[SCM] libav/experimental: added Apple Graphics (SMC) decoder
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 15:38:17 UTC 2013
The following commit has been merged in the experimental branch:
commit 11e29a414359de4cde7c44bdce62cdf2b4363ab2
Author: Mike Melanson <mike at multimedia.cx>
Date: Mon Nov 10 03:14:04 2003 +0000
added Apple Graphics (SMC) decoder
Originally committed as revision 2488 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 6ede870..7fdbd0d 100644
--- a/libavcodec/Makefile
+++ b/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)
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index ac0446a..20a9f36 100644
--- a/libavcodec/allcodecs.c
+++ b/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
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index f7ae388..0a698bd 100644
--- a/libavcodec/avcodec.h
+++ b/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;
diff --git a/libavcodec/smc.c b/libavcodec/smc.c
new file mode 100644
index 0000000..a686488
--- /dev/null
+++ b/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 at 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,
+};
--
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