summaryrefslogtreecommitdiff
path: root/ffmpeg/libavcodec/mvcdec.c
diff options
context:
space:
mode:
Diffstat (limited to 'ffmpeg/libavcodec/mvcdec.c')
-rw-r--r--ffmpeg/libavcodec/mvcdec.c287
1 files changed, 0 insertions, 287 deletions
diff --git a/ffmpeg/libavcodec/mvcdec.c b/ffmpeg/libavcodec/mvcdec.c
deleted file mode 100644
index 2cc7735..0000000
--- a/ffmpeg/libavcodec/mvcdec.c
+++ /dev/null
@@ -1,287 +0,0 @@
-/*
- * Silicon Graphics Motion Video Compressor 1 & 2 decoder
- * Copyright (c) 2012 Peter Ross
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/**
- * @file
- * Silicon Graphics Motion Video Compressor 1 & 2 decoder
- */
-
-#include "libavutil/intreadwrite.h"
-#include "avcodec.h"
-#include "bytestream.h"
-#include "internal.h"
-
-typedef struct MvcContext {
- AVFrame *frame;
- int vflip;
-} MvcContext;
-
-static av_cold int mvc_decode_init(AVCodecContext *avctx)
-{
- MvcContext *s = avctx->priv_data;
- int width = avctx->width;
- int height = avctx->height;
- int ret;
-
- if (avctx->codec_id == AV_CODEC_ID_MVC1) {
- width += 3;
- height += 3;
- }
- width &= ~3;
- height &= ~3;
- if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
- return ret;
-
- avctx->pix_fmt = (avctx->codec_id == AV_CODEC_ID_MVC1) ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_BGRA;
- s->frame = av_frame_alloc();
- if (!s->frame)
- return AVERROR(ENOMEM);
-
- s->vflip = avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9);
- return 0;
-}
-
-static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize)
-{
- uint8_t *dst;
- uint16_t v[8];
- int mask, x, y, i;
-
- x = y= 0;
- while (bytestream2_get_bytes_left(gb) >= 6) {
- mask = bytestream2_get_be16u(gb);
- v[0] = bytestream2_get_be16u(gb);
- v[1] = bytestream2_get_be16u(gb);
- if ((v[0] & 0x8000)) {
- if (bytestream2_get_bytes_left(gb) < 12) {
- av_log(avctx, AV_LOG_WARNING, "buffer overflow\n");
- return AVERROR_INVALIDDATA;
- }
- for (i = 2; i < 8; i++)
- v[i] = bytestream2_get_be16u(gb);
- } else {
- v[2] = v[4] = v[6] = v[0];
- v[3] = v[5] = v[7] = v[1];
- }
-
-#define PIX16(target, true, false) \
- i = (mask & target) ? true : false; \
- AV_WN16A(dst, (v[i] & 0x7C00) | (v[i] & 0x3E0) | (v[i] & 0x1F)); \
- dst += 2;
-
-#define ROW16(row, a1, a0, b1, b0) \
- dst = dst_start + (y + row) * linesize + x * 2; \
- PIX16(1 << (row * 4), a1, a0) \
- PIX16(1 << (row * 4 + 1), a1, a0) \
- PIX16(1 << (row * 4 + 2), b1, b0) \
- PIX16(1 << (row * 4 + 3), b1, b0)
-
- ROW16(0, 0, 1, 2, 3);
- ROW16(1, 0, 1, 2, 3);
- ROW16(2, 4, 5, 6, 7);
- ROW16(3, 4, 5, 6, 7);
-
- x += 4;
- if (x >= width) {
- y += 4;
- if (y >= height) {
- break;
- }
- x = 0;
- }
- }
- return 0;
-}
-
-static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel)
-{
- int i, j;
- for (j = 0; j < 4; j++)
- for (i = 0; i < 4; i++)
- AV_WN32A(dst + j * linesize + i * 4, pixel);
-}
-
-#define PIX32(target, true, false) \
- AV_WN32A(dst, (mask & target) ? v[true] : v[false]); \
- dst += 4;
-
-#define ROW32(row, a1, a0, b1, b0) \
- dst = dst_start + (y + row) * linesize + x * 4; \
- PIX32(1 << (row * 4), a1, a0) \
- PIX32(1 << (row * 4 + 1), a1, a0) \
- PIX32(1 << (row * 4 + 2), b1, b0) \
- PIX32(1 << (row * 4 + 3), b1, b0)
-
-#define MVC2_BLOCK \
- ROW32(0, 1, 0, 3, 2); \
- ROW32(1, 1, 0, 3, 2); \
- ROW32(2, 5, 4, 7, 6); \
- ROW32(3, 5, 4, 7, 6);
-
-static int decode_mvc2(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize, int vflip)
-{
- uint8_t *dst;
- uint32_t color[128], v[8];
- int w, h, nb_colors, i, x, y, p0, p1, mask;
-
- if (bytestream2_get_bytes_left(gb) < 6)
- return AVERROR_INVALIDDATA;
-
- w = bytestream2_get_be16u(gb);
- h = bytestream2_get_be16u(gb);
- if ((w & ~3) != width || (h & ~3) != height)
- av_log(avctx, AV_LOG_WARNING, "dimension mismatch\n");
-
- if (bytestream2_get_byteu(gb)) {
- avpriv_request_sample(avctx, "bitmap feature");
- return AVERROR_PATCHWELCOME;
- }
-
- nb_colors = bytestream2_get_byteu(gb);
- if (bytestream2_get_bytes_left(gb) < nb_colors * 3)
- return AVERROR_INVALIDDATA;
- for (i = 0; i < FFMIN(nb_colors, 128); i++)
- color[i] = 0xFF000000 | bytestream2_get_be24u(gb);
- if (nb_colors > 128)
- bytestream2_skip(gb, (nb_colors - 128) * 3);
-
- if (vflip) {
- dst_start += (height - 1) * linesize;
- linesize = -linesize;
- }
- x = y = 0;
- while (bytestream2_get_bytes_left(gb) >= 1) {
- p0 = bytestream2_get_byteu(gb);
- if ((p0 & 0x80)) {
- if ((p0 & 0x40)) {
- p0 &= 0x3F;
- p0 = (p0 << 2) | (p0 >> 4);
- set_4x4_block(dst_start + y * linesize + x * 4, linesize, 0xFF000000 | (p0 << 16) | (p0 << 8) | p0);
- } else {
- int g, r;
- p0 &= 0x3F;
- p0 = (p0 << 2) | (p0 >> 4);
- if (bytestream2_get_bytes_left(gb) < 2)
- return AVERROR_INVALIDDATA;
- g = bytestream2_get_byteu(gb);
- r = bytestream2_get_byteu(gb);
- set_4x4_block(dst_start + y * linesize + x * 4, linesize, 0xFF000000 | (r << 16) | (g << 8) | p0);
- }
- } else {
- if (bytestream2_get_bytes_left(gb) < 1)
- return AVERROR_INVALIDDATA;
- p1 = bytestream2_get_byteu(gb);
- if ((p1 & 0x80)) {
- if ((p0 & 0x7F) == (p1 & 0x7F)) {
- set_4x4_block(dst_start + y * linesize + x * 4, linesize, color[p0 & 0x7F]);
- } else {
- if (bytestream2_get_bytes_left(gb) < 2)
- return AVERROR_INVALIDDATA;
- v[0] = v[2] = v[4] = v[6] = color[p0 & 0x7F];
- v[1] = v[3] = v[5] = v[7] = color[p1 & 0x7F];
- mask = bytestream2_get_le16u(gb);
- MVC2_BLOCK
- }
- } else {
- if (bytestream2_get_bytes_left(gb) < 8)
- return AVERROR_INVALIDDATA;
- v[0] = color[p0 & 0x7F];
- v[1] = color[p1 & 0x7F];
- for (i = 2; i < 8; i++)
- v[i] = color[bytestream2_get_byteu(gb) & 0x7F];
- mask = bytestream2_get_le16u(gb);
- MVC2_BLOCK
- }
- }
-
- x += 4;
- if (x >= width) {
- y += 4;
- if (y >= height)
- break;
- x = 0;
- }
- }
- return 0;
-}
-
-static int mvc_decode_frame(AVCodecContext *avctx,
- void *data, int *got_frame,
- AVPacket *avpkt)
-{
- MvcContext *s = avctx->priv_data;
- GetByteContext gb;
- int ret;
-
- if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
- return ret;
-
- bytestream2_init(&gb, avpkt->data, avpkt->size);
- if (avctx->codec_id == AV_CODEC_ID_MVC1)
- ret = decode_mvc1(avctx, &gb, s->frame->data[0], avctx->width, avctx->height, s->frame->linesize[0]);
- else
- ret = decode_mvc2(avctx, &gb, s->frame->data[0], avctx->width, avctx->height, s->frame->linesize[0], s->vflip);
- if (ret < 0)
- return ret;
-
- *got_frame = 1;
- if ((ret = av_frame_ref(data, s->frame)) < 0)
- return ret;
-
- return avpkt->size;
-}
-
-static av_cold int mvc_decode_end(AVCodecContext *avctx)
-{
- MvcContext *s = avctx->priv_data;
-
- av_frame_free(&s->frame);
-
- return 0;
-}
-
-#if CONFIG_MVC1_DECODER
-AVCodec ff_mvc1_decoder = {
- .name = "mvc1",
- .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 1"),
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_MVC1,
- .priv_data_size = sizeof(MvcContext),
- .init = mvc_decode_init,
- .close = mvc_decode_end,
- .decode = mvc_decode_frame,
- .capabilities = CODEC_CAP_DR1,
-};
-#endif
-
-#if CONFIG_MVC2_DECODER
-AVCodec ff_mvc2_decoder = {
- .name = "mvc2",
- .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 2"),
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_MVC2,
- .priv_data_size = sizeof(MvcContext),
- .init = mvc_decode_init,
- .close = mvc_decode_end,
- .decode = mvc_decode_frame,
- .capabilities = CODEC_CAP_DR1,
-};
-#endif
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 08:56:12 +0000