280 lines
9.5 KiB
C
Executable File
280 lines
9.5 KiB
C
Executable File
/*
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* Silicon Graphics Motion Video Compressor 1 & 2 decoder
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* Copyright (c) 2012 Peter Ross
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Silicon Graphics Motion Video Compressor 1 & 2 decoder
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*/
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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typedef struct MvcContext {
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int vflip;
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} MvcContext;
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static av_cold int mvc_decode_init(AVCodecContext *avctx)
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{
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MvcContext *s = avctx->priv_data;
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int width = avctx->width;
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int height = avctx->height;
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int ret;
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if (avctx->codec_id == AV_CODEC_ID_MVC1) {
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width += 3;
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height += 3;
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}
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width &= ~3;
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height &= ~3;
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if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
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return ret;
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avctx->pix_fmt = (avctx->codec_id == AV_CODEC_ID_MVC1) ? AV_PIX_FMT_RGB555
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: AV_PIX_FMT_RGB32;
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s->vflip = avctx->extradata_size >= 9 &&
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!memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9);
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return 0;
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}
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static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb,
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uint8_t *dst_start, int width, int height, int linesize)
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{
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uint8_t *dst;
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uint16_t v[8];
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int mask, x, y, i;
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for (y = 0; y < height; y += 4) {
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for (x = 0; x < width; x += 4) {
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if (bytestream2_get_bytes_left(gb) < 6)
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return 0;
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mask = bytestream2_get_be16u(gb);
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v[0] = bytestream2_get_be16u(gb);
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v[1] = bytestream2_get_be16u(gb);
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if ((v[0] & 0x8000)) {
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if (bytestream2_get_bytes_left(gb) < 12) {
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av_log(avctx, AV_LOG_WARNING, "buffer overflow\n");
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return AVERROR_INVALIDDATA;
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}
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for (i = 2; i < 8; i++)
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v[i] = bytestream2_get_be16u(gb);
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} else {
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v[2] = v[4] = v[6] = v[0];
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v[3] = v[5] = v[7] = v[1];
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}
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#define PIX16(target, true, false) \
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i = (mask & target) ? true : false; \
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AV_WN16A(dst, v[i] & 0x7FFF); \
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dst += 2;
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#define ROW16(row, a1, a0, b1, b0) \
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dst = dst_start + (y + row) * linesize + x * 2; \
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PIX16(1 << (row * 4), a1, a0) \
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PIX16(1 << (row * 4 + 1), a1, a0) \
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PIX16(1 << (row * 4 + 2), b1, b0) \
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PIX16(1 << (row * 4 + 3), b1, b0)
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ROW16(0, 0, 1, 2, 3);
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ROW16(1, 0, 1, 2, 3);
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ROW16(2, 4, 5, 6, 7);
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ROW16(3, 4, 5, 6, 7);
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}
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}
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return 0;
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}
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static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel)
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{
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int i, j;
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for (j = 0; j < 4; j++)
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for (i = 0; i < 4; i++)
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AV_WN32A(dst + j * linesize + i * 4, pixel);
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}
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#define PIX32(target, true, false) \
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AV_WN32A(dst, (mask & target) ? v[true] : v[false]); \
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dst += 4;
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#define ROW32(row, a1, a0, b1, b0) \
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dst = dst_start + (y + row) * linesize + x * 4; \
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PIX32(1 << (row * 4), a1, a0) \
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PIX32(1 << (row * 4 + 1), a1, a0) \
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PIX32(1 << (row * 4 + 2), b1, b0) \
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PIX32(1 << (row * 4 + 3), b1, b0)
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#define MVC2_BLOCK \
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ROW32(0, 1, 0, 3, 2); \
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ROW32(1, 1, 0, 3, 2); \
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ROW32(2, 5, 4, 7, 6); \
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ROW32(3, 5, 4, 7, 6);
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static int decode_mvc2(AVCodecContext *avctx, GetByteContext *gb,
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uint8_t *dst_start, int width, int height,
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int linesize, int vflip)
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{
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uint8_t *dst;
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uint32_t color[128], v[8];
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int w, h, nb_colors, i, x, y, p0, p1, mask;
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if (bytestream2_get_bytes_left(gb) < 6)
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return AVERROR_INVALIDDATA;
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w = bytestream2_get_be16u(gb);
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h = bytestream2_get_be16u(gb);
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if ((w & ~3) != width || (h & ~3) != height)
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av_log(avctx, AV_LOG_WARNING, "dimension mismatch\n");
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if (bytestream2_get_byteu(gb)) {
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avpriv_request_sample(avctx, "bitmap feature");
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return AVERROR_PATCHWELCOME;
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}
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nb_colors = bytestream2_get_byteu(gb);
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if (bytestream2_get_bytes_left(gb) < nb_colors * 3)
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return AVERROR_INVALIDDATA;
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for (i = 0; i < FFMIN(nb_colors, 128); i++)
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color[i] = 0xFF000000 | bytestream2_get_be24u(gb);
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if (nb_colors > 128)
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bytestream2_skip(gb, (nb_colors - 128) * 3);
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if (vflip) {
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dst_start += (height - 1) * linesize;
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linesize = -linesize;
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}
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x = y = 0;
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while (bytestream2_get_bytes_left(gb) >= 1) {
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p0 = bytestream2_get_byteu(gb);
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if ((p0 & 0x80)) {
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if ((p0 & 0x40)) {
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p0 &= 0x3F;
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p0 = (p0 << 2) | (p0 >> 4);
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set_4x4_block(dst_start + y * linesize + x * 4, linesize,
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0xFF000000 | (p0 << 16) | (p0 << 8) | p0);
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} else {
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int g, r;
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p0 &= 0x3F;
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p0 = (p0 << 2) | (p0 >> 4);
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if (bytestream2_get_bytes_left(gb) < 2)
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return AVERROR_INVALIDDATA;
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g = bytestream2_get_byteu(gb);
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r = bytestream2_get_byteu(gb);
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set_4x4_block(dst_start + y * linesize + x * 4, linesize,
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0xFF000000 | (r << 16) | (g << 8) | p0);
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}
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} else {
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if (bytestream2_get_bytes_left(gb) < 1)
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return AVERROR_INVALIDDATA;
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p1 = bytestream2_get_byteu(gb);
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if ((p1 & 0x80)) {
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if ((p0 & 0x7F) == (p1 & 0x7F)) {
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set_4x4_block(dst_start + y * linesize + x * 4, linesize,
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color[p0 & 0x7F]);
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} else {
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if (bytestream2_get_bytes_left(gb) < 2)
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return AVERROR_INVALIDDATA;
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v[0] = v[2] = v[4] = v[6] = color[p0 & 0x7F];
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v[1] = v[3] = v[5] = v[7] = color[p1 & 0x7F];
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mask = bytestream2_get_le16u(gb);
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MVC2_BLOCK
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}
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} else {
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if (bytestream2_get_bytes_left(gb) < 8)
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return AVERROR_INVALIDDATA;
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v[0] = color[p0 & 0x7F];
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v[1] = color[p1 & 0x7F];
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for (i = 2; i < 8; i++)
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v[i] = color[bytestream2_get_byteu(gb) & 0x7F];
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mask = bytestream2_get_le16u(gb);
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MVC2_BLOCK
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}
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}
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x += 4;
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if (x >= width) {
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y += 4;
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if (y >= height)
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break;
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x = 0;
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}
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}
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return 0;
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}
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static int mvc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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MvcContext *s = avctx->priv_data;
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AVFrame *frame = data;
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GetByteContext gb;
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int ret;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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bytestream2_init(&gb, avpkt->data, avpkt->size);
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if (avctx->codec_id == AV_CODEC_ID_MVC1)
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ret = decode_mvc1(avctx, &gb, frame->data[0],
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avctx->width, avctx->height, frame->linesize[0]);
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else
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ret = decode_mvc2(avctx, &gb, frame->data[0],
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avctx->width, avctx->height, frame->linesize[0],
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s->vflip);
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if (ret < 0)
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return ret;
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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*got_frame = 1;
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return avpkt->size;
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}
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#if CONFIG_MVC1_DECODER
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AVCodec ff_mvc1_decoder = {
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.name = "mvc1",
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.long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 1"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_MVC1,
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.priv_data_size = sizeof(MvcContext),
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.init = mvc_decode_init,
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.decode = mvc_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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#endif
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#if CONFIG_MVC2_DECODER
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AVCodec ff_mvc2_decoder = {
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.name = "mvc2",
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.long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 2"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_MVC2,
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.priv_data_size = sizeof(MvcContext),
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.init = mvc_decode_init,
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.decode = mvc_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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#endif
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