* Micrsoft RLE Video Decoder
* Copyright (C) 2003 the ffmpeg project
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file msrle.c
+ * @file libavcodec/msrle.c
* MS RLE Video Decoder by Mike Melanson (melanson@pcisys.net)
* For more information about the MS RLE format, visit:
* http://www.pcisys.net/~melanson/codecs/
#include <string.h>
#include <unistd.h>
-#include "common.h"
#include "avcodec.h"
#include "dsputil.h"
+#include "msrledec.h"
typedef struct MsrleContext {
AVCodecContext *avctx;
AVFrame frame;
- AVFrame prev_frame;
- unsigned char *buf;
+ const unsigned char *buf;
int size;
} MsrleContext;
-#define FETCH_NEXT_STREAM_BYTE() \
- if (stream_ptr >= s->size) \
- { \
- av_log(s->avctx, AV_LOG_ERROR, " MS RLE: stream ptr just went out of bounds (1)\n"); \
- return; \
- } \
- stream_byte = s->buf[stream_ptr++];
-
-static void msrle_decode_pal8(MsrleContext *s)
+static av_cold int msrle_decode_init(AVCodecContext *avctx)
{
- int stream_ptr = 0;
- unsigned char rle_code;
- unsigned char extra_byte;
- unsigned char stream_byte;
- int pixel_ptr = 0;
- int row_dec = s->frame.linesize[0];
- int row_ptr = (s->avctx->height - 1) * row_dec;
- int frame_size = row_dec * s->avctx->height;
-
- while (row_ptr >= 0) {
- FETCH_NEXT_STREAM_BYTE();
- rle_code = stream_byte;
- if (rle_code == 0) {
- /* fetch the next byte to see how to handle escape code */
- FETCH_NEXT_STREAM_BYTE();
- if (stream_byte == 0) {
- /* line is done, goto the next one */
- row_ptr -= row_dec;
- pixel_ptr = 0;
- } else if (stream_byte == 1) {
- /* decode is done */
- return;
- } else if (stream_byte == 2) {
- /* reposition frame decode coordinates */
- FETCH_NEXT_STREAM_BYTE();
- pixel_ptr += stream_byte;
- FETCH_NEXT_STREAM_BYTE();
- row_ptr -= stream_byte * row_dec;
- } else {
- /* copy pixels from encoded stream */
- if ((row_ptr + pixel_ptr + stream_byte > frame_size) ||
- (row_ptr < 0)) {
- av_log(s->avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n");
- return;
- }
-
- rle_code = stream_byte;
- extra_byte = stream_byte & 0x01;
- if (stream_ptr + rle_code + extra_byte > s->size) {
- av_log(s->avctx, AV_LOG_ERROR, " MS RLE: stream ptr just went out of bounds (2)\n");
- return;
- }
-
- while (rle_code--) {
- FETCH_NEXT_STREAM_BYTE();
- s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
- pixel_ptr++;
- }
-
- /* if the RLE code is odd, skip a byte in the stream */
- if (extra_byte)
- stream_ptr++;
- }
- } else {
- /* decode a run of data */
- if ((row_ptr + pixel_ptr + stream_byte > frame_size) ||
- (row_ptr < 0)) {
- av_log(s->avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (2)\n");
- return;
- }
-
- FETCH_NEXT_STREAM_BYTE();
-
- while(rle_code--) {
- s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
- pixel_ptr++;
- }
- }
- }
-
- /* make the palette available */
- memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
- if (s->avctx->palctrl->palette_changed) {
- s->frame.palette_has_changed = 1;
- s->avctx->palctrl->palette_changed = 0;
- }
-
- /* one last sanity check on the way out */
- if (stream_ptr < s->size)
- av_log(s->avctx, AV_LOG_ERROR, " MS RLE: ended frame decode with bytes left over (%d < %d)\n",
- stream_ptr, s->size);
-}
-
-static int msrle_decode_init(AVCodecContext *avctx)
-{
- MsrleContext *s = (MsrleContext *)avctx->priv_data;
+ MsrleContext *s = avctx->priv_data;
s->avctx = avctx;
avctx->pix_fmt = PIX_FMT_PAL8;
- avctx->has_b_frames = 0;
- s->frame.data[0] = s->prev_frame.data[0] = NULL;
+ s->frame.data[0] = NULL;
return 0;
}
static int msrle_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
- MsrleContext *s = (MsrleContext *)avctx->priv_data;
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ MsrleContext *s = avctx->priv_data;
s->buf = buf;
s->size = buf_size;
s->frame.reference = 1;
- if (avctx->get_buffer(avctx, &s->frame)) {
- av_log(avctx, AV_LOG_ERROR, " MS RLE: get_buffer() failed\n");
+ s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
+ if (avctx->reget_buffer(avctx, &s->frame)) {
+ av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return -1;
}
- if (s->prev_frame.data[0] && (s->frame.linesize[0] != s->prev_frame.linesize[0]))
- av_log(avctx, AV_LOG_ERROR, " MS RLE: Buffer linesize changed: current %u, previous %u.\n"
- " Expect wrong image and/or crash!\n",
- s->frame.linesize[0], s->prev_frame.linesize[0]);
-
- /* grossly inefficient, but...oh well */
- if (s->prev_frame.data[0] != NULL)
- memcpy(s->frame.data[0], s->prev_frame.data[0],
- s->frame.linesize[0] * s->avctx->height);
-
- msrle_decode_pal8(s);
-
- if (s->prev_frame.data[0])
- avctx->release_buffer(avctx, &s->prev_frame);
+ if (s->avctx->palctrl) {
+ /* make the palette available */
+ memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
+ if (s->avctx->palctrl->palette_changed) {
+ s->frame.palette_has_changed = 1;
+ s->avctx->palctrl->palette_changed = 0;
+ }
+ }
- /* shuffle frames */
- s->prev_frame = s->frame;
+ ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, buf, buf_size);
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
return buf_size;
}
-static int msrle_decode_end(AVCodecContext *avctx)
+static av_cold int msrle_decode_end(AVCodecContext *avctx)
{
- MsrleContext *s = (MsrleContext *)avctx->priv_data;
+ MsrleContext *s = avctx->priv_data;
/* release the last frame */
- if (s->prev_frame.data[0])
- avctx->release_buffer(avctx, &s->prev_frame);
+ if (s->frame.data[0])
+ avctx->release_buffer(avctx, &s->frame);
return 0;
}
msrle_decode_end,
msrle_decode_frame,
CODEC_CAP_DR1,
+ .long_name= NULL_IF_CONFIG_SMALL("Microsoft RLE"),
};
projects / frescor / ffmpeg.git / blobdiff