.         if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
  368.             return AVERROR(ENOMEM);
  369.         memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
  370.         pkt->size = smk->buf_sizes[smk->curstream];
  371.         pkt->stream_index = smk->stream_id[smk->curstream];
  372.         pkt->pts = smk->aud_pts[smk->curstream];
  373.         smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
  374.         smk->curstream--;
  375.     }
  376.  
  377.     return 0;
  378. }
  379.  
  380. static int smacker_read_close(AVFormatContext *s)
  381. {
  382.     SmackerContext *smk = s->priv_data;
  383.     int i;
  384.  
  385.     for(i = 0; i < 7; i++)
  386.         av_freep(&smk->bufs[i]);
  387.     av_freep(&smk->frm_size);
  388.     av_freep(&smk->frm_flags);
  389.  
  390.     return 0;
  391. }
  392.  
  393. AVInputFormat ff_smacker_demuxer = {
  394.     .name           = "smk",
  395.     .long_name      = NULL_IF_CONFIG_SMALL("Smacker"),
  396.     .priv_data_size = sizeof(SmackerContext),
  397.     .read_probe     = smacker_probe,
  398.     .read_header    = smacker_read_header,
  399.     .read_packet    = smacker_read_packet,
  400.     .read_close     = smacker_read_close,
  401. };
  402.