added Apple Graphics (SMC) decoder

Originally committed as revision 2488 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -18,7 +18,8 @@ OBJS= common.o utils.o mem.o allcodecs.o \
       fft.o mdct.o mace.o huffyuv.o cyuv.o opts.o raw.o h264.o golomb.o \
       vp3.o asv1.o 4xm.o cabac.o ffv1.o ra144.o ra288.o vcr1.o cljr.o \
       roqvideo.o dpcm.o interplayvideo.o xan.o rpza.o cinepak.o msrle.o \
-      msvideo1.o vqavideo.o idcinvideo.o adx.o rational.o faandct.o 8bps.o
+      msvideo1.o vqavideo.o idcinvideo.o adx.o rational.o faandct.o 8bps.o \
+      smc.o
 
 ifeq ($(AMR_NB),yes)
 ifeq ($(AMR_NB_FIXED),yes)

libavcodec/allcodecs.c

@@ -135,6 +135,7 @@ void avcodec_register_all(void)
     register_avcodec(&vqa_decoder);
     register_avcodec(&idcin_decoder);
     register_avcodec(&eightbps_decoder);
+    register_avcodec(&smc_decoder);
 #ifdef CONFIG_AC3
     register_avcodec(&ac3_decoder);
 #endif

libavcodec/avcodec.h

@@ -84,6 +84,7 @@ enum CodecID {
     CODEC_ID_MSVIDEO1,
     CODEC_ID_IDCIN,
     CODEC_ID_8BPS,
+    CODEC_ID_SMC,
 
     /* various pcm "codecs" */
     CODEC_ID_PCM_S16LE,
@@ -1568,6 +1569,7 @@ extern AVCodec msvideo1_decoder;
 extern AVCodec vqa_decoder;
 extern AVCodec idcin_decoder;
 extern AVCodec eightbps_decoder;
+extern AVCodec smc_decoder;
 extern AVCodec ra_144_decoder;
 extern AVCodec ra_288_decoder;
 extern AVCodec roq_dpcm_decoder;

libavcodec/smc.c

@@ -0,0 +1,510 @@
+/*
+ * Quicktime Graphics (SMC) Video Decoder
+ * Copyright (C) 2003 the ffmpeg project
+ *
+ * This library 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.
+ *
+ * This library 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
+ *
+ */
+
+/**
+ * @file smc.c
+ * QT SMC Video Decoder by Mike Melanson (melanson@pcisys.net)
+ * For more information about the SMC format, visit:
+ *   http://www.pcisys.net/~melanson/codecs/
+ *
+ * The SMC decoder outputs PAL8 colorspace data.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "avcodec.h"
+#include "dsputil.h"
+
+#define CPAIR 2
+#define CQUAD 4
+#define COCTET 8
+
+#define COLORS_PER_TABLE 256
+
+typedef struct SmcContext {
+
+    AVCodecContext *avctx;
+    DSPContext dsp;
+    AVFrame frame;
+    AVFrame prev_frame;
+
+    unsigned char *buf;
+    int size;
+
+    /* SMC color tables */
+    unsigned char color_pairs[COLORS_PER_TABLE * CPAIR];
+    unsigned char color_quads[COLORS_PER_TABLE * CQUAD];
+    unsigned char color_octets[COLORS_PER_TABLE * COCTET];
+
+} SmcContext;
+
+#define BE_16(x)  ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
+#define BE_32(x)  ((((uint8_t*)(x))[0] << 24) | \
+                   (((uint8_t*)(x))[1] << 16) | \
+                   (((uint8_t*)(x))[2] << 8) | \
+                    ((uint8_t*)(x))[3])
+#define GET_BLOCK_COUNT() \
+  (opcode & 0x10) ? (1 + s->buf[stream_ptr++]) : 1 + (opcode & 0x0F);
+
+#define ADVANCE_BLOCK() \
+{ \
+    pixel_ptr += 4; \
+    if (pixel_ptr >= width) \
+    { \
+        pixel_ptr = 0; \
+        row_ptr += stride * 4; \
+    } \
+    total_blocks--; \
+    if (total_blocks < 0) \
+    { \
+        printf("warning: block counter just went negative (this should not happen)\n"); \
+        return; \
+    } \
+}
+
+static void smc_decode_stream(SmcContext *s)
+{
+    int width = s->avctx->width;
+    int height = s->avctx->height;
+    int stride = s->frame.linesize[0];
+    int i;
+    int stream_ptr = 0;
+    int chunk_size;
+    unsigned char opcode;
+    int n_blocks;
+    unsigned int color_flags;
+    unsigned int color_flags_a;
+    unsigned int color_flags_b;
+    unsigned int flag_mask;
+
+    unsigned char *pixels = s->frame.data[0];
+    unsigned char *prev_pixels = s->prev_frame.data[0];
+
+    int image_size = height * s->frame.linesize[0];
+    int row_ptr = 0;
+    int pixel_ptr = 0;
+    int pixel_x, pixel_y;
+    int row_inc = stride - 4;
+    int block_ptr;
+    int prev_block_ptr;
+    int prev_block_ptr1, prev_block_ptr2;
+    int prev_block_flag;
+    int total_blocks;
+    int color_table_index;  /* indexes to color pair, quad, or octet tables */
+    int pixel;
+
+    int color_pair_index = 0;
+    int color_quad_index = 0;
+    int color_octet_index = 0;
+
+    /* 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;
+    }
+
+    chunk_size = BE_32(&s->buf[stream_ptr]) & 0x00FFFFFF;
+    stream_ptr += 4;
+    if (chunk_size != s->size)
+        printf("warning: MOV chunk size != encoded chunk size (%d != %d); using MOV chunk size\n",
+            chunk_size, s->size);
+
+    chunk_size = s->size;
+    total_blocks = (s->avctx->width * s->avctx->height) / (4 * 4);
+
+    /* traverse through the blocks */
+    while (total_blocks) {
+        /* sanity checks */
+        /* make sure stream ptr hasn't gone out of bounds */
+        if (stream_ptr > chunk_size) {
+            printf("SMC decoder just went out of bounds (stream ptr = %d, chunk size = %d)\n",
+                stream_ptr, chunk_size);
+            return;
+        }
+        /* make sure the row pointer hasn't gone wild */
+        if (row_ptr >= image_size) {
+            printf("SMC decoder just went out of bounds (row ptr = %d, height = %d)\n",
+                row_ptr, image_size);
+            return;
+        }
+
+        opcode = s->buf[stream_ptr++];
+        switch (opcode & 0xF0) {
+        /* skip n blocks */
+        case 0x00:
+        case 0x10:
+            n_blocks = GET_BLOCK_COUNT();
+            while (n_blocks--) {
+                block_ptr = row_ptr + pixel_ptr;
+                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
+                        pixels[block_ptr] = prev_pixels[block_ptr];
+                        block_ptr++;
+                    }
+                    block_ptr += row_inc;
+                }
+                ADVANCE_BLOCK();
+            }
+            break;
+
+        /* repeat last block n times */
+        case 0x20:
+        case 0x30:
+            n_blocks = GET_BLOCK_COUNT();
+
+            /* sanity check */
+            if ((row_ptr == 0) && (pixel_ptr == 0)) {
+                printf("encountered repeat block opcode (%02X) but no blocks rendered yet\n",
+                    opcode & 0xF0);
+                break;
+            }
+
+            /* figure out where the previous block started */
+            if (pixel_ptr == 0)
+                prev_block_ptr1 = 
+                    (row_ptr - s->avctx->width * 4) + s->avctx->width - 4;
+            else
+                prev_block_ptr1 = row_ptr + pixel_ptr - 4;
+
+            while (n_blocks--) {
+                block_ptr = row_ptr + pixel_ptr;
+                prev_block_ptr = prev_block_ptr1;
+                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
+                        pixels[block_ptr++] = pixels[prev_block_ptr++];
+                    }
+                    block_ptr += row_inc;
+                    prev_block_ptr += row_inc;
+                }
+                ADVANCE_BLOCK();
+            }
+            break;
+
+        /* repeat previous pair of blocks n times */
+        case 0x40:
+        case 0x50:
+            n_blocks = GET_BLOCK_COUNT();
+            n_blocks *= 2;
+
+            /* sanity check */
+            if ((row_ptr == 0) && (pixel_ptr < 2 * 4)) {
+                printf("encountered repeat block opcode (%02X) but not enough blocks rendered yet\n",
+                    opcode & 0xF0);
+                break;
+            }
+
+            /* figure out where the previous 2 blocks started */
+            if (pixel_ptr == 0)
+                prev_block_ptr1 = (row_ptr - s->avctx->width * 4) + 
+                    s->avctx->width - 4 * 2;
+            else if (pixel_ptr == 4)
+                prev_block_ptr1 = (row_ptr - s->avctx->width * 4) + row_inc;
+            else
+                prev_block_ptr1 = row_ptr + pixel_ptr - 4 * 2;
+
+            if (pixel_ptr == 0)
+                prev_block_ptr2 = (row_ptr - s->avctx->width * 4) + row_inc;
+            else
+                prev_block_ptr2 = row_ptr + pixel_ptr - 4;
+
+            prev_block_flag = 0;
+            while (n_blocks--) {
+                block_ptr = row_ptr + pixel_ptr;
+                if (prev_block_flag)
+                    prev_block_ptr = prev_block_ptr2;
+                else
+                    prev_block_ptr = prev_block_ptr1;
+                prev_block_flag = !prev_block_flag;
+
+                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
+                        pixels[block_ptr++] = pixels[prev_block_ptr++];
+                    }
+                    block_ptr += row_inc;
+                    prev_block_ptr += row_inc;
+                }
+                ADVANCE_BLOCK();
+            }
+            break;
+
+        /* 1-color block encoding */
+        case 0x60:
+        case 0x70:
+            n_blocks = GET_BLOCK_COUNT();
+            pixel = s->buf[stream_ptr++];
+
+            while (n_blocks--) {
+                block_ptr = row_ptr + pixel_ptr;
+                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
+                        pixels[block_ptr++] = pixel;
+                    }
+                    block_ptr += row_inc;
+                }
+                ADVANCE_BLOCK();
+            }
+            break;
+
+        /* 2-color block encoding */
+        case 0x80:
+        case 0x90:
+            n_blocks = (opcode & 0x0F) + 1;
+
+            /* figure out which color pair to use to paint the 2-color block */
+            if ((opcode & 0xF0) == 0x80) {
+                /* fetch the next 2 colors from bytestream and store in next
+                 * available entry in the color pair table */
+                for (i = 0; i < CPAIR; i++) {
+                    pixel = s->buf[stream_ptr++];
+                    color_table_index = CPAIR * color_pair_index + i;
+                    s->color_pairs[color_table_index] = pixel;
+                }
+                /* this is the base index to use for this block */
+                color_table_index = CPAIR * color_pair_index;
+                color_pair_index++;
+                /* wraparound */
+                if (color_pair_index == COLORS_PER_TABLE)
+                    color_pair_index = 0;
+            } else
+                color_table_index = CPAIR * s->buf[stream_ptr++];
+
+            while (n_blocks--) {
+                color_flags = BE_16(&s->buf[stream_ptr]);
+                stream_ptr += 2;
+                flag_mask = 0x8000;
+                block_ptr = row_ptr + pixel_ptr;
+                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
+                        if (color_flags & flag_mask)
+                            pixel = color_table_index + 1;
+                        else
+                            pixel = color_table_index;
+                        flag_mask >>= 1;
+                        pixels[block_ptr++] = s->color_pairs[pixel];
+                    }
+                    block_ptr += row_inc;
+                }
+                ADVANCE_BLOCK();
+            }
+            break;
+
+        /* 4-color block encoding */
+        case 0xA0:
+        case 0xB0:
+            n_blocks = (opcode & 0x0F) + 1;
+
+            /* figure out which color quad to use to paint the 4-color block */
+            if ((opcode & 0xF0) == 0xA0) {
+                /* fetch the next 4 colors from bytestream and store in next
+                 * available entry in the color quad table */
+                for (i = 0; i < CQUAD; i++) {
+                    pixel = s->buf[stream_ptr++];
+                    color_table_index = CQUAD * color_quad_index + i;
+                    s->color_quads[color_table_index] = pixel;
+                }
+                /* this is the base index to use for this block */
+                color_table_index = CQUAD * color_quad_index;
+                color_quad_index++;
+                /* wraparound */
+                if (color_quad_index == COLORS_PER_TABLE)
+                    color_quad_index = 0;
+            } else
+                color_table_index = CQUAD * s->buf[stream_ptr++];
+
+            while (n_blocks--) {
+                color_flags = BE_32(&s->buf[stream_ptr]);
+                stream_ptr += 4;
+                /* flag mask actually acts as a bit shift count here */
+                flag_mask = 30;
+                block_ptr = row_ptr + pixel_ptr;
+                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
+                        pixel = color_table_index + 
+                            ((color_flags >> flag_mask) & 0x03);
+                        flag_mask -= 2;
+                        pixels[block_ptr++] = s->color_quads[pixel];
+                    }
+                    block_ptr += row_inc;
+                }
+                ADVANCE_BLOCK();
+            }
+            break;
+
+        /* 8-color block encoding */
+        case 0xC0:
+        case 0xD0:
+            n_blocks = (opcode & 0x0F) + 1;
+
+            /* figure out which color octet to use to paint the 8-color block */
+            if ((opcode & 0xF0) == 0xC0) {
+                /* fetch the next 8 colors from bytestream and store in next
+                 * available entry in the color octet table */
+                for (i = 0; i < COCTET; i++) {
+                    pixel = s->buf[stream_ptr++];
+                    color_table_index = COCTET * color_octet_index + i;
+                    s->color_octets[color_table_index] = pixel;
+                }
+                /* this is the base index to use for this block */
+                color_table_index = COCTET * color_octet_index;
+                color_octet_index++;
+                /* wraparound */
+                if (color_octet_index == COLORS_PER_TABLE)
+                    color_octet_index = 0;
+            } else
+                color_table_index = COCTET * s->buf[stream_ptr++];
+
+            while (n_blocks--) {
+                /*
+                  For this input of 6 hex bytes:
+                    01 23 45 67 89 AB
+                  Mangle it to this output:
+                    flags_a = xx012456, flags_b = xx89A37B
+                */
+                /* build the color flags */
+                color_flags_a = color_flags_b = 0;
+                color_flags_a =
+                    (s->buf[stream_ptr + 0] << 16) |
+                    ((s->buf[stream_ptr + 1] & 0xF0) << 8) |
+                    ((s->buf[stream_ptr + 2] & 0xF0) << 4) |
+                    ((s->buf[stream_ptr + 2] & 0x0F) << 4) |
+                    ((s->buf[stream_ptr + 3] & 0xF0) >> 4);
+                color_flags_b =
+                    (s->buf[stream_ptr + 4] << 16) |
+                    ((s->buf[stream_ptr + 5] & 0xF0) << 8) |
+                    ((s->buf[stream_ptr + 1] & 0x0F) << 8) |
+                    ((s->buf[stream_ptr + 3] & 0x0F) << 4) |
+                    (s->buf[stream_ptr + 5] & 0x0F);
+                stream_ptr += 6;
+
+                color_flags = color_flags_a;
+                /* flag mask actually acts as a bit shift count here */
+                flag_mask = 21;
+                block_ptr = row_ptr + pixel_ptr;
+                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    /* reload flags at third row (iteration pixel_y == 2) */
+                    if (pixel_y == 2) {
+                        color_flags = color_flags_b;
+                        flag_mask = 21;
+                    }
+                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
+                        pixel = color_table_index + 
+                            ((color_flags >> flag_mask) & 0x07);
+                        flag_mask -= 3;
+                        pixels[block_ptr++] = s->color_octets[pixel];
+                    }
+                    block_ptr += row_inc;
+                }
+                ADVANCE_BLOCK();
+            }
+            break;
+
+        /* 16-color block encoding (every pixel is a different color) */
+        case 0xE0:
+            n_blocks = (opcode & 0x0F) + 1;
+
+            while (n_blocks--) {
+                block_ptr = row_ptr + pixel_ptr;
+                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
+                        pixels[block_ptr++] = s->buf[stream_ptr++];
+                    }
+                    block_ptr += row_inc;
+                }
+                ADVANCE_BLOCK();
+            }
+            break;
+
+        case 0xF0:
+            printf("0xF0 opcode seen in SMC chunk (xine developers would like to know)\n");
+            break;
+        }
+    }
+}
+
+static int smc_decode_init(AVCodecContext *avctx)
+{
+    SmcContext *s = (SmcContext *)avctx->priv_data;
+
+    s->avctx = avctx;
+    avctx->pix_fmt = PIX_FMT_PAL8;
+    avctx->has_b_frames = 0;
+    dsputil_init(&s->dsp, avctx);
+
+    s->frame.data[0] = s->prev_frame.data[0] = NULL;
+
+    return 0;
+}
+
+static int smc_decode_frame(AVCodecContext *avctx,
+                             void *data, int *data_size,
+                             uint8_t *buf, int buf_size)
+{
+    SmcContext *s = (SmcContext *)avctx->priv_data;
+
+    s->buf = buf;
+    s->size = buf_size;
+
+    s->frame.reference = 1;
+    if (avctx->get_buffer(avctx, &s->frame)) {
+        printf ("  smc Video: get_buffer() failed\n");
+        return -1;
+    }
+
+    smc_decode_stream(s);
+
+    if (s->prev_frame.data[0])
+        avctx->release_buffer(avctx, &s->prev_frame);
+
+    /* shuffle frames */
+    s->prev_frame = s->frame;
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = s->frame;
+
+    /* always report that the buffer was completely consumed */
+    return buf_size;
+}
+
+static int smc_decode_end(AVCodecContext *avctx)
+{
+    SmcContext *s = (SmcContext *)avctx->priv_data;
+
+    if (s->prev_frame.data[0])
+        avctx->release_buffer(avctx, &s->prev_frame);
+
+    return 0;
+}
+
+AVCodec smc_decoder = {
+    "smc",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_SMC,
+    sizeof(SmcContext),
+    smc_decode_init,
+    NULL,
+    smc_decode_end,
+    smc_decode_frame,
+    CODEC_CAP_DR1,
+};