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Diffstat (limited to 'ffmpeg/libavcodec/kmvc.c')
-rw-r--r--ffmpeg/libavcodec/kmvc.c442
1 files changed, 442 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/kmvc.c b/ffmpeg/libavcodec/kmvc.c
new file mode 100644
index 0000000..20aae67
--- /dev/null
+++ b/ffmpeg/libavcodec/kmvc.c
@@ -0,0 +1,442 @@
+/*
+ * KMVC decoder
+ * Copyright (c) 2006 Konstantin Shishkov
+ *
+ * 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
+ * Karl Morton's Video Codec decoder
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+
+#define KMVC_KEYFRAME 0x80
+#define KMVC_PALETTE 0x40
+#define KMVC_METHOD 0x0F
+#define MAX_PALSIZE 256
+
+/*
+ * Decoder context
+ */
+typedef struct KmvcContext {
+ AVCodecContext *avctx;
+
+ int setpal;
+ int palsize;
+ uint32_t pal[MAX_PALSIZE];
+ uint8_t *cur, *prev;
+ uint8_t *frm0, *frm1;
+ GetByteContext g;
+} KmvcContext;
+
+typedef struct BitBuf {
+ int bits;
+ int bitbuf;
+} BitBuf;
+
+#define BLK(data, x, y) data[(x) + (y) * 320]
+
+#define kmvc_init_getbits(bb, g) bb.bits = 7; bb.bitbuf = bytestream2_get_byte(g);
+
+#define kmvc_getbit(bb, g, res) {\
+ res = 0; \
+ if (bb.bitbuf & (1 << bb.bits)) res = 1; \
+ bb.bits--; \
+ if(bb.bits == -1) { \
+ bb.bitbuf = bytestream2_get_byte(g); \
+ bb.bits = 7; \
+ } \
+}
+
+static int kmvc_decode_intra_8x8(KmvcContext * ctx, int w, int h)
+{
+ BitBuf bb;
+ int res, val;
+ int i, j;
+ int bx, by;
+ int l0x, l1x, l0y, l1y;
+ int mx, my;
+
+ kmvc_init_getbits(bb, &ctx->g);
+
+ for (by = 0; by < h; by += 8)
+ for (bx = 0; bx < w; bx += 8) {
+ if (!bytestream2_get_bytes_left(&ctx->g)) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "Data overrun\n");
+ return AVERROR_INVALIDDATA;
+ }
+ kmvc_getbit(bb, &ctx->g, res);
+ if (!res) { // fill whole 8x8 block
+ val = bytestream2_get_byte(&ctx->g);
+ for (i = 0; i < 64; i++)
+ BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) = val;
+ } else { // handle four 4x4 subblocks
+ for (i = 0; i < 4; i++) {
+ l0x = bx + (i & 1) * 4;
+ l0y = by + (i & 2) * 2;
+ kmvc_getbit(bb, &ctx->g, res);
+ if (!res) {
+ kmvc_getbit(bb, &ctx->g, res);
+ if (!res) { // fill whole 4x4 block
+ val = bytestream2_get_byte(&ctx->g);
+ for (j = 0; j < 16; j++)
+ BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) = val;
+ } else { // copy block from already decoded place
+ val = bytestream2_get_byte(&ctx->g);
+ mx = val & 0xF;
+ my = val >> 4;
+ if ((l0x-mx) + 320*(l0y-my) < 0 || (l0x-mx) + 320*(l0y-my) > 316*196) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
+ return AVERROR_INVALIDDATA;
+ }
+ for (j = 0; j < 16; j++)
+ BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) =
+ BLK(ctx->cur, l0x + (j & 3) - mx, l0y + (j >> 2) - my);
+ }
+ } else { // descend to 2x2 sub-sub-blocks
+ for (j = 0; j < 4; j++) {
+ l1x = l0x + (j & 1) * 2;
+ l1y = l0y + (j & 2);
+ kmvc_getbit(bb, &ctx->g, res);
+ if (!res) {
+ kmvc_getbit(bb, &ctx->g, res);
+ if (!res) { // fill whole 2x2 block
+ val = bytestream2_get_byte(&ctx->g);
+ BLK(ctx->cur, l1x, l1y) = val;
+ BLK(ctx->cur, l1x + 1, l1y) = val;
+ BLK(ctx->cur, l1x, l1y + 1) = val;
+ BLK(ctx->cur, l1x + 1, l1y + 1) = val;
+ } else { // copy block from already decoded place
+ val = bytestream2_get_byte(&ctx->g);
+ mx = val & 0xF;
+ my = val >> 4;
+ if ((l1x-mx) + 320*(l1y-my) < 0 || (l1x-mx) + 320*(l1y-my) > 318*198) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
+ return AVERROR_INVALIDDATA;
+ }
+ BLK(ctx->cur, l1x, l1y) = BLK(ctx->cur, l1x - mx, l1y - my);
+ BLK(ctx->cur, l1x + 1, l1y) =
+ BLK(ctx->cur, l1x + 1 - mx, l1y - my);
+ BLK(ctx->cur, l1x, l1y + 1) =
+ BLK(ctx->cur, l1x - mx, l1y + 1 - my);
+ BLK(ctx->cur, l1x + 1, l1y + 1) =
+ BLK(ctx->cur, l1x + 1 - mx, l1y + 1 - my);
+ }
+ } else { // read values for block
+ BLK(ctx->cur, l1x, l1y) = bytestream2_get_byte(&ctx->g);
+ BLK(ctx->cur, l1x + 1, l1y) = bytestream2_get_byte(&ctx->g);
+ BLK(ctx->cur, l1x, l1y + 1) = bytestream2_get_byte(&ctx->g);
+ BLK(ctx->cur, l1x + 1, l1y + 1) = bytestream2_get_byte(&ctx->g);
+ }
+ }
+ }
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int kmvc_decode_inter_8x8(KmvcContext * ctx, int w, int h)
+{
+ BitBuf bb;
+ int res, val;
+ int i, j;
+ int bx, by;
+ int l0x, l1x, l0y, l1y;
+ int mx, my;
+
+ kmvc_init_getbits(bb, &ctx->g);
+
+ for (by = 0; by < h; by += 8)
+ for (bx = 0; bx < w; bx += 8) {
+ kmvc_getbit(bb, &ctx->g, res);
+ if (!res) {
+ kmvc_getbit(bb, &ctx->g, res);
+ if (!res) { // fill whole 8x8 block
+ if (!bytestream2_get_bytes_left(&ctx->g)) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "Data overrun\n");
+ return AVERROR_INVALIDDATA;
+ }
+ val = bytestream2_get_byte(&ctx->g);
+ for (i = 0; i < 64; i++)
+ BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) = val;
+ } else { // copy block from previous frame
+ for (i = 0; i < 64; i++)
+ BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) =
+ BLK(ctx->prev, bx + (i & 0x7), by + (i >> 3));
+ }
+ } else { // handle four 4x4 subblocks
+ if (!bytestream2_get_bytes_left(&ctx->g)) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "Data overrun\n");
+ return AVERROR_INVALIDDATA;
+ }
+ for (i = 0; i < 4; i++) {
+ l0x = bx + (i & 1) * 4;
+ l0y = by + (i & 2) * 2;
+ kmvc_getbit(bb, &ctx->g, res);
+ if (!res) {
+ kmvc_getbit(bb, &ctx->g, res);
+ if (!res) { // fill whole 4x4 block
+ val = bytestream2_get_byte(&ctx->g);
+ for (j = 0; j < 16; j++)
+ BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) = val;
+ } else { // copy block
+ val = bytestream2_get_byte(&ctx->g);
+ mx = (val & 0xF) - 8;
+ my = (val >> 4) - 8;
+ if ((l0x+mx) + 320*(l0y+my) < 0 || (l0x+mx) + 320*(l0y+my) > 318*198) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
+ return AVERROR_INVALIDDATA;
+ }
+ for (j = 0; j < 16; j++)
+ BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) =
+ BLK(ctx->prev, l0x + (j & 3) + mx, l0y + (j >> 2) + my);
+ }
+ } else { // descend to 2x2 sub-sub-blocks
+ for (j = 0; j < 4; j++) {
+ l1x = l0x + (j & 1) * 2;
+ l1y = l0y + (j & 2);
+ kmvc_getbit(bb, &ctx->g, res);
+ if (!res) {
+ kmvc_getbit(bb, &ctx->g, res);
+ if (!res) { // fill whole 2x2 block
+ val = bytestream2_get_byte(&ctx->g);
+ BLK(ctx->cur, l1x, l1y) = val;
+ BLK(ctx->cur, l1x + 1, l1y) = val;
+ BLK(ctx->cur, l1x, l1y + 1) = val;
+ BLK(ctx->cur, l1x + 1, l1y + 1) = val;
+ } else { // copy block
+ val = bytestream2_get_byte(&ctx->g);
+ mx = (val & 0xF) - 8;
+ my = (val >> 4) - 8;
+ if ((l1x+mx) + 320*(l1y+my) < 0 || (l1x+mx) + 320*(l1y+my) > 318*198) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
+ return AVERROR_INVALIDDATA;
+ }
+ BLK(ctx->cur, l1x, l1y) = BLK(ctx->prev, l1x + mx, l1y + my);
+ BLK(ctx->cur, l1x + 1, l1y) =
+ BLK(ctx->prev, l1x + 1 + mx, l1y + my);
+ BLK(ctx->cur, l1x, l1y + 1) =
+ BLK(ctx->prev, l1x + mx, l1y + 1 + my);
+ BLK(ctx->cur, l1x + 1, l1y + 1) =
+ BLK(ctx->prev, l1x + 1 + mx, l1y + 1 + my);
+ }
+ } else { // read values for block
+ BLK(ctx->cur, l1x, l1y) = bytestream2_get_byte(&ctx->g);
+ BLK(ctx->cur, l1x + 1, l1y) = bytestream2_get_byte(&ctx->g);
+ BLK(ctx->cur, l1x, l1y + 1) = bytestream2_get_byte(&ctx->g);
+ BLK(ctx->cur, l1x + 1, l1y + 1) = bytestream2_get_byte(&ctx->g);
+ }
+ }
+ }
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int decode_frame(AVCodecContext * avctx, void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ KmvcContext *const ctx = avctx->priv_data;
+ AVFrame *frame = data;
+ uint8_t *out, *src;
+ int i, ret;
+ int header;
+ int blocksize;
+ const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
+
+ bytestream2_init(&ctx->g, avpkt->data, avpkt->size);
+
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+ return ret;
+
+ header = bytestream2_get_byte(&ctx->g);
+
+ /* blocksize 127 is really palette change event */
+ if (bytestream2_peek_byte(&ctx->g) == 127) {
+ bytestream2_skip(&ctx->g, 3);
+ for (i = 0; i < 127; i++) {
+ ctx->pal[i + (header & 0x81)] = 0xFFU << 24 | bytestream2_get_be24(&ctx->g);
+ bytestream2_skip(&ctx->g, 1);
+ }
+ bytestream2_seek(&ctx->g, -127 * 4 - 3, SEEK_CUR);
+ }
+
+ if (header & KMVC_KEYFRAME) {
+ frame->key_frame = 1;
+ frame->pict_type = AV_PICTURE_TYPE_I;
+ } else {
+ frame->key_frame = 0;
+ frame->pict_type = AV_PICTURE_TYPE_P;
+ }
+
+ if (header & KMVC_PALETTE) {
+ frame->palette_has_changed = 1;
+ // palette starts from index 1 and has 127 entries
+ for (i = 1; i <= ctx->palsize; i++) {
+ ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&ctx->g);
+ }
+ }
+
+ if (pal) {
+ frame->palette_has_changed = 1;
+ memcpy(ctx->pal, pal, AVPALETTE_SIZE);
+ }
+
+ if (ctx->setpal) {
+ ctx->setpal = 0;
+ frame->palette_has_changed = 1;
+ }
+
+ /* make the palette available on the way out */
+ memcpy(frame->data[1], ctx->pal, 1024);
+
+ blocksize = bytestream2_get_byte(&ctx->g);
+
+ if (blocksize != 8 && blocksize != 127) {
+ av_log(avctx, AV_LOG_ERROR, "Block size = %i\n", blocksize);
+ return AVERROR_INVALIDDATA;
+ }
+ memset(ctx->cur, 0, 320 * 200);
+ switch (header & KMVC_METHOD) {
+ case 0:
+ case 1: // used in palette changed event
+ memcpy(ctx->cur, ctx->prev, 320 * 200);
+ break;
+ case 3:
+ kmvc_decode_intra_8x8(ctx, avctx->width, avctx->height);
+ break;
+ case 4:
+ kmvc_decode_inter_8x8(ctx, avctx->width, avctx->height);
+ break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Unknown compression method %i\n", header & KMVC_METHOD);
+ return AVERROR_INVALIDDATA;
+ }
+
+ out = frame->data[0];
+ src = ctx->cur;
+ for (i = 0; i < avctx->height; i++) {
+ memcpy(out, src, avctx->width);
+ src += 320;
+ out += frame->linesize[0];
+ }
+
+ /* flip buffers */
+ if (ctx->cur == ctx->frm0) {
+ ctx->cur = ctx->frm1;
+ ctx->prev = ctx->frm0;
+ } else {
+ ctx->cur = ctx->frm0;
+ ctx->prev = ctx->frm1;
+ }
+
+ *got_frame = 1;
+
+ /* always report that the buffer was completely consumed */
+ return avpkt->size;
+}
+
+
+
+/*
+ * Init kmvc decoder
+ */
+static av_cold int decode_init(AVCodecContext * avctx)
+{
+ KmvcContext *const c = avctx->priv_data;
+ int i;
+
+ c->avctx = avctx;
+
+ if (avctx->width > 320 || avctx->height > 200) {
+ av_log(avctx, AV_LOG_ERROR, "KMVC supports frames <= 320x200\n");
+ return AVERROR(EINVAL);
+ }
+
+ c->frm0 = av_mallocz(320 * 200);
+ c->frm1 = av_mallocz(320 * 200);
+ c->cur = c->frm0;
+ c->prev = c->frm1;
+
+ for (i = 0; i < 256; i++) {
+ c->pal[i] = 0xFFU << 24 | i * 0x10101;
+ }
+
+ if (avctx->extradata_size < 12) {
+ av_log(avctx, AV_LOG_WARNING,
+ "Extradata missing, decoding may not work properly...\n");
+ c->palsize = 127;
+ } else {
+ c->palsize = AV_RL16(avctx->extradata + 10);
+ if (c->palsize >= (unsigned)MAX_PALSIZE) {
+ c->palsize = 127;
+ av_log(avctx, AV_LOG_ERROR, "KMVC palette too large\n");
+ return AVERROR_INVALIDDATA;
+ }
+ }
+
+ if (avctx->extradata_size == 1036) { // palette in extradata
+ uint8_t *src = avctx->extradata + 12;
+ for (i = 0; i < 256; i++) {
+ c->pal[i] = AV_RL32(src);
+ src += 4;
+ }
+ c->setpal = 1;
+ }
+
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+ return 0;
+}
+
+
+
+/*
+ * Uninit kmvc decoder
+ */
+static av_cold int decode_end(AVCodecContext * avctx)
+{
+ KmvcContext *const c = avctx->priv_data;
+
+ av_freep(&c->frm0);
+ av_freep(&c->frm1);
+
+ return 0;
+}
+
+AVCodec ff_kmvc_decoder = {
+ .name = "kmvc",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_KMVC,
+ .priv_data_size = sizeof(KmvcContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Karl Morton's video codec"),
+};
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