* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#define BITSTREAM_READER_LE
#include "avcodec.h"
+#include "bytestream.h"
+#include "get_bits.h"
#include "internal.h"
+#include "unary.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
-static av_cold int decode_init(AVCodecContext *avctx)
-{
- avctx->pix_fmt = AV_PIX_FMT_YUV420P;
- avctx->coded_frame = avcodec_alloc_frame();
- if (!avctx->coded_frame)
- return AVERROR(ENOMEM);
-
- return 0;
-}
-
-static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
- AVPacket *avpkt)
+static int dxtory_decode_v1(AVCodecContext *avctx, AVFrame *pic,
+ const uint8_t *src, int src_size)
{
int h, w;
- AVFrame *pic = avctx->coded_frame;
- const uint8_t *src = avpkt->data;
uint8_t *Y1, *Y2, *U, *V;
int ret;
- if (pic->data[0])
- avctx->release_buffer(avctx, pic);
-
- if (avpkt->size < avctx->width * avctx->height * 3 / 2 + 16) {
+ if (src_size < avctx->width * avctx->height * 3 / 2) {
av_log(avctx, AV_LOG_ERROR, "packet too small\n");
return AVERROR_INVALIDDATA;
}
- pic->reference = 0;
- if ((ret = ff_get_buffer(avctx, pic)) < 0)
+ avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+ if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
return ret;
- pic->pict_type = AV_PICTURE_TYPE_I;
- pic->key_frame = 1;
-
- if (AV_RL32(src) != 0x01000002) {
- av_log_ask_for_sample(avctx, "Unknown frame header %X\n", AV_RL32(src));
- return AVERROR_PATCHWELCOME;
- }
- src += 16;
-
Y1 = pic->data[0];
Y2 = pic->data[0] + pic->linesize[0];
U = pic->data[1];
V += pic->linesize[2];
}
- *got_frame = 1;
- *(AVFrame*)data = *pic;
+ return 0;
+}
- return avpkt->size;
+const uint8_t def_lru[8] = { 0x00, 0x20, 0x40, 0x60, 0x80, 0xA0, 0xC0, 0xFF };
+
+static inline uint8_t decode_sym(GetBitContext *gb, uint8_t lru[8])
+{
+ uint8_t c, val;
+
+ c = get_unary(gb, 0, 8);
+ if (!c) {
+ val = get_bits(gb, 8);
+ memmove(lru + 1, lru, sizeof(*lru) * (8 - 1));
+ } else {
+ val = lru[c - 1];
+ memmove(lru + 1, lru, sizeof(*lru) * (c - 1));
+ }
+ lru[0] = val;
+
+ return val;
+}
+
+static int dx2_decode_slice(GetBitContext *gb, int width, int height,
+ uint8_t *Y, uint8_t *U, uint8_t *V,
+ int ystride, int ustride, int vstride)
+{
+ int x, y, i;
+ uint8_t lru[3][8];
+
+ for (i = 0; i < 3; i++)
+ memcpy(lru[i], def_lru, 8 * sizeof(*def_lru));
+
+ for (y = 0; y < height; y+=2) {
+ for (x = 0; x < width; x += 2) {
+ Y[x + 0 + 0 * ystride] = decode_sym(gb, lru[0]);
+ Y[x + 1 + 0 * ystride] = decode_sym(gb, lru[0]);
+ Y[x + 0 + 1 * ystride] = decode_sym(gb, lru[0]);
+ Y[x + 1 + 1 * ystride] = decode_sym(gb, lru[0]);
+ U[x >> 1] = decode_sym(gb, lru[1]) ^ 0x80;
+ V[x >> 1] = decode_sym(gb, lru[2]) ^ 0x80;
+ }
+
+ Y += ystride << 1;
+ U += ustride;
+ V += vstride;
+ }
+
+ return 0;
}
-static av_cold int decode_close(AVCodecContext *avctx)
+static int dxtory_decode_v2(AVCodecContext *avctx, AVFrame *pic,
+ const uint8_t *src, int src_size)
{
- AVFrame *pic = avctx->coded_frame;
- if (pic->data[0])
- avctx->release_buffer(avctx, pic);
- av_freep(&avctx->coded_frame);
+ GetByteContext gb;
+ GetBitContext gb2;
+ int nslices, slice, slice_height;
+ uint32_t off, slice_size;
+ uint8_t *Y, *U, *V;
+ int ret;
+
+ bytestream2_init(&gb, src, src_size);
+ nslices = bytestream2_get_le16(&gb);
+ off = FFALIGN(nslices * 4 + 2, 16);
+ if (src_size < off) {
+ av_log(avctx, AV_LOG_ERROR, "no slice data\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (!nslices || avctx->height % nslices) {
+ avpriv_request_sample(avctx, "%d slices for %dx%d", nslices,
+ avctx->width, avctx->height);
+ return AVERROR(ENOSYS);
+ }
+
+ slice_height = avctx->height / nslices;
+ if ((avctx->width & 1) || (slice_height & 1)) {
+ avpriv_request_sample(avctx, "slice dimensions %dx%d",
+ avctx->width, slice_height);
+ }
+
+ avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+ if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
+ return ret;
+
+ Y = pic->data[0];
+ U = pic->data[1];
+ V = pic->data[2];
+
+ for (slice = 0; slice < nslices; slice++) {
+ slice_size = bytestream2_get_le32(&gb);
+ if (slice_size > src_size - off) {
+ av_log(avctx, AV_LOG_ERROR,
+ "invalid slice size %d (only %d bytes left)\n",
+ slice_size, src_size - off);
+ return AVERROR_INVALIDDATA;
+ }
+ if (slice_size <= 16) {
+ av_log(avctx, AV_LOG_ERROR, "invalid slice size %d\n", slice_size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (AV_RL32(src + off) != slice_size - 16) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Slice sizes mismatch: got %d instead of %d\n",
+ AV_RL32(src + off), slice_size - 16);
+ }
+ init_get_bits(&gb2, src + off + 16, (slice_size - 16) * 8);
+ dx2_decode_slice(&gb2, avctx->width, slice_height, Y, U, V,
+ pic->linesize[0], pic->linesize[1], pic->linesize[2]);
+
+ Y += pic->linesize[0] * slice_height;
+ U += pic->linesize[1] * (slice_height >> 1);
+ V += pic->linesize[2] * (slice_height >> 1);
+ off += slice_size;
+ }
return 0;
}
+static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ AVFrame *pic = data;
+ const uint8_t *src = avpkt->data;
+ int ret;
+
+ if (avpkt->size < 16) {
+ av_log(avctx, AV_LOG_ERROR, "packet too small\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ switch (AV_RB32(src)) {
+ case 0x02000001:
+ ret = dxtory_decode_v1(avctx, pic, src + 16, avpkt->size - 16);
+ break;
+ case 0x02000009:
+ ret = dxtory_decode_v2(avctx, pic, src + 16, avpkt->size - 16);
+ break;
+ default:
+ avpriv_request_sample(avctx, "Frame header %X", AV_RB32(src));
+ return AVERROR_PATCHWELCOME;
+ }
+
+ if (ret)
+ return ret;
+
+ pic->pict_type = AV_PICTURE_TYPE_I;
+ pic->key_frame = 1;
+ *got_frame = 1;
+
+ return avpkt->size;
+}
+
AVCodec ff_dxtory_decoder = {
.name = "dxtory",
.long_name = NULL_IF_CONFIG_SMALL("Dxtory"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_DXTORY,
- .init = decode_init,
- .close = decode_close,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
};
projects / ffmpeg / blobdiff