* Brute Force & Ignorance (BFI) video decoder
* Copyright (c) 2008 Sisir Koppaka
*
- * 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/bfi.c
+ * @file
* @brief Brute Force & Ignorance (.bfi) video decoder
* @author Sisir Koppaka ( sisir.koppaka at gmail dot com )
- * @sa http://wiki.multimedia.cx/index.php?title=BFI
+ * @see http://wiki.multimedia.cx/index.php?title=BFI
*/
#include "libavutil/common.h"
#include "avcodec.h"
#include "bytestream.h"
+#include "internal.h"
typedef struct BFIContext {
AVCodecContext *avctx;
- AVFrame frame;
uint8_t *dst;
} BFIContext;
-static av_cold int bfi_decode_init(AVCodecContext * avctx)
+static av_cold int bfi_decode_init(AVCodecContext *avctx)
{
BFIContext *bfi = avctx->priv_data;
- avctx->pix_fmt = PIX_FMT_PAL8;
- bfi->dst = av_mallocz(avctx->width * avctx->height);
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
+ bfi->dst = av_mallocz(avctx->width * avctx->height);
return 0;
}
-static int bfi_decode_frame(AVCodecContext * avctx, void *data,
- int *data_size, AVPacket *avpkt)
+static int bfi_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame, AVPacket *avpkt)
{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
+ AVFrame *frame = data;
+ GetByteContext g;
+ int buf_size = avpkt->size;
BFIContext *bfi = avctx->priv_data;
- uint8_t *dst = bfi->dst;
+ uint8_t *dst = bfi->dst;
uint8_t *src, *dst_offset, colour1, colour2;
uint8_t *frame_end = bfi->dst + avctx->width * avctx->height;
uint32_t *pal;
- int i, j, height = avctx->height;
+ int i, j, ret, height = avctx->height;
- if (bfi->frame.data[0])
- avctx->release_buffer(avctx, &bfi->frame);
-
- bfi->frame.reference = 1;
-
- if (avctx->get_buffer(avctx, &bfi->frame) < 0) {
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return -1;
+ return ret;
}
+ bytestream2_init(&g, avpkt->data, buf_size);
+
/* Set frame parameters and palette, if necessary */
if (!avctx->frame_number) {
- bfi->frame.pict_type = FF_I_TYPE;
- bfi->frame.key_frame = 1;
+ frame->pict_type = AV_PICTURE_TYPE_I;
+ frame->key_frame = 1;
/* Setting the palette */
- if(avctx->extradata_size>768) {
+ if (avctx->extradata_size > 768) {
av_log(NULL, AV_LOG_ERROR, "Palette is too large.\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
- pal = (uint32_t *) bfi->frame.data[1];
+ pal = (uint32_t *)frame->data[1];
for (i = 0; i < avctx->extradata_size / 3; i++) {
int shift = 16;
*pal = 0;
for (j = 0; j < 3; j++, shift -= 8)
- *pal +=
- ((avctx->extradata[i * 3 + j] << 2) |
- (avctx->extradata[i * 3 + j] >> 4)) << shift;
+ *pal += ((avctx->extradata[i * 3 + j] << 2) |
+ (avctx->extradata[i * 3 + j] >> 4)) << shift;
pal++;
}
- bfi->frame.palette_has_changed = 1;
+ frame->palette_has_changed = 1;
} else {
- bfi->frame.pict_type = FF_P_TYPE;
- bfi->frame.key_frame = 0;
+ frame->pict_type = AV_PICTURE_TYPE_P;
+ frame->key_frame = 0;
}
- buf += 4; //Unpacked size, not required.
+ bytestream2_skip(&g, 4); // Unpacked size, not required.
while (dst != frame_end) {
- static const uint8_t lentab[4]={0,2,0,1};
- unsigned int byte = *buf++, av_uninit(offset);
- unsigned int code = byte >> 6;
+ static const uint8_t lentab[4] = { 0, 2, 0, 1 };
+ unsigned int byte = bytestream2_get_byte(&g), av_uninit(offset);
+ unsigned int code = byte >> 6;
unsigned int length = byte & ~0xC0;
- /* Get length and offset(if required) */
+ if (!bytestream2_get_bytes_left(&g)) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Input resolution larger than actual frame.\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ /* Get length and offset (if required) */
if (length == 0) {
if (code == 1) {
- length = bytestream_get_byte(&buf);
- offset = bytestream_get_le16(&buf);
+ length = bytestream2_get_byte(&g);
+ offset = bytestream2_get_le16(&g);
} else {
- length = bytestream_get_le16(&buf);
+ length = bytestream2_get_le16(&g);
if (code == 2 && length == 0)
break;
}
} else {
if (code == 1)
- offset = bytestream_get_byte(&buf);
+ offset = bytestream2_get_byte(&g);
}
/* Do boundary check */
- if (dst + (length<<lentab[code]) > frame_end)
+ if (dst + (length << lentab[code]) > frame_end)
break;
switch (code) {
-
- case 0: //Normal Chain
- bytestream_get_buffer(&buf, dst, length);
+ case 0: // normal chain
+ if (length >= bytestream2_get_bytes_left(&g)) {
+ av_log(avctx, AV_LOG_ERROR, "Frame larger than buffer.\n");
+ return AVERROR_INVALIDDATA;
+ }
+ bytestream2_get_buffer(&g, dst, length);
dst += length;
break;
-
- case 1: //Back Chain
+ case 1: // back chain
dst_offset = dst - offset;
- length *= 4; //Convert dwords to bytes.
+ length *= 4; // Convert dwords to bytes.
if (dst_offset < bfi->dst)
break;
while (length--)
*dst++ = *dst_offset++;
break;
-
- case 2: //Skip Chain
+ case 2: // skip chain
dst += length;
break;
-
- case 3: //Fill Chain
- colour1 = bytestream_get_byte(&buf);
- colour2 = bytestream_get_byte(&buf);
+ case 3: // fill chain
+ colour1 = bytestream2_get_byte(&g);
+ colour2 = bytestream2_get_byte(&g);
while (length--) {
*dst++ = colour1;
*dst++ = colour2;
}
break;
-
}
}
src = bfi->dst;
- dst = bfi->frame.data[0];
+ dst = frame->data[0];
while (height--) {
memcpy(dst, src, avctx->width);
src += avctx->width;
- dst += bfi->frame.linesize[0];
+ dst += frame->linesize[0];
}
- *data_size = sizeof(AVFrame);
- *(AVFrame *) data = bfi->frame;
+ *got_frame = 1;
+
return buf_size;
}
-static av_cold int bfi_decode_close(AVCodecContext * avctx)
+static av_cold int bfi_decode_close(AVCodecContext *avctx)
{
BFIContext *bfi = avctx->priv_data;
- if (bfi->frame.data[0])
- avctx->release_buffer(avctx, &bfi->frame);
av_free(bfi->dst);
return 0;
}
-AVCodec bfi_decoder = {
- .name = "bfi",
- .type = CODEC_TYPE_VIDEO,
- .id = CODEC_ID_BFI,
+AVCodec ff_bfi_decoder = {
+ .name = "bfi",
+ .long_name = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_BFI,
.priv_data_size = sizeof(BFIContext),
- .init = bfi_decode_init,
- .close = bfi_decode_close,
- .decode = bfi_decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),
+ .init = bfi_decode_init,
+ .close = bfi_decode_close,
+ .decode = bfi_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
};
projects / ffmpeg / blobdiff