* Bethesda VID video decoder
* Copyright (C) 2007 Nicholas Tung
*
- * 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 bethsoftvideo.c
+ * @file
* @brief Bethesda Softworks VID Video Decoder
* @author Nicholas Tung [ntung (at. ntung com] (2007-03)
- * @sa http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
- * @sa http://www.svatopluk.com/andux/docs/dfvid.html
+ * @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
+ * @see http://www.svatopluk.com/andux/docs/dfvid.html
*/
-#include "common.h"
-#include "dsputil.h"
+#include "libavutil/common.h"
+#include "avcodec.h"
#include "bethsoftvideo.h"
#include "bytestream.h"
+#include "internal.h"
typedef struct BethsoftvidContext {
- AVFrame frame;
+ AVFrame *frame;
+ GetByteContext g;
} BethsoftvidContext;
-static int bethsoftvid_decode_init(AVCodecContext *avctx)
+static av_cold int bethsoftvid_decode_init(AVCodecContext *avctx)
{
BethsoftvidContext *vid = avctx->priv_data;
- vid->frame.reference = 1;
- vid->frame.buffer_hints = FF_BUFFER_HINTS_VALID |
- FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
- avctx->pix_fmt = PIX_FMT_PAL8; // palette in vid->frame.data[1]
- av_log(avctx, AV_LOG_DEBUG, "[bethsoftvid video decoder] init\n");
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+ vid->frame = av_frame_alloc();
+ if (!vid->frame)
+ return AVERROR(ENOMEM);
+
return 0;
}
-static void set_palette(AVFrame * frame, uint8_t * palette_buffer)
+static int set_palette(BethsoftvidContext *ctx)
{
- uint32_t * palette = (uint32_t *)frame->data[1];
+ uint32_t *palette = (uint32_t *)ctx->frame->data[1];
int a;
- for(a = 0; a < VID_PALETTE_NUMCOLORS; a++)
- {
- palette[a] = AV_RB24(&palette_buffer[a * 3]) * 4; // multiply all colors by 4
+
+ if (bytestream2_get_bytes_left(&ctx->g) < 256*3)
+ return AVERROR_INVALIDDATA;
+
+ for(a = 0; a < 256; a++){
+ palette[a] = bytestream2_get_be24u(&ctx->g) * 4;
}
- frame->palette_has_changed = 1;
+ ctx->frame->palette_has_changed = 1;
+ return 0;
}
static int bethsoftvid_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ void *data, int *got_frame,
+ AVPacket *avpkt)
{
BethsoftvidContext * vid = avctx->priv_data;
char block_type;
- uint8_t * destination;
+ uint8_t * dst;
uint8_t * frame_end;
- int line_remaining = avctx->width; // number of bytes remaining on a line
- const int wrap_to_next_line = vid->frame.linesize[0] - avctx->width;
- uint8_t rle_num_bytes;
+ int remaining = avctx->width; // number of bytes remaining on a line
+ int wrap_to_next_line;
+ int code, ret;
int yoffset;
- av_log(avctx, AV_LOG_DEBUG, "[bethsoftvid video decoder] decoding frame\n");
-
- // reget buffer will copy old data, good for simple difference frames
- if (avctx->reget_buffer(avctx, &vid->frame)) {
+ if ((ret = ff_reget_buffer(avctx, vid->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
- return -1;
+ return ret;
}
- destination = vid->frame.data[0];
- frame_end = vid->frame.data[0] + vid->frame.linesize[0] * avctx->height;
-
- switch(block_type = *buf++)
- {
- case PALETTE_BLOCK: set_palette(&vid->frame, buf); return 0;
- case VIDEO_YOFFSET_DIFFERENCE_FRAME_BLOCK:
- yoffset = bytestream_get_le16(&buf);
- if(yoffset >= avctx->height) { return -1; }
- destination += vid->frame.linesize[0] * yoffset;
+ wrap_to_next_line = vid->frame->linesize[0] - avctx->width;
+
+ if (avpkt->side_data_elems > 0 &&
+ avpkt->side_data[0].type == AV_PKT_DATA_PALETTE) {
+ bytestream2_init(&vid->g, avpkt->side_data[0].data,
+ avpkt->side_data[0].size);
+ if ((ret = set_palette(vid)) < 0)
+ return ret;
+ }
+
+ bytestream2_init(&vid->g, avpkt->data, avpkt->size);
+ dst = vid->frame->data[0];
+ frame_end = vid->frame->data[0] + vid->frame->linesize[0] * avctx->height;
+
+ switch(block_type = bytestream2_get_byte(&vid->g)){
+ case PALETTE_BLOCK: {
+ *got_frame = 0;
+ if ((ret = set_palette(vid)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "error reading palette\n");
+ return ret;
+ }
+ return bytestream2_tell(&vid->g);
+ }
+ case VIDEO_YOFF_P_FRAME:
+ yoffset = bytestream2_get_le16(&vid->g);
+ if(yoffset >= avctx->height)
+ return AVERROR_INVALIDDATA;
+ dst += vid->frame->linesize[0] * yoffset;
}
// main code
- while((rle_num_bytes = *buf++))
- {
- int length = rle_num_bytes & 0x7f;
+ while((code = bytestream2_get_byte(&vid->g))){
+ int length = code & 0x7f;
// copy any bytes starting at the current position, and ending at the frame width
- while(length > line_remaining)
- {
- if(rle_num_bytes < 0x80) { bytestream_get_buffer(&buf, destination, line_remaining); }
- else if(block_type == VIDEO_FULL_FRAME_BLOCK) { memset(destination, buf[0], line_remaining); }
- length -= line_remaining; // decrement the number of bytes to be copied
- destination += line_remaining + wrap_to_next_line; // skip over extra bytes at end of frame
- line_remaining = avctx->width;
- if(destination == frame_end) { goto end; }
+ while(length > remaining){
+ if(code < 0x80)
+ bytestream2_get_buffer(&vid->g, dst, remaining);
+ else if(block_type == VIDEO_I_FRAME)
+ memset(dst, bytestream2_peek_byte(&vid->g), remaining);
+ length -= remaining; // decrement the number of bytes to be copied
+ dst += remaining + wrap_to_next_line; // skip over extra bytes at end of frame
+ remaining = avctx->width;
+ if(dst == frame_end)
+ goto end;
}
// copy any remaining bytes after / if line overflows
- if(rle_num_bytes < 0x80) { bytestream_get_buffer(&buf, destination, length); }
- else if(block_type == VIDEO_FULL_FRAME_BLOCK) { memset(destination, *buf++, length); }
- line_remaining -= length;
- destination += length;
+ if(code < 0x80)
+ bytestream2_get_buffer(&vid->g, dst, length);
+ else if(block_type == VIDEO_I_FRAME)
+ memset(dst, bytestream2_get_byte(&vid->g), length);
+ remaining -= length;
+ dst += length;
}
end:
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = vid->frame;
+ if ((ret = av_frame_ref(data, vid->frame)) < 0)
+ return ret;
+
+ *got_frame = 1;
- return buf_size;
+ return avpkt->size;
}
-static int bethsoftvid_decode_end(AVCodecContext *avctx)
+static av_cold int bethsoftvid_decode_end(AVCodecContext *avctx)
{
BethsoftvidContext * vid = avctx->priv_data;
- av_log(avctx, AV_LOG_DEBUG, "[bethsoftvid video decoder] closing\n");
- if(vid->frame.data[0]) { avctx->release_buffer(avctx, &vid->frame); }
+ av_frame_free(&vid->frame);
return 0;
}
-AVCodec bethsoftvid_decoder = {
- .name = "bethsoftvid",
- .type = CODEC_TYPE_VIDEO,
- .id = CODEC_ID_BETHSOFTVID,
+AVCodec ff_bethsoftvid_decoder = {
+ .name = "bethsoftvid",
+ .long_name = NULL_IF_CONFIG_SMALL("Bethesda VID video"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_BETHSOFTVID,
.priv_data_size = sizeof(BethsoftvidContext),
- .init = bethsoftvid_decode_init,
- .close = bethsoftvid_decode_end,
- .decode = bethsoftvid_decode_frame,
+ .init = bethsoftvid_decode_init,
+ .close = bethsoftvid_decode_end,
+ .decode = bethsoftvid_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
};
projects / ffmpeg / blobdiff