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FFmpeg/libavcodec/dpx.c

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  1. /*

  2.  * DPX (.dpx) image decoder

  3.  * Copyright (c) 2009 Jimmy Christensen

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. #include "libavutil/intreadwrite.h"

  23. #include "libavutil/intfloat.h"

  24. #include "libavutil/imgutils.h"

  25. #include "bytestream.h"

  26. #include "avcodec.h"

  27. #include "internal.h"

  28. 

  29. static unsigned int read16(const uint8_t **ptr, int is_big)

  30. {

  31.     unsigned int temp;

  32.     if (is_big) {

  33.         temp = AV_RB16(*ptr);

  34.     } else {

  35.         temp = AV_RL16(*ptr);

  36.     }

  37.     *ptr += 2;

  38.     return temp;

  39. }

  40. 

  41. static unsigned int read32(const uint8_t **ptr, int is_big)

  42. {

  43.     unsigned int temp;

  44.     if (is_big) {

  45.         temp = AV_RB32(*ptr);

  46.     } else {

  47.         temp = AV_RL32(*ptr);

  48.     }

  49.     *ptr += 4;

  50.     return temp;

  51. }

  52. 

  53. static uint16_t read10in32(const uint8_t **ptr, uint32_t * lbuf,

  54.                                   int * n_datum, int is_big)

  55. {

  56.     if (*n_datum)

  57.         (*n_datum)--;

  58.     else {

  59.         *lbuf = read32(ptr, is_big);

  60.         *n_datum = 2;

  61.     }

  62. 

  63.     *lbuf = (*lbuf << 10) | (*lbuf >> 22);

  64. 

  65.     return *lbuf & 0x3FF;

  66. }

  67. 

  68. static int decode_frame(AVCodecContext *avctx,

  69.                         void *data,

  70.                         int *got_frame,

  71.                         AVPacket *avpkt)

  72. {

  73.     const uint8_t *buf = avpkt->data;

  74.     int buf_size       = avpkt->size;

  75.     AVFrame *const p = data;

  76.     uint8_t *ptr[AV_NUM_DATA_POINTERS];

  77. 

  78.     unsigned int offset;

  79.     int magic_num, endian;

  80.     int x, y, stride, i, ret;

  81.     int w, h, bits_per_color, descriptor, elements, packing;

  82.     int encoding, need_align = 0;

  83. 

  84.     unsigned int rgbBuffer = 0;

  85.     int n_datum = 0;

  86. 

  87.     if (avpkt->size <= 1634) {

  88.         av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");

  89.         return AVERROR_INVALIDDATA;

  90.     }

  91. 

  92.     magic_num = AV_RB32(buf);

  93.     buf += 4;

  94. 

  95.     /* Check if the files "magic number" is "SDPX" which means it uses

  96.      * big-endian or XPDS which is for little-endian files */

  97.     if (magic_num == AV_RL32("SDPX")) {

  98.         endian = 0;

  99.     } else if (magic_num == AV_RB32("SDPX")) {

  100.         endian = 1;

  101.     } else {

  102.         av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");

  103.         return AVERROR_INVALIDDATA;

  104.     }

  105. 

  106.     offset = read32(&buf, endian);

  107.     if (avpkt->size <= offset) {

  108.         av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n");

  109.         return AVERROR_INVALIDDATA;

  110.     }

  111. 

  112.     // Check encryption

  113.     buf = avpkt->data + 660;

  114.     ret = read32(&buf, endian);

  115.     if (ret != 0xFFFFFFFF) {

  116.         avpriv_report_missing_feature(avctx, "Encryption");

  117.         av_log(avctx, AV_LOG_WARNING, "The image is encrypted and may "

  118.                "not properly decode.\n");

  119.     }

  120. 

  121.     // Need to end in 0x304 offset from start of file

  122.     buf = avpkt->data + 0x304;

  123.     w = read32(&buf, endian);

  124.     h = read32(&buf, endian);

  125. 

  126.     if ((ret = ff_set_dimensions(avctx, w, h)) < 0)

  127.         return ret;

  128. 

  129.     // Need to end in 0x320 to read the descriptor

  130.     buf += 20;

  131.     descriptor = buf[0];

  132. 

  133.     // Need to end in 0x323 to read the bits per color

  134.     buf += 3;

  135.     avctx->bits_per_raw_sample =

  136.     bits_per_color = buf[0];

  137.     buf++;

  138.     packing = read16(&buf, endian);

  139.     encoding = read16(&buf, endian);

  140. 

  141.     if (packing > 1) {

  142.         avpriv_report_missing_feature(avctx, "Packing %d", packing);

  143.         return AVERROR_PATCHWELCOME;

  144.     }

  145.     if (encoding) {

  146.         avpriv_report_missing_feature(avctx, "Encoding %d", encoding);

  147.         return AVERROR_PATCHWELCOME;

  148.     }

  149. 

  150.     buf += 820;

  151.     avctx->sample_aspect_ratio.num = read32(&buf, endian);

  152.     avctx->sample_aspect_ratio.den = read32(&buf, endian);

  153.     if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0)

  154.         av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den,

  155.                    avctx->sample_aspect_ratio.num,  avctx->sample_aspect_ratio.den,

  156.                   0x10000);

  157.     else

  158.         avctx->sample_aspect_ratio = (AVRational){ 0, 1 };

  159. 

  160.     if (offset >= 1724 + 4) {

  161.         buf = avpkt->data + 1724;

  162.         i = read32(&buf, endian);

  163.         if(i) {

  164.             AVRational q = av_d2q(av_int2float(i), 4096);

  165.             if (q.num > 0 && q.den > 0)

  166.                 avctx->framerate = q;

  167.         }

  168.     }

  169. 

  170.     switch (descriptor) {

  171.     case 6:  // Y

  172.         elements = 1;

  173.         break;

  174.     case 52: // ABGR

  175.     case 51: // RGBA

  176.     case 103: // UYVA4444

  177.         elements = 4;

  178.         break;

  179.     case 50: // RGB

  180.     case 102: // UYV444

  181.         elements = 3;

  182.         break;

  183.     case 100: // UYVY422

  184.         elements = 2;

  185.         break;

  186.     default:

  187.         avpriv_report_missing_feature(avctx, "Descriptor %d", descriptor);

  188.         return AVERROR_PATCHWELCOME;

  189.     }

  190. 

  191.     switch (bits_per_color) {

  192.     case 8:

  193.         stride = avctx->width * elements;

  194.         break;

  195.     case 10:

  196.         if (!packing) {

  197.             av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n");

  198.             return -1;

  199.         }

  200.         stride = (avctx->width * elements + 2) / 3 * 4;

  201.         break;

  202.     case 12:

  203.         if (!packing) {

  204.             av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n");

  205.             return -1;

  206.         }

  207.         stride = 2 * avctx->width * elements;

  208.         break;

  209.     case 16:

  210.         stride = 2 * avctx->width * elements;

  211.         break;

  212.     case 1:

  213.     case 32:

  214.     case 64:

  215.         avpriv_report_missing_feature(avctx, "Depth %d", bits_per_color);

  216.         return AVERROR_PATCHWELCOME;

  217.     default:

  218.         return AVERROR_INVALIDDATA;

  219.     }

  220. 

  221.     // Table 3c: Runs will always break at scan line boundaries. Packing

  222.     // will always break to the next 32-bit word at scan-line boundaries.

  223.     // Unfortunately, the encoder produced invalid files, so attempt

  224.     // to detect it

  225.     need_align = FFALIGN(stride, 4);

  226.     if (need_align*avctx->height + (int64_t)offset > avpkt->size) {

  227.         // Alignment seems unappliable, try without

  228.         if (stride*avctx->height + (int64_t)offset > avpkt->size) {

  229.             av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");

  230.             return AVERROR_INVALIDDATA;

  231.         } else {

  232.             av_log(avctx, AV_LOG_INFO, "Decoding DPX without scanline "

  233.                    "alignment.\n");

  234.             need_align = 0;

  235.         }

  236.     } else {

  237.         need_align -= stride;

  238.         stride = FFALIGN(stride, 4);

  239.     }

  240. 

  241.     switch (1000 * descriptor + 10 * bits_per_color + endian) {

  242.     case 6081:

  243.     case 6080:

  244.         avctx->pix_fmt = AV_PIX_FMT_GRAY8;

  245.         break;

  246.     case 50081:

  247.     case 50080:

  248.         avctx->pix_fmt = AV_PIX_FMT_RGB24;

  249.         break;

  250.     case 52081:

  251.     case 52080:

  252.         avctx->pix_fmt = AV_PIX_FMT_ABGR;

  253.         break;

  254.     case 51081:

  255.     case 51080:

  256.         avctx->pix_fmt = AV_PIX_FMT_RGBA;

  257.         break;

  258.     case 50100:

  259.     case 51100:

  260.     case 50101:

  261.     case 51101:

  262.         avctx->pix_fmt = AV_PIX_FMT_GBRP10;

  263.         break;

  264.     case 50120:

  265.     case 51120:

  266.     case 50121:

  267.     case 51121:

  268.         avctx->pix_fmt = AV_PIX_FMT_GBRP12;

  269.         break;

  270.     case 6161:

  271.         avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;

  272.         break;

  273.     case 6160:

  274.         avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;

  275.         break;

  276.     case 50161:

  277.         avctx->pix_fmt = AV_PIX_FMT_RGB48BE;

  278.         break;

  279.     case 50160:

  280.         avctx->pix_fmt = AV_PIX_FMT_RGB48LE;

  281.         break;

  282.     case 51161:

  283.         avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;

  284.         break;

  285.     case 51160:

  286.         avctx->pix_fmt = AV_PIX_FMT_RGBA64LE;

  287.         break;

  288.     case 100081:

  289.         avctx->pix_fmt = AV_PIX_FMT_UYVY422;

  290.         break;

  291.     case 102081:

  292.         avctx->pix_fmt = AV_PIX_FMT_YUV444P;

  293.         break;

  294.     case 103081:

  295.         avctx->pix_fmt = AV_PIX_FMT_YUVA444P;

  296.         break;

  297.     default:

  298.         av_log(avctx, AV_LOG_ERROR, "Unsupported format\n");

  299.         return AVERROR_PATCHWELCOME;

  300.     }

  301. 

  302.     ff_set_sar(avctx, avctx->sample_aspect_ratio);

  303. 

  304.     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)

  305.         return ret;

  306. 

  307.     // Move pointer to offset from start of file

  308.     buf =  avpkt->data + offset;

  309. 

  310.     for (i=0; i<AV_NUM_DATA_POINTERS; i++)

  311.         ptr[i] = p->data[i];

  312. 

  313.     switch (bits_per_color) {

  314.     case 10:

  315.         for (x = 0; x < avctx->height; x++) {

  316.             uint16_t *dst[3] = {(uint16_t*)ptr[0],

  317.                                 (uint16_t*)ptr[1],

  318.                                 (uint16_t*)ptr[2]};

  319.             for (y = 0; y < avctx->width; y++) {

  320.                 *dst[2]++ = read10in32(&buf, &rgbBuffer,

  321.                                        &n_datum, endian);

  322.                 *dst[0]++ = read10in32(&buf, &rgbBuffer,

  323.                                        &n_datum, endian);

  324.                 *dst[1]++ = read10in32(&buf, &rgbBuffer,

  325.                                        &n_datum, endian);

  326.                 // For 10 bit, ignore alpha

  327.                 if (elements == 4)

  328.                     read10in32(&buf, &rgbBuffer,

  329.                                &n_datum, endian);

  330.             }

  331.             n_datum = 0;

  332.             for (i = 0; i < 3; i++)

  333.                 ptr[i] += p->linesize[i];

  334.         }

  335.         break;

  336.     case 12:

  337.         for (x = 0; x < avctx->height; x++) {

  338.             uint16_t *dst[3] = {(uint16_t*)ptr[0],

  339.                                 (uint16_t*)ptr[1],

  340.                                 (uint16_t*)ptr[2]};

  341.             for (y = 0; y < avctx->width; y++) {

  342.                 *dst[2] = read16(&buf, endian) >> 4;

  343.                 dst[2]++;

  344.                 *dst[0] = read16(&buf, endian) >> 4;

  345.                 dst[0]++;

  346.                 *dst[1] = read16(&buf, endian) >> 4;

  347.                 dst[1]++;

  348.                 // For 12 bit, ignore alpha

  349.                 if (elements == 4)

  350.                     buf += 2;

  351.                 // Jump to next aligned position

  352.                 buf += need_align;

  353.             }

  354.             for (i = 0; i < 3; i++)

  355.                 ptr[i] += p->linesize[i];

  356.         }

  357.         break;

  358.     case 16:

  359.         elements *= 2;

  360.     case 8:

  361.         if (   avctx->pix_fmt == AV_PIX_FMT_YUVA444P

  362.             || avctx->pix_fmt == AV_PIX_FMT_YUV444P) {

  363.             for (x = 0; x < avctx->height; x++) {

  364.                 ptr[0] = p->data[0] + x * p->linesize[0];

  365.                 ptr[1] = p->data[1] + x * p->linesize[1];

  366.                 ptr[2] = p->data[2] + x * p->linesize[2];

  367.                 ptr[3] = p->data[3] + x * p->linesize[3];

  368.                 for (y = 0; y < avctx->width; y++) {

  369.                     *ptr[1]++ = *buf++;

  370.                     *ptr[0]++ = *buf++;

  371.                     *ptr[2]++ = *buf++;

  372.                     if (avctx->pix_fmt == AV_PIX_FMT_YUVA444P)

  373.                         *ptr[3]++ = *buf++;

  374.                 }

  375.             }

  376.         } else {

  377.         av_image_copy_plane(ptr[0], p->linesize[0],

  378.                             buf, stride,

  379.                             elements * avctx->width, avctx->height);

  380.         }

  381.         break;

  382.     }

  383. 

  384.     *got_frame = 1;

  385. 

  386.     return buf_size;

  387. }

  388. 

  389. AVCodec ff_dpx_decoder = {

  390.     .name           = "dpx",

  391.     .long_name      = NULL_IF_CONFIG_SMALL("DPX (Digital Picture Exchange) image"),

  392.     .type           = AVMEDIA_TYPE_VIDEO,

  393.     .id             = AV_CODEC_ID_DPX,

  394.     .decode         = decode_frame,

  395.     .capabilities   = AV_CODEC_CAP_DR1,

  396. };