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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 | +}; |