2 * Silicon Graphics Motion Video Compressor 1 & 2 decoder
3 * Copyright (c) 2012 Peter Ross
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 * Silicon Graphics Motion Video Compressor 1 & 2 decoder
27 #include "libavutil/intreadwrite.h"
30 #include "bytestream.h"
33 typedef struct MvcContext {
37 static av_cold int mvc_decode_init(AVCodecContext *avctx)
39 MvcContext *s = avctx->priv_data;
40 int width = avctx->width;
41 int height = avctx->height;
44 if (avctx->codec_id == AV_CODEC_ID_MVC1) {
50 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
53 avctx->pix_fmt = (avctx->codec_id == AV_CODEC_ID_MVC1) ? AV_PIX_FMT_RGB555
55 s->vflip = avctx->extradata_size >= 9 &&
56 !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9);
60 static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb,
61 uint8_t *dst_start, int width, int height, int linesize)
67 for (y = 0; y < height; y += 4) {
68 for (x = 0; x < width; x += 4) {
69 if (bytestream2_get_bytes_left(gb) < 6)
72 mask = bytestream2_get_be16u(gb);
73 v[0] = bytestream2_get_be16u(gb);
74 v[1] = bytestream2_get_be16u(gb);
75 if ((v[0] & 0x8000)) {
76 if (bytestream2_get_bytes_left(gb) < 12) {
77 av_log(avctx, AV_LOG_WARNING, "buffer overflow\n");
78 return AVERROR_INVALIDDATA;
80 for (i = 2; i < 8; i++)
81 v[i] = bytestream2_get_be16u(gb);
83 v[2] = v[4] = v[6] = v[0];
84 v[3] = v[5] = v[7] = v[1];
87 #define PIX16(target, true, false) \
88 i = (mask & target) ? true : false; \
89 AV_WN16A(dst, v[i] & 0x7FFF); \
92 #define ROW16(row, a1, a0, b1, b0) \
93 dst = dst_start + (y + row) * linesize + x * 2; \
94 PIX16(1 << (row * 4), a1, a0) \
95 PIX16(1 << (row * 4 + 1), a1, a0) \
96 PIX16(1 << (row * 4 + 2), b1, b0) \
97 PIX16(1 << (row * 4 + 3), b1, b0)
100 ROW16(1, 0, 1, 2, 3);
101 ROW16(2, 4, 5, 6, 7);
102 ROW16(3, 4, 5, 6, 7);
108 static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel)
111 for (j = 0; j < 4; j++)
112 for (i = 0; i < 4; i++)
113 AV_WN32A(dst + j * linesize + i * 4, pixel);
116 #define PIX32(target, true, false) \
117 AV_WN32A(dst, (mask & target) ? v[true] : v[false]); \
120 #define ROW32(row, a1, a0, b1, b0) \
121 dst = dst_start + (y + row) * linesize + x * 4; \
122 PIX32(1 << (row * 4), a1, a0) \
123 PIX32(1 << (row * 4 + 1), a1, a0) \
124 PIX32(1 << (row * 4 + 2), b1, b0) \
125 PIX32(1 << (row * 4 + 3), b1, b0)
128 ROW32(0, 1, 0, 3, 2); \
129 ROW32(1, 1, 0, 3, 2); \
130 ROW32(2, 5, 4, 7, 6); \
131 ROW32(3, 5, 4, 7, 6);
133 static int decode_mvc2(AVCodecContext *avctx, GetByteContext *gb,
134 uint8_t *dst_start, int width, int height,
135 int linesize, int vflip)
138 uint32_t color[128], v[8];
139 int w, h, nb_colors, i, x, y, p0, p1, mask;
141 if (bytestream2_get_bytes_left(gb) < 6)
142 return AVERROR_INVALIDDATA;
144 w = bytestream2_get_be16u(gb);
145 h = bytestream2_get_be16u(gb);
146 if ((w & ~3) != width || (h & ~3) != height)
147 av_log(avctx, AV_LOG_WARNING, "dimension mismatch\n");
149 if (bytestream2_get_byteu(gb)) {
150 avpriv_request_sample(avctx, "bitmap feature");
151 return AVERROR_PATCHWELCOME;
154 nb_colors = bytestream2_get_byteu(gb);
155 if (bytestream2_get_bytes_left(gb) < nb_colors * 3)
156 return AVERROR_INVALIDDATA;
157 for (i = 0; i < FFMIN(nb_colors, 128); i++)
158 color[i] = 0xFF000000 | bytestream2_get_be24u(gb);
160 bytestream2_skip(gb, (nb_colors - 128) * 3);
163 dst_start += (height - 1) * linesize;
164 linesize = -linesize;
167 while (bytestream2_get_bytes_left(gb) >= 1) {
168 p0 = bytestream2_get_byteu(gb);
172 p0 = (p0 << 2) | (p0 >> 4);
173 set_4x4_block(dst_start + y * linesize + x * 4, linesize,
174 0xFF000000 | (p0 << 16) | (p0 << 8) | p0);
178 p0 = (p0 << 2) | (p0 >> 4);
179 if (bytestream2_get_bytes_left(gb) < 2)
180 return AVERROR_INVALIDDATA;
181 g = bytestream2_get_byteu(gb);
182 r = bytestream2_get_byteu(gb);
183 set_4x4_block(dst_start + y * linesize + x * 4, linesize,
184 0xFF000000 | (r << 16) | (g << 8) | p0);
187 if (bytestream2_get_bytes_left(gb) < 1)
188 return AVERROR_INVALIDDATA;
189 p1 = bytestream2_get_byteu(gb);
191 if ((p0 & 0x7F) == (p1 & 0x7F)) {
192 set_4x4_block(dst_start + y * linesize + x * 4, linesize,
195 if (bytestream2_get_bytes_left(gb) < 2)
196 return AVERROR_INVALIDDATA;
197 v[0] = v[2] = v[4] = v[6] = color[p0 & 0x7F];
198 v[1] = v[3] = v[5] = v[7] = color[p1 & 0x7F];
199 mask = bytestream2_get_le16u(gb);
203 if (bytestream2_get_bytes_left(gb) < 8)
204 return AVERROR_INVALIDDATA;
205 v[0] = color[p0 & 0x7F];
206 v[1] = color[p1 & 0x7F];
207 for (i = 2; i < 8; i++)
208 v[i] = color[bytestream2_get_byteu(gb) & 0x7F];
209 mask = bytestream2_get_le16u(gb);
225 static int mvc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
228 MvcContext *s = avctx->priv_data;
229 AVFrame *frame = data;
233 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
236 bytestream2_init(&gb, avpkt->data, avpkt->size);
237 if (avctx->codec_id == AV_CODEC_ID_MVC1)
238 ret = decode_mvc1(avctx, &gb, frame->data[0],
239 avctx->width, avctx->height, frame->linesize[0]);
241 ret = decode_mvc2(avctx, &gb, frame->data[0],
242 avctx->width, avctx->height, frame->linesize[0],
247 frame->pict_type = AV_PICTURE_TYPE_I;
248 frame->key_frame = 1;
255 #if CONFIG_MVC1_DECODER
256 AVCodec ff_mvc1_decoder = {
258 .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 1"),
259 .type = AVMEDIA_TYPE_VIDEO,
260 .id = AV_CODEC_ID_MVC1,
261 .priv_data_size = sizeof(MvcContext),
262 .init = mvc_decode_init,
263 .decode = mvc_decode_frame,
264 .capabilities = AV_CODEC_CAP_DR1,
268 #if CONFIG_MVC2_DECODER
269 AVCodec ff_mvc2_decoder = {
271 .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 2"),
272 .type = AVMEDIA_TYPE_VIDEO,
273 .id = AV_CODEC_ID_MVC2,
274 .priv_data_size = sizeof(MvcContext),
275 .init = mvc_decode_init,
276 .decode = mvc_decode_frame,
277 .capabilities = AV_CODEC_CAP_DR1,