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"
29 #include "bytestream.h"
32 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;
43 if (avctx->codec_id == AV_CODEC_ID_MVC1) {
49 if (width != avctx->width || height != avctx->height)
50 avcodec_set_dimensions(avctx, width, height);
52 avctx->pix_fmt = (avctx->codec_id == AV_CODEC_ID_MVC1) ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_BGRA;
53 s->frame = av_frame_alloc();
55 return AVERROR(ENOMEM);
57 s->vflip = avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9);
61 static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize)
68 while (bytestream2_get_bytes_left(gb) >= 6) {
69 mask = bytestream2_get_be16u(gb);
70 v[0] = bytestream2_get_be16u(gb);
71 v[1] = bytestream2_get_be16u(gb);
72 if ((v[0] & 0x8000)) {
73 if (bytestream2_get_bytes_left(gb) < 12) {
74 av_log(avctx, AV_LOG_WARNING, "buffer overflow\n");
75 return AVERROR_INVALIDDATA;
77 for (i = 2; i < 8; i++)
78 v[i] = bytestream2_get_be16u(gb);
80 v[2] = v[4] = v[6] = v[0];
81 v[3] = v[5] = v[7] = v[1];
84 #define PIX16(target, true, false) \
85 i = (mask & target) ? true : false; \
86 AV_WN16A(dst, (v[i] & 0x7C00) | (v[i] & 0x3E0) | (v[i] & 0x1F)); \
89 #define ROW16(row, a1, a0, b1, b0) \
90 dst = dst_start + (y + row) * linesize + x * 2; \
91 PIX16(1 << (row * 4), a1, a0) \
92 PIX16(1 << (row * 4 + 1), a1, a0) \
93 PIX16(1 << (row * 4 + 2), b1, b0) \
94 PIX16(1 << (row * 4 + 3), b1, b0)
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, uint8_t *dst_start, int width, int height, int linesize, int vflip)
141 uint32_t color[128], v[8];
142 int w, h, nb_colors, i, x, y, p0, p1, mask;
144 if (bytestream2_get_bytes_left(gb) < 6)
145 return AVERROR_INVALIDDATA;
147 w = bytestream2_get_be16u(gb);
148 h = bytestream2_get_be16u(gb);
149 if ((w & ~3) != width || (h & ~3) != height)
150 av_log(avctx, AV_LOG_WARNING, "dimension mismatch\n");
152 if (bytestream2_get_byteu(gb)) {
153 avpriv_request_sample(avctx, "bitmap feature");
154 return AVERROR_PATCHWELCOME;
157 nb_colors = bytestream2_get_byteu(gb);
158 if (bytestream2_get_bytes_left(gb) < nb_colors * 3)
159 return AVERROR_INVALIDDATA;
160 for (i = 0; i < FFMIN(nb_colors, 128); i++)
161 color[i] = 0xFF000000 | bytestream2_get_be24u(gb);
163 bytestream2_skip(gb, (nb_colors - 128) * 3);
166 dst_start += (height - 1) * linesize;
167 linesize = -linesize;
170 while (bytestream2_get_bytes_left(gb) >= 1) {
171 p0 = bytestream2_get_byteu(gb);
175 p0 = (p0 << 2) | (p0 >> 4);
176 set_4x4_block(dst_start + y * linesize + x * 4, linesize, 0xFF000000 | (p0 << 16) | (p0 << 8) | p0);
180 p0 = (p0 << 2) | (p0 >> 4);
181 if (bytestream2_get_bytes_left(gb) < 2)
182 return AVERROR_INVALIDDATA;
183 g = bytestream2_get_byteu(gb);
184 r = bytestream2_get_byteu(gb);
185 set_4x4_block(dst_start + y * linesize + x * 4, linesize, 0xFF000000 | (r << 16) | (g << 8) | p0);
188 if (bytestream2_get_bytes_left(gb) < 1)
189 return AVERROR_INVALIDDATA;
190 p1 = bytestream2_get_byteu(gb);
192 if ((p0 & 0x7F) == (p1 & 0x7F)) {
193 set_4x4_block(dst_start + y * linesize + x * 4, linesize, color[p0 & 0x7F]);
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,
226 void *data, int *got_frame,
229 MvcContext *s = avctx->priv_data;
233 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
236 bytestream2_init(&gb, avpkt->data, avpkt->size);
237 if (avctx->codec_id == AV_CODEC_ID_MVC1)
238 ret = decode_mvc1(avctx, &gb, s->frame->data[0], avctx->width, avctx->height, s->frame->linesize[0]);
240 ret = decode_mvc2(avctx, &gb, s->frame->data[0], avctx->width, avctx->height, s->frame->linesize[0], s->vflip);
245 if ((ret = av_frame_ref(data, s->frame)) < 0)
251 static av_cold int mvc_decode_end(AVCodecContext *avctx)
253 MvcContext *s = avctx->priv_data;
255 av_frame_free(&s->frame);
260 #if CONFIG_MVC1_DECODER
261 AVCodec ff_mvc1_decoder = {
263 .type = AVMEDIA_TYPE_VIDEO,
264 .id = AV_CODEC_ID_MVC1,
265 .priv_data_size = sizeof(MvcContext),
266 .init = mvc_decode_init,
267 .close = mvc_decode_end,
268 .decode = mvc_decode_frame,
269 .capabilities = CODEC_CAP_DR1,
270 .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 1"),
274 #if CONFIG_MVC2_DECODER
275 AVCodec ff_mvc2_decoder = {
277 .type = AVMEDIA_TYPE_VIDEO,
278 .id = AV_CODEC_ID_MVC2,
279 .priv_data_size = sizeof(MvcContext),
280 .init = mvc_decode_init,
281 .close = mvc_decode_end,
282 .decode = mvc_decode_frame,
283 .capabilities = CODEC_CAP_DR1,
284 .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 2"),