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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. #define ID_ANIM       MKTAG('A','N','I','M')

  63. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  80. 

  81. #define LEFT    2

  82. #define RIGHT   4

  83. #define STEREO  6

  84. 

  85. /**

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

  87.  * which contain additional information about video properties

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

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

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

  91.  * no extradata changing in this frame.

  92.  */

  93. #define IFF_EXTRA_VIDEO_SIZE 41

  94. 

  95. typedef enum {

  96.     COMP_NONE,

  97.     COMP_FIB,

  98.     COMP_EXP

  99. } svx8_compression_type;

  100. 

  101. typedef struct IffDemuxContext {

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

  103.     int64_t  body_pos;

  104.     int64_t  body_end;

  105.     uint32_t  body_size;

  106.     svx8_compression_type   svx8_compression;

  107.     unsigned  maud_bits;

  108.     unsigned  maud_compression;

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

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

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

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

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

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

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

  116. } IffDemuxContext;

  117. 

  118. /* Metadata string read */

  119. static int get_metadata(AVFormatContext *s,

  120.                         const char *const tag,

  121.                         const unsigned data_size)

  122. {

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

  124. 

  125.     if (!buf)

  126.         return AVERROR(ENOMEM);

  127. 

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

  129.         av_free(buf);

  130.         return AVERROR(EIO);

  131.     }

  132.     buf[data_size] = 0;

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

  134.     return 0;

  135. }

  136. 

  137. static int iff_probe(AVProbeData *p)

  138. {

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

  140. 

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

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

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

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

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

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

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

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

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

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

  151.           AV_RL32(d+8) == ID_ANIM ||

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

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

  154.         return AVPROBE_SCORE_MAX;

  155.     return 0;

  156. }

  157. 

  158. static const AVCodecTag dsd_codec_tags[] = {

  159.     { AV_CODEC_ID_DSD_MSBF, ID_DSD },

  160.     { AV_CODEC_ID_NONE, 0 },

  161. };

  162. 

  163. 

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

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

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

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

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

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

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

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

  172. 

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

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

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

  176. 

  177. typedef struct {

  178.     uint64_t layout;

  179.     const uint32_t * dsd_layout;

  180. } DSDLayoutDesc;

  181. 

  182. static const DSDLayoutDesc dsd_channel_layout[] = {

  183.     { AV_CH_LAYOUT_STEREO,  dsd_stereo },

  184.     { AV_CH_LAYOUT_5POINT0, dsd_5point0 },

  185.     { AV_CH_LAYOUT_5POINT1, dsd_5point1 },

  186. };

  187. 

  188. static const uint64_t dsd_loudspeaker_config[] = {

  189.     AV_CH_LAYOUT_STEREO,

  190.     0, 0,

  191.     AV_CH_LAYOUT_5POINT0, AV_CH_LAYOUT_5POINT1,

  192. };

  193. 

  194. static const char * dsd_source_comment[] = {

  195.     "dsd_source_comment",

  196.     "analogue_source_comment",

  197.     "pcm_source_comment",

  198. };

  199. 

  200. static const char * dsd_history_comment[] = {

  201.     "general_remark",

  202.     "operator_name",

  203.     "creating_machine",

  204.     "timezone",

  205.     "file_revision"

  206. };

  207. 

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

  209. {

  210.     AVIOContext *pb = s->pb;

  211. 

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

  213.         uint32_t tag      = avio_rl32(pb);

  214.         uint64_t size     = avio_rb64(pb);

  215.         uint64_t orig_pos = avio_tell(pb);

  216.         const char * metadata_tag = NULL;

  217. 

  218.         switch(tag) {

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

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

  221.         }

  222. 

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

  224.             unsigned int tag_size = avio_rb32(pb);

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

  226.             if (ret < 0) {

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

  228.                 return ret;

  229.             }

  230.         }

  231. 

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

  233.     }

  234. 

  235.     return 0;

  236. }

  237. 

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

  239. {

  240.     AVIOContext *pb = s->pb;

  241.     char abss[24];

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

  243.     int dsd_layout[6];

  244.     ID3v2ExtraMeta *id3v2_extra_meta;

  245. 

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

  247.         uint32_t tag      = avio_rl32(pb);

  248.         uint64_t size     = avio_rb64(pb);

  249.         uint64_t orig_pos = avio_tell(pb);

  250. 

  251.         switch(tag) {

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

  253.             if (size < 8)

  254.                 return AVERROR_INVALIDDATA;

  255.             hour = avio_rb16(pb);

  256.             min  = avio_r8(pb);

  257.             sec  = avio_r8(pb);

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

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

  260.             break;

  261. 

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

  263.             if (size < 2)

  264.                 return AVERROR_INVALIDDATA;

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

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

  267.                 return AVERROR_INVALIDDATA;

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

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

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

  271.                 break;

  272.             }

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

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

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

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

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

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

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

  280.                     break;

  281.                 }

  282.             }

  283.             break;

  284. 

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

  286.             if (size < 4)

  287.                 return AVERROR_INVALIDDATA;

  288.             tag = avio_rl32(pb);

  289.             st->codec->codec_id = ff_codec_get_id(dsd_codec_tags, tag);

  290.             if (!st->codec->codec_id) {

  291.                 av_log(s, AV_LOG_ERROR, "'%c%c%c%c' compression is not supported\n",

  292.                     tag&0xFF, (tag>>8)&0xFF, (tag>>16)&0xFF, (tag>>24)&0xFF);

  293.                 return AVERROR_PATCHWELCOME;

  294.             }

  295.             break;

  296. 

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

  298.             if (size < 4)

  299.                 return AVERROR_INVALIDDATA;

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

  301.             break;

  302. 

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

  304.             id3v2_extra_meta = NULL;

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

  306.             if (id3v2_extra_meta) {

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

  308.                     ff_id3v2_free_extra_meta(&id3v2_extra_meta);

  309.                     return ret;

  310.                 }

  311.                 ff_id3v2_free_extra_meta(&id3v2_extra_meta);

  312.             }

  313. 

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

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

  316.                 return AVERROR_INVALIDDATA;

  317.             }

  318.             break;

  319. 

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

  321.             if (size < 2)

  322.                 return AVERROR_INVALIDDATA;

  323.             config = avio_rb16(pb);

  324.             if (config != 0xFFFF) {

  325.                 if (config < FF_ARRAY_ELEMS(dsd_loudspeaker_config))

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

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

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

  329.             }

  330.             break;

  331.         }

  332. 

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

  334.     }

  335. 

  336.     return 0;

  337. }

  338. 

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

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

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

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

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

  344. 

  345. static int iff_read_header(AVFormatContext *s)

  346. {

  347.     IffDemuxContext *iff = s->priv_data;

  348.     AVIOContext *pb = s->pb;

  349.     AVStream *st;

  350.     uint8_t *buf;

  351.     uint32_t chunk_id;

  352.     uint64_t data_size;

  353.     uint32_t screenmode = 0, num, den;

  354.     unsigned transparency = 0;

  355.     unsigned masking = 0; // no mask

  356.     uint8_t fmt[16];

  357.     int fmt_size;

  358. 

  359.     st = avformat_new_stream(s, NULL);

  360.     if (!st)

  361.         return AVERROR(ENOMEM);

  362. 

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

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

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

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

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

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

  369.     if (st->codec->codec_tag == ID_ANIM) {

  370.         avio_skip(pb, 8);

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

  372.     }

  373.     iff->bitmap_compression = -1;

  374.     iff->svx8_compression = -1;

  375.     iff->maud_bits = -1;

  376.     iff->maud_compression = -1;

  377. 

  378.     while(!avio_feof(pb)) {

  379.         uint64_t orig_pos;

  380.         int res;

  381.         const char *metadata_tag = NULL;

  382.         int version, nb_comments, i;

  383.         chunk_id = avio_rl32(pb);

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

  385.         orig_pos = avio_tell(pb);

  386. 

  387.         switch(chunk_id) {

  388.         case ID_VHDR:

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

  390. 

  391.             if (data_size < 14)

  392.                 return AVERROR_INVALIDDATA;

  393.             avio_skip(pb, 12);

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

  395.             if (data_size >= 16) {

  396.                 avio_skip(pb, 1);

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

  398.             }

  399.             break;

  400. 

  401.         case ID_MHDR:

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

  403. 

  404.             if (data_size < 32)

  405.                 return AVERROR_INVALIDDATA;

  406.             avio_skip(pb, 4);

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

  408.             avio_skip(pb, 2);

  409.             num = avio_rb32(pb);

  410.             den = avio_rb16(pb);

  411.             if (!den)

  412.                 return AVERROR_INVALIDDATA;

  413.             avio_skip(pb, 2);

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

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

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

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

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

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

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

  421.             break;

  422. 

  423.         case ID_ABIT:

  424.         case ID_BODY:

  425.         case ID_DBOD:

  426.         case ID_DSD:

  427.         case ID_MDAT:

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

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

  430.             iff->body_size = data_size;

  431.             break;

  432. 

  433.         case ID_CHAN:

  434.             if (data_size < 4)

  435.                 return AVERROR_INVALIDDATA;

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

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

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

  439.             } else {

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

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

  442.             }

  443.             break;

  444. 

  445.         case ID_CAMG:

  446.             if (data_size < 4)

  447.                 return AVERROR_INVALIDDATA;

  448.             screenmode                = avio_rb32(pb);

  449.             break;

  450. 

  451.         case ID_CMAP:

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

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

  454.                         data_size);

  455.                  return AVERROR_INVALIDDATA;

  456.             }

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

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

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

  460.                 return AVERROR(ENOMEM);

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

  462.                 return AVERROR(EIO);

  463.             break;

  464. 

  465.         case ID_BMHD:

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

  467.             if (data_size <= 8)

  468.                 return AVERROR_INVALIDDATA;

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

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

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

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

  473.             if (data_size >= 10)

  474.                 masking                      = avio_r8(pb);

  475.             if (data_size >= 11)

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

  477.             if (data_size >= 14) {

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

  479.                 transparency                 = avio_rb16(pb);

  480.             }

  481.             if (data_size >= 16) {

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

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

  484.             }

  485.             break;

  486. 

  487.         case ID_DPEL:

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

  489.                 return AVERROR_INVALIDDATA;

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

  491.                 return fmt_size;

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

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

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

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

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

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

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

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

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

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

  502.             else {

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

  504.                 return AVERROR_PATCHWELCOME;

  505.             }

  506.             break;

  507. 

  508.         case ID_DGBL:

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

  510.             if (data_size < 8)

  511.                 return AVERROR_INVALIDDATA;

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

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

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

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

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

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

  518.             break;

  519. 

  520.         case ID_DLOC:

  521.             if (data_size < 4)

  522.                 return AVERROR_INVALIDDATA;

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

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

  525.             break;

  526. 

  527.         case ID_TVDC:

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

  529.                 return AVERROR_INVALIDDATA;

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

  531.             if (res < 0)

  532.                 return res;

  533.             break;

  534. 

  535.         case ID_ANNO:

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

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

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

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

  540. 

  541.         /* DSD tags */

  542. 

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

  544.             if (data_size < 4)

  545.                 return AVERROR_INVALIDDATA;

  546.             version = avio_rb32(pb);

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

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

  549.             break;

  550. 

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

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

  553.             if (res < 0)

  554.                 return res;

  555.             break;

  556. 

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

  558.             if (data_size < 4)

  559.                 return AVERROR_INVALIDDATA;

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

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

  562.                 break;

  563.             }

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

  565.             if (res < 0)

  566.                 return res;

  567.             break;

  568. 

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

  570.             if (data_size < 2)

  571.                 return AVERROR_INVALIDDATA;

  572.             nb_comments = avio_rb16(pb);

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

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

  575.                 char tmp[24];

  576.                 const char *tag;

  577.                 int metadata_size;

  578. 

  579.                 year = avio_rb16(pb);

  580.                 mon  = avio_r8(pb);

  581.                 day  = avio_r8(pb);

  582.                 hour = avio_r8(pb);

  583.                 min  = avio_r8(pb);

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

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

  586. 

  587.                 type = avio_rb16(pb);

  588.                 ref  = avio_rb16(pb);

  589.                 switch (type) {

  590.                 case 1:

  591.                     if (!i)

  592.                         tag = "channel_comment";

  593.                     else {

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

  595.                         tag = tmp;

  596.                     }

  597.                     break;

  598.                 case 2:

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

  600.                     break;

  601.                 case 3:

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

  603.                     break;

  604.                 default:

  605.                     tag = "comment";

  606.                 }

  607. 

  608.                 metadata_size  = avio_rb32(pb);

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

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

  611.                     return res;

  612.                 }

  613. 

  614.                 if (metadata_size & 1)

  615.                     avio_skip(pb, 1);

  616.             }

  617.             break;

  618.         }

  619. 

  620.         if (metadata_tag) {

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

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

  623.                 return res;

  624.             }

  625.         }

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

  627.     }

  628. 

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

  630. 

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

  632.     case AVMEDIA_TYPE_AUDIO:

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

  634. 

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

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

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

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

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

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

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

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

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

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

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

  646.             } else {

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

  648.                 return AVERROR_PATCHWELCOME;

  649.             }

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

  651.             switch (iff->svx8_compression) {

  652.             case COMP_NONE:

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

  654.                 break;

  655.             case COMP_FIB:

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

  657.                 break;

  658.             case COMP_EXP:

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

  660.                 break;

  661.             default:

  662.                 av_log(s, AV_LOG_ERROR,

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

  664.                 return -1;

  665.             }

  666.         }

  667. 

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

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

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

  671.         break;

  672. 

  673.     case AVMEDIA_TYPE_VIDEO:

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

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

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

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

  678.         }

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

  680.         iff->masking      = masking;

  681.         iff->transparency = transparency;

  682. 

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

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

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

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

  687.                 return AVERROR(ENOMEM);

  688.         }

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

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

  691.         bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);

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

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

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

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

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

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

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

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

  700.         break;

  701.     default:

  702.         return -1;

  703.     }

  704. 

  705.     return 0;

  706. }

  707. 

  708. static int iff_read_packet(AVFormatContext *s,

  709.                            AVPacket *pkt)

  710. {

  711.     IffDemuxContext *iff = s->priv_data;

  712.     AVIOContext *pb = s->pb;

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

  714.     int ret;

  715.     int64_t pos = avio_tell(pb);

  716. 

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

  718.         return AVERROR_EOF;

  719. 

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

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

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

  723.         } else {

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

  725.         }

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

  727.         uint8_t *buf;

  728. 

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

  730.             return AVERROR(ENOMEM);

  731.         }

  732. 

  733.         buf = pkt->data;

  734.         bytestream_put_be16(&buf, 2);

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

  736.         if (ret<0) {

  737.             av_free_packet(pkt);

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

  739.             av_shrink_packet(pkt, ret + 2);

  740.     } else {

  741.         av_assert0(0);

  742.     }

  743. 

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

  745.         pkt->flags |= AV_PKT_FLAG_KEY;

  746.     if (ret < 0)

  747.         return ret;

  748.     pkt->stream_index = 0;

  749.     return ret;

  750. }

  751. 

  752. AVInputFormat ff_iff_demuxer = {

  753.     .name           = "iff",

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

  755.     .priv_data_size = sizeof(IffDemuxContext),

  756.     .read_probe     = iff_probe,

  757.     .read_header    = iff_read_header,

  758.     .read_packet    = iff_read_packet,

  759.     .flags          = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,

  760. };