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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_DST        MKTAG('D','S','T',' ')

  63. #define ID_DSTC       MKTAG('D','S','T','C')

  64. #define ID_DSTF       MKTAG('D','S','T','F')

  65. #define ID_FRTE       MKTAG('F','R','T','E')

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

  67. #define ID_ANHD       MKTAG('A','N','H','D')

  68. #define ID_DLTA       MKTAG('D','L','T','A')

  69. #define ID_DPAN       MKTAG('D','P','A','N')

  70. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  87. 

  88. #define LEFT    2

  89. #define RIGHT   4

  90. #define STEREO  6

  91. 

  92. /**

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

  94.  * which contain additional information about video properties

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

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

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

  98.  * no extradata changing in this frame.

  99.  */

  100. #define IFF_EXTRA_VIDEO_SIZE 41

  101. 

  102. typedef enum {

  103.     COMP_NONE,

  104.     COMP_FIB,

  105.     COMP_EXP

  106. } svx8_compression_type;

  107. 

  108. typedef struct IffDemuxContext {

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

  110.     int64_t  body_pos;

  111.     int64_t  body_end;

  112.     uint32_t  body_size;

  113.     svx8_compression_type   svx8_compression;

  114.     unsigned  maud_bits;

  115.     unsigned  maud_compression;

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

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

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

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

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

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

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

  123.     int64_t   pts;

  124. } IffDemuxContext;

  125. 

  126. /* Metadata string read */

  127. static int get_metadata(AVFormatContext *s,

  128.                         const char *const tag,

  129.                         const unsigned data_size)

  130. {

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

  132. 

  133.     if (!buf)

  134.         return AVERROR(ENOMEM);

  135. 

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

  137.         av_free(buf);

  138.         return AVERROR(EIO);

  139.     }

  140.     buf[data_size] = 0;

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

  142.     return 0;

  143. }

  144. 

  145. static int iff_probe(const AVProbeData *p)

  146. {

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

  148. 

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

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

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

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

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

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

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

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

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

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

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

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

  161.         return AVPROBE_SCORE_MAX;

  162.     return 0;

  163. }

  164. 

  165. static const AVCodecTag dsd_codec_tags[] = {

  166.     { AV_CODEC_ID_DSD_MSBF, ID_DSD },

  167.     { AV_CODEC_ID_DST,      ID_DST },

  168.     { AV_CODEC_ID_NONE, 0 },

  169. };

  170. 

  171. 

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

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

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

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

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

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

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

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

  180. 

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

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

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

  184. 

  185. typedef struct {

  186.     uint64_t layout;

  187.     const uint32_t * dsd_layout;

  188. } DSDLayoutDesc;

  189. 

  190. static const DSDLayoutDesc dsd_channel_layout[] = {

  191.     { AV_CH_LAYOUT_STEREO,  dsd_stereo },

  192.     { AV_CH_LAYOUT_5POINT0, dsd_5point0 },

  193.     { AV_CH_LAYOUT_5POINT1, dsd_5point1 },

  194. };

  195. 

  196. static const uint64_t dsd_loudspeaker_config[] = {

  197.     AV_CH_LAYOUT_STEREO,

  198.     0, 0,

  199.     AV_CH_LAYOUT_5POINT0, AV_CH_LAYOUT_5POINT1,

  200. };

  201. 

  202. static const char * dsd_source_comment[] = {

  203.     "dsd_source_comment",

  204.     "analogue_source_comment",

  205.     "pcm_source_comment",

  206. };

  207. 

  208. static const char * dsd_history_comment[] = {

  209.     "general_remark",

  210.     "operator_name",

  211.     "creating_machine",

  212.     "timezone",

  213.     "file_revision"

  214. };

  215. 

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

  217. {

  218.     AVIOContext *pb = s->pb;

  219. 

  220.     while (avio_tell(pb) + 12 <= eof && !avio_feof(pb)) {

  221.         uint32_t tag      = avio_rl32(pb);

  222.         uint64_t size     = avio_rb64(pb);

  223.         uint64_t orig_pos = avio_tell(pb);

  224.         const char * metadata_tag = NULL;

  225. 

  226.         if (size >= INT64_MAX)

  227.             return AVERROR_INVALIDDATA;

  228. 

  229.         switch(tag) {

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

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

  232.         }

  233. 

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

  235.             unsigned int tag_size = avio_rb32(pb);

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

  237.             if (ret < 0) {

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

  239.                 return ret;

  240.             }

  241.         }

  242. 

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

  244.     }

  245. 

  246.     return 0;

  247. }

  248. 

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

  250. {

  251.     AVIOContext *pb = s->pb;

  252.     char abss[24];

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

  254.     int dsd_layout[6];

  255.     ID3v2ExtraMeta *id3v2_extra_meta;

  256. 

  257.     while (avio_tell(pb) + 12 <= eof && !avio_feof(pb)) {

  258.         uint32_t tag      = avio_rl32(pb);

  259.         uint64_t size     = avio_rb64(pb);

  260.         uint64_t orig_pos = avio_tell(pb);

  261. 

  262.         if (size >= INT64_MAX)

  263.             return AVERROR_INVALIDDATA;

  264. 

  265.         switch(tag) {

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

  267.             if (size < 8)

  268.                 return AVERROR_INVALIDDATA;

  269.             hour = avio_rb16(pb);

  270.             min  = avio_r8(pb);

  271.             sec  = avio_r8(pb);

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

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

  274.             break;

  275. 

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

  277.             if (size < 2)

  278.                 return AVERROR_INVALIDDATA;

  279.             st->codecpar->channels       = avio_rb16(pb);

  280.             if (size < 2 + st->codecpar->channels * 4)

  281.                 return AVERROR_INVALIDDATA;

  282.             st->codecpar->channel_layout = 0;

  283.             if (st->codecpar->channels > FF_ARRAY_ELEMS(dsd_layout)) {

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

  285.                 break;

  286.             }

  287.             for (i = 0; i < st->codecpar->channels; i++)

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

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

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

  291.                 if (av_get_channel_layout_nb_channels(d->layout) == st->codecpar->channels &&

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

  293.                     st->codecpar->channel_layout = d->layout;

  294.                     break;

  295.                 }

  296.             }

  297.             break;

  298. 

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

  300.             if (size < 4)

  301.                 return AVERROR_INVALIDDATA;

  302.             st->codecpar->codec_tag = tag = avio_rl32(pb);

  303.             st->codecpar->codec_id = ff_codec_get_id(dsd_codec_tags, tag);

  304.             if (!st->codecpar->codec_id) {

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

  306.                        av_fourcc2str(tag));

  307.                 return AVERROR_PATCHWELCOME;

  308.             }

  309.             break;

  310. 

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

  312.             if (size < 4)

  313.                 return AVERROR_INVALIDDATA;

  314.             st->codecpar->sample_rate = avio_rb32(pb) / 8;

  315.             break;

  316. 

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

  318.             id3v2_extra_meta = NULL;

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

  320.             if (id3v2_extra_meta) {

  321.                 if ((ret = ff_id3v2_parse_apic(s, id3v2_extra_meta)) < 0 ||

  322.                     (ret = ff_id3v2_parse_chapters(s, id3v2_extra_meta)) < 0) {

  323.                     ff_id3v2_free_extra_meta(&id3v2_extra_meta);

  324.                     return ret;

  325.                 }

  326.                 ff_id3v2_free_extra_meta(&id3v2_extra_meta);

  327.             }

  328. 

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

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

  331.                 return AVERROR_INVALIDDATA;

  332.             }

  333.             break;

  334. 

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

  336.             if (size < 2)

  337.                 return AVERROR_INVALIDDATA;

  338.             config = avio_rb16(pb);

  339.             if (config != 0xFFFF) {

  340.                 if (config < FF_ARRAY_ELEMS(dsd_loudspeaker_config))

  341.                     st->codecpar->channel_layout = dsd_loudspeaker_config[config];

  342.                 if (!st->codecpar->channel_layout)

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

  344.             }

  345.             break;

  346.         }

  347. 

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

  349.     }

  350. 

  351.     return 0;

  352. }

  353. 

  354. static int read_dst_frame(AVFormatContext *s, AVPacket *pkt)

  355. {

  356.     IffDemuxContext *iff = s->priv_data;

  357.     AVIOContext *pb = s->pb;

  358.     uint32_t chunk_id;

  359.     uint64_t chunk_pos, data_pos, data_size;

  360.     int ret = AVERROR_EOF;

  361. 

  362.     while (!avio_feof(pb)) {

  363.         chunk_pos = avio_tell(pb);

  364.         if (chunk_pos >= iff->body_end)

  365.             return AVERROR_EOF;

  366. 

  367.         chunk_id = avio_rl32(pb);

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

  369.         data_pos = avio_tell(pb);

  370. 

  371.         if (data_size < 1)

  372.             return AVERROR_INVALIDDATA;

  373. 

  374.         switch (chunk_id) {

  375.         case ID_DSTF:

  376.             if (!pkt) {

  377.                 iff->body_pos  = avio_tell(pb) - (iff->is_64bit ? 12 : 8);

  378.                 iff->body_size = iff->body_end - iff->body_pos;

  379.                 return 0;

  380.             }

  381.             ret = av_get_packet(pb, pkt, data_size);

  382.             if (ret < 0)

  383.                 return ret;

  384.             if (data_size & 1)

  385.                 avio_skip(pb, 1);

  386.             pkt->flags |= AV_PKT_FLAG_KEY;

  387.             pkt->stream_index = 0;

  388.             pkt->duration = 588 * s->streams[0]->codecpar->sample_rate / 44100;

  389.             pkt->pos = chunk_pos;

  390. 

  391.             chunk_pos = avio_tell(pb);

  392.             if (chunk_pos >= iff->body_end)

  393.                 return 0;

  394. 

  395.             avio_seek(pb, chunk_pos, SEEK_SET);

  396.             return 0;

  397. 

  398.         case ID_FRTE:

  399.             if (data_size < 4)

  400.                 return AVERROR_INVALIDDATA;

  401.             s->streams[0]->duration = avio_rb32(pb) * 588LL * s->streams[0]->codecpar->sample_rate / 44100;

  402.             break;

  403.         }

  404. 

  405.         avio_skip(pb, data_size - (avio_tell(pb) - data_pos) + (data_size & 1));

  406.     }

  407. 

  408.     return ret;

  409. }

  410. 

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

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

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

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

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

  416. 

  417. static int iff_read_header(AVFormatContext *s)

  418. {

  419.     IffDemuxContext *iff = s->priv_data;

  420.     AVIOContext *pb = s->pb;

  421.     AVStream *st;

  422.     uint8_t *buf;

  423.     uint32_t chunk_id;

  424.     uint64_t data_size;

  425.     uint32_t screenmode = 0, num, den;

  426.     unsigned transparency = 0;

  427.     unsigned masking = 0; // no mask

  428.     uint8_t fmt[16];

  429.     int fmt_size;

  430. 

  431.     st = avformat_new_stream(s, NULL);

  432.     if (!st)

  433.         return AVERROR(ENOMEM);

  434. 

  435.     st->codecpar->channels = 1;

  436.     st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;

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

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

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

  440.     st->codecpar->codec_tag = avio_rl32(pb);

  441.     if (st->codecpar->codec_tag == ID_ANIM) {

  442.         avio_skip(pb, 12);

  443.     }

  444.     iff->bitmap_compression = -1;

  445.     iff->svx8_compression = -1;

  446.     iff->maud_bits = -1;

  447.     iff->maud_compression = -1;

  448. 

  449.     while(!avio_feof(pb)) {

  450.         uint64_t orig_pos;

  451.         int res;

  452.         const char *metadata_tag = NULL;

  453.         int version, nb_comments, i;

  454.         chunk_id = avio_rl32(pb);

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

  456.         orig_pos = avio_tell(pb);

  457. 

  458.         if (data_size >= INT64_MAX)

  459.             return AVERROR_INVALIDDATA;

  460. 

  461.         switch(chunk_id) {

  462.         case ID_VHDR:

  463.             st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

  464. 

  465.             if (data_size < 14)

  466.                 return AVERROR_INVALIDDATA;

  467.             avio_skip(pb, 12);

  468.             st->codecpar->sample_rate = avio_rb16(pb);

  469.             if (data_size >= 16) {

  470.                 avio_skip(pb, 1);

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

  472.             }

  473.             break;

  474. 

  475.         case ID_MHDR:

  476.             st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

  477. 

  478.             if (data_size < 32)

  479.                 return AVERROR_INVALIDDATA;

  480.             avio_skip(pb, 4);

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

  482.             avio_skip(pb, 2);

  483.             num = avio_rb32(pb);

  484.             den = avio_rb16(pb);

  485.             if (!den)

  486.                 return AVERROR_INVALIDDATA;

  487.             avio_skip(pb, 2);

  488.             st->codecpar->sample_rate = num / den;

  489.             st->codecpar->channels = avio_rb16(pb);

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

  491.             if (st->codecpar->channels == 1)

  492.                 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;

  493.             else if (st->codecpar->channels == 2)

  494.                 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;

  495.             break;

  496. 

  497.         case ID_ABIT:

  498.         case ID_BODY:

  499.         case ID_DBOD:

  500.         case ID_DSD:

  501.         case ID_DST:

  502.         case ID_MDAT:

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

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

  505.             iff->body_size = data_size;

  506.             if (chunk_id == ID_DST) {

  507.                 int ret = read_dst_frame(s, NULL);

  508.                 if (ret < 0)

  509.                     return ret;

  510.             }

  511.             break;

  512. 

  513.         case ID_CHAN:

  514.             if (data_size < 4)

  515.                 return AVERROR_INVALIDDATA;

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

  517.                 st->codecpar->channels       = 1;

  518.                 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;

  519.             } else {

  520.                 st->codecpar->channels       = 2;

  521.                 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;

  522.             }

  523.             break;

  524. 

  525.         case ID_CAMG:

  526.             if (data_size < 4)

  527.                 return AVERROR_INVALIDDATA;

  528.             screenmode                = avio_rb32(pb);

  529.             break;

  530. 

  531.         case ID_CMAP:

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

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

  534.                         data_size);

  535.                  return AVERROR_INVALIDDATA;

  536.             }

  537.             res = ff_alloc_extradata(st->codecpar,

  538.                                      data_size + IFF_EXTRA_VIDEO_SIZE);

  539.             if (res < 0)

  540.                 return res;

  541.             if (avio_read(pb, st->codecpar->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0) {

  542.                 av_freep(&st->codecpar->extradata);

  543.                 st->codecpar->extradata_size = 0;

  544.                 return AVERROR(EIO);

  545.             }

  546.             break;

  547. 

  548.         case ID_BMHD:

  549.             st->codecpar->codec_type            = AVMEDIA_TYPE_VIDEO;

  550.             if (data_size <= 8)

  551.                 return AVERROR_INVALIDDATA;

  552.             st->codecpar->width                 = avio_rb16(pb);

  553.             st->codecpar->height                = avio_rb16(pb);

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

  555.             st->codecpar->bits_per_coded_sample = avio_r8(pb);

  556.             if (data_size >= 10)

  557.                 masking                      = avio_r8(pb);

  558.             if (data_size >= 11)

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

  560.             if (data_size >= 14) {

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

  562.                 transparency                 = avio_rb16(pb);

  563.             }

  564.             if (data_size >= 16) {

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

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

  567.             }

  568.             break;

  569. 

  570.         case ID_ANHD:

  571.             break;

  572. 

  573.         case ID_DPAN:

  574.             avio_skip(pb, 2);

  575.             st->duration = avio_rb16(pb);

  576.             break;

  577. 

  578.         case ID_DPEL:

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

  580.                 return AVERROR_INVALIDDATA;

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

  582.                 return fmt_size;

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

  584.                 st->codecpar->format = AV_PIX_FMT_RGB24;

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

  586.                 st->codecpar->format = AV_PIX_FMT_RGBA;

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

  588.                 st->codecpar->format = AV_PIX_FMT_BGRA;

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

  590.                 st->codecpar->format = AV_PIX_FMT_ARGB;

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

  592.                 st->codecpar->format = AV_PIX_FMT_ABGR;

  593.             else {

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

  595.                 return AVERROR_PATCHWELCOME;

  596.             }

  597.             break;

  598. 

  599.         case ID_DGBL:

  600.             st->codecpar->codec_type         = AVMEDIA_TYPE_VIDEO;

  601.             if (data_size < 8)

  602.                 return AVERROR_INVALIDDATA;

  603.             st->codecpar->width              = avio_rb16(pb);

  604.             st->codecpar->height             = avio_rb16(pb);

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

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

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

  608.             st->codecpar->bits_per_coded_sample = 24;

  609.             break;

  610. 

  611.         case ID_DLOC:

  612.             if (data_size < 4)

  613.                 return AVERROR_INVALIDDATA;

  614.             st->codecpar->width  = avio_rb16(pb);

  615.             st->codecpar->height = avio_rb16(pb);

  616.             break;

  617. 

  618.         case ID_TVDC:

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

  620.                 return AVERROR_INVALIDDATA;

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

  622.             if (res < 0)

  623.                 return res;

  624.             break;

  625. 

  626.         case ID_ANNO:

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

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

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

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

  631. 

  632.         /* DSD tags */

  633. 

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

  635.             if (data_size < 4)

  636.                 return AVERROR_INVALIDDATA;

  637.             version = avio_rb32(pb);

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

  639.             st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

  640.             break;

  641. 

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

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

  644.             if (res < 0)

  645.                 return res;

  646.             break;

  647. 

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

  649.             if (data_size < 4)

  650.                 return AVERROR_INVALIDDATA;

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

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

  653.                 break;

  654.             }

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

  656.             if (res < 0)

  657.                 return res;

  658.             break;

  659. 

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

  661.             if (data_size < 2)

  662.                 return AVERROR_INVALIDDATA;

  663.             nb_comments = avio_rb16(pb);

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

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

  666.                 char tmp[24];

  667.                 const char *tag;

  668.                 int metadata_size;

  669. 

  670.                 year = avio_rb16(pb);

  671.                 mon  = avio_r8(pb);

  672.                 day  = avio_r8(pb);

  673.                 hour = avio_r8(pb);

  674.                 min  = avio_r8(pb);

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

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

  677. 

  678.                 type = avio_rb16(pb);

  679.                 ref  = avio_rb16(pb);

  680.                 switch (type) {

  681.                 case 1:

  682.                     if (!i)

  683.                         tag = "channel_comment";

  684.                     else {

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

  686.                         tag = tmp;

  687.                     }

  688.                     break;

  689.                 case 2:

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

  691.                     break;

  692.                 case 3:

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

  694.                     break;

  695.                 default:

  696.                     tag = "comment";

  697.                 }

  698. 

  699.                 metadata_size  = avio_rb32(pb);

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

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

  702.                     return res;

  703.                 }

  704. 

  705.                 if (metadata_size & 1)

  706.                     avio_skip(pb, 1);

  707.             }

  708.             break;

  709.         }

  710. 

  711.         if (metadata_tag) {

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

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

  714.                 return res;

  715.             }

  716.         }

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

  718.     }

  719. 

  720.     if (st->codecpar->codec_tag == ID_ANIM)

  721.         avio_seek(pb, 12, SEEK_SET);

  722.     else

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

  724. 

  725.     switch(st->codecpar->codec_type) {

  726.     case AVMEDIA_TYPE_AUDIO:

  727.         avpriv_set_pts_info(st, 32, 1, st->codecpar->sample_rate);

  728. 

  729.         if (st->codecpar->codec_tag == ID_16SV)

  730.             st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;

  731.         else if (st->codecpar->codec_tag == ID_MAUD) {

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

  733.                 st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;

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

  735.                 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;

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

  737.                 st->codecpar->codec_id = AV_CODEC_ID_PCM_ALAW;

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

  739.                 st->codecpar->codec_id = AV_CODEC_ID_PCM_MULAW;

  740.             } else {

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

  742.                 return AVERROR_PATCHWELCOME;

  743.             }

  744.         } else if (st->codecpar->codec_tag != ID_DSD &&

  745.                    st->codecpar->codec_tag != ID_DST) {

  746.             switch (iff->svx8_compression) {

  747.             case COMP_NONE:

  748.                 st->codecpar->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;

  749.                 break;

  750.             case COMP_FIB:

  751.                 st->codecpar->codec_id = AV_CODEC_ID_8SVX_FIB;

  752.                 break;

  753.             case COMP_EXP:

  754.                 st->codecpar->codec_id = AV_CODEC_ID_8SVX_EXP;

  755.                 break;

  756.             default:

  757.                 av_log(s, AV_LOG_ERROR,

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

  759.                 return -1;

  760.             }

  761.         }

  762. 

  763.         st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id);

  764.         st->codecpar->bit_rate = (int64_t)st->codecpar->channels * st->codecpar->sample_rate * st->codecpar->bits_per_coded_sample;

  765.         st->codecpar->block_align = st->codecpar->channels * st->codecpar->bits_per_coded_sample;

  766.         if (st->codecpar->codec_tag == ID_DSD && st->codecpar->block_align <= 0)

  767.             return AVERROR_INVALIDDATA;

  768.         break;

  769. 

  770.     case AVMEDIA_TYPE_VIDEO:

  771.         iff->bpp          = st->codecpar->bits_per_coded_sample;

  772.         if (st->codecpar->codec_tag == ID_ANIM)

  773.             avpriv_set_pts_info(st, 32, 1, 60);

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

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

  776.             st->codecpar->bits_per_coded_sample = 24;

  777.         }

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

  779.         iff->masking      = masking;

  780.         iff->transparency = transparency;

  781. 

  782.         if (!st->codecpar->extradata) {

  783.             int ret = ff_alloc_extradata(st->codecpar, IFF_EXTRA_VIDEO_SIZE);

  784.             if (ret < 0)

  785.                 return ret;

  786.         }

  787.         av_assert0(st->codecpar->extradata_size >= IFF_EXTRA_VIDEO_SIZE);

  788.         buf = st->codecpar->extradata;

  789.         bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);

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

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

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

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

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

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

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

  797.         st->codecpar->codec_id = AV_CODEC_ID_IFF_ILBM;

  798.         break;

  799.     default:

  800.         return -1;

  801.     }

  802. 

  803.     return 0;

  804. }

  805. 

  806. static unsigned get_anim_duration(uint8_t *buf, int size)

  807. {

  808.     GetByteContext gb;

  809. 

  810.     bytestream2_init(&gb, buf, size);

  811.     bytestream2_skip(&gb, 4);

  812.     while (bytestream2_get_bytes_left(&gb) > 8) {

  813.         unsigned chunk = bytestream2_get_le32(&gb);

  814.         unsigned size = bytestream2_get_be32(&gb);

  815. 

  816.         if (chunk == ID_ANHD) {

  817.             if (size < 40)

  818.                 break;

  819.             bytestream2_skip(&gb, 14);

  820.             return bytestream2_get_be32(&gb);

  821.         } else {

  822.             bytestream2_skip(&gb, size + size & 1);

  823.         }

  824.     }

  825.     return 10;

  826. }

  827. 

  828. static int iff_read_packet(AVFormatContext *s,

  829.                            AVPacket *pkt)

  830. {

  831.     IffDemuxContext *iff = s->priv_data;

  832.     AVIOContext *pb = s->pb;

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

  834.     int ret;

  835.     int64_t pos = avio_tell(pb);

  836. 

  837.     if (avio_feof(pb))

  838.         return AVERROR_EOF;

  839.     if (st->codecpar->codec_tag != ID_ANIM && pos >= iff->body_end)

  840.         return AVERROR_EOF;

  841. 

  842.     if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {

  843.         if (st->codecpar->codec_tag == ID_DSD || st->codecpar->codec_tag == ID_MAUD) {

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

  845.         } else if (st->codecpar->codec_tag == ID_DST) {

  846.             return read_dst_frame(s, pkt);

  847.         } else {

  848.             if (iff->body_size > INT_MAX || !iff->body_size)

  849.                 return AVERROR_INVALIDDATA;

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

  851.         }

  852.     } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&

  853.                st->codecpar->codec_tag  == ID_ANIM) {

  854.         uint64_t data_size, orig_pos;

  855.         uint32_t chunk_id, chunk_id2;

  856. 

  857.         while (!avio_feof(pb)) {

  858.             if (avio_feof(pb))

  859.                 return AVERROR_EOF;

  860. 

  861.             orig_pos  = avio_tell(pb);

  862.             chunk_id  = avio_rl32(pb);

  863.             data_size = avio_rb32(pb);

  864.             chunk_id2 = avio_rl32(pb);

  865. 

  866.             if (chunk_id  == ID_FORM &&

  867.                 chunk_id2 == ID_ILBM) {

  868.                 avio_skip(pb, -4);

  869.                 break;

  870.             } else if (chunk_id == ID_FORM &&

  871.                        chunk_id2 == ID_ANIM) {

  872.                 continue;

  873.             } else {

  874.                 avio_skip(pb, data_size);

  875.             }

  876.         }

  877.         ret = av_get_packet(pb, pkt, data_size);

  878.         pkt->pos = orig_pos;

  879.         pkt->duration = get_anim_duration(pkt->data, pkt->size);

  880.         if (pos == 12)

  881.             pkt->flags |= AV_PKT_FLAG_KEY;

  882.     } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&

  883.                st->codecpar->codec_tag  != ID_ANIM) {

  884.         if (iff->body_size > INT_MAX || !iff->body_size)

  885.             return AVERROR_INVALIDDATA;

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

  887.         pkt->pos = pos;

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

  889.             pkt->flags |= AV_PKT_FLAG_KEY;

  890.     } else {

  891.         av_assert0(0);

  892.     }

  893. 

  894.     if (ret < 0)

  895.         return ret;

  896.     pkt->stream_index = 0;

  897.     return ret;

  898. }

  899. 

  900. AVInputFormat ff_iff_demuxer = {

  901.     .name           = "iff",

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

  903.     .priv_data_size = sizeof(IffDemuxContext),

  904.     .read_probe     = iff_probe,

  905.     .read_header    = iff_read_header,

  906.     .read_packet    = iff_read_packet,

  907.     .flags          = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,

  908. };