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.
47 typedef struct RpzaContext {
49 AVCodecContext *avctx;
58 #define ADVANCE_BLOCK() \
61 if (pixel_ptr >= width) \
64 row_ptr += stride * 4; \
67 if (total_blocks < 0) \
69 av_log(s->avctx, AV_LOG_ERROR, "warning: block counter just went negative (this should not happen)\n"); \
74 static void rpza_decode_stream(RpzaContext *s)
76 int width = s->avctx->width;
77 int stride = s->frame.linesize[0] / 2;
78 int row_inc = stride - 4;
83 unsigned short colorA = 0, colorB;
84 unsigned short color4[4];
85 unsigned char index, idx;
86 unsigned short ta, tb;
87 unsigned short *pixels = (unsigned short *)s->frame.data[0];
95 /* First byte is always 0xe1. Warn if it's different */
96 if (s->buf[stream_ptr] != 0xe1)
97 av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
100 /* Get chunk size, ingnoring first byte */
101 chunk_size = AV_RB32(&s->buf[stream_ptr]) & 0x00FFFFFF;
104 /* If length mismatch use size from MOV file and try to decode anyway */
105 if (chunk_size != s->size)
106 av_log(s->avctx, AV_LOG_ERROR, "MOV chunk size != encoded chunk size; using MOV chunk size\n");
108 chunk_size = s->size;
110 /* Number of 4x4 blocks in frame. */
111 total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
113 /* Process chunk data */
114 while (stream_ptr < chunk_size) {
115 opcode = s->buf[stream_ptr++]; /* Get opcode */
117 n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
119 /* If opcode MSbit is 0, we need more data to decide what to do */
120 if ((opcode & 0x80) == 0) {
121 colorA = (opcode << 8) | (s->buf[stream_ptr++]);
123 if ((s->buf[stream_ptr] & 0x80) != 0) {
124 /* Must behave as opcode 110xxxxx, using colorA computed
125 * above. Use fake opcode 0x20 to enter switch block at
132 switch (opcode & 0xe0) {
141 /* Fill blocks with one color */
143 colorA = AV_RB16 (&s->buf[stream_ptr]);
146 block_ptr = row_ptr + pixel_ptr;
147 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
148 for (pixel_x = 0; pixel_x < 4; pixel_x++){
149 pixels[block_ptr] = colorA;
152 block_ptr += row_inc;
158 /* Fill blocks with 4 colors */
160 colorA = AV_RB16 (&s->buf[stream_ptr]);
163 colorB = AV_RB16 (&s->buf[stream_ptr]);
166 /* sort out the colors */
173 ta = (colorA >> 10) & 0x1F;
174 tb = (colorB >> 10) & 0x1F;
175 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
176 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
178 /* green components */
179 ta = (colorA >> 5) & 0x1F;
180 tb = (colorB >> 5) & 0x1F;
181 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
182 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
184 /* blue components */
187 color4[1] |= ((11 * ta + 21 * tb) >> 5);
188 color4[2] |= ((21 * ta + 11 * tb) >> 5);
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 block_ptr = row_ptr + pixel_ptr;
208 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
209 for (pixel_x = 0; pixel_x < 4; pixel_x++){
210 /* We already have color of upper left pixel */
211 if ((pixel_y != 0) || (pixel_x !=0)) {
212 colorA = AV_RB16 (&s->buf[stream_ptr]);
215 pixels[block_ptr] = colorA;
218 block_ptr += row_inc;
225 av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
226 " Skip remaining %d bytes of chunk data.\n", opcode,
227 chunk_size - stream_ptr);
229 } /* Opcode switch */
233 static int rpza_decode_init(AVCodecContext *avctx)
235 RpzaContext *s = (RpzaContext *)avctx->priv_data;
238 avctx->pix_fmt = PIX_FMT_RGB555;
239 avctx->has_b_frames = 0;
240 dsputil_init(&s->dsp, avctx);
242 s->frame.data[0] = NULL;
247 static int rpza_decode_frame(AVCodecContext *avctx,
248 void *data, int *data_size,
249 uint8_t *buf, int buf_size)
251 RpzaContext *s = (RpzaContext *)avctx->priv_data;
256 s->frame.reference = 1;
257 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
258 if (avctx->reget_buffer(avctx, &s->frame)) {
259 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
263 rpza_decode_stream(s);
265 *data_size = sizeof(AVFrame);
266 *(AVFrame*)data = s->frame;
268 /* always report that the buffer was completely consumed */
272 static int rpza_decode_end(AVCodecContext *avctx)
274 RpzaContext *s = (RpzaContext *)avctx->priv_data;
276 if (s->frame.data[0])
277 avctx->release_buffer(avctx, &s->frame);
282 AVCodec rpza_decoder = {