#include "avcodec.h"
#include "bytestream.h"
+#include "internal.h"
+#include "libavutil/common.h"
#define KMVC_KEYFRAME 0x80
#define KMVC_PALETTE 0x40
#define KMVC_METHOD 0x0F
+#define MAX_PALSIZE 256
/*
* Decoder context
*/
typedef struct KmvcContext {
AVCodecContext *avctx;
- AVFrame pic;
int setpal;
int palsize;
- uint32_t pal[256];
+ uint32_t pal[MAX_PALSIZE];
uint8_t *cur, *prev;
- uint8_t *frm0, *frm1;
+ uint8_t frm0[320 * 200], frm1[320 * 200];
+ GetByteContext g;
} KmvcContext;
typedef struct BitBuf {
int bitbuf;
} BitBuf;
-#define BLK(data, x, y) data[(x) + (y) * 320]
+#define BLK(data, x, y) data[av_clip((x) + (y) * 320, 0, 320 * 200 -1)]
-#define kmvc_init_getbits(bb, src) bb.bits = 7; bb.bitbuf = *src++;
+#define kmvc_init_getbits(bb, g) bb.bits = 7; bb.bitbuf = bytestream2_get_byte(g);
-#define kmvc_getbit(bb, src, res) {\
+#define kmvc_getbit(bb, g, res) {\
res = 0; \
if (bb.bitbuf & (1 << bb.bits)) res = 1; \
bb.bits--; \
if(bb.bits == -1) { \
- bb.bitbuf = *src++; \
+ bb.bitbuf = bytestream2_get_byte(g); \
bb.bits = 7; \
} \
}
-static void kmvc_decode_intra_8x8(KmvcContext * ctx, const uint8_t * src, int w, int h)
+static int kmvc_decode_intra_8x8(KmvcContext * ctx, int w, int h)
{
BitBuf bb;
int res, val;
int l0x, l1x, l0y, l1y;
int mx, my;
- kmvc_init_getbits(bb, src);
+ kmvc_init_getbits(bb, &ctx->g);
for (by = 0; by < h; by += 8)
for (bx = 0; bx < w; bx += 8) {
- kmvc_getbit(bb, src, res);
+ 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 = *src++;
+ 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, src, res);
+ kmvc_getbit(bb, &ctx->g, res);
if (!res) {
- kmvc_getbit(bb, src, res);
+ kmvc_getbit(bb, &ctx->g, res);
if (!res) { // fill whole 4x4 block
- val = *src++;
+ 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 = *src++;
+ val = bytestream2_get_byte(&ctx->g);
mx = val & 0xF;
my = val >> 4;
for (j = 0; j < 16; j++)
for (j = 0; j < 4; j++) {
l1x = l0x + (j & 1) * 2;
l1y = l0y + (j & 2);
- kmvc_getbit(bb, src, res);
+ kmvc_getbit(bb, &ctx->g, res);
if (!res) {
- kmvc_getbit(bb, src, res);
+ kmvc_getbit(bb, &ctx->g, res);
if (!res) { // fill whole 2x2 block
- val = *src++;
+ 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 = *src++;
+ val = bytestream2_get_byte(&ctx->g);
mx = val & 0xF;
my = val >> 4;
BLK(ctx->cur, l1x, l1y) = BLK(ctx->cur, l1x - mx, l1y - my);
BLK(ctx->cur, l1x + 1 - mx, l1y + 1 - my);
}
} else { // read values for block
- BLK(ctx->cur, l1x, l1y) = *src++;
- BLK(ctx->cur, l1x + 1, l1y) = *src++;
- BLK(ctx->cur, l1x, l1y + 1) = *src++;
- BLK(ctx->cur, l1x + 1, l1y + 1) = *src++;
+ 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 void kmvc_decode_inter_8x8(KmvcContext * ctx, const uint8_t * src, int w, int h)
+static int kmvc_decode_inter_8x8(KmvcContext * ctx, int w, int h)
{
BitBuf bb;
int res, val;
int l0x, l1x, l0y, l1y;
int mx, my;
- kmvc_init_getbits(bb, src);
+ kmvc_init_getbits(bb, &ctx->g);
for (by = 0; by < h; by += 8)
for (bx = 0; bx < w; bx += 8) {
- kmvc_getbit(bb, src, res);
+ kmvc_getbit(bb, &ctx->g, res);
if (!res) {
- kmvc_getbit(bb, src, res);
+ kmvc_getbit(bb, &ctx->g, res);
if (!res) { // fill whole 8x8 block
- val = *src++;
+ 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
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, src, res);
+ kmvc_getbit(bb, &ctx->g, res);
if (!res) {
- kmvc_getbit(bb, src, res);
+ kmvc_getbit(bb, &ctx->g, res);
if (!res) { // fill whole 4x4 block
- val = *src++;
+ 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 = *src++;
+ val = bytestream2_get_byte(&ctx->g);
mx = (val & 0xF) - 8;
my = (val >> 4) - 8;
for (j = 0; j < 16; j++)
for (j = 0; j < 4; j++) {
l1x = l0x + (j & 1) * 2;
l1y = l0y + (j & 2);
- kmvc_getbit(bb, src, res);
+ kmvc_getbit(bb, &ctx->g, res);
if (!res) {
- kmvc_getbit(bb, src, res);
+ kmvc_getbit(bb, &ctx->g, res);
if (!res) { // fill whole 2x2 block
- val = *src++;
+ 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 = *src++;
+ val = bytestream2_get_byte(&ctx->g);
mx = (val & 0xF) - 8;
my = (val >> 4) - 8;
BLK(ctx->cur, l1x, l1y) = BLK(ctx->prev, l1x + mx, l1y + my);
BLK(ctx->prev, l1x + 1 + mx, l1y + 1 + my);
}
} else { // read values for block
- BLK(ctx->cur, l1x, l1y) = *src++;
- BLK(ctx->cur, l1x + 1, l1y) = *src++;
- BLK(ctx->cur, l1x, l1y + 1) = *src++;
- BLK(ctx->cur, l1x + 1, l1y + 1) = *src++;
+ 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 *data_size, AVPacket *avpkt)
+static int decode_frame(AVCodecContext * avctx, void *data, int *got_frame,
+ AVPacket *avpkt)
{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
KmvcContext *const ctx = avctx->priv_data;
+ AVFrame *frame = data;
uint8_t *out, *src;
- int i;
+ int i, ret;
int header;
int blocksize;
+ const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
- if (ctx->pic.data[0])
- avctx->release_buffer(avctx, &ctx->pic);
+ bytestream2_init(&ctx->g, avpkt->data, avpkt->size);
- ctx->pic.reference = 1;
- ctx->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
- if (avctx->get_buffer(avctx, &ctx->pic) < 0) {
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return -1;
+ return ret;
}
- header = *buf++;
+ header = bytestream2_get_byte(&ctx->g);
/* blocksize 127 is really palette change event */
- if (buf[0] == 127) {
- buf += 3;
+ if (bytestream2_peek_byte(&ctx->g) == 127) {
+ bytestream2_skip(&ctx->g, 3);
for (i = 0; i < 127; i++) {
- ctx->pal[i + (header & 0x81)] = AV_RB24(buf);
- buf += 4;
+ ctx->pal[i + (header & 0x81)] = bytestream2_get_be24(&ctx->g);
+ bytestream2_skip(&ctx->g, 1);
}
- buf -= 127 * 4 + 3;
+ bytestream2_seek(&ctx->g, -127 * 4 - 3, SEEK_CUR);
}
if (header & KMVC_KEYFRAME) {
- ctx->pic.key_frame = 1;
- ctx->pic.pict_type = FF_I_TYPE;
+ frame->key_frame = 1;
+ frame->pict_type = AV_PICTURE_TYPE_I;
} else {
- ctx->pic.key_frame = 0;
- ctx->pic.pict_type = FF_P_TYPE;
- }
-
- /* if palette has been changed, copy it from palctrl */
- if (ctx->avctx->palctrl && ctx->avctx->palctrl->palette_changed) {
- memcpy(ctx->pal, ctx->avctx->palctrl->palette, AVPALETTE_SIZE);
- ctx->setpal = 1;
- ctx->avctx->palctrl->palette_changed = 0;
+ frame->key_frame = 0;
+ frame->pict_type = AV_PICTURE_TYPE_P;
}
if (header & KMVC_PALETTE) {
- ctx->pic.palette_has_changed = 1;
+ frame->palette_has_changed = 1;
// palette starts from index 1 and has 127 entries
for (i = 1; i <= ctx->palsize; i++) {
- ctx->pal[i] = bytestream_get_be24(&buf);
+ ctx->pal[i] = bytestream2_get_be24(&ctx->g);
}
}
+ if (pal) {
+ frame->palette_has_changed = 1;
+ memcpy(ctx->pal, pal, AVPALETTE_SIZE);
+ }
+
if (ctx->setpal) {
ctx->setpal = 0;
- ctx->pic.palette_has_changed = 1;
+ frame->palette_has_changed = 1;
}
/* make the palette available on the way out */
- memcpy(ctx->pic.data[1], ctx->pal, 1024);
+ memcpy(frame->data[1], ctx->pal, 1024);
- blocksize = *buf++;
+ blocksize = bytestream2_get_byte(&ctx->g);
if (blocksize != 8 && blocksize != 127) {
av_log(avctx, AV_LOG_ERROR, "Block size = %i\n", blocksize);
- return -1;
+ return AVERROR_INVALIDDATA;
}
memset(ctx->cur, 0, 320 * 200);
switch (header & KMVC_METHOD) {
memcpy(ctx->cur, ctx->prev, 320 * 200);
break;
case 3:
- kmvc_decode_intra_8x8(ctx, buf, avctx->width, avctx->height);
+ kmvc_decode_intra_8x8(ctx, avctx->width, avctx->height);
break;
case 4:
- kmvc_decode_inter_8x8(ctx, buf, avctx->width, avctx->height);
+ 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 -1;
+ return AVERROR_INVALIDDATA;
}
- out = ctx->pic.data[0];
+ out = frame->data[0];
src = ctx->cur;
for (i = 0; i < avctx->height; i++) {
memcpy(out, src, avctx->width);
src += 320;
- out += ctx->pic.linesize[0];
+ out += frame->linesize[0];
}
/* flip buffers */
ctx->prev = ctx->frm1;
}
- *data_size = sizeof(AVFrame);
- *(AVFrame *) data = ctx->pic;
+ *got_frame = 1;
/* always report that the buffer was completely consumed */
- return buf_size;
+ return avpkt->size;
}
if (avctx->width > 320 || avctx->height > 200) {
av_log(avctx, AV_LOG_ERROR, "KMVC supports frames <= 320x200\n");
- return -1;
+ return AVERROR(EINVAL);
}
- c->frm0 = av_mallocz(320 * 200);
- c->frm1 = av_mallocz(320 * 200);
c->cur = c->frm0;
c->prev = c->frm1;
}
if (avctx->extradata_size < 12) {
- av_log(NULL, 0, "Extradata missing, decoding may not work properly...\n");
+ 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 >= MAX_PALSIZE) {
+ av_log(avctx, AV_LOG_ERROR, "KMVC palette too large\n");
+ return AVERROR_INVALIDDATA;
+ }
}
if (avctx->extradata_size == 1036) { // palette in extradata
src += 4;
}
c->setpal = 1;
- if (c->avctx->palctrl) {
- c->avctx->palctrl->palette_changed = 0;
- }
}
- avctx->pix_fmt = 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);
- if (c->pic.data[0])
- avctx->release_buffer(avctx, &c->pic);
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
return 0;
}
AVCodec ff_kmvc_decoder = {
- "kmvc",
- AVMEDIA_TYPE_VIDEO,
- CODEC_ID_KMVC,
- sizeof(KmvcContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("Karl Morton's video codec"),
+ .name = "kmvc",
+ .long_name = NULL_IF_CONFIG_SMALL("Karl Morton's video codec"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_KMVC,
+ .priv_data_size = sizeof(KmvcContext),
+ .init = decode_init,
+ .decode = decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
};