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  1. /*
  2.  * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
  3.  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
  4.  * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. /**
  24.  * @file
  25.  * IFF file demuxer
  26.  * by Jaikrishnan Menon
  27.  * for more information on the .iff file format, visit:
  28.  * http://wiki.multimedia.cx/index.php?title=IFF
  29.  */
  30.  
  31. #include "libavutil/avassert.h"
  32. #include "libavutil/channel_layout.h"
  33. #include "libavutil/intreadwrite.h"
  34. #include "libavutil/dict.h"
  35. #include "libavcodec/bytestream.h"
  36. #include "avformat.h"
  37. #include "internal.h"
  38.  
  39. #define ID_8SVX       MKTAG('8','S','V','X')
  40. #define ID_16SV       MKTAG('1','6','S','V')
  41. #define ID_MAUD       MKTAG('M','A','U','D')
  42. #define ID_MHDR       MKTAG('M','H','D','R')
  43. #define ID_MDAT       MKTAG('M','D','A','T')
  44. #define ID_VHDR       MKTAG('V','H','D','R')
  45. #define ID_ATAK       MKTAG('A','T','A','K')
  46. #define ID_RLSE       MKTAG('R','L','S','E')
  47. #define ID_CHAN       MKTAG('C','H','A','N')
  48. #define ID_PBM        MKTAG('P','B','M',' ')
  49. #define ID_ILBM       MKTAG('I','L','B','M')
  50. #define ID_BMHD       MKTAG('B','M','H','D')
  51. #define ID_DGBL       MKTAG('D','G','B','L')
  52. #define ID_CAMG       MKTAG('C','A','M','G')
  53. #define ID_CMAP       MKTAG('C','M','A','P')
  54. #define ID_ACBM       MKTAG('A','C','B','M')
  55. #define ID_DEEP       MKTAG('D','E','E','P')
  56. #define ID_RGB8       MKTAG('R','G','B','8')
  57. #define ID_RGBN       MKTAG('R','G','B','N')
  58.  
  59. #define ID_FORM       MKTAG('F','O','R','M')
  60. #define ID_ANNO       MKTAG('A','N','N','O')
  61. #define ID_AUTH       MKTAG('A','U','T','H')
  62. #define ID_CHRS       MKTAG('C','H','R','S')
  63. #define ID_COPYRIGHT  MKTAG('(','c',')',' ')
  64. #define ID_CSET       MKTAG('C','S','E','T')
  65. #define ID_FVER       MKTAG('F','V','E','R')
  66. #define ID_NAME       MKTAG('N','A','M','E')
  67. #define ID_TEXT       MKTAG('T','E','X','T')
  68. #define ID_ABIT       MKTAG('A','B','I','T')
  69. #define ID_BODY       MKTAG('B','O','D','Y')
  70. #define ID_DBOD       MKTAG('D','B','O','D')
  71. #define ID_DPEL       MKTAG('D','P','E','L')
  72. #define ID_DLOC       MKTAG('D','L','O','C')
  73. #define ID_TVDC       MKTAG('T','V','D','C')
  74.  
  75. #define LEFT    2
  76. #define RIGHT   4
  77. #define STEREO  6
  78.  
  79. /**
  80.  * This number of bytes if added at the beginning of each AVPacket
  81.  * which contain additional information about video properties
  82.  * which has to be shared between demuxer and decoder.
  83.  * This number may change between frames, e.g. the demuxer might
  84.  * set it to smallest possible size of 2 to indicate that there's
  85.  * no extradata changing in this frame.
  86.  */
  87. #define IFF_EXTRA_VIDEO_SIZE 41
  88.  
  89. typedef enum {
  90.     COMP_NONE,
  91.     COMP_FIB,
  92.     COMP_EXP
  93. } svx8_compression_type;
  94.  
  95. typedef struct {
  96.     int64_t  body_pos;
  97.     int64_t  body_end;
  98.     uint32_t  body_size;
  99.     svx8_compression_type   svx8_compression;
  100.     unsigned  maud_bits;
  101.     unsigned  maud_compression;
  102.     unsigned  bitmap_compression;  ///< delta compression method used
  103.     unsigned  bpp;          ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
  104.     unsigned  ham;          ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
  105.     unsigned  flags;        ///< 1 for EHB, 0 is no extra half darkening
  106.     unsigned  transparency; ///< transparency color index in palette
  107.     unsigned  masking;      ///< masking method used
  108.     uint8_t   tvdc[32];     ///< TVDC lookup table
  109. } IffDemuxContext;
  110.  
  111. /* Metadata string read */
  112. static int get_metadata(AVFormatContext *s,
  113.                         const char *const tag,
  114.                         const unsigned data_size)
  115. {
  116.     uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
  117.  
  118.     if (!buf)
  119.         return AVERROR(ENOMEM);
  120.  
  121.     if (avio_read(s->pb, buf, data_size) < 0) {
  122.         av_free(buf);
  123.         return AVERROR(EIO);
  124.     }
  125.     buf[data_size] = 0;
  126.     av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
  127.     return 0;
  128. }
  129.  
  130. static int iff_probe(AVProbeData *p)
  131. {
  132.     const uint8_t *d = p->buf;
  133.  
  134.     if (  AV_RL32(d)   == ID_FORM &&
  135.          (AV_RL32(d+8) == ID_8SVX ||
  136.           AV_RL32(d+8) == ID_16SV ||
  137.           AV_RL32(d+8) == ID_MAUD ||
  138.           AV_RL32(d+8) == ID_PBM  ||
  139.           AV_RL32(d+8) == ID_ACBM ||
  140.           AV_RL32(d+8) == ID_DEEP ||
  141.           AV_RL32(d+8) == ID_ILBM ||
  142.           AV_RL32(d+8) == ID_RGB8 ||
  143.           AV_RL32(d+8) == ID_RGBN) )
  144.         return AVPROBE_SCORE_MAX;
  145.     return 0;
  146. }
  147.  
  148. static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
  149. static const uint8_t deep_rgba[]  = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
  150. static const uint8_t deep_bgra[]  = {0, 0, 0, 4, 0, 3, 0, 8, 0, 2, 0, 8, 0, 1, 0, 8};
  151. static const uint8_t deep_argb[]  = {0, 0, 0, 4, 0,17, 0, 8, 0, 1, 0, 8, 0, 2, 0, 8};
  152. static const uint8_t deep_abgr[]  = {0, 0, 0, 4, 0,17, 0, 8, 0, 3, 0, 8, 0, 2, 0, 8};
  153.  
  154. static int iff_read_header(AVFormatContext *s)
  155. {
  156.     IffDemuxContext *iff = s->priv_data;
  157.     AVIOContext *pb = s->pb;
  158.     AVStream *st;
  159.     uint8_t *buf;
  160.     uint32_t chunk_id, data_size;
  161.     uint32_t screenmode = 0, num, den;
  162.     unsigned transparency = 0;
  163.     unsigned masking = 0; // no mask
  164.     uint8_t fmt[16];
  165.     int fmt_size;
  166.  
  167.     st = avformat_new_stream(s, NULL);
  168.     if (!st)
  169.         return AVERROR(ENOMEM);
  170.  
  171.     st->codec->channels = 1;
  172.     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
  173.     avio_skip(pb, 8);
  174.     // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
  175.     st->codec->codec_tag = avio_rl32(pb);
  176.     iff->bitmap_compression = -1;
  177.     iff->svx8_compression = -1;
  178.     iff->maud_bits = -1;
  179.     iff->maud_compression = -1;
  180.  
  181.     while(!url_feof(pb)) {
  182.         uint64_t orig_pos;
  183.         int res;
  184.         const char *metadata_tag = NULL;
  185.         chunk_id = avio_rl32(pb);
  186.         data_size = avio_rb32(pb);
  187.         orig_pos = avio_tell(pb);
  188.  
  189.         switch(chunk_id) {
  190.         case ID_VHDR:
  191.             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  192.  
  193.             if (data_size < 14)
  194.                 return AVERROR_INVALIDDATA;
  195.             avio_skip(pb, 12);
  196.             st->codec->sample_rate = avio_rb16(pb);
  197.             if (data_size >= 16) {
  198.                 avio_skip(pb, 1);
  199.                 iff->svx8_compression = avio_r8(pb);
  200.             }
  201.             break;
  202.  
  203.         case ID_MHDR:
  204.             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  205.  
  206.             if (data_size < 32)
  207.                 return AVERROR_INVALIDDATA;
  208.             avio_skip(pb, 4);
  209.             iff->maud_bits = avio_rb16(pb);
  210.             avio_skip(pb, 2);
  211.             num = avio_rb32(pb);
  212.             den = avio_rb16(pb);
  213.             if (!den)
  214.                 return AVERROR_INVALIDDATA;
  215.             avio_skip(pb, 2);
  216.             st->codec->sample_rate = num / den;
  217.             st->codec->channels = avio_rb16(pb);
  218.             iff->maud_compression = avio_rb16(pb);
  219.             if (st->codec->channels == 1)
  220.                 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
  221.             else if (st->codec->channels == 2)
  222.                 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
  223.             break;
  224.  
  225.         case ID_ABIT:
  226.         case ID_BODY:
  227.         case ID_DBOD:
  228.         case ID_MDAT:
  229.             iff->body_pos = avio_tell(pb);
  230.             iff->body_end = iff->body_pos + data_size;
  231.             iff->body_size = data_size;
  232.             break;
  233.  
  234.         case ID_CHAN:
  235.             if (data_size < 4)
  236.                 return AVERROR_INVALIDDATA;
  237.             if (avio_rb32(pb) < 6) {
  238.                 st->codec->channels       = 1;
  239.                 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
  240.             } else {
  241.                 st->codec->channels       = 2;
  242.                 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
  243.             }
  244.             break;
  245.  
  246.         case ID_CAMG:
  247.             if (data_size < 4)
  248.                 return AVERROR_INVALIDDATA;
  249.             screenmode                = avio_rb32(pb);
  250.             break;
  251.  
  252.         case ID_CMAP:
  253.             if (data_size < 3 || data_size > 768 || data_size % 3) {
  254.                  av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %d\n",
  255.                         data_size);
  256.                  return AVERROR_INVALIDDATA;
  257.             }
  258.             st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
  259.             st->codec->extradata      = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
  260.             if (!st->codec->extradata)
  261.                 return AVERROR(ENOMEM);
  262.             if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)
  263.                 return AVERROR(EIO);
  264.             break;
  265.  
  266.         case ID_BMHD:
  267.             st->codec->codec_type            = AVMEDIA_TYPE_VIDEO;
  268.             if (data_size <= 8)
  269.                 return AVERROR_INVALIDDATA;
  270.             st->codec->width                 = avio_rb16(pb);
  271.             st->codec->height                = avio_rb16(pb);
  272.             avio_skip(pb, 4); // x, y offset
  273.             st->codec->bits_per_coded_sample = avio_r8(pb);
  274.             if (data_size >= 10)
  275.                 masking                      = avio_r8(pb);
  276.             if (data_size >= 11)
  277.                 iff->bitmap_compression      = avio_r8(pb);
  278.             if (data_size >= 14) {
  279.                 avio_skip(pb, 1); // padding
  280.                 transparency                 = avio_rb16(pb);
  281.             }
  282.             if (data_size >= 16) {
  283.                 st->sample_aspect_ratio.num  = avio_r8(pb);
  284.                 st->sample_aspect_ratio.den  = avio_r8(pb);
  285.             }
  286.             break;
  287.  
  288.         case ID_DPEL:
  289.             if (data_size < 4 || (data_size & 3))
  290.                 return AVERROR_INVALIDDATA;
  291.             if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)
  292.                 return fmt_size;
  293.             if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))
  294.                 st->codec->pix_fmt = AV_PIX_FMT_RGB24;
  295.             else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))
  296.                 st->codec->pix_fmt = AV_PIX_FMT_RGBA;
  297.             else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))
  298.                 st->codec->pix_fmt = AV_PIX_FMT_BGRA;
  299.             else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))
  300.                 st->codec->pix_fmt = AV_PIX_FMT_ARGB;
  301.             else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))
  302.                 st->codec->pix_fmt = AV_PIX_FMT_ABGR;
  303.             else {
  304.                 avpriv_request_sample(s, "color format %.16s", fmt);
  305.                 return AVERROR_PATCHWELCOME;
  306.             }
  307.             break;
  308.  
  309.         case ID_DGBL:
  310.             st->codec->codec_type            = AVMEDIA_TYPE_VIDEO;
  311.             if (data_size < 8)
  312.                 return AVERROR_INVALIDDATA;
  313.             st->codec->width                 = avio_rb16(pb);
  314.             st->codec->height                = avio_rb16(pb);
  315.             iff->bitmap_compression          = avio_rb16(pb);
  316.             st->sample_aspect_ratio.num      = avio_r8(pb);
  317.             st->sample_aspect_ratio.den      = avio_r8(pb);
  318.             st->codec->bits_per_coded_sample = 24;
  319.             break;
  320.  
  321.         case ID_DLOC:
  322.             if (data_size < 4)
  323.                 return AVERROR_INVALIDDATA;
  324.             st->codec->width  = avio_rb16(pb);
  325.             st->codec->height = avio_rb16(pb);
  326.             break;
  327.  
  328.         case ID_TVDC:
  329.             if (data_size < sizeof(iff->tvdc))
  330.                 return AVERROR_INVALIDDATA;
  331.             res = avio_read(pb, iff->tvdc, sizeof(iff->tvdc));
  332.             if (res < 0)
  333.                 return res;
  334.             break;
  335.  
  336.         case ID_ANNO:
  337.         case ID_TEXT:      metadata_tag = "comment";   break;
  338.         case ID_AUTH:      metadata_tag = "artist";    break;
  339.         case ID_COPYRIGHT: metadata_tag = "copyright"; break;
  340.         case ID_NAME:      metadata_tag = "title";     break;
  341.         }
  342.  
  343.         if (metadata_tag) {
  344.             if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
  345.                 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
  346.                 return res;
  347.             }
  348.         }
  349.         avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
  350.     }
  351.  
  352.     avio_seek(pb, iff->body_pos, SEEK_SET);
  353.  
  354.     switch(st->codec->codec_type) {
  355.     case AVMEDIA_TYPE_AUDIO:
  356.         avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
  357.  
  358.         if (st->codec->codec_tag == ID_16SV)
  359.             st->codec->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;
  360.         else if (st->codec->codec_tag == ID_MAUD) {
  361.             if (iff->maud_bits == 8 && !iff->maud_compression) {
  362.                 st->codec->codec_id = AV_CODEC_ID_PCM_U8;
  363.             } else if (iff->maud_bits == 16 && !iff->maud_compression) {
  364.                 st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
  365.             } else if (iff->maud_bits ==  8 && iff->maud_compression == 2) {
  366.                 st->codec->codec_id = AV_CODEC_ID_PCM_ALAW;
  367.             } else if (iff->maud_bits ==  8 && iff->maud_compression == 3) {
  368.                 st->codec->codec_id = AV_CODEC_ID_PCM_MULAW;
  369.             } else {
  370.                 avpriv_request_sample(s, "compression %d and bit depth %d", iff->maud_compression, iff->maud_bits);
  371.                 return AVERROR_PATCHWELCOME;
  372.             }
  373.  
  374.             st->codec->bits_per_coded_sample =
  375.                 av_get_bits_per_sample(st->codec->codec_id);
  376.  
  377.             st->codec->block_align =
  378.                 st->codec->bits_per_coded_sample * st->codec->channels / 8;
  379.         } else {
  380.         switch (iff->svx8_compression) {
  381.         case COMP_NONE:
  382.             st->codec->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;
  383.             break;
  384.         case COMP_FIB:
  385.             st->codec->codec_id = AV_CODEC_ID_8SVX_FIB;
  386.             break;
  387.         case COMP_EXP:
  388.             st->codec->codec_id = AV_CODEC_ID_8SVX_EXP;
  389.             break;
  390.         default:
  391.             av_log(s, AV_LOG_ERROR,
  392.                    "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
  393.             return -1;
  394.         }
  395.         }
  396.  
  397.         st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
  398.         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
  399.         st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
  400.         break;
  401.  
  402.     case AVMEDIA_TYPE_VIDEO:
  403.         iff->bpp          = st->codec->bits_per_coded_sample;
  404.         if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
  405.             iff->ham      = iff->bpp > 6 ? 6 : 4;
  406.             st->codec->bits_per_coded_sample = 24;
  407.         }
  408.         iff->flags        = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
  409.         iff->masking      = masking;
  410.         iff->transparency = transparency;
  411.  
  412.         if (!st->codec->extradata) {
  413.             st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;
  414.             st->codec->extradata      = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
  415.             if (!st->codec->extradata)
  416.                 return AVERROR(ENOMEM);
  417.         }
  418.         av_assert0(st->codec->extradata_size >= IFF_EXTRA_VIDEO_SIZE);
  419.         buf = st->codec->extradata;
  420.         bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
  421.         bytestream_put_byte(&buf, iff->bitmap_compression);
  422.         bytestream_put_byte(&buf, iff->bpp);
  423.         bytestream_put_byte(&buf, iff->ham);
  424.         bytestream_put_byte(&buf, iff->flags);
  425.         bytestream_put_be16(&buf, iff->transparency);
  426.         bytestream_put_byte(&buf, iff->masking);
  427.         bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));
  428.         st->codec->codec_id = AV_CODEC_ID_IFF_ILBM;
  429.         break;
  430.     default:
  431.         return -1;
  432.     }
  433.  
  434.     return 0;
  435. }
  436.  
  437. static int iff_read_packet(AVFormatContext *s,
  438.                            AVPacket *pkt)
  439. {
  440.     IffDemuxContext *iff = s->priv_data;
  441.     AVIOContext *pb = s->pb;
  442.     AVStream *st = s->streams[0];
  443.     int ret;
  444.     int64_t pos = avio_tell(pb);
  445.  
  446.     if (pos >= iff->body_end)
  447.         return AVERROR_EOF;
  448.  
  449.     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
  450.         if (st->codec->codec_tag == ID_MAUD) {
  451.             ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * st->codec->block_align));
  452.         } else {
  453.             ret = av_get_packet(pb, pkt, iff->body_size);
  454.         }
  455.     } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
  456.         uint8_t *buf;
  457.  
  458.         if (av_new_packet(pkt, iff->body_size + 2) < 0) {
  459.             return AVERROR(ENOMEM);
  460.         }
  461.  
  462.         buf = pkt->data;
  463.         bytestream_put_be16(&buf, 2);
  464.         ret = avio_read(pb, buf, iff->body_size);
  465.     } else {
  466.         av_assert0(0);
  467.     }
  468.  
  469.     if (pos == iff->body_pos)
  470.         pkt->flags |= AV_PKT_FLAG_KEY;
  471.     if (ret < 0)
  472.         return ret;
  473.     pkt->stream_index = 0;
  474.     return ret;
  475. }
  476.  
  477. AVInputFormat ff_iff_demuxer = {
  478.     .name           = "iff",
  479.     .long_name      = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),
  480.     .priv_data_size = sizeof(IffDemuxContext),
  481.     .read_probe     = iff_probe,
  482.     .read_header    = iff_read_header,
  483.     .read_packet    = iff_read_packet,
  484.     .flags          = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
  485. };
  486.