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FFmpeg/libavcodec/bmp.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

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/*
* BMP image format decoder
* Copyright (c) 2005 Mans Rullgard
*
* This file is part of FFmpeg.
*
* FFmpeg 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,
* 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <inttypes.h>
#include "avcodec.h"
#include "bytestream.h"
#include "bmp.h"
#include "codec_internal.h"
#include "internal.h"
#include "msrledec.h"
static int bmp_decode_frame(AVCodecContext *avctx, AVFrame *p,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
unsigned int fsize, hsize;
int width, height;
unsigned int depth;
BiCompression comp;
unsigned int ihsize;
int i, j, n, linesize, ret;
uint32_t rgb[3] = {0};
uint32_t alpha = 0;
uint8_t *ptr;
int dsize;
const uint8_t *buf0 = buf;
GetByteContext gb;
if (buf_size < 14) {
av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
return AVERROR_INVALIDDATA;
}
if (bytestream_get_byte(&buf) != 'B' ||
bytestream_get_byte(&buf) != 'M') {
av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
return AVERROR_INVALIDDATA;
}
fsize = bytestream_get_le32(&buf);
if (buf_size < fsize) {
av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %u), trying to decode anyway\n",
buf_size, fsize);
fsize = buf_size;
}
buf += 2; /* reserved1 */
buf += 2; /* reserved2 */
hsize = bytestream_get_le32(&buf); /* header size */
ihsize = bytestream_get_le32(&buf); /* more header size */
if (ihsize + 14LL > hsize) {
av_log(avctx, AV_LOG_ERROR, "invalid header size %u\n", hsize);
return AVERROR_INVALIDDATA;
}
/* sometimes file size is set to some headers size, set a real size in that case */
if (fsize == 14 || fsize == ihsize + 14)
fsize = buf_size - 2;
if (fsize <= hsize) {
av_log(avctx, AV_LOG_ERROR,
"Declared file size is less than header size (%u < %u)\n",
fsize, hsize);
return AVERROR_INVALIDDATA;
}
switch (ihsize) {
case 40: // windib
case 56: // windib v3
case 64: // OS/2 v2
case 108: // windib v4
case 124: // windib v5
width = bytestream_get_le32(&buf);
height = bytestream_get_le32(&buf);
break;
case 12: // OS/2 v1
width = bytestream_get_le16(&buf);
height = bytestream_get_le16(&buf);
break;
default:
avpriv_report_missing_feature(avctx, "Information header size %u",
ihsize);
return AVERROR_PATCHWELCOME;
}
/* planes */
if (bytestream_get_le16(&buf) != 1) {
av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
return AVERROR_INVALIDDATA;
}
depth = bytestream_get_le16(&buf);
if (ihsize >= 40)
comp = bytestream_get_le32(&buf);
else
comp = BMP_RGB;
if (comp != BMP_RGB && comp != BMP_BITFIELDS && comp != BMP_RLE4 &&
comp != BMP_RLE8) {
av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
return AVERROR_INVALIDDATA;
}
if (comp == BMP_BITFIELDS) {
buf += 20;
rgb[0] = bytestream_get_le32(&buf);
rgb[1] = bytestream_get_le32(&buf);
rgb[2] = bytestream_get_le32(&buf);
if (ihsize > 40)
alpha = bytestream_get_le32(&buf);
}
ret = ff_set_dimensions(avctx, width, height > 0 ? height : -(unsigned)height);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to set dimensions %d %d\n", width, height);
return AVERROR_INVALIDDATA;
}
avctx->pix_fmt = AV_PIX_FMT_NONE;
switch (depth) {
case 32:
if (comp == BMP_BITFIELDS) {
if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00)
avctx->pix_fmt = alpha ? AV_PIX_FMT_ABGR : AV_PIX_FMT_0BGR;
else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF)
avctx->pix_fmt = alpha ? AV_PIX_FMT_BGRA : AV_PIX_FMT_BGR0;
else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000)
avctx->pix_fmt = alpha ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000)
avctx->pix_fmt = alpha ? AV_PIX_FMT_RGBA : AV_PIX_FMT_RGB0;
else {
av_log(avctx, AV_LOG_ERROR, "Unknown bitfields "
"%0"PRIX32" %0"PRIX32" %0"PRIX32"\n", rgb[0], rgb[1], rgb[2]);
return AVERROR(EINVAL);
}
} else {
avctx->pix_fmt = AV_PIX_FMT_BGRA;
}
break;
case 24:
avctx->pix_fmt = AV_PIX_FMT_BGR24;
break;
case 16:
if (comp == BMP_RGB)
avctx->pix_fmt = AV_PIX_FMT_RGB555;
else if (comp == BMP_BITFIELDS) {
if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F)
avctx->pix_fmt = AV_PIX_FMT_RGB565;
else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F)
avctx->pix_fmt = AV_PIX_FMT_RGB555;
else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F)
avctx->pix_fmt = AV_PIX_FMT_RGB444;
else {
av_log(avctx, AV_LOG_ERROR,
"Unknown bitfields %0"PRIX32" %0"PRIX32" %0"PRIX32"\n",
rgb[0], rgb[1], rgb[2]);
return AVERROR(EINVAL);
}
}
break;
case 8:
if (hsize - ihsize - 14 > 0)
avctx->pix_fmt = AV_PIX_FMT_PAL8;
else
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
break;
case 1:
case 4:
if (hsize - ihsize - 14 > 0) {
avctx->pix_fmt = AV_PIX_FMT_PAL8;
} else {
av_log(avctx, AV_LOG_ERROR, "Unknown palette for %u-colour BMP\n",
1 << depth);
return AVERROR_INVALIDDATA;
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "depth %u not supported\n", depth);
return AVERROR_INVALIDDATA;
}
if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
return AVERROR_INVALIDDATA;
}
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
return ret;
p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1;
buf = buf0 + hsize;
dsize = buf_size - hsize;
/* Line size in file multiple of 4 */
n = ((avctx->width * depth + 31) / 8) & ~3;
if (n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8) {
n = (avctx->width * depth + 7) / 8;
if (n * avctx->height > dsize) {
av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
dsize, n * avctx->height);
return AVERROR_INVALIDDATA;
}
av_log(avctx, AV_LOG_ERROR, "data size too small, assuming missing line alignment\n");
}
// RLE may skip decoding some picture areas, so blank picture before decoding
if (comp == BMP_RLE4 || comp == BMP_RLE8)
memset(p->data[0], 0, avctx->height * p->linesize[0]);
if (height > 0) {
ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
linesize = -p->linesize[0];
} else {
ptr = p->data[0];
linesize = p->linesize[0];
}
if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
int colors = 1 << depth;
memset(p->data[1], 0, 1024);
if (ihsize >= 36) {
int t;
buf = buf0 + 46;
t = bytestream_get_le32(&buf);
if (t < 0 || t > (1 << depth)) {
av_log(avctx, AV_LOG_ERROR,
"Incorrect number of colors - %X for bitdepth %u\n",
t, depth);
} else if (t) {
colors = t;
}
} else {
colors = FFMIN(256, (hsize-ihsize-14) / 3);
}
buf = buf0 + 14 + ihsize; //palette location
// OS/2 bitmap, 3 bytes per palette entry
if ((hsize-ihsize-14) < (colors << 2)) {
if ((hsize-ihsize-14) < colors * 3) {
av_log(avctx, AV_LOG_ERROR, "palette doesn't fit in packet\n");
return AVERROR_INVALIDDATA;
}
for (i = 0; i < colors; i++)
((uint32_t*)p->data[1])[i] = (0xFFU<<24) | bytestream_get_le24(&buf);
} else {
for (i = 0; i < colors; i++)
((uint32_t*)p->data[1])[i] = 0xFFU << 24 | bytestream_get_le32(&buf);
}
buf = buf0 + hsize;
}
if (comp == BMP_RLE4 || comp == BMP_RLE8) {
if (comp == BMP_RLE8 && height < 0) {
p->data[0] += p->linesize[0] * (avctx->height - 1);
p->linesize[0] = -p->linesize[0];
}
bytestream2_init(&gb, buf, dsize);
ff_msrle_decode(avctx, p, depth, &gb);
if (height < 0) {
p->data[0] += p->linesize[0] * (avctx->height - 1);
p->linesize[0] = -p->linesize[0];
}
} else {
switch (depth) {
case 1:
for (i = 0; i < avctx->height; i++) {
int j;
for (j = 0; j < avctx->width >> 3; j++) {
ptr[j*8+0] = buf[j] >> 7;
ptr[j*8+1] = (buf[j] >> 6) & 1;
ptr[j*8+2] = (buf[j] >> 5) & 1;
ptr[j*8+3] = (buf[j] >> 4) & 1;
ptr[j*8+4] = (buf[j] >> 3) & 1;
ptr[j*8+5] = (buf[j] >> 2) & 1;
ptr[j*8+6] = (buf[j] >> 1) & 1;
ptr[j*8+7] = buf[j] & 1;
}
for (j = 0; j < (avctx->width & 7); j++) {
ptr[avctx->width - (avctx->width & 7) + j] = buf[avctx->width >> 3] >> (7 - j) & 1;
}
buf += n;
ptr += linesize;
}
break;
case 8:
case 24:
case 32:
for (i = 0; i < avctx->height; i++) {
memcpy(ptr, buf, n);
buf += n;
ptr += linesize;
}
break;
case 4:
for (i = 0; i < avctx->height; i++) {
int j;
for (j = 0; j < n; j++) {
ptr[j*2+0] = (buf[j] >> 4) & 0xF;
ptr[j*2+1] = buf[j] & 0xF;
}
buf += n;
ptr += linesize;
}
break;
case 16:
for (i = 0; i < avctx->height; i++) {
const uint16_t *src = (const uint16_t *) buf;
uint16_t *dst = (uint16_t *) ptr;
for (j = 0; j < avctx->width; j++)
*dst++ = av_le2ne16(*src++);
buf += n;
ptr += linesize;
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
return AVERROR_INVALIDDATA;
}
}
if (avctx->pix_fmt == AV_PIX_FMT_BGRA) {
for (i = 0; i < avctx->height; i++) {
int j;
uint8_t *ptr = p->data[0] + p->linesize[0]*i + 3;
for (j = 0; j < avctx->width; j++) {
if (ptr[4*j])
break;
}
if (j < avctx->width)
break;
}
if (i == avctx->height)
avctx->pix_fmt = p->format = AV_PIX_FMT_BGR0;
}
*got_frame = 1;
return buf_size;
}
const FFCodec ff_bmp_decoder = {
.p.name = "bmp",
.p.long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_BMP,
.p.capabilities = AV_CODEC_CAP_DR1,
FF_CODEC_DECODE_CB(bmp_decode_frame),
};
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