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 <rtogni@bresciaonline.it>
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 ffmpeg documentation states that RGB555 pixels
34 * shall be stored in native CPU endianness.
45 typedef struct RpzaContext {
47 AVCodecContext *avctx;
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);
189 block_ptr = row_ptr + pixel_ptr;
190 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
191 index = s->buf[stream_ptr++];
192 for (pixel_x = 0; pixel_x < 4; pixel_x++){
193 idx = (index >> (2 * (3 - pixel_x))) & 0x03;
194 pixels[block_ptr] = color4[idx];
197 block_ptr += row_inc;
203 /* Fill block with 16 colors */
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 = AV_RB16 (&s->buf[stream_ptr]);
213 pixels[block_ptr] = colorA;
216 block_ptr += row_inc;
223 av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
224 " Skip remaining %d bytes of chunk data.\n", opcode,
225 chunk_size - stream_ptr);
227 } /* Opcode switch */
231 static int rpza_decode_init(AVCodecContext *avctx)
233 RpzaContext *s = avctx->priv_data;
236 avctx->pix_fmt = PIX_FMT_RGB555;
237 dsputil_init(&s->dsp, avctx);
239 s->frame.data[0] = NULL;
244 static int rpza_decode_frame(AVCodecContext *avctx,
245 void *data, int *data_size,
246 uint8_t *buf, int buf_size)
248 RpzaContext *s = avctx->priv_data;
253 s->frame.reference = 1;
254 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
255 if (avctx->reget_buffer(avctx, &s->frame)) {
256 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
260 rpza_decode_stream(s);
262 *data_size = sizeof(AVFrame);
263 *(AVFrame*)data = s->frame;
265 /* always report that the buffer was completely consumed */
269 static int rpza_decode_end(AVCodecContext *avctx)
271 RpzaContext *s = avctx->priv_data;
273 if (s->frame.data[0])
274 avctx->release_buffer(avctx, &s->frame);
279 AVCodec rpza_decoder = {