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
25 * QT RPZA Video Decoder by Roberto Togni <rtogni@bresciaonline.it>
26 * For more information about the RPZA format, visit:
27 * http://www.pcisys.net/~melanson/codecs/
29 * The RPZA decoder outputs RGB555 colorspace data.
31 * Note that this decoder reads big endian RGB555 pixel values from the
32 * bytestream, arranges them in the host's endian order, and outputs
33 * them to the final rendered map in the same host endian order. This is
34 * intended behavior as the ffmpeg documentation states that RGB555 pixels
35 * shall be stored in native CPU endianness.
46 typedef struct RpzaContext {
48 AVCodecContext *avctx;
57 #define ADVANCE_BLOCK() \
60 if (pixel_ptr >= width) \
63 row_ptr += stride * 4; \
66 if (total_blocks < 0) \
68 av_log(s->avctx, AV_LOG_ERROR, "warning: block counter just went negative (this should not happen)\n"); \
73 static void rpza_decode_stream(RpzaContext *s)
75 int width = s->avctx->width;
76 int stride = s->frame.linesize[0] / 2;
77 int row_inc = stride - 4;
82 unsigned short colorA = 0, colorB;
83 unsigned short color4[4];
84 unsigned char index, idx;
85 unsigned short ta, tb;
86 unsigned short *pixels = (unsigned short *)s->frame.data[0];
94 /* First byte is always 0xe1. Warn if it's different */
95 if (s->buf[stream_ptr] != 0xe1)
96 av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
99 /* Get chunk size, ingnoring first byte */
100 chunk_size = AV_RB32(&s->buf[stream_ptr]) & 0x00FFFFFF;
103 /* If length mismatch use size from MOV file and try to decode anyway */
104 if (chunk_size != s->size)
105 av_log(s->avctx, AV_LOG_ERROR, "MOV chunk size != encoded chunk size; using MOV chunk size\n");
107 chunk_size = s->size;
109 /* Number of 4x4 blocks in frame. */
110 total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
112 /* Process chunk data */
113 while (stream_ptr < chunk_size) {
114 opcode = s->buf[stream_ptr++]; /* Get opcode */
116 n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
118 /* If opcode MSbit is 0, we need more data to decide what to do */
119 if ((opcode & 0x80) == 0) {
120 colorA = (opcode << 8) | (s->buf[stream_ptr++]);
122 if ((s->buf[stream_ptr] & 0x80) != 0) {
123 /* Must behave as opcode 110xxxxx, using colorA computed
124 * above. Use fake opcode 0x20 to enter switch block at
131 switch (opcode & 0xe0) {
140 /* Fill blocks with one color */
142 colorA = AV_RB16 (&s->buf[stream_ptr]);
145 block_ptr = row_ptr + pixel_ptr;
146 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
147 for (pixel_x = 0; pixel_x < 4; pixel_x++){
148 pixels[block_ptr] = colorA;
151 block_ptr += row_inc;
157 /* Fill blocks with 4 colors */
159 colorA = AV_RB16 (&s->buf[stream_ptr]);
162 colorB = AV_RB16 (&s->buf[stream_ptr]);
165 /* sort out the colors */
172 ta = (colorA >> 10) & 0x1F;
173 tb = (colorB >> 10) & 0x1F;
174 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
175 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
177 /* green components */
178 ta = (colorA >> 5) & 0x1F;
179 tb = (colorB >> 5) & 0x1F;
180 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
181 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
183 /* blue components */
186 color4[1] |= ((11 * ta + 21 * tb) >> 5);
187 color4[2] |= ((21 * ta + 11 * tb) >> 5);
190 block_ptr = row_ptr + pixel_ptr;
191 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
192 index = s->buf[stream_ptr++];
193 for (pixel_x = 0; pixel_x < 4; pixel_x++){
194 idx = (index >> (2 * (3 - pixel_x))) & 0x03;
195 pixels[block_ptr] = color4[idx];
198 block_ptr += row_inc;
204 /* Fill block with 16 colors */
206 block_ptr = row_ptr + pixel_ptr;
207 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
208 for (pixel_x = 0; pixel_x < 4; pixel_x++){
209 /* We already have color of upper left pixel */
210 if ((pixel_y != 0) || (pixel_x !=0)) {
211 colorA = AV_RB16 (&s->buf[stream_ptr]);
214 pixels[block_ptr] = colorA;
217 block_ptr += row_inc;
224 av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
225 " Skip remaining %d bytes of chunk data.\n", opcode,
226 chunk_size - stream_ptr);
228 } /* Opcode switch */
232 static int rpza_decode_init(AVCodecContext *avctx)
234 RpzaContext *s = avctx->priv_data;
237 avctx->pix_fmt = PIX_FMT_RGB555;
238 dsputil_init(&s->dsp, avctx);
240 s->frame.data[0] = NULL;
245 static int rpza_decode_frame(AVCodecContext *avctx,
246 void *data, int *data_size,
247 uint8_t *buf, int buf_size)
249 RpzaContext *s = avctx->priv_data;
254 s->frame.reference = 1;
255 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
256 if (avctx->reget_buffer(avctx, &s->frame)) {
257 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
261 rpza_decode_stream(s);
263 *data_size = sizeof(AVFrame);
264 *(AVFrame*)data = s->frame;
266 /* always report that the buffer was completely consumed */
270 static int rpza_decode_end(AVCodecContext *avctx)
272 RpzaContext *s = avctx->priv_data;
274 if (s->frame.data[0])
275 avctx->release_buffer(avctx, &s->frame);
280 AVCodec rpza_decoder = {