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FFmpeg/libavformat/iff.c

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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 <inttypes.h>

  32. 

  33. #include "libavutil/avassert.h"

  34. #include "libavutil/channel_layout.h"

  35. #include "libavutil/intreadwrite.h"

  36. #include "libavutil/dict.h"

  37. #include "libavcodec/bytestream.h"

  38. #include "avformat.h"

  39. #include "id3v2.h"

  40. #include "internal.h"

  41. 

  42. #define ID_8SVX       MKTAG('8','S','V','X')

  43. #define ID_16SV       MKTAG('1','6','S','V')

  44. #define ID_MAUD       MKTAG('M','A','U','D')

  45. #define ID_MHDR       MKTAG('M','H','D','R')

  46. #define ID_MDAT       MKTAG('M','D','A','T')

  47. #define ID_VHDR       MKTAG('V','H','D','R')

  48. #define ID_ATAK       MKTAG('A','T','A','K')

  49. #define ID_RLSE       MKTAG('R','L','S','E')

  50. #define ID_CHAN       MKTAG('C','H','A','N')

  51. #define ID_PBM        MKTAG('P','B','M',' ')

  52. #define ID_ILBM       MKTAG('I','L','B','M')

  53. #define ID_BMHD       MKTAG('B','M','H','D')

  54. #define ID_DGBL       MKTAG('D','G','B','L')

  55. #define ID_CAMG       MKTAG('C','A','M','G')

  56. #define ID_CMAP       MKTAG('C','M','A','P')

  57. #define ID_ACBM       MKTAG('A','C','B','M')

  58. #define ID_DEEP       MKTAG('D','E','E','P')

  59. #define ID_RGB8       MKTAG('R','G','B','8')

  60. #define ID_RGBN       MKTAG('R','G','B','N')

  61. #define ID_DSD        MKTAG('D','S','D',' ')

  62. 

  63. #define ID_FORM       MKTAG('F','O','R','M')

  64. #define ID_FRM8       MKTAG('F','R','M','8')

  65. #define ID_ANNO       MKTAG('A','N','N','O')

  66. #define ID_AUTH       MKTAG('A','U','T','H')

  67. #define ID_CHRS       MKTAG('C','H','R','S')

  68. #define ID_COPYRIGHT  MKTAG('(','c',')',' ')

  69. #define ID_CSET       MKTAG('C','S','E','T')

  70. #define ID_FVER       MKTAG('F','V','E','R')

  71. #define ID_NAME       MKTAG('N','A','M','E')

  72. #define ID_TEXT       MKTAG('T','E','X','T')

  73. #define ID_ABIT       MKTAG('A','B','I','T')

  74. #define ID_BODY       MKTAG('B','O','D','Y')

  75. #define ID_DBOD       MKTAG('D','B','O','D')

  76. #define ID_DPEL       MKTAG('D','P','E','L')

  77. #define ID_DLOC       MKTAG('D','L','O','C')

  78. #define ID_TVDC       MKTAG('T','V','D','C')

  79. 

  80. #define LEFT    2

  81. #define RIGHT   4

  82. #define STEREO  6

  83. 

  84. /**

  85.  * This number of bytes if added at the beginning of each AVPacket

  86.  * which contain additional information about video properties

  87.  * which has to be shared between demuxer and decoder.

  88.  * This number may change between frames, e.g. the demuxer might

  89.  * set it to smallest possible size of 2 to indicate that there's

  90.  * no extradata changing in this frame.

  91.  */

  92. #define IFF_EXTRA_VIDEO_SIZE 41

  93. 

  94. typedef enum {

  95.     COMP_NONE,

  96.     COMP_FIB,

  97.     COMP_EXP

  98. } svx8_compression_type;

  99. 

  100. typedef struct {

  101.     int      is_64bit;  ///< chunk size is 64-bit

  102.     int64_t  body_pos;

  103.     int64_t  body_end;

  104.     uint32_t  body_size;

  105.     svx8_compression_type   svx8_compression;

  106.     unsigned  maud_bits;

  107.     unsigned  maud_compression;

  108.     unsigned  bitmap_compression;  ///< delta compression method used

  109.     unsigned  bpp;          ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)

  110.     unsigned  ham;          ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)

  111.     unsigned  flags;        ///< 1 for EHB, 0 is no extra half darkening

  112.     unsigned  transparency; ///< transparency color index in palette

  113.     unsigned  masking;      ///< masking method used

  114.     uint8_t   tvdc[32];     ///< TVDC lookup table

  115. } IffDemuxContext;

  116. 

  117. /* Metadata string read */

  118. static int get_metadata(AVFormatContext *s,

  119.                         const char *const tag,

  120.                         const unsigned data_size)

  121. {

  122.     uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);

  123. 

  124.     if (!buf)

  125.         return AVERROR(ENOMEM);

  126. 

  127.     if (avio_read(s->pb, buf, data_size) != data_size) {

  128.         av_free(buf);

  129.         return AVERROR(EIO);

  130.     }

  131.     buf[data_size] = 0;

  132.     av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);

  133.     return 0;

  134. }

  135. 

  136. static int iff_probe(AVProbeData *p)

  137. {

  138.     const uint8_t *d = p->buf;

  139. 

  140.     if ( (AV_RL32(d)   == ID_FORM &&

  141.          (AV_RL32(d+8) == ID_8SVX ||

  142.           AV_RL32(d+8) == ID_16SV ||

  143.           AV_RL32(d+8) == ID_MAUD ||

  144.           AV_RL32(d+8) == ID_PBM  ||

  145.           AV_RL32(d+8) == ID_ACBM ||

  146.           AV_RL32(d+8) == ID_DEEP ||

  147.           AV_RL32(d+8) == ID_ILBM ||

  148.           AV_RL32(d+8) == ID_RGB8 ||

  149.           AV_RL32(d+8) == ID_RGB8 ||

  150.           AV_RL32(d+8) == ID_RGBN)) ||

  151.          (AV_RL32(d) == ID_FRM8 && AV_RL32(d+12) == ID_DSD))

  152.         return AVPROBE_SCORE_MAX;

  153.     return 0;

  154. }

  155. 

  156. static const AVCodecTag dsd_codec_tags[] = {

  157.     { AV_CODEC_ID_DSD_MSBF, ID_DSD },

  158.     { AV_CODEC_ID_NONE, 0 },

  159. };

  160. 

  161. 

  162. #define DSD_SLFT MKTAG('S','L','F','T')

  163. #define DSD_SRGT MKTAG('S','R','G','T')

  164. #define DSD_MLFT MKTAG('M','L','F','T')

  165. #define DSD_MRGT MKTAG('M','R','G','T')

  166. #define DSD_C    MKTAG('C',' ',' ',' ')

  167. #define DSD_LS   MKTAG('L','S',' ',' ')

  168. #define DSD_RS   MKTAG('R','S',' ',' ')

  169. #define DSD_LFE  MKTAG('L','F','E',' ')

  170. 

  171. static const uint32_t dsd_stereo[]  = { DSD_SLFT, DSD_SRGT };

  172. static const uint32_t dsd_5point0[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LS, DSD_RS };

  173. static const uint32_t dsd_5point1[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LFE, DSD_LS, DSD_RS };

  174. 

  175. typedef struct {

  176.     uint64_t layout;

  177.     const uint32_t * dsd_layout;

  178. } DSDLayoutDesc;

  179. 

  180. static const DSDLayoutDesc dsd_channel_layout[] = {

  181.     { AV_CH_LAYOUT_STEREO,  dsd_stereo },

  182.     { AV_CH_LAYOUT_5POINT0, dsd_5point0 },

  183.     { AV_CH_LAYOUT_5POINT1, dsd_5point1 },

  184. };

  185. 

  186. static const uint64_t dsd_loudspeaker_config[] = {

  187.     AV_CH_LAYOUT_STEREO,

  188.     0, 0,

  189.     AV_CH_LAYOUT_5POINT0, AV_CH_LAYOUT_5POINT1,

  190. };

  191. 

  192. static const char * dsd_source_comment[] = {

  193.     "dsd_source_comment",

  194.     "analogue_source_comment",

  195.     "pcm_source_comment",

  196. };

  197. 

  198. static const char * dsd_history_comment[] = {

  199.     "general_remark",

  200.     "operator_name",

  201.     "creating_machine",

  202.     "timezone",

  203.     "file_revision"

  204. };

  205. 

  206. static int parse_dsd_diin(AVFormatContext *s, AVStream *st, uint64_t eof)

  207. {

  208.     AVIOContext *pb = s->pb;

  209. 

  210.     while (avio_tell(pb) + 12 <= eof) {

  211.         uint32_t tag      = avio_rl32(pb);

  212.         uint64_t size     = avio_rb64(pb);

  213.         uint64_t orig_pos = avio_tell(pb);

  214.         const char * metadata_tag = NULL;

  215. 

  216.         switch(tag) {

  217.         case MKTAG('D','I','A','R'): metadata_tag = "artist"; break;

  218.         case MKTAG('D','I','T','I'): metadata_tag = "title";  break;

  219.         }

  220. 

  221.         if (metadata_tag && size > 4) {

  222.             unsigned int tag_size = avio_rb32(pb);

  223.             int ret = get_metadata(s, metadata_tag, FFMIN(tag_size, size - 4));

  224.             if (ret < 0) {

  225.                 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);

  226.                 return ret;

  227.             }

  228.         }

  229. 

  230.         avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));

  231.     }

  232. 

  233.     return 0;

  234. }

  235. 

  236. static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)

  237. {

  238.     AVIOContext *pb = s->pb;

  239.     char abss[24];

  240.     int hour, min, sec, i, ret, config;

  241.     int dsd_layout[6];

  242.     ID3v2ExtraMeta *id3v2_extra_meta;

  243. 

  244.     while (avio_tell(pb) + 12 <= eof) {

  245.         uint32_t tag      = avio_rl32(pb);

  246.         uint64_t size     = avio_rb64(pb);

  247.         uint64_t orig_pos = avio_tell(pb);

  248. 

  249.         switch(tag) {

  250.         case MKTAG('A','B','S','S'):

  251.             if (size < 8)

  252.                 return AVERROR_INVALIDDATA;

  253.             hour = avio_rb16(pb);

  254.             min  = avio_r8(pb);

  255.             sec  = avio_r8(pb);

  256.             snprintf(abss, sizeof(abss), "%02dh:%02dm:%02ds:%d", hour, min, sec, avio_rb32(pb));

  257.             av_dict_set(&st->metadata, "absolute_start_time", abss, 0);

  258.             break;

  259. 

  260.         case MKTAG('C','H','N','L'):

  261.             if (size < 2)

  262.                 return AVERROR_INVALIDDATA;

  263.             st->codec->channels       = avio_rb16(pb);

  264.             if (size < 2 + st->codec->channels * 4)

  265.                 return AVERROR_INVALIDDATA;

  266.             st->codec->channel_layout = 0;

  267.             if (st->codec->channels > FF_ARRAY_ELEMS(dsd_layout)) {

  268.                 avpriv_request_sample(s, "channel layout");

  269.                 break;

  270.             }

  271.             for (i = 0; i < st->codec->channels; i++)

  272.                 dsd_layout[i] = avio_rl32(pb);

  273.             for (i = 0; i < FF_ARRAY_ELEMS(dsd_channel_layout); i++) {

  274.                 const DSDLayoutDesc * d = &dsd_channel_layout[i];

  275.                 if (av_get_channel_layout_nb_channels(d->layout) == st->codec->channels &&

  276.                     !memcmp(d->dsd_layout, dsd_layout, st->codec->channels * sizeof(uint32_t))) {

  277.                     st->codec->channel_layout = d->layout;

  278.                     break;

  279.                 }

  280.             }

  281.             break;

  282. 

  283.         case MKTAG('C','M','P','R'):

  284.             if (size < 4)

  285.                 return AVERROR_INVALIDDATA;

  286.             st->codec->codec_id = ff_codec_get_id(dsd_codec_tags, avio_rl32(pb));

  287.             break;

  288. 

  289.         case MKTAG('F','S',' ',' '):

  290.             if (size < 4)

  291.                 return AVERROR_INVALIDDATA;

  292.             st->codec->sample_rate = avio_rb32(pb) / 8;

  293.             break;

  294. 

  295.         case MKTAG('I','D','3',' '):

  296.             id3v2_extra_meta = NULL;

  297.             ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);

  298.             if (id3v2_extra_meta) {

  299.                 if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {

  300.                     ff_id3v2_free_extra_meta(&id3v2_extra_meta);

  301.                     return ret;

  302.                 }

  303.                 ff_id3v2_free_extra_meta(&id3v2_extra_meta);

  304.             }

  305. 

  306.             if (size < avio_tell(pb) - orig_pos) {

  307.                 av_log(s, AV_LOG_ERROR, "id3 exceeds chunk size\n");

  308.                 return AVERROR_INVALIDDATA;

  309.             }

  310.             break;

  311. 

  312.         case MKTAG('L','S','C','O'):

  313.             if (size < 2)

  314.                 return AVERROR_INVALIDDATA;

  315.             config = avio_rb16(pb);

  316.             if (config != 0xFFFF) {

  317.                 if (config < FF_ARRAY_ELEMS(dsd_loudspeaker_config))

  318.                     st->codec->channel_layout = dsd_loudspeaker_config[config];

  319.                 if (!st->codec->channel_layout)

  320.                     avpriv_request_sample(s, "loudspeaker configuration %d", config);

  321.             }

  322.             break;

  323.         }

  324. 

  325.         avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));

  326.     }

  327. 

  328.     return 0;

  329. }

  330. 

  331. static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};

  332. static const uint8_t deep_rgba[]  = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};

  333. static const uint8_t deep_bgra[]  = {0, 0, 0, 4, 0, 3, 0, 8, 0, 2, 0, 8, 0, 1, 0, 8};

  334. static const uint8_t deep_argb[]  = {0, 0, 0, 4, 0,17, 0, 8, 0, 1, 0, 8, 0, 2, 0, 8};

  335. static const uint8_t deep_abgr[]  = {0, 0, 0, 4, 0,17, 0, 8, 0, 3, 0, 8, 0, 2, 0, 8};

  336. 

  337. static int iff_read_header(AVFormatContext *s)

  338. {

  339.     IffDemuxContext *iff = s->priv_data;

  340.     AVIOContext *pb = s->pb;

  341.     AVStream *st;

  342.     uint8_t *buf;

  343.     uint32_t chunk_id;

  344.     uint64_t data_size;

  345.     uint32_t screenmode = 0, num, den;

  346.     unsigned transparency = 0;

  347.     unsigned masking = 0; // no mask

  348.     uint8_t fmt[16];

  349.     int fmt_size;

  350. 

  351.     st = avformat_new_stream(s, NULL);

  352.     if (!st)

  353.         return AVERROR(ENOMEM);

  354. 

  355.     st->codec->channels = 1;

  356.     st->codec->channel_layout = AV_CH_LAYOUT_MONO;

  357.     iff->is_64bit = avio_rl32(pb) == ID_FRM8;

  358.     avio_skip(pb, iff->is_64bit ? 8 : 4);

  359.     // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content

  360.     st->codec->codec_tag = avio_rl32(pb);

  361.     iff->bitmap_compression = -1;

  362.     iff->svx8_compression = -1;

  363.     iff->maud_bits = -1;

  364.     iff->maud_compression = -1;

  365. 

  366.     while(!url_feof(pb)) {

  367.         uint64_t orig_pos;

  368.         int res;

  369.         const char *metadata_tag = NULL;

  370.         int version, nb_comments, i;

  371.         chunk_id = avio_rl32(pb);

  372.         data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);

  373.         orig_pos = avio_tell(pb);

  374. 

  375.         switch(chunk_id) {

  376.         case ID_VHDR:

  377.             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  378. 

  379.             if (data_size < 14)

  380.                 return AVERROR_INVALIDDATA;

  381.             avio_skip(pb, 12);

  382.             st->codec->sample_rate = avio_rb16(pb);

  383.             if (data_size >= 16) {

  384.                 avio_skip(pb, 1);

  385.                 iff->svx8_compression = avio_r8(pb);

  386.             }

  387.             break;

  388. 

  389.         case ID_MHDR:

  390.             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  391. 

  392.             if (data_size < 32)

  393.                 return AVERROR_INVALIDDATA;

  394.             avio_skip(pb, 4);

  395.             iff->maud_bits = avio_rb16(pb);

  396.             avio_skip(pb, 2);

  397.             num = avio_rb32(pb);

  398.             den = avio_rb16(pb);

  399.             if (!den)

  400.                 return AVERROR_INVALIDDATA;

  401.             avio_skip(pb, 2);

  402.             st->codec->sample_rate = num / den;

  403.             st->codec->channels = avio_rb16(pb);

  404.             iff->maud_compression = avio_rb16(pb);

  405.             if (st->codec->channels == 1)

  406.                 st->codec->channel_layout = AV_CH_LAYOUT_MONO;

  407.             else if (st->codec->channels == 2)

  408.                 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;

  409.             break;

  410. 

  411.         case ID_ABIT:

  412.         case ID_BODY:

  413.         case ID_DBOD:

  414.         case ID_DSD:

  415.         case ID_MDAT:

  416.             iff->body_pos = avio_tell(pb);

  417.             iff->body_end = iff->body_pos + data_size;

  418.             iff->body_size = data_size;

  419.             break;

  420. 

  421.         case ID_CHAN:

  422.             if (data_size < 4)

  423.                 return AVERROR_INVALIDDATA;

  424.             if (avio_rb32(pb) < 6) {

  425.                 st->codec->channels       = 1;

  426.                 st->codec->channel_layout = AV_CH_LAYOUT_MONO;

  427.             } else {

  428.                 st->codec->channels       = 2;

  429.                 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;

  430.             }

  431.             break;

  432. 

  433.         case ID_CAMG:

  434.             if (data_size < 4)

  435.                 return AVERROR_INVALIDDATA;

  436.             screenmode                = avio_rb32(pb);

  437.             break;

  438. 

  439.         case ID_CMAP:

  440.             if (data_size < 3 || data_size > 768 || data_size % 3) {

  441.                  av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %"PRIu64"\n",

  442.                         data_size);

  443.                  return AVERROR_INVALIDDATA;

  444.             }

  445.             st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;

  446.             st->codec->extradata      = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);

  447.             if (!st->codec->extradata)

  448.                 return AVERROR(ENOMEM);

  449.             if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)

  450.                 return AVERROR(EIO);

  451.             break;

  452. 

  453.         case ID_BMHD:

  454.             st->codec->codec_type            = AVMEDIA_TYPE_VIDEO;

  455.             if (data_size <= 8)

  456.                 return AVERROR_INVALIDDATA;

  457.             st->codec->width                 = avio_rb16(pb);

  458.             st->codec->height                = avio_rb16(pb);

  459.             avio_skip(pb, 4); // x, y offset

  460.             st->codec->bits_per_coded_sample = avio_r8(pb);

  461.             if (data_size >= 10)

  462.                 masking                      = avio_r8(pb);

  463.             if (data_size >= 11)

  464.                 iff->bitmap_compression      = avio_r8(pb);

  465.             if (data_size >= 14) {

  466.                 avio_skip(pb, 1); // padding

  467.                 transparency                 = avio_rb16(pb);

  468.             }

  469.             if (data_size >= 16) {

  470.                 st->sample_aspect_ratio.num  = avio_r8(pb);

  471.                 st->sample_aspect_ratio.den  = avio_r8(pb);

  472.             }

  473.             break;

  474. 

  475.         case ID_DPEL:

  476.             if (data_size < 4 || (data_size & 3))

  477.                 return AVERROR_INVALIDDATA;

  478.             if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)

  479.                 return fmt_size;

  480.             if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))

  481.                 st->codec->pix_fmt = AV_PIX_FMT_RGB24;

  482.             else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))

  483.                 st->codec->pix_fmt = AV_PIX_FMT_RGBA;

  484.             else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))

  485.                 st->codec->pix_fmt = AV_PIX_FMT_BGRA;

  486.             else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))

  487.                 st->codec->pix_fmt = AV_PIX_FMT_ARGB;

  488.             else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))

  489.                 st->codec->pix_fmt = AV_PIX_FMT_ABGR;

  490.             else {

  491.                 avpriv_request_sample(s, "color format %.16s", fmt);

  492.                 return AVERROR_PATCHWELCOME;

  493.             }

  494.             break;

  495. 

  496.         case ID_DGBL:

  497.             st->codec->codec_type            = AVMEDIA_TYPE_VIDEO;

  498.             if (data_size < 8)

  499.                 return AVERROR_INVALIDDATA;

  500.             st->codec->width                 = avio_rb16(pb);

  501.             st->codec->height                = avio_rb16(pb);

  502.             iff->bitmap_compression          = avio_rb16(pb);

  503.             st->sample_aspect_ratio.num      = avio_r8(pb);

  504.             st->sample_aspect_ratio.den      = avio_r8(pb);

  505.             st->codec->bits_per_coded_sample = 24;

  506.             break;

  507. 

  508.         case ID_DLOC:

  509.             if (data_size < 4)

  510.                 return AVERROR_INVALIDDATA;

  511.             st->codec->width  = avio_rb16(pb);

  512.             st->codec->height = avio_rb16(pb);

  513.             break;

  514. 

  515.         case ID_TVDC:

  516.             if (data_size < sizeof(iff->tvdc))

  517.                 return AVERROR_INVALIDDATA;

  518.             res = avio_read(pb, iff->tvdc, sizeof(iff->tvdc));

  519.             if (res < 0)

  520.                 return res;

  521.             break;

  522. 

  523.         case ID_ANNO:

  524.         case ID_TEXT:      metadata_tag = "comment";   break;

  525.         case ID_AUTH:      metadata_tag = "artist";    break;

  526.         case ID_COPYRIGHT: metadata_tag = "copyright"; break;

  527.         case ID_NAME:      metadata_tag = "title";     break;

  528. 

  529.         /* DSD tags */

  530. 

  531.         case MKTAG('F','V','E','R'):

  532.             if (data_size < 4)

  533.                 return AVERROR_INVALIDDATA;

  534.             version = avio_rb32(pb);

  535.             av_log(s, AV_LOG_DEBUG, "DSIFF v%d.%d.%d.%d\n",version >> 24, (version >> 16) & 0xFF, (version >> 8) & 0xFF, version & 0xFF);

  536.             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  537.             break;

  538. 

  539.         case MKTAG('D','I','I','N'):

  540.             res = parse_dsd_diin(s, st, orig_pos + data_size);

  541.             if (res < 0)

  542.                 return res;

  543.             break;

  544. 

  545.         case MKTAG('P','R','O','P'):

  546.             if (data_size < 4)

  547.                 return AVERROR_INVALIDDATA;

  548.             if (avio_rl32(pb) != MKTAG('S','N','D',' ')) {

  549.                 avpriv_request_sample(s, "unknown property type");

  550.                 break;

  551.             }

  552.             res = parse_dsd_prop(s, st, orig_pos + data_size);

  553.             if (res < 0)

  554.                 return res;

  555.             break;

  556. 

  557.         case MKTAG('C','O','M','T'):

  558.             if (data_size < 2)

  559.                 return AVERROR_INVALIDDATA;

  560.             nb_comments = avio_rb16(pb);

  561.             for (i = 0; i < nb_comments; i++) {

  562.                 int year, mon, day, hour, min, type, ref;

  563.                 char tmp[24];

  564.                 const char *tag;

  565.                 int metadata_size;

  566. 

  567.                 year = avio_rb16(pb);

  568.                 mon  = avio_r8(pb);

  569.                 day  = avio_r8(pb);

  570.                 hour = avio_r8(pb);

  571.                 min  = avio_r8(pb);

  572.                 snprintf(tmp, sizeof(tmp), "%04d-%02d-%02d %02d:%02d", year, mon, day, hour, min);

  573.                 av_dict_set(&st->metadata, "comment_time", tmp, 0);

  574. 

  575.                 type = avio_rb16(pb);

  576.                 ref  = avio_rb16(pb);

  577.                 switch (type) {

  578.                 case 1:

  579.                     if (!i)

  580.                         tag = "channel_comment";

  581.                     else {

  582.                         snprintf(tmp, sizeof(tmp), "channel%d_comment", ref);

  583.                         tag = tmp;

  584.                     }

  585.                     break;

  586.                 case 2:

  587.                     tag = ref < FF_ARRAY_ELEMS(dsd_source_comment) ? dsd_history_comment[ref] : "source_comment";

  588.                     break;

  589.                 case 3:

  590.                     tag = ref < FF_ARRAY_ELEMS(dsd_history_comment) ? dsd_history_comment[ref] : "file_history";

  591.                     break;

  592.                 default:

  593.                     tag = "comment";

  594.                 }

  595. 

  596.                 metadata_size  = avio_rb32(pb);

  597.                 if ((res = get_metadata(s, tag, metadata_size)) < 0) {

  598.                     av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", tag);

  599.                     return res;

  600.                 }

  601. 

  602.                 if (metadata_size & 1)

  603.                     avio_skip(pb, 1);

  604.             }

  605.             break;

  606.         }

  607. 

  608.         if (metadata_tag) {

  609.             if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {

  610.                 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);

  611.                 return res;

  612.             }

  613.         }

  614.         avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));

  615.     }

  616. 

  617.     avio_seek(pb, iff->body_pos, SEEK_SET);

  618. 

  619.     switch(st->codec->codec_type) {

  620.     case AVMEDIA_TYPE_AUDIO:

  621.         avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);

  622. 

  623.         if (st->codec->codec_tag == ID_16SV)

  624.             st->codec->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;

  625.         else if (st->codec->codec_tag == ID_MAUD) {

  626.             if (iff->maud_bits == 8 && !iff->maud_compression) {

  627.                 st->codec->codec_id = AV_CODEC_ID_PCM_U8;

  628.             } else if (iff->maud_bits == 16 && !iff->maud_compression) {

  629.                 st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;

  630.             } else if (iff->maud_bits ==  8 && iff->maud_compression == 2) {

  631.                 st->codec->codec_id = AV_CODEC_ID_PCM_ALAW;

  632.             } else if (iff->maud_bits ==  8 && iff->maud_compression == 3) {

  633.                 st->codec->codec_id = AV_CODEC_ID_PCM_MULAW;

  634.             } else {

  635.                 avpriv_request_sample(s, "compression %d and bit depth %d", iff->maud_compression, iff->maud_bits);

  636.                 return AVERROR_PATCHWELCOME;

  637.             }

  638.         } else if (st->codec->codec_tag != ID_DSD) {

  639.             switch (iff->svx8_compression) {

  640.             case COMP_NONE:

  641.                 st->codec->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;

  642.                 break;

  643.             case COMP_FIB:

  644.                 st->codec->codec_id = AV_CODEC_ID_8SVX_FIB;

  645.                 break;

  646.             case COMP_EXP:

  647.                 st->codec->codec_id = AV_CODEC_ID_8SVX_EXP;

  648.                 break;

  649.             default:

  650.                 av_log(s, AV_LOG_ERROR,

  651.                        "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);

  652.                 return -1;

  653.             }

  654.         }

  655. 

  656.         st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);

  657.         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;

  658.         st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;

  659.         break;

  660. 

  661.     case AVMEDIA_TYPE_VIDEO:

  662.         iff->bpp          = st->codec->bits_per_coded_sample;

  663.         if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {

  664.             iff->ham      = iff->bpp > 6 ? 6 : 4;

  665.             st->codec->bits_per_coded_sample = 24;

  666.         }

  667.         iff->flags        = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;

  668.         iff->masking      = masking;

  669.         iff->transparency = transparency;

  670. 

  671.         if (!st->codec->extradata) {

  672.             st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;

  673.             st->codec->extradata      = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);

  674.             if (!st->codec->extradata)

  675.                 return AVERROR(ENOMEM);

  676.         }

  677.         av_assert0(st->codec->extradata_size >= IFF_EXTRA_VIDEO_SIZE);

  678.         buf = st->codec->extradata;

  679.         bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);

  680.         bytestream_put_byte(&buf, iff->bitmap_compression);

  681.         bytestream_put_byte(&buf, iff->bpp);

  682.         bytestream_put_byte(&buf, iff->ham);

  683.         bytestream_put_byte(&buf, iff->flags);

  684.         bytestream_put_be16(&buf, iff->transparency);

  685.         bytestream_put_byte(&buf, iff->masking);

  686.         bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));

  687.         st->codec->codec_id = AV_CODEC_ID_IFF_ILBM;

  688.         break;

  689.     default:

  690.         return -1;

  691.     }

  692. 

  693.     return 0;

  694. }

  695. 

  696. static int iff_read_packet(AVFormatContext *s,

  697.                            AVPacket *pkt)

  698. {

  699.     IffDemuxContext *iff = s->priv_data;

  700.     AVIOContext *pb = s->pb;

  701.     AVStream *st = s->streams[0];

  702.     int ret;

  703.     int64_t pos = avio_tell(pb);

  704. 

  705.     if (pos >= iff->body_end)

  706.         return AVERROR_EOF;

  707. 

  708.     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  709.         if (st->codec->codec_tag == ID_DSD || st->codec->codec_tag == ID_MAUD) {

  710.             ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * st->codec->block_align));

  711.         } else {

  712.             ret = av_get_packet(pb, pkt, iff->body_size);

  713.         }

  714.     } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  715.         uint8_t *buf;

  716. 

  717.         if (av_new_packet(pkt, iff->body_size + 2) < 0) {

  718.             return AVERROR(ENOMEM);

  719.         }

  720. 

  721.         buf = pkt->data;

  722.         bytestream_put_be16(&buf, 2);

  723.         ret = avio_read(pb, buf, iff->body_size);

  724.         if (ret<0) {

  725.             av_free_packet(pkt);

  726.         } else if (ret < iff->body_size)

  727.             av_shrink_packet(pkt, ret + 2);

  728.     } else {

  729.         av_assert0(0);

  730.     }

  731. 

  732.     if (pos == iff->body_pos)

  733.         pkt->flags |= AV_PKT_FLAG_KEY;

  734.     if (ret < 0)

  735.         return ret;

  736.     pkt->stream_index = 0;

  737.     return ret;

  738. }

  739. 

  740. AVInputFormat ff_iff_demuxer = {

  741.     .name           = "iff",

  742.     .long_name      = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),

  743.     .priv_data_size = sizeof(IffDemuxContext),

  744.     .read_probe     = iff_probe,

  745.     .read_header    = iff_read_header,

  746.     .read_packet    = iff_read_packet,

  747.     .flags          = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,

  748. };