| 1 | /* |
| 2 | * Quicktime Video (RPZA) Video Decoder |
| 3 | * Copyright (c) 2003 The FFmpeg Project |
| 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 | /** |
| 23 | * @file |
| 24 | * QT RPZA Video Decoder by Roberto Togni |
| 25 | * For more information about the RPZA format, visit: |
| 26 | * http://www.pcisys.net/~melanson/codecs/ |
| 27 | * |
| 28 | * The RPZA decoder outputs RGB555 colorspace data. |
| 29 | * |
| 30 | * Note that this decoder reads big endian RGB555 pixel values from the |
| 31 | * bytestream, arranges them in the host's endian order, and outputs |
| 32 | * them to the final rendered map in the same host endian order. This is |
| 33 | * intended behavior as the libavcodec documentation states that RGB555 |
| 34 | * pixels shall be stored in native CPU endianness. |
| 35 | */ |
| 36 | |
| 37 | #include <stdint.h> |
| 38 | #include <stdio.h> |
| 39 | #include <stdlib.h> |
| 40 | #include <string.h> |
| 41 | |
| 42 | #include "libavutil/internal.h" |
| 43 | #include "avcodec.h" |
| 44 | #include "bytestream.h" |
| 45 | #include "internal.h" |
| 46 | |
| 47 | typedef struct RpzaContext { |
| 48 | |
| 49 | AVCodecContext *avctx; |
| 50 | AVFrame *frame; |
| 51 | |
| 52 | GetByteContext gb; |
| 53 | } RpzaContext; |
| 54 | |
| 55 | #define ADVANCE_BLOCK() \ |
| 56 | { \ |
| 57 | pixel_ptr += 4; \ |
| 58 | if (pixel_ptr >= width) \ |
| 59 | { \ |
| 60 | pixel_ptr = 0; \ |
| 61 | row_ptr += stride * 4; \ |
| 62 | } \ |
| 63 | total_blocks--; \ |
| 64 | if (total_blocks < 0) \ |
| 65 | { \ |
| 66 | av_log(s->avctx, AV_LOG_ERROR, "warning: block counter just went negative (this should not happen)\n"); \ |
| 67 | return; \ |
| 68 | } \ |
| 69 | } |
| 70 | |
| 71 | static void rpza_decode_stream(RpzaContext *s) |
| 72 | { |
| 73 | int width = s->avctx->width; |
| 74 | int stride = s->frame->linesize[0] / 2; |
| 75 | int row_inc = stride - 4; |
| 76 | int chunk_size; |
| 77 | uint16_t colorA = 0, colorB; |
| 78 | uint16_t color4[4]; |
| 79 | uint16_t ta, tb; |
| 80 | uint16_t *pixels = (uint16_t *)s->frame->data[0]; |
| 81 | |
| 82 | int row_ptr = 0; |
| 83 | int pixel_ptr = -4; |
| 84 | int block_ptr; |
| 85 | int pixel_x, pixel_y; |
| 86 | int total_blocks; |
| 87 | |
| 88 | /* First byte is always 0xe1. Warn if it's different */ |
| 89 | if (bytestream2_peek_byte(&s->gb) != 0xe1) |
| 90 | av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n", |
| 91 | bytestream2_peek_byte(&s->gb)); |
| 92 | |
| 93 | /* Get chunk size, ingnoring first byte */ |
| 94 | chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF; |
| 95 | |
| 96 | /* If length mismatch use size from MOV file and try to decode anyway */ |
| 97 | if (chunk_size != bytestream2_get_bytes_left(&s->gb) + 4) |
| 98 | av_log(s->avctx, AV_LOG_WARNING, |
| 99 | "MOV chunk size %d != encoded chunk size %d\n", |
| 100 | chunk_size, |
| 101 | bytestream2_get_bytes_left(&s->gb) + 4 |
| 102 | ); |
| 103 | |
| 104 | /* Number of 4x4 blocks in frame. */ |
| 105 | total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4); |
| 106 | |
| 107 | /* Process chunk data */ |
| 108 | while (bytestream2_get_bytes_left(&s->gb)) { |
| 109 | uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */ |
| 110 | |
| 111 | int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */ |
| 112 | |
| 113 | /* If opcode MSbit is 0, we need more data to decide what to do */ |
| 114 | if ((opcode & 0x80) == 0) { |
| 115 | colorA = (opcode << 8) | bytestream2_get_byte(&s->gb); |
| 116 | opcode = 0; |
| 117 | if ((bytestream2_peek_byte(&s->gb) & 0x80) != 0) { |
| 118 | /* Must behave as opcode 110xxxxx, using colorA computed |
| 119 | * above. Use fake opcode 0x20 to enter switch block at |
| 120 | * the right place */ |
| 121 | opcode = 0x20; |
| 122 | n_blocks = 1; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | n_blocks = FFMIN(n_blocks, total_blocks); |
| 127 | |
| 128 | switch (opcode & 0xe0) { |
| 129 | |
| 130 | /* Skip blocks */ |
| 131 | case 0x80: |
| 132 | while (n_blocks--) { |
| 133 | ADVANCE_BLOCK(); |
| 134 | } |
| 135 | break; |
| 136 | |
| 137 | /* Fill blocks with one color */ |
| 138 | case 0xa0: |
| 139 | colorA = bytestream2_get_be16(&s->gb); |
| 140 | while (n_blocks--) { |
| 141 | ADVANCE_BLOCK() |
| 142 | block_ptr = row_ptr + pixel_ptr; |
| 143 | for (pixel_y = 0; pixel_y < 4; pixel_y++) { |
| 144 | for (pixel_x = 0; pixel_x < 4; pixel_x++){ |
| 145 | pixels[block_ptr] = colorA; |
| 146 | block_ptr++; |
| 147 | } |
| 148 | block_ptr += row_inc; |
| 149 | } |
| 150 | } |
| 151 | break; |
| 152 | |
| 153 | /* Fill blocks with 4 colors */ |
| 154 | case 0xc0: |
| 155 | colorA = bytestream2_get_be16(&s->gb); |
| 156 | case 0x20: |
| 157 | colorB = bytestream2_get_be16(&s->gb); |
| 158 | |
| 159 | /* sort out the colors */ |
| 160 | color4[0] = colorB; |
| 161 | color4[1] = 0; |
| 162 | color4[2] = 0; |
| 163 | color4[3] = colorA; |
| 164 | |
| 165 | /* red components */ |
| 166 | ta = (colorA >> 10) & 0x1F; |
| 167 | tb = (colorB >> 10) & 0x1F; |
| 168 | color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10; |
| 169 | color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10; |
| 170 | |
| 171 | /* green components */ |
| 172 | ta = (colorA >> 5) & 0x1F; |
| 173 | tb = (colorB >> 5) & 0x1F; |
| 174 | color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5; |
| 175 | color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5; |
| 176 | |
| 177 | /* blue components */ |
| 178 | ta = colorA & 0x1F; |
| 179 | tb = colorB & 0x1F; |
| 180 | color4[1] |= ((11 * ta + 21 * tb) >> 5); |
| 181 | color4[2] |= ((21 * ta + 11 * tb) >> 5); |
| 182 | |
| 183 | if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4) |
| 184 | return; |
| 185 | while (n_blocks--) { |
| 186 | ADVANCE_BLOCK(); |
| 187 | block_ptr = row_ptr + pixel_ptr; |
| 188 | for (pixel_y = 0; pixel_y < 4; pixel_y++) { |
| 189 | uint8_t index = bytestream2_get_byteu(&s->gb); |
| 190 | for (pixel_x = 0; pixel_x < 4; pixel_x++){ |
| 191 | uint8_t idx = (index >> (2 * (3 - pixel_x))) & 0x03; |
| 192 | pixels[block_ptr] = color4[idx]; |
| 193 | block_ptr++; |
| 194 | } |
| 195 | block_ptr += row_inc; |
| 196 | } |
| 197 | } |
| 198 | break; |
| 199 | |
| 200 | /* Fill block with 16 colors */ |
| 201 | case 0x00: |
| 202 | if (bytestream2_get_bytes_left(&s->gb) < 30) |
| 203 | return; |
| 204 | ADVANCE_BLOCK(); |
| 205 | block_ptr = row_ptr + pixel_ptr; |
| 206 | for (pixel_y = 0; pixel_y < 4; pixel_y++) { |
| 207 | for (pixel_x = 0; pixel_x < 4; pixel_x++){ |
| 208 | /* We already have color of upper left pixel */ |
| 209 | if ((pixel_y != 0) || (pixel_x != 0)) |
| 210 | colorA = bytestream2_get_be16u(&s->gb); |
| 211 | pixels[block_ptr] = colorA; |
| 212 | block_ptr++; |
| 213 | } |
| 214 | block_ptr += row_inc; |
| 215 | } |
| 216 | break; |
| 217 | |
| 218 | /* Unknown opcode */ |
| 219 | default: |
| 220 | av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk." |
| 221 | " Skip remaining %d bytes of chunk data.\n", opcode, |
| 222 | bytestream2_get_bytes_left(&s->gb)); |
| 223 | return; |
| 224 | } /* Opcode switch */ |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | static av_cold int rpza_decode_init(AVCodecContext *avctx) |
| 229 | { |
| 230 | RpzaContext *s = avctx->priv_data; |
| 231 | |
| 232 | s->avctx = avctx; |
| 233 | avctx->pix_fmt = AV_PIX_FMT_RGB555; |
| 234 | |
| 235 | s->frame = av_frame_alloc(); |
| 236 | if (!s->frame) |
| 237 | return AVERROR(ENOMEM); |
| 238 | |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static int rpza_decode_frame(AVCodecContext *avctx, |
| 243 | void *data, int *got_frame, |
| 244 | AVPacket *avpkt) |
| 245 | { |
| 246 | RpzaContext *s = avctx->priv_data; |
| 247 | int ret; |
| 248 | |
| 249 | bytestream2_init(&s->gb, avpkt->data, avpkt->size); |
| 250 | |
| 251 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
| 252 | return ret; |
| 253 | |
| 254 | rpza_decode_stream(s); |
| 255 | |
| 256 | if ((ret = av_frame_ref(data, s->frame)) < 0) |
| 257 | return ret; |
| 258 | |
| 259 | *got_frame = 1; |
| 260 | |
| 261 | /* always report that the buffer was completely consumed */ |
| 262 | return avpkt->size; |
| 263 | } |
| 264 | |
| 265 | static av_cold int rpza_decode_end(AVCodecContext *avctx) |
| 266 | { |
| 267 | RpzaContext *s = avctx->priv_data; |
| 268 | |
| 269 | av_frame_free(&s->frame); |
| 270 | |
| 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | AVCodec ff_rpza_decoder = { |
| 275 | .name = "rpza", |
| 276 | .long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"), |
| 277 | .type = AVMEDIA_TYPE_VIDEO, |
| 278 | .id = AV_CODEC_ID_RPZA, |
| 279 | .priv_data_size = sizeof(RpzaContext), |
| 280 | .init = rpza_decode_init, |
| 281 | .close = rpza_decode_end, |
| 282 | .decode = rpza_decode_frame, |
| 283 | .capabilities = CODEC_CAP_DR1, |
| 284 | }; |