* Kega Game Video (KGV1) decoder
* Copyright (c) 2010 Daniel Verkamp
*
- * 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
*/
* Kega Game Video decoder
*/
+#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
+#include "internal.h"
-typedef struct {
+typedef struct KgvContext {
AVCodecContext *avctx;
- AVFrame pic;
- uint16_t *prev, *cur;
+ uint16_t *frame_buffer;
+ uint16_t *last_frame_buffer;
} KgvContext;
-static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
+static void decode_flush(AVCodecContext *avctx)
{
+ KgvContext * const c = avctx->priv_data;
+
+ av_freep(&c->frame_buffer);
+ av_freep(&c->last_frame_buffer);
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
const uint8_t *buf_end = buf + avpkt->size;
KgvContext * const c = avctx->priv_data;
- int offsets[7];
+ int offsets[8];
uint16_t *out, *prev;
int outcnt = 0, maxcnt;
- int w, h, i;
+ int w, h, i, res;
if (avpkt->size < 2)
- return -1;
+ return AVERROR_INVALIDDATA;
w = (buf[0] + 1) * 8;
h = (buf[1] + 1) * 8;
buf += 2;
- if (av_image_check_size(w, h, 0, avctx))
- return -1;
+ if (w != avctx->width || h != avctx->height) {
+ av_freep(&c->frame_buffer);
+ av_freep(&c->last_frame_buffer);
+ if ((res = ff_set_dimensions(avctx, w, h)) < 0)
+ return res;
+ }
- if (w != avctx->width || h != avctx->height)
- avcodec_set_dimensions(avctx, w, h);
+ if (!c->frame_buffer) {
+ c->frame_buffer = av_mallocz(avctx->width * avctx->height * 2);
+ c->last_frame_buffer = av_mallocz(avctx->width * avctx->height * 2);
+ if (!c->frame_buffer || !c->last_frame_buffer) {
+ decode_flush(avctx);
+ return AVERROR(ENOMEM);
+ }
+ }
maxcnt = w * h;
- out = av_realloc(c->cur, w * h * 2);
- if (!out)
- return -1;
- c->cur = out;
-
- prev = av_realloc(c->prev, w * h * 2);
- if (!prev)
- return -1;
- c->prev = prev;
+ if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
+ return res;
+ out = c->frame_buffer;
+ prev = c->last_frame_buffer;
- for (i = 0; i < 7; i++)
+ for (i = 0; i < 8; i++)
offsets[i] = -1;
while (outcnt < maxcnt && buf_end - 2 > buf) {
out[outcnt++] = code; // rgb555 pixel coded directly
} else {
int count;
+ int inp_off;
uint16_t *inp;
if ((code & 0x6000) == 0x6000) {
if (maxcnt - start < count)
break;
- inp = prev + start;
+ if (!prev) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Frame reference does not exist\n");
+ break;
+ }
+
+ inp = prev;
+ inp_off = start;
} else {
// copy from earlier in this frame
int offset = (code & 0x1FFF) + 1;
if (outcnt < offset)
break;
- inp = out + outcnt - offset;
+ inp = out;
+ inp_off = outcnt - offset;
}
if (maxcnt - outcnt < count)
break;
- for (i = 0; i < count; i++)
+ for (i = inp_off; i < count + inp_off; i++) {
out[outcnt++] = inp[i];
+ }
}
}
if (outcnt - maxcnt)
av_log(avctx, AV_LOG_DEBUG, "frame finished with %d diff\n", outcnt - maxcnt);
- c->pic.data[0] = (uint8_t *)c->cur;
- c->pic.linesize[0] = w * 2;
+ av_image_copy_plane(frame->data[0], frame->linesize[0],
+ (const uint8_t*)c->frame_buffer, avctx->width * 2,
+ avctx->width * 2, avctx->height);
+ FFSWAP(uint16_t *, c->frame_buffer, c->last_frame_buffer);
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = c->pic;
-
- FFSWAP(uint16_t *, c->cur, c->prev);
+ *got_frame = 1;
return avpkt->size;
}
KgvContext * const c = avctx->priv_data;
c->avctx = avctx;
- avctx->pix_fmt = PIX_FMT_RGB555;
+ avctx->pix_fmt = AV_PIX_FMT_RGB555;
return 0;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
- KgvContext * const c = avctx->priv_data;
-
- av_freep(&c->cur);
- av_freep(&c->prev);
-
+ decode_flush(avctx);
return 0;
}
AVCodec ff_kgv1_decoder = {
- "kgv1",
- AVMEDIA_TYPE_VIDEO,
- CODEC_ID_KGV1,
- sizeof(KgvContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- .max_lowres = 1,
- .long_name = NULL_IF_CONFIG_SMALL("Kega Game Video"),
+ .name = "kgv1",
+ .long_name = NULL_IF_CONFIG_SMALL("Kega Game Video"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_KGV1,
+ .priv_data_size = sizeof(KgvContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .flush = decode_flush,
+ .capabilities = AV_CODEC_CAP_DR1,
};
projects / ffmpeg / blobdiff