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;
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 : AV_PIX_FMT_BGRA;
54 s->frame = av_frame_alloc();
56 return AVERROR(ENOMEM);
58 s->vflip = avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9);
62 static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize)
69 while (bytestream2_get_bytes_left(gb) >= 6) {
70 mask = bytestream2_get_be16u(gb);
71 v[0] = bytestream2_get_be16u(gb);
72 v[1] = bytestream2_get_be16u(gb);
73 if ((v[0] & 0x8000)) {
74 if (bytestream2_get_bytes_left(gb) < 12) {
75 av_log(avctx, AV_LOG_WARNING, "buffer overflow\n");
76 return AVERROR_INVALIDDATA;
78 for (i = 2; i < 8; i++)
79 v[i] = bytestream2_get_be16u(gb);
81 v[2] = v[4] = v[6] = v[0];
82 v[3] = v[5] = v[7] = v[1];
85 #define PIX16(target, true, false) \
86 i = (mask & target) ? true : false; \
87 AV_WN16A(dst, (v[i] & 0x7C00) | (v[i] & 0x3E0) | (v[i] & 0x1F)); \
90 #define ROW16(row, a1, a0, b1, b0) \
91 dst = dst_start + (y + row) * linesize + x * 2; \
92 PIX16(1 << (row * 4), a1, a0) \
93 PIX16(1 << (row * 4 + 1), a1, a0) \
94 PIX16(1 << (row * 4 + 2), b1, b0) \
95 PIX16(1 << (row * 4 + 3), b1, b0)
100 ROW16(3, 4, 5, 6, 7);
114 static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel)
117 for (j = 0; j < 4; j++)
118 for (i = 0; i < 4; i++)
119 AV_WN32A(dst + j * linesize + i * 4, pixel);
122 #define PIX32(target, true, false) \
123 AV_WN32A(dst, (mask & target) ? v[true] : v[false]); \
126 #define ROW32(row, a1, a0, b1, b0) \
127 dst = dst_start + (y + row) * linesize + x * 4; \
128 PIX32(1 << (row * 4), a1, a0) \
129 PIX32(1 << (row * 4 + 1), a1, a0) \
130 PIX32(1 << (row * 4 + 2), b1, b0) \
131 PIX32(1 << (row * 4 + 3), b1, b0)
134 ROW32(0, 1, 0, 3, 2); \
135 ROW32(1, 1, 0, 3, 2); \
136 ROW32(2, 5, 4, 7, 6); \
137 ROW32(3, 5, 4, 7, 6);
139 static int decode_mvc2(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize, int vflip)
142 uint32_t color[128], v[8];
143 int w, h, nb_colors, i, x, y, p0, p1, mask;
145 if (bytestream2_get_bytes_left(gb) < 6)
146 return AVERROR_INVALIDDATA;
148 w = bytestream2_get_be16u(gb);
149 h = bytestream2_get_be16u(gb);
150 if ((w & ~3) != width || (h & ~3) != height)
151 av_log(avctx, AV_LOG_WARNING, "dimension mismatch\n");
153 if (bytestream2_get_byteu(gb)) {
154 avpriv_request_sample(avctx, "bitmap feature");
155 return AVERROR_PATCHWELCOME;
158 nb_colors = bytestream2_get_byteu(gb);
159 if (bytestream2_get_bytes_left(gb) < nb_colors * 3)
160 return AVERROR_INVALIDDATA;
161 for (i = 0; i < FFMIN(nb_colors, 128); i++)
162 color[i] = 0xFF000000 | bytestream2_get_be24u(gb);
164 bytestream2_skip(gb, (nb_colors - 128) * 3);
167 dst_start += (height - 1) * linesize;
168 linesize = -linesize;
171 while (bytestream2_get_bytes_left(gb) >= 1) {
172 p0 = bytestream2_get_byteu(gb);
176 p0 = (p0 << 2) | (p0 >> 4);
177 set_4x4_block(dst_start + y * linesize + x * 4, linesize, 0xFF000000 | (p0 << 16) | (p0 << 8) | p0);
181 p0 = (p0 << 2) | (p0 >> 4);
182 if (bytestream2_get_bytes_left(gb) < 2)
183 return AVERROR_INVALIDDATA;
184 g = bytestream2_get_byteu(gb);
185 r = bytestream2_get_byteu(gb);
186 set_4x4_block(dst_start + y * linesize + x * 4, linesize, 0xFF000000 | (r << 16) | (g << 8) | p0);
189 if (bytestream2_get_bytes_left(gb) < 1)
190 return AVERROR_INVALIDDATA;
191 p1 = bytestream2_get_byteu(gb);
193 if ((p0 & 0x7F) == (p1 & 0x7F)) {
194 set_4x4_block(dst_start + y * linesize + x * 4, linesize, color[p0 & 0x7F]);
196 if (bytestream2_get_bytes_left(gb) < 2)
197 return AVERROR_INVALIDDATA;
198 v[0] = v[2] = v[4] = v[6] = color[p0 & 0x7F];
199 v[1] = v[3] = v[5] = v[7] = color[p1 & 0x7F];
200 mask = bytestream2_get_le16u(gb);
204 if (bytestream2_get_bytes_left(gb) < 8)
205 return AVERROR_INVALIDDATA;
206 v[0] = color[p0 & 0x7F];
207 v[1] = color[p1 & 0x7F];
208 for (i = 2; i < 8; i++)
209 v[i] = color[bytestream2_get_byteu(gb) & 0x7F];
210 mask = bytestream2_get_le16u(gb);
226 static int mvc_decode_frame(AVCodecContext *avctx,
227 void *data, int *got_frame,
230 MvcContext *s = avctx->priv_data;
234 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
237 bytestream2_init(&gb, avpkt->data, avpkt->size);
238 if (avctx->codec_id == AV_CODEC_ID_MVC1)
239 ret = decode_mvc1(avctx, &gb, s->frame->data[0], avctx->width, avctx->height, s->frame->linesize[0]);
241 ret = decode_mvc2(avctx, &gb, s->frame->data[0], avctx->width, avctx->height, s->frame->linesize[0], s->vflip);
246 if ((ret = av_frame_ref(data, s->frame)) < 0)
252 static av_cold int mvc_decode_end(AVCodecContext *avctx)
254 MvcContext *s = avctx->priv_data;
256 av_frame_free(&s->frame);
261 #if CONFIG_MVC1_DECODER
262 AVCodec ff_mvc1_decoder = {
264 .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 1"),
265 .type = AVMEDIA_TYPE_VIDEO,
266 .id = AV_CODEC_ID_MVC1,
267 .priv_data_size = sizeof(MvcContext),
268 .init = mvc_decode_init,
269 .close = mvc_decode_end,
270 .decode = mvc_decode_frame,
271 .capabilities = CODEC_CAP_DR1,
275 #if CONFIG_MVC2_DECODER
276 AVCodec ff_mvc2_decoder = {
278 .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 2"),
279 .type = AVMEDIA_TYPE_VIDEO,
280 .id = AV_CODEC_ID_MVC2,
281 .priv_data_size = sizeof(MvcContext),
282 .init = mvc_decode_init,
283 .close = mvc_decode_end,
284 .decode = mvc_decode_frame,
285 .capabilities = CODEC_CAP_DR1,