Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

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