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"
47 typedef struct RpzaContext {
49 AVCodecContext *avctx;
55 #define ADVANCE_BLOCK() \
58 if (pixel_ptr >= width) \
61 row_ptr += stride * 4; \
64 if (total_blocks < 0) \
66 av_log(s->avctx, AV_LOG_ERROR, "warning: block counter just went negative (this should not happen)\n"); \
71 static void rpza_decode_stream(RpzaContext *s)
73 int width = s->avctx->width;
74 int stride = s->frame->linesize[0] / 2;
75 int row_inc = stride - 4;
77 uint16_t colorA = 0, colorB;
80 uint16_t *pixels = (uint16_t *)s->frame->data[0];
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));
93 /* Get chunk size, ingnoring first byte */
94 chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;
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",
101 bytestream2_get_bytes_left(&s->gb) + 4
104 /* Number of 4x4 blocks in frame. */
105 total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
107 /* Process chunk data */
108 while (bytestream2_get_bytes_left(&s->gb)) {
109 uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */
111 int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
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);
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
126 n_blocks = FFMIN(n_blocks, total_blocks);
128 switch (opcode & 0xe0) {
137 /* Fill blocks with one color */
139 colorA = bytestream2_get_be16(&s->gb);
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;
148 block_ptr += row_inc;
153 /* Fill blocks with 4 colors */
155 colorA = bytestream2_get_be16(&s->gb);
157 colorB = bytestream2_get_be16(&s->gb);
159 /* sort out the colors */
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;
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;
177 /* blue components */
180 color4[1] |= ((11 * ta + 21 * tb) >> 5);
181 color4[2] |= ((21 * ta + 11 * tb) >> 5);
183 if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
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];
195 block_ptr += row_inc;
200 /* Fill block with 16 colors */
202 if (bytestream2_get_bytes_left(&s->gb) < 30)
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;
214 block_ptr += row_inc;
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));
224 } /* Opcode switch */
228 static av_cold int rpza_decode_init(AVCodecContext *avctx)
230 RpzaContext *s = avctx->priv_data;
233 avctx->pix_fmt = AV_PIX_FMT_RGB555;
235 s->frame = av_frame_alloc();
237 return AVERROR(ENOMEM);
242 static int rpza_decode_frame(AVCodecContext *avctx,
243 void *data, int *got_frame,
246 RpzaContext *s = avctx->priv_data;
249 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
251 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
254 rpza_decode_stream(s);
256 if ((ret = av_frame_ref(data, s->frame)) < 0)
261 /* always report that the buffer was completely consumed */
265 static av_cold int rpza_decode_end(AVCodecContext *avctx)
267 RpzaContext *s = avctx->priv_data;
269 av_frame_free(&s->frame);
274 AVCodec ff_rpza_decoder = {
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 = AV_CODEC_CAP_DR1,