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 {
38 static av_cold int mvc_decode_init(AVCodecContext *avctx)
40 MvcContext *s = avctx->priv_data;
41 int width = avctx->width;
42 int height = avctx->height;
45 if (avctx->codec_id == AV_CODEC_ID_MVC1) {
51 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
54 avctx->pix_fmt = (avctx->codec_id == AV_CODEC_ID_MVC1) ? AV_PIX_FMT_RGB555
56 s->frame = av_frame_alloc();
58 return AVERROR(ENOMEM);
60 s->vflip = avctx->extradata_size >= 9 &&
61 !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9);
65 static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb,
66 uint8_t *dst_start, int width, int height, int linesize)
72 for (y = 0; y < height; y += 4) {
73 for (x = 0; x < width; x += 4) {
74 if (bytestream2_get_bytes_left(gb) < 6)
77 mask = bytestream2_get_be16u(gb);
78 v[0] = bytestream2_get_be16u(gb);
79 v[1] = bytestream2_get_be16u(gb);
80 if ((v[0] & 0x8000)) {
81 if (bytestream2_get_bytes_left(gb) < 12) {
82 av_log(avctx, AV_LOG_WARNING, "buffer overflow\n");
83 return AVERROR_INVALIDDATA;
85 for (i = 2; i < 8; i++)
86 v[i] = bytestream2_get_be16u(gb);
88 v[2] = v[4] = v[6] = v[0];
89 v[3] = v[5] = v[7] = v[1];
92 #define PIX16(target, true, false) \
93 i = (mask & target) ? true : false; \
94 AV_WN16A(dst, v[i] & 0x7FFF); \
97 #define ROW16(row, a1, a0, b1, b0) \
98 dst = dst_start + (y + row) * linesize + x * 2; \
99 PIX16(1 << (row * 4), a1, a0) \
100 PIX16(1 << (row * 4 + 1), a1, a0) \
101 PIX16(1 << (row * 4 + 2), b1, b0) \
102 PIX16(1 << (row * 4 + 3), b1, b0)
104 ROW16(0, 0, 1, 2, 3);
105 ROW16(1, 0, 1, 2, 3);
106 ROW16(2, 4, 5, 6, 7);
107 ROW16(3, 4, 5, 6, 7);
113 static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel)
116 for (j = 0; j < 4; j++)
117 for (i = 0; i < 4; i++)
118 AV_WN32A(dst + j * linesize + i * 4, pixel);
121 #define PIX32(target, true, false) \
122 AV_WN32A(dst, (mask & target) ? v[true] : v[false]); \
125 #define ROW32(row, a1, a0, b1, b0) \
126 dst = dst_start + (y + row) * linesize + x * 4; \
127 PIX32(1 << (row * 4), a1, a0) \
128 PIX32(1 << (row * 4 + 1), a1, a0) \
129 PIX32(1 << (row * 4 + 2), b1, b0) \
130 PIX32(1 << (row * 4 + 3), b1, b0)
133 ROW32(0, 1, 0, 3, 2); \
134 ROW32(1, 1, 0, 3, 2); \
135 ROW32(2, 5, 4, 7, 6); \
136 ROW32(3, 5, 4, 7, 6);
138 static int decode_mvc2(AVCodecContext *avctx, GetByteContext *gb,
139 uint8_t *dst_start, int width, int height,
140 int linesize, int vflip)
143 uint32_t color[128], v[8];
144 int w, h, nb_colors, i, x, y, p0, p1, mask;
146 if (bytestream2_get_bytes_left(gb) < 6)
147 return AVERROR_INVALIDDATA;
149 w = bytestream2_get_be16u(gb);
150 h = bytestream2_get_be16u(gb);
151 if ((w & ~3) != width || (h & ~3) != height)
152 av_log(avctx, AV_LOG_WARNING, "dimension mismatch\n");
154 if (bytestream2_get_byteu(gb)) {
155 avpriv_request_sample(avctx, "bitmap feature");
156 return AVERROR_PATCHWELCOME;
159 nb_colors = bytestream2_get_byteu(gb);
160 if (bytestream2_get_bytes_left(gb) < nb_colors * 3)
161 return AVERROR_INVALIDDATA;
162 for (i = 0; i < FFMIN(nb_colors, 128); i++)
163 color[i] = 0xFF000000 | bytestream2_get_be24u(gb);
165 bytestream2_skip(gb, (nb_colors - 128) * 3);
168 dst_start += (height - 1) * linesize;
169 linesize = -linesize;
172 while (bytestream2_get_bytes_left(gb) >= 1) {
173 p0 = bytestream2_get_byteu(gb);
177 p0 = (p0 << 2) | (p0 >> 4);
178 set_4x4_block(dst_start + y * linesize + x * 4, linesize,
179 0xFF000000 | (p0 << 16) | (p0 << 8) | p0);
183 p0 = (p0 << 2) | (p0 >> 4);
184 if (bytestream2_get_bytes_left(gb) < 2)
185 return AVERROR_INVALIDDATA;
186 g = bytestream2_get_byteu(gb);
187 r = bytestream2_get_byteu(gb);
188 set_4x4_block(dst_start + y * linesize + x * 4, linesize,
189 0xFF000000 | (r << 16) | (g << 8) | p0);
192 if (bytestream2_get_bytes_left(gb) < 1)
193 return AVERROR_INVALIDDATA;
194 p1 = bytestream2_get_byteu(gb);
196 if ((p0 & 0x7F) == (p1 & 0x7F)) {
197 set_4x4_block(dst_start + y * linesize + x * 4, linesize,
200 if (bytestream2_get_bytes_left(gb) < 2)
201 return AVERROR_INVALIDDATA;
202 v[0] = v[2] = v[4] = v[6] = color[p0 & 0x7F];
203 v[1] = v[3] = v[5] = v[7] = color[p1 & 0x7F];
204 mask = bytestream2_get_le16u(gb);
208 if (bytestream2_get_bytes_left(gb) < 8)
209 return AVERROR_INVALIDDATA;
210 v[0] = color[p0 & 0x7F];
211 v[1] = color[p1 & 0x7F];
212 for (i = 2; i < 8; i++)
213 v[i] = color[bytestream2_get_byteu(gb) & 0x7F];
214 mask = bytestream2_get_le16u(gb);
230 static int mvc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
233 MvcContext *s = avctx->priv_data;
237 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
240 bytestream2_init(&gb, avpkt->data, avpkt->size);
241 if (avctx->codec_id == AV_CODEC_ID_MVC1)
242 ret = decode_mvc1(avctx, &gb, s->frame->data[0],
243 avctx->width, avctx->height, s->frame->linesize[0]);
245 ret = decode_mvc2(avctx, &gb, s->frame->data[0],
246 avctx->width, avctx->height, s->frame->linesize[0],
252 if ((ret = av_frame_ref(data, s->frame)) < 0)
258 static av_cold int mvc_decode_end(AVCodecContext *avctx)
260 MvcContext *s = avctx->priv_data;
262 av_frame_free(&s->frame);
267 #if CONFIG_MVC1_DECODER
268 AVCodec ff_mvc1_decoder = {
270 .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 1"),
271 .type = AVMEDIA_TYPE_VIDEO,
272 .id = AV_CODEC_ID_MVC1,
273 .priv_data_size = sizeof(MvcContext),
274 .init = mvc_decode_init,
275 .close = mvc_decode_end,
276 .decode = mvc_decode_frame,
277 .capabilities = CODEC_CAP_DR1,
281 #if CONFIG_MVC2_DECODER
282 AVCodec ff_mvc2_decoder = {
284 .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 2"),
285 .type = AVMEDIA_TYPE_VIDEO,
286 .id = AV_CODEC_ID_MVC2,
287 .priv_data_size = sizeof(MvcContext),
288 .init = mvc_decode_init,
289 .close = mvc_decode_end,
290 .decode = mvc_decode_frame,
291 .capabilities = CODEC_CAP_DR1,