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.
41 #include "libavutil/internal.h"
42 #include "libavutil/intreadwrite.h"
46 typedef struct RpzaContext {
48 AVCodecContext *avctx;
51 const unsigned char *buf;
56 #define ADVANCE_BLOCK() \
59 if (pixel_ptr >= width) \
62 row_ptr += stride * 4; \
65 if (total_blocks < 0) \
67 av_log(s->avctx, AV_LOG_ERROR, "warning: block counter just went negative (this should not happen)\n"); \
72 static void rpza_decode_stream(RpzaContext *s)
74 int width = s->avctx->width;
75 int stride = s->frame.linesize[0] / 2;
76 int row_inc = stride - 4;
81 unsigned short colorA = 0, colorB;
82 unsigned short color4[4];
83 unsigned char index, idx;
84 unsigned short ta, tb;
85 unsigned short *pixels = (unsigned short *)s->frame.data[0];
93 /* First byte is always 0xe1. Warn if it's different */
94 if (s->buf[stream_ptr] != 0xe1)
95 av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
98 /* Get chunk size, ingnoring first byte */
99 chunk_size = AV_RB32(&s->buf[stream_ptr]) & 0x00FFFFFF;
102 /* If length mismatch use size from MOV file and try to decode anyway */
103 if (chunk_size != s->size)
104 av_log(s->avctx, AV_LOG_ERROR, "MOV chunk size != encoded chunk size; using MOV chunk size\n");
106 chunk_size = s->size;
108 /* Number of 4x4 blocks in frame. */
109 total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
111 /* Process chunk data */
112 while (stream_ptr < chunk_size) {
113 opcode = s->buf[stream_ptr++]; /* Get opcode */
115 n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
117 /* If opcode MSbit is 0, we need more data to decide what to do */
118 if ((opcode & 0x80) == 0) {
119 colorA = (opcode << 8) | (s->buf[stream_ptr++]);
121 if ((s->buf[stream_ptr] & 0x80) != 0) {
122 /* Must behave as opcode 110xxxxx, using colorA computed
123 * above. Use fake opcode 0x20 to enter switch block at
130 switch (opcode & 0xe0) {
139 /* Fill blocks with one color */
141 colorA = AV_RB16 (&s->buf[stream_ptr]);
144 block_ptr = row_ptr + pixel_ptr;
145 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
146 for (pixel_x = 0; pixel_x < 4; pixel_x++){
147 pixels[block_ptr] = colorA;
150 block_ptr += row_inc;
156 /* Fill blocks with 4 colors */
158 colorA = AV_RB16 (&s->buf[stream_ptr]);
161 colorB = AV_RB16 (&s->buf[stream_ptr]);
164 /* sort out the colors */
171 ta = (colorA >> 10) & 0x1F;
172 tb = (colorB >> 10) & 0x1F;
173 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
174 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
176 /* green components */
177 ta = (colorA >> 5) & 0x1F;
178 tb = (colorB >> 5) & 0x1F;
179 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
180 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
182 /* blue components */
185 color4[1] |= ((11 * ta + 21 * tb) >> 5);
186 color4[2] |= ((21 * ta + 11 * tb) >> 5);
188 if (s->size - stream_ptr < n_blocks * 4)
191 block_ptr = row_ptr + pixel_ptr;
192 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
193 index = s->buf[stream_ptr++];
194 for (pixel_x = 0; pixel_x < 4; pixel_x++){
195 idx = (index >> (2 * (3 - pixel_x))) & 0x03;
196 pixels[block_ptr] = color4[idx];
199 block_ptr += row_inc;
205 /* Fill block with 16 colors */
207 if (s->size - stream_ptr < 16)
209 block_ptr = row_ptr + pixel_ptr;
210 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
211 for (pixel_x = 0; pixel_x < 4; pixel_x++){
212 /* We already have color of upper left pixel */
213 if ((pixel_y != 0) || (pixel_x !=0)) {
214 colorA = AV_RB16 (&s->buf[stream_ptr]);
217 pixels[block_ptr] = colorA;
220 block_ptr += row_inc;
227 av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
228 " Skip remaining %d bytes of chunk data.\n", opcode,
229 chunk_size - stream_ptr);
231 } /* Opcode switch */
235 static av_cold int rpza_decode_init(AVCodecContext *avctx)
237 RpzaContext *s = avctx->priv_data;
240 avctx->pix_fmt = AV_PIX_FMT_RGB555;
242 avcodec_get_frame_defaults(&s->frame);
247 static int rpza_decode_frame(AVCodecContext *avctx,
248 void *data, int *got_frame,
251 const uint8_t *buf = avpkt->data;
252 int buf_size = avpkt->size;
253 RpzaContext *s = avctx->priv_data;
259 if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0)
262 rpza_decode_stream(s);
264 if ((ret = av_frame_ref(data, &s->frame)) < 0)
269 /* always report that the buffer was completely consumed */
273 static av_cold int rpza_decode_end(AVCodecContext *avctx)
275 RpzaContext *s = avctx->priv_data;
277 av_frame_unref(&s->frame);
282 AVCodec ff_rpza_decoder = {
284 .type = AVMEDIA_TYPE_VIDEO,
285 .id = AV_CODEC_ID_RPZA,
286 .priv_data_size = sizeof(RpzaContext),
287 .init = rpza_decode_init,
288 .close = rpza_decode_end,
289 .decode = rpza_decode_frame,
290 .capabilities = CODEC_CAP_DR1,
291 .long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),