2 * Quicktime Video (RPZA) Video Decoder
3 * Copyright (C) 2003 The FFmpeg project
5 * This file is part of FFmpeg.
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.
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.
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
24 * QT RPZA Video Decoder by Roberto Togni
25 * For more information about the RPZA format, visit:
26 * http://www.pcisys.net/~melanson/codecs/
28 * The RPZA decoder outputs RGB555 colorspace data.
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.
42 #include "libavutil/internal.h"
44 #include "bytestream.h"
45 #include "codec_internal.h"
48 typedef struct RpzaContext {
50 AVCodecContext *avctx;
56 #define CHECK_BLOCK() \
57 if (total_blocks < 1) { \
58 av_log(s->avctx, AV_LOG_ERROR, \
59 "Block counter just went negative (this should not happen)\n"); \
60 return AVERROR_INVALIDDATA; \
63 #define ADVANCE_BLOCK() \
66 if (pixel_ptr >= width) \
69 row_ptr += stride * 4; \
74 static int rpza_decode_stream(RpzaContext *s)
76 int width = s->avctx->width;
77 int stride, row_inc, ret;
79 uint16_t colorA = 0, colorB;
90 /* First byte is always 0xe1. Warn if it's different */
91 if (bytestream2_peek_byte(&s->gb) != 0xe1)
92 av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
93 bytestream2_peek_byte(&s->gb));
95 /* Get chunk size, ignoring first byte */
96 chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;
98 /* If length mismatch use size from MOV file and try to decode anyway */
99 if (chunk_size != bytestream2_get_bytes_left(&s->gb) + 4)
100 av_log(s->avctx, AV_LOG_WARNING,
101 "MOV chunk size %d != encoded chunk size %d\n",
103 bytestream2_get_bytes_left(&s->gb) + 4
106 /* Number of 4x4 blocks in frame. */
107 total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
109 if (total_blocks / 32 > bytestream2_get_bytes_left(&s->gb))
110 return AVERROR_INVALIDDATA;
112 if ((ret = ff_reget_buffer(s->avctx, s->frame, 0)) < 0)
114 pixels = (uint16_t *)s->frame->data[0];
115 stride = s->frame->linesize[0] / 2;
116 row_inc = stride - 4;
118 /* Process chunk data */
119 while (bytestream2_get_bytes_left(&s->gb)) {
120 uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */
122 int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
124 /* If opcode MSbit is 0, we need more data to decide what to do */
125 if ((opcode & 0x80) == 0) {
126 colorA = (opcode << 8) | bytestream2_get_byte(&s->gb);
128 if ((bytestream2_peek_byte(&s->gb) & 0x80) != 0) {
129 /* Must behave as opcode 110xxxxx, using colorA computed
130 * above. Use fake opcode 0x20 to enter switch block at
137 n_blocks = FFMIN(n_blocks, total_blocks);
139 switch (opcode & 0xe0) {
149 /* Fill blocks with one color */
151 colorA = bytestream2_get_be16(&s->gb);
154 block_ptr = row_ptr + pixel_ptr;
155 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
156 for (pixel_x = 0; pixel_x < 4; pixel_x++){
157 pixels[block_ptr] = colorA;
160 block_ptr += row_inc;
166 /* Fill blocks with 4 colors */
168 colorA = bytestream2_get_be16(&s->gb);
170 colorB = bytestream2_get_be16(&s->gb);
172 /* sort out the colors */
179 ta = (colorA >> 10) & 0x1F;
180 tb = (colorB >> 10) & 0x1F;
181 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
182 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
184 /* green components */
185 ta = (colorA >> 5) & 0x1F;
186 tb = (colorB >> 5) & 0x1F;
187 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
188 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
190 /* blue components */
193 color4[1] |= ((11 * ta + 21 * tb) >> 5);
194 color4[2] |= ((21 * ta + 11 * tb) >> 5);
196 if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
197 return AVERROR_INVALIDDATA;
200 block_ptr = row_ptr + pixel_ptr;
201 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
202 uint8_t index = bytestream2_get_byteu(&s->gb);
203 for (pixel_x = 0; pixel_x < 4; pixel_x++){
204 uint8_t idx = (index >> (2 * (3 - pixel_x))) & 0x03;
205 pixels[block_ptr] = color4[idx];
208 block_ptr += row_inc;
214 /* Fill block with 16 colors */
216 if (bytestream2_get_bytes_left(&s->gb) < 30)
217 return AVERROR_INVALIDDATA;
219 block_ptr = row_ptr + pixel_ptr;
220 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
221 for (pixel_x = 0; pixel_x < 4; pixel_x++){
222 /* We already have color of upper left pixel */
223 if ((pixel_y != 0) || (pixel_x != 0))
224 colorA = bytestream2_get_be16u(&s->gb);
225 pixels[block_ptr] = colorA;
228 block_ptr += row_inc;
235 av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
236 " Skip remaining %d bytes of chunk data.\n", opcode,
237 bytestream2_get_bytes_left(&s->gb));
238 return AVERROR_INVALIDDATA;
239 } /* Opcode switch */
245 static av_cold int rpza_decode_init(AVCodecContext *avctx)
247 RpzaContext *s = avctx->priv_data;
250 avctx->pix_fmt = AV_PIX_FMT_RGB555;
252 s->frame = av_frame_alloc();
254 return AVERROR(ENOMEM);
259 static int rpza_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
260 int *got_frame, AVPacket *avpkt)
262 RpzaContext *s = avctx->priv_data;
265 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
267 ret = rpza_decode_stream(s);
271 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
276 /* always report that the buffer was completely consumed */
280 static av_cold int rpza_decode_end(AVCodecContext *avctx)
282 RpzaContext *s = avctx->priv_data;
284 av_frame_free(&s->frame);
289 const FFCodec ff_rpza_decoder = {
291 .p.long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
292 .p.type = AVMEDIA_TYPE_VIDEO,
293 .p.id = AV_CODEC_ID_RPZA,
294 .priv_data_size = sizeof(RpzaContext),
295 .init = rpza_decode_init,
296 .close = rpza_decode_end,
297 FF_CODEC_DECODE_CB(rpza_decode_frame),
298 .p.capabilities = AV_CODEC_CAP_DR1,
299 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,