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| | 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 "internal.h" |
| | 24 | #include "bytestream.h" |
| | 25 | #include "libavutil/imgutils.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)) |
| | 35 | return AVERROR_INVALIDDATA; |
| | 36 | digit = bytestream2_get_byte(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) < 6) { |
| | 59 | return AVERROR_INVALIDDATA; |
| | 60 | } |
| | 61 | |
| | 62 | bytestream2_skip(g, 6); |
| | 63 | |
| | 64 | // Is the component signed? |
| | 65 | byte = bytestream2_peek_byte(g); |
| | 66 | if (byte == '+') { |
| | 67 | *sign = 0; |
| | 68 | bytestream2_skip(g, 1); |
| | 69 | } else if (byte == '-') { |
| | 70 | *sign = 1; |
| | 71 | bytestream2_skip(g, 1); |
| | 72 | } else if (byte == 0) |
| | 73 | goto error; |
| | 74 | |
| | 75 | byte = bytestream2_peek_byte(g); |
| | 76 | if (byte == ' ') |
| | 77 | bytestream2_skip(g, 1); |
| | 78 | else if (byte == 0) |
| | 79 | goto error; |
| | 80 | |
| | 81 | if (pgx_get_number(avctx, g, depth)) |
| | 82 | goto error; |
| | 83 | if (pgx_get_number(avctx, g, width)) |
| | 84 | goto error; |
| | 85 | if (pgx_get_number(avctx, g, height)) |
| | 86 | goto error; |
| | 87 | |
| | 88 | if (bytestream2_peek_byte(g) == 0xA) |
| | 89 | bytestream2_skip(g, 1); |
| | 90 | return 0; |
| | 91 | |
| | 92 | error: |
| | 93 | av_log(avctx, AV_LOG_ERROR, "Error in decoding header.\n"); |
| | 94 | return AVERROR_INVALIDDATA; |
| | 95 | } |
| | 96 | |
| | 97 | #define WRITE_FRAME(D, PIXEL, suffix) \ |
| | 98 | static inline void write_frame_ ##D(AVPacket *avpkt, AVFrame *frame, GetByteContext *g, \ |
| | 99 | int width, int height, int sign, int depth) \ |
| | 100 | { \ |
| | 101 | int i, j; \ |
| | 102 | for (i = 0; i < height; i++) { \ |
| | 103 | PIXEL *line = (PIXEL*)frame->data[0] + i*frame->linesize[0]/sizeof(PIXEL); \ |
| | 104 | for (j = 0; j < width; j++) { \ |
| | 105 | int val; \ |
| | 106 | if (sign) \ |
| | 107 | val = (PIXEL)bytestream2_get_ ##suffix(g) + (1 << (depth - 1)); \ |
| | 108 | else \ |
| | 109 | val = bytestream2_get_ ##suffix(g); \ |
| | 110 | val <<= (D - depth); \ |
| | 111 | *(line + j) = val; \ |
| | 112 | } \ |
| | 113 | } \ |
| | 114 | } \ |
| | 115 | |
| | 116 | WRITE_FRAME(8, int8_t, byte) |
| | 117 | WRITE_FRAME(16, int16_t, be16) |
| | 118 | |
| | 119 | static int pgx_decode_frame(AVCodecContext *avctx, void *data, |
| | 120 | int *got_frame, AVPacket *avpkt) |
| | 121 | { |
| | 122 | AVFrame *p = data; |
| | 123 | int ret; |
| | 124 | int bpp; |
| | 125 | int width, height, depth; |
| | 126 | int sign = 0; |
| | 127 | GetByteContext g; |
| | 128 | bytestream2_init(&g, avpkt->data, avpkt->size); |
| | 129 | |
| | 130 | if ((ret = pgx_decode_header(avctx, &g, &depth, &width, &height, &sign)) < 0) |
| | 131 | return ret; |
| | 132 | |
| | 133 | if ((ret = ff_set_dimensions(avctx, width, height)) < 0) |
| | 134 | return ret; |
| | 135 | |
| | 136 | if (depth <= 8) { |
| | 137 | avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
| | 138 | bpp = 8; |
| | 139 | } else if (depth <= 16) { |
| | 140 | avctx->pix_fmt = AV_PIX_FMT_GRAY16BE; |
| | 141 | bpp = 16; |
| | 142 | } else { |
| | 143 | av_log(avctx, AV_LOG_ERROR, "Maximum depth of 16 bits supported.\n"); |
| | 144 | return AVERROR_PATCHWELCOME; |
| | 145 | } |
| | 146 | if (bytestream2_get_bytes_left(&g) < width * height * (bpp >> 3)) |
| | 147 | return AVERROR_INVALIDDATA; |
| | 148 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| | 149 | return ret; |
| | 150 | p->pict_type = AV_PICTURE_TYPE_I; |
| | 151 | p->key_frame = 1; |
| | 152 | avctx->bits_per_raw_sample = depth; |
| | 153 | if (bpp == 8) |
| | 154 | write_frame_8(avpkt, p, &g, width, height, sign, depth); |
| | 155 | else if (bpp == 16) |
| | 156 | write_frame_16(avpkt, p, &g, width, height, sign, depth); |
| | 157 | *got_frame = 1; |
| | 158 | return 0; |
| | 159 | } |
| | 160 | |
| | 161 | AVCodec ff_pgx_decoder = { |
| | 162 | .name = "pgx", |
| | 163 | .long_name = NULL_IF_CONFIG_SMALL("PGX (JPEG2000 Test Format)"), |
| | 164 | .type = AVMEDIA_TYPE_VIDEO, |
| | 165 | .id = AV_CODEC_ID_PGX, |
| | 166 | .decode = pgx_decode_frame, |
| | 167 | .capabilities = AV_CODEC_CAP_DR1, |
| | 168 | }; |