/*
- * BMP image format
+ * BMP image format decoder
* Copyright (c) 2005 Mans Rullgard
*
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library 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 this library; 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
*/
-#include "avcodec.h"
-#include "bitstream.h"
-#include "bswap.h"
-
-typedef struct BMPContext {
- AVFrame picture;
-} BMPContext;
-
-#define BMP_RGB 0
-#define BMP_RLE8 1
-#define BMP_RLE4 2
-#define BMP_BITFIELDS 3
-
-#define read16(bits) bswap_16(get_bits(bits, 16))
-#define read32(bits) bswap_32(get_bits_long(bits, 32))
-
-static int bmp_decode_init(AVCodecContext *avctx){
- BMPContext *s = avctx->priv_data;
+#include <inttypes.h>
- avcodec_get_frame_defaults((AVFrame*)&s->picture);
- avctx->coded_frame = (AVFrame*)&s->picture;
-
- return 0;
-}
+#include "avcodec.h"
+#include "bytestream.h"
+#include "bmp.h"
+#include "internal.h"
+#include "msrledec.h"
static int bmp_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ void *data, int *got_frame,
+ AVPacket *avpkt)
{
- BMPContext *s = avctx->priv_data;
- AVFrame *picture = data;
- AVFrame *p = &s->picture;
- GetBitContext bits;
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ AVFrame *p = data;
unsigned int fsize, hsize;
int width, height;
unsigned int depth;
- unsigned int comp;
+ BiCompression comp;
unsigned int ihsize;
- int i, j, n, linesize;
+ int i, j, n, linesize, ret;
uint32_t rgb[3];
uint8_t *ptr;
int dsize;
+ const uint8_t *buf0 = buf;
+ GetByteContext gb;
- if(buf_size < 14){
+ if (buf_size < 14) {
av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
- return -1;
+ return AVERROR_INVALIDDATA;
}
- init_get_bits(&bits, buf, buf_size);
-
- if(get_bits(&bits, 16) != 0x424d){ /* 'BM' */
+ if (bytestream_get_byte(&buf) != 'B' ||
+ bytestream_get_byte(&buf) != 'M') {
av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
- fsize = read32(&bits);
- if(buf_size < fsize){
- av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
+ 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);
- return -1;
+ fsize = buf_size;
}
- skip_bits(&bits, 16); /* reserved1 */
- skip_bits(&bits, 16); /* reserved2 */
+ buf += 2; /* reserved1 */
+ buf += 2; /* reserved2 */
- hsize = read32(&bits); /* header size */
- if(fsize <= hsize){
- av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
- fsize, hsize);
- return -1;
+ hsize = bytestream_get_le32(&buf); /* header size */
+ ihsize = bytestream_get_le32(&buf); /* more header size */
+ if (ihsize + 14 > hsize) {
+ av_log(avctx, AV_LOG_ERROR, "invalid header size %u\n", hsize);
+ return AVERROR_INVALIDDATA;
}
- ihsize = read32(&bits); /* more header size */
- if(ihsize + 14 > hsize){
- av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
- return -1;
+ /* 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;
}
- width = read32(&bits);
- height = read32(&bits);
+ switch (ihsize) {
+ case 40: // 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:
+ av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome\n");
+ return AVERROR_PATCHWELCOME;
+ }
- if(read16(&bits) != 1){ /* planes */
+ /* planes */
+ if (bytestream_get_le16(&buf) != 1) {
av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
- depth = read16(&bits);
+ depth = bytestream_get_le16(&buf);
- if(ihsize > 16)
- comp = read32(&bits);
+ if (ihsize == 40)
+ comp = bytestream_get_le32(&buf);
else
comp = BMP_RGB;
- if(comp != BMP_RGB && comp != BMP_BITFIELDS){
+ 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 -1;
+ return AVERROR_INVALIDDATA;
}
- if(comp == BMP_BITFIELDS){
- skip_bits(&bits, 20 * 8);
- rgb[0] = read32(&bits);
- rgb[1] = read32(&bits);
- rgb[2] = read32(&bits);
+ if (comp == BMP_BITFIELDS) {
+ buf += 20;
+ rgb[0] = bytestream_get_le32(&buf);
+ rgb[1] = bytestream_get_le32(&buf);
+ rgb[2] = bytestream_get_le32(&buf);
}
- avctx->codec_id = CODEC_ID_BMP;
- avctx->width = width;
- avctx->height = height > 0? height: -height;
+ avctx->width = width;
+ avctx->height = height > 0 ? height : -height;
- avctx->pix_fmt = PIX_FMT_NONE;
+ avctx->pix_fmt = AV_PIX_FMT_NONE;
- switch(depth){
+ switch (depth) {
case 32:
- if(comp == BMP_BITFIELDS){
+ if (comp == BMP_BITFIELDS) {
rgb[0] = (rgb[0] >> 15) & 3;
rgb[1] = (rgb[1] >> 15) & 3;
rgb[2] = (rgb[2] >> 15) & 3;
- if(rgb[0] + rgb[1] + rgb[2] != 3 ||
- rgb[0] == rgb[1] || rgb[0] == rgb[2] || rgb[1] == rgb[2]){
+ if (rgb[0] + rgb[1] + rgb[2] != 3 ||
+ rgb[0] == rgb[1] || rgb[0] == rgb[2] || rgb[1] == rgb[2]) {
break;
}
} else {
rgb[2] = 0;
}
- avctx->pix_fmt = PIX_FMT_BGR24;
+ avctx->pix_fmt = AV_PIX_FMT_BGR24;
break;
case 24:
- avctx->pix_fmt = PIX_FMT_BGR24;
+ avctx->pix_fmt = AV_PIX_FMT_BGR24;
break;
case 16:
- if(comp == BMP_RGB)
- avctx->pix_fmt = PIX_FMT_RGB555;
+ 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 %d not supported\n", depth);
- return -1;
+ av_log(avctx, AV_LOG_ERROR, "depth %u not supported\n", depth);
+ return AVERROR_INVALIDDATA;
}
- if(avctx->pix_fmt == PIX_FMT_NONE){
+ if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
- p->reference = 0;
- if(avctx->get_buffer(avctx, p) < 0){
+ if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return -1;
+ return ret;
}
- p->pict_type = FF_I_TYPE;
+ p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1;
- buf += hsize;
+ buf = buf0 + hsize;
dsize = buf_size - hsize;
- n = avctx->width * (depth / 8);
+ /* Line size in file multiple of 4 */
+ n = ((avctx->width * depth) / 8 + 3) & ~3;
- if(n * avctx->height > dsize){
+ if (n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8) {
av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
dsize, n * avctx->height);
- return -1;
+ return AVERROR_INVALIDDATA;
}
- if(height > 0){
- ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
+ // 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];
+ ptr = p->data[0];
linesize = p->linesize[0];
}
- switch(depth){
- case 24:
- for(i = 0; i < avctx->height; i++){
- memcpy(ptr, buf, n);
- buf += n;
- ptr += linesize;
+ 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;
+ }
}
- break;
- case 16:
- for(i = 0; i < avctx->height; i++){
- uint16_t *src = (uint16_t *) buf;
- uint16_t *dst = (uint16_t *) ptr;
-
- for(j = 0; j < avctx->width; j++)
- *dst++ = le2me_16(*src++);
-
- buf += n;
- ptr += linesize;
+ buf = buf0 + 14 + ihsize; //palette location
+ // OS/2 bitmap, 3 bytes per palette entry
+ if ((hsize-ihsize-14) < (colors << 2)) {
+ for (i = 0; i < colors; i++)
+ ((uint32_t*)p->data[1])[i] = bytestream_get_le24(&buf);
+ } else {
+ for (i = 0; i < colors; i++)
+ ((uint32_t*)p->data[1])[i] = bytestream_get_le32(&buf);
}
- break;
- case 32:
- for(i = 0; i < avctx->height; i++){
- uint8_t *src = buf;
- uint8_t *dst = ptr;
-
- for(j = 0; j < avctx->width; j++){
- dst[0] = src[rgb[2]];
- dst[1] = src[rgb[1]];
- dst[2] = src[rgb[0]];
- dst += 3;
- src += 4;
+ buf = buf0 + hsize;
+ }
+ if (comp == BMP_RLE4 || comp == BMP_RLE8) {
+ if (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, (AVPicture*)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 < n; 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;
+ }
+ buf += n;
+ ptr += linesize;
+ }
+ break;
+ case 8:
+ case 24:
+ 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;
- buf += n;
- ptr += linesize;
+ for (j = 0; j < avctx->width; j++)
+ *dst++ = av_le2ne16(*src++);
+
+ buf += n;
+ ptr += linesize;
+ }
+ break;
+ case 32:
+ for (i = 0; i < avctx->height; i++) {
+ const uint8_t *src = buf;
+ uint8_t *dst = ptr;
+
+ for (j = 0; j < avctx->width; j++) {
+ dst[0] = src[rgb[2]];
+ dst[1] = src[rgb[1]];
+ dst[2] = src[rgb[0]];
+ dst += 3;
+ src += 4;
+ }
+
+ buf += n;
+ ptr += linesize;
+ }
+ break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
+ return AVERROR_INVALIDDATA;
}
- break;
- default:
- av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
- return -1;
}
- *picture = s->picture;
- *data_size = sizeof(AVPicture);
+ *got_frame = 1;
return buf_size;
}
-AVCodec bmp_decoder = {
- "bmp",
- CODEC_TYPE_VIDEO,
- CODEC_ID_BMP,
- sizeof(BMPContext),
- bmp_decode_init,
- NULL,
- NULL,
- bmp_decode_frame
+AVCodec ff_bmp_decoder = {
+ .name = "bmp",
+ .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_BMP,
+ .decode = bmp_decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
};
projects / ffmpeg / blobdiff