* Beam Software VB decoder
* Copyright (c) 2007 Konstantin Shishkov
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavcodec/vb.c
+ * @file
* VB Video decoder
*/
#include "avcodec.h"
#include "bytestream.h"
+#include "internal.h"
-enum VBFlags{
+enum VBFlags {
VB_HAS_GMC = 0x01,
VB_HAS_AUDIO = 0x04,
VB_HAS_VIDEO = 0x08,
typedef struct VBDecContext {
AVCodecContext *avctx;
- AVFrame pic;
uint8_t *frame, *prev_frame;
uint32_t pal[AVPALETTE_COUNT];
- const uint8_t *stream;
+ GetByteContext stream;
} VBDecContext;
static const uint16_t vb_patterns[64] = {
{
int start, size, i;
- start = bytestream_get_byte(&c->stream);
- size = (bytestream_get_byte(&c->stream) - 1) & 0xFF;
- if(start + size > 255){
+ start = bytestream2_get_byte(&c->stream);
+ size = (bytestream2_get_byte(&c->stream) - 1) & 0xFF;
+ if (start + size > 255) {
av_log(c->avctx, AV_LOG_ERROR, "Palette change runs beyond entry 256\n");
return;
}
- if(size*3+2 > data_size){
+ if (size*3+2 > data_size) {
av_log(c->avctx, AV_LOG_ERROR, "Palette data runs beyond chunk size\n");
return;
}
- for(i = start; i <= start + size; i++)
- c->pal[i] = bytestream_get_be24(&c->stream);
+ for (i = start; i <= start + size; i++)
+ c->pal[i] = bytestream2_get_be24(&c->stream);
}
static inline int check_pixel(uint8_t *buf, uint8_t *start, uint8_t *end)
return buf >= start && (buf + 4) <= end;
}
-static int vb_decode_framedata(VBDecContext *c, const uint8_t *buf, int data_size, int offset)
+static int vb_decode_framedata(VBDecContext *c, int offset)
{
+ GetByteContext g;
uint8_t *prev, *cur;
- const uint8_t* data_end = buf + data_size;
int blk, blocks, t, blk2;
int blocktypes = 0;
int x, y, a, b;
int pattype, pattern;
const int width = c->avctx->width;
uint8_t *pstart = c->prev_frame;
- uint8_t *pend = c->prev_frame + width*c->avctx->height;
+ uint8_t *pend = c->prev_frame + width*c->avctx->height;
+
+ g = c->stream;
prev = c->prev_frame + offset;
- cur = c->frame;
+ cur = c->frame;
blocks = (c->avctx->width >> 2) * (c->avctx->height >> 2);
- blk2 = 0;
- for(blk = 0; blk < blocks; blk++){
- if(!(blk & 3)) {
- if(buf >= data_end){
- av_log(c->avctx, AV_LOG_ERROR, "Data pointer out of bounds\n");
- return -1;
- }
- blocktypes = bytestream_get_byte(&buf);
+ blk2 = 0;
+ for (blk = 0; blk < blocks; blk++) {
+ if (!(blk & 3)) {
+ blocktypes = bytestream2_get_byte(&g);
}
- switch(blocktypes & 0xC0){
+ switch (blocktypes & 0xC0) {
case 0x00: //skip
- for(y = 0; y < 4; y++)
- if(check_line(prev + y*width, pstart, pend))
+ for (y = 0; y < 4; y++)
+ if (check_line(prev + y*width, pstart, pend))
memcpy(cur + y*width, prev + y*width, 4);
else
memset(cur + y*width, 0, 4);
break;
case 0x40:
- t = bytestream_get_byte(&buf);
- if(!t){ //raw block
- if(buf + 16 > data_end){
+ t = bytestream2_get_byte(&g);
+ if (!t) { //raw block
+ if (bytestream2_get_bytes_left(&g) < 16) {
av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
- for(y = 0; y < 4; y++)
- memcpy(cur + y*width, buf + y*4, 4);
- buf += 16;
- }else{ // motion compensation
+ for (y = 0; y < 4; y++)
+ bytestream2_get_buffer(&g, cur + y * width, 4);
+ } else { // motion compensation
x = ((t & 0xF)^8) - 8;
y = ((t >> 4) ^8) - 8;
t = x + y*width;
- for(y = 0; y < 4; y++)
- if(check_line(prev + t + y*width, pstart, pend))
+ for (y = 0; y < 4; y++)
+ if (check_line(prev + t + y*width, pstart, pend))
memcpy(cur + y*width, prev + t + y*width, 4);
else
memset(cur + y*width, 0, 4);
}
break;
case 0x80: // fill
- t = bytestream_get_byte(&buf);
- for(y = 0; y < 4; y++)
+ t = bytestream2_get_byte(&g);
+ for (y = 0; y < 4; y++)
memset(cur + y*width, t, 4);
break;
case 0xC0: // pattern fill
- if(buf + 2 > data_end){
- av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
- return -1;
- }
- t = bytestream_get_byte(&buf);
+ t = bytestream2_get_byte(&g);
pattype = t >> 6;
pattern = vb_patterns[t & 0x3F];
- switch(pattype){
+ switch (pattype) {
case 0:
- a = bytestream_get_byte(&buf);
- b = bytestream_get_byte(&buf);
- for(y = 0; y < 4; y++)
- for(x = 0; x < 4; x++, pattern >>= 1)
+ a = bytestream2_get_byte(&g);
+ b = bytestream2_get_byte(&g);
+ for (y = 0; y < 4; y++)
+ for (x = 0; x < 4; x++, pattern >>= 1)
cur[x + y*width] = (pattern & 1) ? b : a;
break;
case 1:
pattern = ~pattern;
case 2:
- a = bytestream_get_byte(&buf);
- for(y = 0; y < 4; y++)
- for(x = 0; x < 4; x++, pattern >>= 1)
- if(pattern & 1 && check_pixel(prev + x + y*width, pstart, pend))
+ a = bytestream2_get_byte(&g);
+ for (y = 0; y < 4; y++)
+ for (x = 0; x < 4; x++, pattern >>= 1)
+ if (pattern & 1 && check_pixel(prev + x + y*width, pstart, pend))
cur[x + y*width] = prev[x + y*width];
else
cur[x + y*width] = a;
break;
case 3:
- av_log(c->avctx, AV_LOG_ERROR, "Invalid opcode seen @%d\n",blk);
- return -1;
+ av_log(c->avctx, AV_LOG_ERROR, "Invalid opcode seen @%d\n", blk);
+ return AVERROR_INVALIDDATA;
}
break;
}
cur += 4;
prev += 4;
blk2++;
- if(blk2 == (width >> 2)){
- blk2 = 0;
+ if (blk2 == (width >> 2)) {
+ blk2 = 0;
cur += width * 3;
prev += width * 3;
}
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;
VBDecContext * const c = avctx->priv_data;
+ AVFrame *frame = data;
uint8_t *outptr, *srcptr;
- int i, j;
+ int i, j, ret;
int flags;
uint32_t size;
- int rest = buf_size;
int offset = 0;
- if(c->pic.data[0])
- avctx->release_buffer(avctx, &c->pic);
- c->pic.reference = 1;
- if(avctx->get_buffer(avctx, &c->pic) < 0){
+ bytestream2_init(&c->stream, avpkt->data, avpkt->size);
+
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return -1;
+ return ret;
}
- c->stream = buf;
- flags = bytestream_get_le16(&c->stream);
- rest -= 2;
+ flags = bytestream2_get_le16(&c->stream);
- if(flags & VB_HAS_GMC){
- i = (int16_t)bytestream_get_le16(&c->stream);
- j = (int16_t)bytestream_get_le16(&c->stream);
+ if (flags & VB_HAS_GMC) {
+ i = (int16_t)bytestream2_get_le16(&c->stream);
+ j = (int16_t)bytestream2_get_le16(&c->stream);
offset = i + j * avctx->width;
- rest -= 4;
}
- if(flags & VB_HAS_VIDEO){
- size = bytestream_get_le32(&c->stream);
- if(size > rest){
- av_log(avctx, AV_LOG_ERROR, "Frame size is too big\n");
- return -1;
- }
- vb_decode_framedata(c, c->stream, size, offset);
- c->stream += size - 4;
- rest -= size;
+ if (flags & VB_HAS_VIDEO) {
+ size = bytestream2_get_le32(&c->stream);
+ vb_decode_framedata(c, offset);
+ bytestream2_skip(&c->stream, size - 4);
}
- if(flags & VB_HAS_PALETTE){
- size = bytestream_get_le32(&c->stream);
- if(size > rest){
- av_log(avctx, AV_LOG_ERROR, "Palette size is too big\n");
- return -1;
- }
+ if (flags & VB_HAS_PALETTE) {
+ size = bytestream2_get_le32(&c->stream);
vb_decode_palette(c, size);
- rest -= size;
}
- memcpy(c->pic.data[1], c->pal, AVPALETTE_SIZE);
- c->pic.palette_has_changed = flags & VB_HAS_PALETTE;
+ memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
+ frame->palette_has_changed = flags & VB_HAS_PALETTE;
- outptr = c->pic.data[0];
+ outptr = frame->data[0];
srcptr = c->frame;
- for(i = 0; i < avctx->height; i++){
+ for (i = 0; i < avctx->height; i++) {
memcpy(outptr, srcptr, avctx->width);
srcptr += avctx->width;
- outptr += c->pic.linesize[0];
+ outptr += frame->linesize[0];
}
FFSWAP(uint8_t*, c->frame, c->prev_frame);
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = c->pic;
+ *got_frame = 1;
/* always report that the buffer was completely consumed */
- return buf_size;
+ return avpkt->size;
}
static av_cold int decode_init(AVCodecContext *avctx)
{
VBDecContext * const c = avctx->priv_data;
- c->avctx = avctx;
- avctx->pix_fmt = PIX_FMT_PAL8;
+ c->avctx = avctx;
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
c->frame = av_mallocz(avctx->width * avctx->height);
c->prev_frame = av_mallocz(avctx->width * avctx->height);
av_freep(&c->frame);
av_freep(&c->prev_frame);
- if(c->pic.data[0])
- avctx->release_buffer(avctx, &c->pic);
return 0;
}
-AVCodec vb_decoder = {
- "vb",
- CODEC_TYPE_VIDEO,
- CODEC_ID_VB,
- sizeof(VBDecContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("Beam Software VB"),
+AVCodec ff_vb_decoder = {
+ .name = "vb",
+ .long_name = NULL_IF_CONFIG_SMALL("Beam Software VB"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_VB,
+ .priv_data_size = sizeof(VBDecContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
};
-
projects / ffmpeg / blobdiff