| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * PGX image format | ||
| 3 | * Copyright (c) 2020 Gautam Ramakrishnan | ||
| 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 "avcodec.h" | ||
| 23 | #include "bytestream.h" | ||
| 24 | #include "codec_internal.h" | ||
| 25 | #include "decode.h" | ||
| 26 | |||
| 27 | ✗ | static int pgx_get_number(AVCodecContext *avctx, GetByteContext *g, int *number) { | |
| 28 | ✗ | int ret = AVERROR_INVALIDDATA; | |
| 29 | char digit; | ||
| 30 | |||
| 31 | ✗ | *number = 0; | |
| 32 | ✗ | while (1) { | |
| 33 | uint64_t temp; | ||
| 34 | ✗ | if (bytestream2_get_bytes_left(g) <= 0) | |
| 35 | ✗ | return AVERROR_INVALIDDATA; | |
| 36 | ✗ | digit = bytestream2_get_byteu(g); | |
| 37 | ✗ | if (digit == ' ' || digit == 0xA || digit == 0xD) | |
| 38 | break; | ||
| 39 | ✗ | else if (digit < '0' || digit > '9') | |
| 40 | ✗ | return AVERROR_INVALIDDATA; | |
| 41 | |||
| 42 | ✗ | temp = (uint64_t)10 * (*number) + (digit - '0'); | |
| 43 | ✗ | if (temp > INT_MAX) | |
| 44 | ✗ | return AVERROR_INVALIDDATA; | |
| 45 | ✗ | *number = temp; | |
| 46 | ✗ | ret = 0; | |
| 47 | } | ||
| 48 | |||
| 49 | ✗ | return ret; | |
| 50 | } | ||
| 51 | |||
| 52 | ✗ | static int pgx_decode_header(AVCodecContext *avctx, GetByteContext *g, | |
| 53 | int *depth, int *width, int *height, | ||
| 54 | int *sign) | ||
| 55 | { | ||
| 56 | int byte; | ||
| 57 | |||
| 58 | ✗ | if (bytestream2_get_bytes_left(g) < 12) | |
| 59 | ✗ | return AVERROR_INVALIDDATA; | |
| 60 | |||
| 61 | ✗ | bytestream2_skipu(g, 6); | |
| 62 | |||
| 63 | // Is the component signed? | ||
| 64 | ✗ | byte = bytestream2_peek_byteu(g); | |
| 65 | ✗ | if (byte == '+') { | |
| 66 | ✗ | *sign = 0; | |
| 67 | ✗ | bytestream2_skipu(g, 1); | |
| 68 | ✗ | } else if (byte == '-') { | |
| 69 | ✗ | *sign = 1; | |
| 70 | ✗ | bytestream2_skipu(g, 1); | |
| 71 | } | ||
| 72 | |||
| 73 | ✗ | byte = bytestream2_peek_byteu(g); | |
| 74 | ✗ | if (byte == ' ') | |
| 75 | ✗ | bytestream2_skipu(g, 1); | |
| 76 | |||
| 77 | ✗ | if (pgx_get_number(avctx, g, depth)) | |
| 78 | ✗ | goto error; | |
| 79 | ✗ | if (pgx_get_number(avctx, g, width)) | |
| 80 | ✗ | goto error; | |
| 81 | ✗ | if (pgx_get_number(avctx, g, height)) | |
| 82 | ✗ | goto error; | |
| 83 | |||
| 84 | ✗ | if (bytestream2_peek_byte(g) == 0xA) | |
| 85 | ✗ | bytestream2_skip(g, 1); | |
| 86 | ✗ | return 0; | |
| 87 | |||
| 88 | ✗ | error: | |
| 89 | ✗ | av_log(avctx, AV_LOG_ERROR, "Error in decoding header.\n"); | |
| 90 | ✗ | return AVERROR_INVALIDDATA; | |
| 91 | } | ||
| 92 | |||
| 93 | #define WRITE_FRAME(D, PIXEL, suffix) \ | ||
| 94 | static inline void write_frame_ ##D(AVFrame *frame, GetByteContext *g, \ | ||
| 95 | int width, int height, int sign, int depth) \ | ||
| 96 | { \ | ||
| 97 | const unsigned offset = sign ? (1 << (D - 1)) : 0; \ | ||
| 98 | int i, j; \ | ||
| 99 | for (i = 0; i < height; i++) { \ | ||
| 100 | PIXEL *line = (PIXEL*)(frame->data[0] + i * frame->linesize[0]); \ | ||
| 101 | for (j = 0; j < width; j++) { \ | ||
| 102 | unsigned val = bytestream2_get_ ##suffix##u(g) << (D - depth); \ | ||
| 103 | val ^= offset; \ | ||
| 104 | *(line + j) = val; \ | ||
| 105 | } \ | ||
| 106 | } \ | ||
| 107 | } \ | ||
| 108 | |||
| 109 | ✗ | WRITE_FRAME(8, uint8_t, byte) | |
| 110 | ✗ | WRITE_FRAME(16, uint16_t, be16) | |
| 111 | |||
| 112 | ✗ | static int pgx_decode_frame(AVCodecContext *avctx, AVFrame *p, | |
| 113 | int *got_frame, AVPacket *avpkt) | ||
| 114 | { | ||
| 115 | int ret; | ||
| 116 | int bpp; | ||
| 117 | int width, height, depth; | ||
| 118 | ✗ | int sign = 0; | |
| 119 | GetByteContext g; | ||
| 120 | ✗ | bytestream2_init(&g, avpkt->data, avpkt->size); | |
| 121 | |||
| 122 | ✗ | if ((ret = pgx_decode_header(avctx, &g, &depth, &width, &height, &sign)) < 0) | |
| 123 | ✗ | return ret; | |
| 124 | |||
| 125 | ✗ | if ((ret = ff_set_dimensions(avctx, width, height)) < 0) | |
| 126 | ✗ | return ret; | |
| 127 | |||
| 128 | ✗ | if (depth > 0 && depth <= 8) { | |
| 129 | ✗ | avctx->pix_fmt = AV_PIX_FMT_GRAY8; | |
| 130 | ✗ | bpp = 8; | |
| 131 | ✗ | } else if (depth > 0 && depth <= 16) { | |
| 132 | ✗ | avctx->pix_fmt = AV_PIX_FMT_GRAY16; | |
| 133 | ✗ | bpp = 16; | |
| 134 | } else { | ||
| 135 | ✗ | av_log(avctx, AV_LOG_ERROR, "depth %d is invalid or unsupported.\n", depth); | |
| 136 | ✗ | return AVERROR_PATCHWELCOME; | |
| 137 | } | ||
| 138 | ✗ | if (bytestream2_get_bytes_left(&g) < width * height * (bpp >> 3)) | |
| 139 | ✗ | return AVERROR_INVALIDDATA; | |
| 140 | ✗ | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) | |
| 141 | ✗ | return ret; | |
| 142 | ✗ | avctx->bits_per_raw_sample = depth; | |
| 143 | ✗ | if (bpp == 8) | |
| 144 | ✗ | write_frame_8(p, &g, width, height, sign, depth); | |
| 145 | ✗ | else if (bpp == 16) | |
| 146 | ✗ | write_frame_16(p, &g, width, height, sign, depth); | |
| 147 | ✗ | *got_frame = 1; | |
| 148 | ✗ | return 0; | |
| 149 | } | ||
| 150 | |||
| 151 | const FFCodec ff_pgx_decoder = { | ||
| 152 | .p.name = "pgx", | ||
| 153 | CODEC_LONG_NAME("PGX (JPEG2000 Test Format)"), | ||
| 154 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 155 | .p.id = AV_CODEC_ID_PGX, | ||
| 156 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 157 | FF_CODEC_DECODE_CB(pgx_decode_frame), | ||
| 158 | }; | ||
| 159 |