* Quicktime Graphics (SMC) Video Decoder
* Copyright (C) 2003 the ffmpeg project
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavcodec/smc.c
+ * @file
* QT SMC Video Decoder by Mike Melanson (melanson@pcisys.net)
* For more information about the SMC format, visit:
* http://www.pcisys.net/~melanson/codecs/
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
+#include "bytestream.h"
#define CPAIR 2
#define CQUAD 4
AVCodecContext *avctx;
AVFrame frame;
- const unsigned char *buf;
- int size;
+ GetByteContext gb;
/* 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];
+ uint32_t pal[256];
} SmcContext;
#define GET_BLOCK_COUNT() \
- (opcode & 0x10) ? (1 + s->buf[stream_ptr++]) : 1 + (opcode & 0x0F);
+ (opcode & 0x10) ? (1 + bytestream2_get_byte(&s->gb)) : 1 + (opcode & 0x0F);
#define ADVANCE_BLOCK() \
{ \
int height = s->avctx->height;
int stride = s->frame.linesize[0];
int i;
- int stream_ptr = 0;
int chunk_size;
+ int buf_size = (int) (s->gb.buffer_end - s->gb.buffer_start);
unsigned char opcode;
int n_blocks;
unsigned int color_flags;
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;
- }
+ memcpy(s->frame.data[1], s->pal, AVPALETTE_SIZE);
- chunk_size = AV_RB32(&s->buf[stream_ptr]) & 0x00FFFFFF;
- stream_ptr += 4;
- if (chunk_size != s->size)
+ bytestream2_skip(&s->gb, 1);
+ chunk_size = bytestream2_get_be24(&s->gb);
+ if (chunk_size != buf_size)
av_log(s->avctx, AV_LOG_INFO, "warning: MOV chunk size != encoded chunk size (%d != %d); using MOV chunk size\n",
- chunk_size, s->size);
+ chunk_size, buf_size);
- chunk_size = s->size;
+ chunk_size = buf_size;
total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 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) {
- av_log(s->avctx, AV_LOG_INFO, "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) {
av_log(s->avctx, AV_LOG_INFO, "SMC decoder just went out of bounds (row ptr = %d, height = %d)\n",
return;
}
- opcode = s->buf[stream_ptr++];
+ opcode = bytestream2_get_byte(&s->gb);
switch (opcode & 0xF0) {
/* skip n blocks */
case 0x00:
if ((row_ptr == 0) && (pixel_ptr == 0)) {
av_log(s->avctx, AV_LOG_INFO, "encountered repeat block opcode (%02X) but no blocks rendered yet\n",
opcode & 0xF0);
- break;
+ return;
}
/* figure out where the previous block started */
if ((row_ptr == 0) && (pixel_ptr < 2 * 4)) {
av_log(s->avctx, AV_LOG_INFO, "encountered repeat block opcode (%02X) but not enough blocks rendered yet\n",
opcode & 0xF0);
- break;
+ return;
}
/* figure out where the previous 2 blocks started */
case 0x60:
case 0x70:
n_blocks = GET_BLOCK_COUNT();
- pixel = s->buf[stream_ptr++];
+ pixel = bytestream2_get_byte(&s->gb);
while (n_blocks--) {
block_ptr = row_ptr + pixel_ptr;
/* 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++];
+ pixel = bytestream2_get_byte(&s->gb);
color_table_index = CPAIR * color_pair_index + i;
s->color_pairs[color_table_index] = pixel;
}
if (color_pair_index == COLORS_PER_TABLE)
color_pair_index = 0;
} else
- color_table_index = CPAIR * s->buf[stream_ptr++];
+ color_table_index = CPAIR * bytestream2_get_byte(&s->gb);
while (n_blocks--) {
- color_flags = AV_RB16(&s->buf[stream_ptr]);
- stream_ptr += 2;
+ color_flags = bytestream2_get_be16(&s->gb);
flag_mask = 0x8000;
block_ptr = row_ptr + pixel_ptr;
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
/* 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++];
+ pixel = bytestream2_get_byte(&s->gb);
color_table_index = CQUAD * color_quad_index + i;
s->color_quads[color_table_index] = pixel;
}
if (color_quad_index == COLORS_PER_TABLE)
color_quad_index = 0;
} else
- color_table_index = CQUAD * s->buf[stream_ptr++];
+ color_table_index = CQUAD * bytestream2_get_byte(&s->gb);
while (n_blocks--) {
- color_flags = AV_RB32(&s->buf[stream_ptr]);
- stream_ptr += 4;
+ color_flags = bytestream2_get_be32(&s->gb);
/* flag mask actually acts as a bit shift count here */
flag_mask = 30;
block_ptr = row_ptr + pixel_ptr;
/* 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++];
+ pixel = bytestream2_get_byte(&s->gb);
color_table_index = COCTET * color_octet_index + i;
s->color_octets[color_table_index] = pixel;
}
if (color_octet_index == COLORS_PER_TABLE)
color_octet_index = 0;
} else
- color_table_index = COCTET * s->buf[stream_ptr++];
+ color_table_index = COCTET * bytestream2_get_byte(&s->gb);
while (n_blocks--) {
/*
flags_a = xx012456, flags_b = xx89A37B
*/
/* build the color flags */
- color_flags_a =
- ((AV_RB16(s->buf + stream_ptr ) & 0xFFF0) << 8) |
- (AV_RB16(s->buf + stream_ptr + 2) >> 4);
- color_flags_b =
- ((AV_RB16(s->buf + stream_ptr + 4) & 0xFFF0) << 8) |
- ((s->buf[stream_ptr + 1] & 0x0F) << 8) |
- ((s->buf[stream_ptr + 3] & 0x0F) << 4) |
- (s->buf[stream_ptr + 5] & 0x0F);
- stream_ptr += 6;
+ int val1 = bytestream2_get_be16(&s->gb);
+ int val2 = bytestream2_get_be16(&s->gb);
+ int val3 = bytestream2_get_be16(&s->gb);
+ color_flags_a = ((val1 & 0xFFF0) << 8) | (val2 >> 4);
+ color_flags_b = ((val3 & 0xFFF0) << 8) |
+ ((val1 & 0x0F) << 8) | ((val2 & 0x0F) << 4) | (val3 & 0x0F);
color_flags = color_flags_a;
/* flag mask actually acts as a bit shift count here */
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++];
+ pixels[block_ptr++] = bytestream2_get_byte(&s->gb);
}
block_ptr += row_inc;
}
break;
case 0xF0:
- av_log(s->avctx, AV_LOG_INFO, "0xF0 opcode seen in SMC chunk (contact the developers)\n");
+ av_log_missing_feature(s->avctx, "0xF0 opcode", 1);
break;
}
}
+
+ return;
}
static av_cold int smc_decode_init(AVCodecContext *avctx)
SmcContext *s = avctx->priv_data;
s->avctx = avctx;
- avctx->pix_fmt = PIX_FMT_PAL8;
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
s->frame.data[0] = NULL;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
SmcContext *s = avctx->priv_data;
+ const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
- s->buf = buf;
- s->size = buf_size;
+ bytestream2_init(&s->gb, buf, buf_size);
s->frame.reference = 1;
s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
return -1;
}
+ if (pal) {
+ s->frame.palette_has_changed = 1;
+ memcpy(s->pal, pal, AVPALETTE_SIZE);
+ }
+
smc_decode_stream(s);
*data_size = sizeof(AVFrame);
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,
- .long_name = NULL_IF_CONFIG_SMALL("QuickTime Graphics (SMC)"),
+AVCodec ff_smc_decoder = {
+ .name = "smc",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_SMC,
+ .priv_data_size = sizeof(SmcContext),
+ .init = smc_decode_init,
+ .close = smc_decode_end,
+ .decode = smc_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("QuickTime Graphics (SMC)"),
};
projects / ffmpeg / blobdiff