/*
- * BMP image format
+ * BMP image format decoder
* Copyright (c) 2005 Mans Rullgard
*
- * 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
*/
#include "avcodec.h"
-#include "bitstream.h"
-#include "bswap.h"
+#include "bytestream.h"
+#include "bmp.h"
+#include "msrledec.h"
-typedef struct BMPContext {
- AVFrame picture;
-} BMPContext;
-
-typedef enum {
- BMP_RGB =0,
- BMP_RLE8 =1,
- BMP_RLE4 =2,
- BMP_BITFIELDS =3,
-} BiCompression;
-
-#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){
+static av_cold int bmp_decode_init(AVCodecContext *avctx){
BMPContext *s = avctx->priv_data;
avcodec_get_frame_defaults((AVFrame*)&s->picture);
static int bmp_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
BMPContext *s = avctx->priv_data;
AVFrame *picture = data;
AVFrame *p = &s->picture;
- GetBitContext bits;
unsigned int fsize, hsize;
int width, height;
unsigned int depth;
uint32_t rgb[3];
uint8_t *ptr;
int dsize;
+ const uint8_t *buf0 = buf;
if(buf_size < 14){
av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
return -1;
}
- 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;
}
- fsize = read32(&bits);
+ fsize = bytestream_get_le32(&buf);
if(buf_size < fsize){
- av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
+ av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d), 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 + 14 > hsize){
+ av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
return -1;
}
- skip_bits(&bits, 16); /* reserved1 */
- skip_bits(&bits, 16); /* reserved2 */
+ /* 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;
- hsize = read32(&bits); /* header size */
if(fsize <= hsize){
- av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
+ av_log(avctx, AV_LOG_ERROR, "declared file size is less than header size (%d < %d)\n",
fsize, hsize);
return -1;
}
- ihsize = read32(&bits); /* more header size */
- if(ihsize + 14 > hsize){
- av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
+ 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 -1;
}
- width = read32(&bits);
- height = read32(&bits);
-
- if(read16(&bits) != 1){ /* planes */
+ if(bytestream_get_le16(&buf) != 1){ /* planes */
av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
return -1;
}
- 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;
}
if(comp == BMP_BITFIELDS){
- skip_bits(&bits, 20 * 8);
- rgb[0] = read32(&bits);
- rgb[1] = read32(&bits);
- rgb[2] = read32(&bits);
+ 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;
case 16:
if(comp == BMP_RGB)
avctx->pix_fmt = PIX_FMT_RGB555;
+ if(comp == BMP_BITFIELDS)
+ avctx->pix_fmt = rgb[1] == 0x07E0 ? PIX_FMT_RGB565 : PIX_FMT_RGB555;
+ break;
+ case 8:
+ if(hsize - ihsize - 14 > 0)
+ avctx->pix_fmt = PIX_FMT_PAL8;
+ else
+ avctx->pix_fmt = PIX_FMT_GRAY8;
+ break;
+ case 4:
+ if(hsize - ihsize - 14 > 0){
+ avctx->pix_fmt = PIX_FMT_PAL8;
+ }else{
+ av_log(avctx, AV_LOG_ERROR, "Unknown palette for 16-colour BMP\n");
+ return -1;
+ }
+ break;
+ case 1:
+ avctx->pix_fmt = PIX_FMT_MONOBLACK;
break;
default:
av_log(avctx, AV_LOG_ERROR, "depth %d not supported\n", depth);
return -1;
}
+ if(p->data[0])
+ avctx->release_buffer(avctx, p);
+
p->reference = 0;
if(avctx->get_buffer(avctx, p) < 0){
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
- 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;
/* Line size in file multiple of 4 */
- n = (avctx->width * (depth / 8) + 3) & ~3;
+ 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;
}
+ // 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(depth == 4 || depth == 8)
+ memset(p->data[1], 0, 1024);
+
if(height > 0){
ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
linesize = -p->linesize[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 == PIX_FMT_PAL8){
+ int colors = 1 << depth;
+ 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 %d\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
+ if((hsize-ihsize-14) < (colors << 2)){ // OS/2 bitmap, 3 bytes per palette entry
+ 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];
+ }
+ ff_msrle_decode(avctx, (AVPicture*)p, depth, buf, dsize);
+ if(height < 0){
+ p->data[0] += p->linesize[0] * (avctx->height - 1);
+ p->linesize[0] = -p->linesize[0];
+ }
+ }else{
+ switch(depth){
+ case 1:
+ 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;
+
+ for(j = 0; j < avctx->width; j++)
+ *dst++ = av_le2ne16(*src++);
- buf += n;
- ptr += linesize;
+ 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 -1;
}
- break;
- default:
- av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
- return -1;
}
*picture = s->picture;
return buf_size;
}
-AVCodec bmp_decoder = {
+static av_cold int bmp_decode_end(AVCodecContext *avctx)
+{
+ BMPContext* c = avctx->priv_data;
+
+ if (c->picture.data[0])
+ avctx->release_buffer(avctx, &c->picture);
+
+ return 0;
+}
+
+AVCodec ff_bmp_decoder = {
"bmp",
- CODEC_TYPE_VIDEO,
+ AVMEDIA_TYPE_VIDEO,
CODEC_ID_BMP,
sizeof(BMPContext),
bmp_decode_init,
NULL,
- NULL,
- bmp_decode_frame
+ bmp_decode_end,
+ bmp_decode_frame,
+ CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("BMP image"),
};
projects / ffmpeg / blobdiff