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FFmpeg/libavcodec/qdrw.c
Vittorio Giovara def97856de lavc: AV-prefix all codec capabilities 
Express bitfields more simply.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
2015-07-27 15:24:58 +01:00

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/*
* QuickDraw (qdrw) codec
* Copyright (c) 2004 Konstantin Shishkov
* Copyright (c) 2015 Vittorio Giovara
*
* This file is part of Libav.
*
* 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.
*
* 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Apple QuickDraw codec.
* https://developer.apple.com/legacy/library/documentation/mac/QuickDraw/QuickDraw-461.html
*/
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
enum QuickdrawOpcodes {
PACKBITSRECT = 0x0098,
PACKBITSRGN,
DIRECTBITSRECT,
DIRECTBITSRGN,
EOP = 0x00FF,
};
static int parse_palette(AVCodecContext *avctx, GetByteContext *gbc,
uint32_t *pal, int colors)
{
int i;
for (i = 0; i <= colors; i++) {
uint8_t r, g, b;
unsigned int idx = bytestream2_get_be16(gbc); /* color index */
if (idx > 255) {
av_log(avctx, AV_LOG_WARNING,
"Palette index out of range: %u\n", idx);
bytestream2_skip(gbc, 6);
continue;
}
r = bytestream2_get_byte(gbc);
bytestream2_skip(gbc, 1);
g = bytestream2_get_byte(gbc);
bytestream2_skip(gbc, 1);
b = bytestream2_get_byte(gbc);
bytestream2_skip(gbc, 1);
pal[idx] = (0xFFU << 24) | (r << 16) | (g << 8) | b;
}
return 0;
}
static int decode_rle(AVCodecContext *avctx, AVFrame *p, GetByteContext *gbc,
int step)
{
int i, j;
int offset = avctx->width * step;
uint8_t *outdata = p->data[0];
for (i = 0; i < avctx->height; i++) {
int size, left, code, pix;
uint8_t *out = outdata;
int pos = 0;
/* size of packed line */
size = left = bytestream2_get_be16(gbc);
if (bytestream2_get_bytes_left(gbc) < size)
return AVERROR_INVALIDDATA;
/* decode line */
while (left > 0) {
code = bytestream2_get_byte(gbc);
if (code & 0x80 ) { /* run */
pix = bytestream2_get_byte(gbc);
for (j = 0; j < 257 - code; j++) {
out[pos] = pix;
pos += step;
if (pos >= offset) {
pos -= offset;
pos++;
}
}
left -= 2;
} else { /* copy */
for (j = 0; j < code + 1; j++) {
out[pos] = bytestream2_get_byte(gbc);
pos += step;
if (pos >= offset) {
pos -= offset;
pos++;
}
}
left -= 2 + code;
}
}
outdata += p->linesize[0];
}
return 0;
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
AVFrame * const p = data;
GetByteContext gbc;
int colors;
int w, h, ret;
bytestream2_init(&gbc, avpkt->data, avpkt->size);
/* PICT images start with a 512 bytes empty header */
if (bytestream2_peek_be32(&gbc) == 0)
bytestream2_skip(&gbc, 512);
/* smallest PICT header */
if (bytestream2_get_bytes_left(&gbc) < 40) {
av_log(avctx, AV_LOG_ERROR, "Frame is too small %d\n",
bytestream2_get_bytes_left(&gbc));
return AVERROR_INVALIDDATA;
}
bytestream2_skip(&gbc, 6);
h = bytestream2_get_be16(&gbc);
w = bytestream2_get_be16(&gbc);
ret = ff_set_dimensions(avctx, w, h);
if (ret < 0)
return ret;
/* version 1 is identified by 0x1101
* it uses byte-aligned opcodes rather than word-aligned */
if (bytestream2_get_be32(&gbc) != 0x001102FF) {
avpriv_request_sample(avctx, "QuickDraw version 1");
return AVERROR_PATCHWELCOME;
}
bytestream2_skip(&gbc, 26);
while (bytestream2_get_bytes_left(&gbc) >= 4) {
int bppcnt, bpp;
int rowbytes, pack_type;
int opcode = bytestream2_get_be16(&gbc);
switch(opcode) {
case PACKBITSRECT:
case PACKBITSRGN:
av_log(avctx, AV_LOG_DEBUG, "Parsing Packbit opcode\n");
bytestream2_skip(&gbc, 30);
bppcnt = bytestream2_get_be16(&gbc); /* cmpCount */
bpp = bytestream2_get_be16(&gbc); /* cmpSize */
av_log(avctx, AV_LOG_DEBUG, "bppcount %d bpp %d\n", bppcnt, bpp);
if (bppcnt == 1 && bpp == 8) {
avctx->pix_fmt = AV_PIX_FMT_PAL8;
} else {
av_log(avctx, AV_LOG_ERROR,
"Invalid pixel format (bppcnt %d bpp %d) in Packbit\n",
bppcnt, bpp);
return AVERROR_INVALIDDATA;
}
/* jump to palette */
bytestream2_skip(&gbc, 18);
colors = bytestream2_get_be16(&gbc);
if (colors < 0 || colors > 256) {
av_log(avctx, AV_LOG_ERROR,
"Error color count - %i(0x%X)\n", colors, colors);
return AVERROR_INVALIDDATA;
}
if (bytestream2_get_bytes_left(&gbc) < (colors + 1) * 8) {
av_log(avctx, AV_LOG_ERROR, "Palette is too small %d\n",
bytestream2_get_bytes_left(&gbc));
return AVERROR_INVALIDDATA;
}
if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
parse_palette(avctx, &gbc, (uint32_t *)p->data[1], colors);
p->palette_has_changed = 1;
/* jump to image data */
bytestream2_skip(&gbc, 18);
if (opcode == PACKBITSRGN) {
bytestream2_skip(&gbc, 2 + 8); /* size + rect */
avpriv_report_missing_feature(avctx, "Packbit mask region");
}
ret = decode_rle(avctx, p, &gbc, bppcnt);
if (ret < 0)
return ret;
*got_frame = 1;
break;
case DIRECTBITSRECT:
case DIRECTBITSRGN:
av_log(avctx, AV_LOG_DEBUG, "Parsing Directbit opcode\n");
bytestream2_skip(&gbc, 4);
rowbytes = bytestream2_get_be16(&gbc) & 0x3FFF;
if (rowbytes <= 250) {
avpriv_report_missing_feature(avctx, "Short rowbytes");
return AVERROR_PATCHWELCOME;
}
bytestream2_skip(&gbc, 10);
pack_type = bytestream2_get_be16(&gbc);
bytestream2_skip(&gbc, 16);
bppcnt = bytestream2_get_be16(&gbc); /* cmpCount */
bpp = bytestream2_get_be16(&gbc); /* cmpSize */
av_log(avctx, AV_LOG_DEBUG, "bppcount %d bpp %d\n", bppcnt, bpp);
if (bppcnt == 3 && bpp == 8) {
avctx->pix_fmt = AV_PIX_FMT_RGB24;
} else if (bppcnt == 4 && bpp == 8) {
avctx->pix_fmt = AV_PIX_FMT_ARGB;
} else {
av_log(avctx, AV_LOG_ERROR,
"Invalid pixel format (bppcnt %d bpp %d) in Directbit\n",
bppcnt, bpp);
return AVERROR_INVALIDDATA;
}
/* set packing when default is selected */
if (pack_type == 0)
pack_type = bppcnt;
if (pack_type != 3 && pack_type != 4) {
avpriv_request_sample(avctx, "Pack type %d", pack_type);
return AVERROR_PATCHWELCOME;
}
if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
/* jump to data */
bytestream2_skip(&gbc, 30);
if (opcode == DIRECTBITSRGN) {
bytestream2_skip(&gbc, 2 + 8); /* size + rect */
avpriv_report_missing_feature(avctx, "DirectBit mask region");
}
ret = decode_rle(avctx, p, &gbc, bppcnt);
if (ret < 0)
return ret;
*got_frame = 1;
break;
default:
av_log(avctx, AV_LOG_TRACE, "Unknown 0x%04X opcode\n", opcode);
break;
}
/* exit the loop when a known pixel block has been found */
if (*got_frame) {
int eop, trail;
/* re-align to a word */
bytestream2_skip(&gbc, bytestream2_get_bytes_left(&gbc) % 2);
eop = bytestream2_get_be16(&gbc);
trail = bytestream2_get_bytes_left(&gbc);
if (eop != EOP)
av_log(avctx, AV_LOG_WARNING,
"Missing end of picture opcode (found 0x%04X)\n", eop);
if (trail)
av_log(avctx, AV_LOG_WARNING, "Got %d trailing bytes\n", trail);
break;
}
}
if (*got_frame) {
p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1;
return avpkt->size;
} else {
av_log(avctx, AV_LOG_ERROR, "Frame contained no usable data\n");
return AVERROR_INVALIDDATA;
}
}
AVCodec ff_qdraw_decoder = {
.name = "qdraw",
.long_name = NULL_IF_CONFIG_SMALL("Apple QuickDraw"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_QDRAW,
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
};
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