*/
/**
- * @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 "avcodec.h"
#include "dsputil.h"
+#include "msrledec.h"
typedef struct MsrleContext {
AVCodecContext *avctx;
} 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_pal4(MsrleContext *s)
-{
- int stream_ptr = 0;
- unsigned char rle_code;
- unsigned char extra_byte, odd_pixel;
- 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;
- int i;
-
- /* 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;
- }
-
- 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
- odd_pixel = stream_byte & 1;
- rle_code = (stream_byte + 1) / 2;
- extra_byte = rle_code & 0x01;
- 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;
- }
-
- for (i = 0; i < rle_code; i++) {
- if (pixel_ptr >= s->avctx->width)
- break;
- FETCH_NEXT_STREAM_BYTE();
- s->frame.data[0][row_ptr + pixel_ptr] = stream_byte >> 4;
- pixel_ptr++;
- if (i + 1 == rle_code && odd_pixel)
- break;
- if (pixel_ptr >= s->avctx->width)
- break;
- s->frame.data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F;
- 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 (1)\n");
- return;
- }
- FETCH_NEXT_STREAM_BYTE();
- for (i = 0; i < rle_code; i++) {
- if (pixel_ptr >= s->avctx->width)
- break;
- if ((i & 1) == 0)
- s->frame.data[0][row_ptr + pixel_ptr] = stream_byte >> 4;
- else
- s->frame.data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F;
- pixel_ptr++;
- }
- }
- }
-
- /* 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 void msrle_decode_pal8(MsrleContext *s)
-{
- 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;
-
- /* 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;
- }
-
- 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++;
- }
- }
- }
-
- /* 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 av_cold int msrle_decode_init(AVCodecContext *avctx)
{
MsrleContext *s = avctx->priv_data;
static int msrle_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- const uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
MsrleContext *s = avctx->priv_data;
s->buf = buf;
return -1;
}
- switch (avctx->bits_per_sample) {
- case 8:
- msrle_decode_pal8(s);
- break;
- case 4:
- msrle_decode_pal4(s);
- break;
- default:
- av_log(avctx, AV_LOG_ERROR, "Don't know how to decode depth %u.\n",
- avctx->bits_per_sample);
+ 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;
}
+ }
+
+ ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, buf, buf_size);
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
msrle_decode_end,
msrle_decode_frame,
CODEC_CAP_DR1,
+ .long_name= NULL_IF_CONFIG_SMALL("Microsoft RLE"),
};
projects / frescor / ffmpeg.git / blobdiff