/*
- * Micrsoft RLE Video Decoder
+ * Microsoft 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 Libav.
+ *
+ * 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 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,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file msrle.c
- * MS RLE Video Decoder by Mike Melanson (melanson@pcisys.net)
+ * @file
+ * 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/
*
* The MS RLE decoder outputs PAL8 colorspace data.
- *
- * Note that this decoder expects the palette colors from the end of the
- * BITMAPINFO header passed through extradata.
*/
#include <stdio.h>
#include <stdlib.h>
#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;
+ GetByteContext gb;
+ const unsigned char *buf;
int size;
- unsigned int palette[256];
+ uint32_t pal[256];
} MsrleContext;
-#define FETCH_NEXT_STREAM_BYTE() \
- if (stream_ptr >= s->size) \
- { \
- printf(" 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)) {
- printf(" 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) {
- printf(" 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)) {
- printf(" 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->palette, 256 * 4);
-
- /* one last sanity check on the way out */
- if (stream_ptr < s->size)
- printf(" 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;
- int i, j;
- unsigned char *palette;
+ 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;
+ switch (avctx->bits_per_coded_sample) {
+ case 4:
+ case 8:
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
+ break;
+ case 24:
+ avctx->pix_fmt = AV_PIX_FMT_BGR24;
+ break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n");
+ return -1;
+ }
- /* convert palette */
- palette = (unsigned char *)s->avctx->extradata;
- memset (s->palette, 0, 256 * 4);
- for (i = 0, j = 0; i < s->avctx->extradata_size / 4; i++, j += 4)
- s->palette[i] =
- (palette[j + 2] << 16) |
- (palette[j + 1] << 8) |
- (palette[j + 0] << 0);
+ 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;
+ int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8;
s->buf = buf;
s->size = buf_size;
- if (avctx->get_buffer(avctx, &s->frame)) {
- printf (" MS RLE: get_buffer() failed\n");
+ s->frame.reference = 1;
+ 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;
}
- /* grossly inefficient, but...oh well */
- memcpy(s->frame.data[0], s->prev_frame.data[0],
- s->frame.linesize[0] * s->avctx->height);
+ if (avctx->bits_per_coded_sample <= 8) {
+ const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
- msrle_decode_pal8(s);
+ if (pal) {
+ s->frame.palette_has_changed = 1;
+ memcpy(s->pal, pal, AVPALETTE_SIZE);
+ }
- if (s->frame.data[0])
- avctx->release_buffer(avctx, &s->frame);
+ /* make the palette available */
+ memcpy(s->frame.data[1], s->pal, AVPALETTE_SIZE);
+ }
- /* shuffle frames */
- s->prev_frame = s->frame;
+ /* FIXME how to correctly detect RLE ??? */
+ if (avctx->height * istride == avpkt->size) { /* assume uncompressed */
+ int linesize = avctx->width * avctx->bits_per_coded_sample / 8;
+ uint8_t *ptr = s->frame.data[0];
+ uint8_t *buf = avpkt->data + (avctx->height-1)*istride;
+ int i, j;
+
+ for (i = 0; i < avctx->height; i++) {
+ if (avctx->bits_per_coded_sample == 4) {
+ for (j = 0; j < avctx->width - 1; j += 2) {
+ ptr[j+0] = buf[j>>1] >> 4;
+ ptr[j+1] = buf[j>>1] & 0xF;
+ }
+ if (avctx->width & 1)
+ ptr[j+0] = buf[j>>1] >> 4;
+ } else {
+ memcpy(ptr, buf, linesize);
+ }
+ buf -= istride;
+ ptr += s->frame.linesize[0];
+ }
+ } else {
+ bytestream2_init(&s->gb, buf, buf_size);
+ ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, &s->gb);
+ }
*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;
}
-AVCodec msrle_decoder = {
- "msrle",
- CODEC_TYPE_VIDEO,
- CODEC_ID_MSRLE,
- sizeof(MsrleContext),
- msrle_decode_init,
- NULL,
- msrle_decode_end,
- msrle_decode_frame,
- CODEC_CAP_DR1,
+AVCodec ff_msrle_decoder = {
+ .name = "msrle",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_MSRLE,
+ .priv_data_size = sizeof(MsrleContext),
+ .init = msrle_decode_init,
+ .close = msrle_decode_end,
+ .decode = msrle_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Microsoft RLE"),
};
projects / ffmpeg / blobdiff