IFF: decode last 8 pixels per line
[libav.git] / libavcodec / iff.c
index e628c5e..d23837e 100644 (file)
 
 typedef struct {
     AVFrame frame;
-    unsigned planesize;
+    int planesize;
     uint8_t * planebuf;
 } IffContext;
 
+#define LUT8_PART(plane, v)                             \
+    AV_LE2ME64C(UINT64_C(0x0000000)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x1000000)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x0010000)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x1010000)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x0000100)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x1000100)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x0010100)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x1010100)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x0000001)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x1000001)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x0010001)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x1010001)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x0000101)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x1000101)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x0010101)<<32 | v) << plane,  \
+    AV_LE2ME64C(UINT64_C(0x1010101)<<32 | v) << plane
+
+#define LUT8(plane) {                           \
+    LUT8_PART(plane, 0x0000000),                \
+    LUT8_PART(plane, 0x1000000),                \
+    LUT8_PART(plane, 0x0010000),                \
+    LUT8_PART(plane, 0x1010000),                \
+    LUT8_PART(plane, 0x0000100),                \
+    LUT8_PART(plane, 0x1000100),                \
+    LUT8_PART(plane, 0x0010100),                \
+    LUT8_PART(plane, 0x1010100),                \
+    LUT8_PART(plane, 0x0000001),                \
+    LUT8_PART(plane, 0x1000001),                \
+    LUT8_PART(plane, 0x0010001),                \
+    LUT8_PART(plane, 0x1010001),                \
+    LUT8_PART(plane, 0x0000101),                \
+    LUT8_PART(plane, 0x1000101),                \
+    LUT8_PART(plane, 0x0010101),                \
+    LUT8_PART(plane, 0x1010101),                \
+}
+
+// 8 planes * 8-bit mask
+static const uint64_t plane8_lut[8][256] = {
+    LUT8(0), LUT8(1), LUT8(2), LUT8(3),
+    LUT8(4), LUT8(5), LUT8(6), LUT8(7),
+};
+
 /**
  * Convert CMAP buffer (stored in extradata) to lavc palette format
  */
 int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
 {
-    unsigned count, i;
+    int count, i;
 
     if (avctx->bits_per_coded_sample > 8) {
         av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
@@ -72,7 +115,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
         return AVERROR_INVALIDDATA;
     }
 
-    s->planesize = avctx->width >> 3;
+    s->planesize = FFALIGN(avctx->width, 16) >> 3; // Align plane size in bits to word-boundary
     s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
     if (!s->planebuf)
         return AVERROR(ENOMEM);
@@ -95,14 +138,13 @@ static av_cold int decode_init(AVCodecContext *avctx)
  * @param bps bits_per_coded_sample (must be <= 8)
  * @param plane plane number to decode as
  */
-static void decodeplane8(uint8_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
+static void decodeplane8(uint8_t *dst, const uint8_t *buf, int buf_size, int bps, int plane)
 {
-    GetBitContext gb;
-    unsigned int i;
-    const unsigned b = (buf_size * 8) + bps - 1;
-    init_get_bits(&gb, buf, buf_size * 8);
-    for(i = 0; i < b; i++) {
-        dst[i] |= get_bits1(&gb) << plane;
+    const uint64_t *lut = plane8_lut[plane];
+    while (buf_size--) {
+        uint64_t v = AV_RN64A(dst) | lut[*buf++];
+        AV_WN64A(dst, v);
+        dst += 8;
     }
 }
 
@@ -117,8 +159,8 @@ static void decodeplane8(uint8_t *dst, const uint8_t *const buf, int buf_size, i
 static void decodeplane32(uint32_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
 {
     GetBitContext gb;
-    unsigned i;
-    const unsigned b = (buf_size * 8) + bps - 1;
+    int i;
+    const int b = buf_size * 8;
     init_get_bits(&gb, buf, buf_size * 8);
     for(i = 0; i < b; i++) {
         dst[i] |= get_bits1(&gb) << plane;
@@ -131,9 +173,9 @@ static int decode_frame_ilbm(AVCodecContext *avctx,
 {
     IffContext *s = avctx->priv_data;
     const uint8_t *buf = avpkt->data;
-    unsigned buf_size = avpkt->size;
+    int buf_size = avpkt->size;
     const uint8_t *buf_end = buf+buf_size;
-    unsigned y, plane;
+    int y, plane;
 
     if (avctx->reget_buffer(avctx, &s->frame) < 0){
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
@@ -141,21 +183,21 @@ static int decode_frame_ilbm(AVCodecContext *avctx,
     }
 
     if (avctx->pix_fmt == PIX_FMT_PAL8) {
-    for(y = 0; y < avctx->height; y++ ) {
-        uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
-        memset(row, 0, avctx->width);
-        for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
+        for(y = 0; y < avctx->height; y++ ) {
+            uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
+            memset(row, 0, avctx->width);
+            for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
                 decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
                 buf += s->planesize;
             }
         }
-            } else { // PIX_FMT_BGR32
+    } else { // PIX_FMT_BGR32
         for(y = 0; y < avctx->height; y++ ) {
             uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
             memset(row, 0, avctx->width << 2);
             for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
                 decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
-            buf += s->planesize;
+                buf += s->planesize;
             }
         }
     }
@@ -171,9 +213,9 @@ static int decode_frame_byterun1(AVCodecContext *avctx,
 {
     IffContext *s = avctx->priv_data;
     const uint8_t *buf = avpkt->data;
-    unsigned buf_size = avpkt->size;
+    int buf_size = avpkt->size;
     const uint8_t *buf_end = buf+buf_size;
-    unsigned y, plane, x;
+    int y, plane, x;
 
     if (avctx->reget_buffer(avctx, &s->frame) < 0){
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
@@ -182,29 +224,29 @@ static int decode_frame_byterun1(AVCodecContext *avctx,
 
     if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
         if (avctx->pix_fmt == PIX_FMT_PAL8) {
-    for(y = 0; y < avctx->height ; y++ ) {
-        uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
-            memset(row, 0, avctx->width);
-            for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
-                for(x = 0; x < s->planesize && buf < buf_end; ) {
-                    int8_t value = *buf++;
-                    unsigned length;
-                    if (value >= 0) {
-                        length = value + 1;
-                        memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
-                        buf += length;
-                    } else if (value > -128) {
-                        length = -value + 1;
-                        memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
-                    } else { //noop
-                        continue;
+            for(y = 0; y < avctx->height ; y++ ) {
+                uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
+                memset(row, 0, avctx->width);
+                for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
+                    for(x = 0; x < s->planesize && buf < buf_end; ) {
+                        int8_t value = *buf++;
+                        unsigned length;
+                        if (value >= 0) {
+                            length = value + 1;
+                            memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
+                            buf += length;
+                        } else if (value > -128) {
+                            length = -value + 1;
+                            memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
+                        } else { //noop
+                            continue;
+                        }
+                        x += length;
                     }
-                    x += length;
-                }
                     decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
                 }
             }
-                } else { //PIX_FMT_BGR32
+        } else { //PIX_FMT_BGR32
             for(y = 0; y < avctx->height ; y++ ) {
                 uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
                 memset(row, 0, avctx->width << 2);
@@ -228,9 +270,9 @@ static int decode_frame_byterun1(AVCodecContext *avctx,
                 }
             }
         }
-        } else {
-            for(y = 0; y < avctx->height ; y++ ) {
-                uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
+    } else {
+        for(y = 0; y < avctx->height ; y++ ) {
+            uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
             for(x = 0; x < avctx->width && buf < buf_end; ) {
                 int8_t value = *buf++;
                 unsigned length;