| /* |
| * 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 "avcodec.h" |
| #include "bytestream.h" |
| #include "bmp.h" |
| #include "msrledec.h" |
| |
| static av_cold int bmp_decode_init(AVCodecContext *avctx){ |
| BMPContext *s = avctx->priv_data; |
| |
| avcodec_get_frame_defaults((AVFrame*)&s->picture); |
| avctx->coded_frame = (AVFrame*)&s->picture; |
| |
| return 0; |
| } |
| |
| static int bmp_decode_frame(AVCodecContext *avctx, |
| void *data, int *data_size, |
| const uint8_t *buf, int buf_size) |
| { |
| BMPContext *s = avctx->priv_data; |
| AVFrame *picture = data; |
| AVFrame *p = &s->picture; |
| unsigned int fsize, hsize; |
| int width, height; |
| unsigned int depth; |
| BiCompression comp; |
| unsigned int ihsize; |
| int i, j, n, linesize; |
| 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; |
| } |
| |
| if(bytestream_get_byte(&buf) != 'B' || |
| bytestream_get_byte(&buf) != 'M') { |
| av_log(avctx, AV_LOG_ERROR, "bad magic number\n"); |
| return -1; |
| } |
| |
| fsize = bytestream_get_le32(&buf); |
| if(buf_size < fsize){ |
| 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; |
| } |
| |
| /* 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 (%d < %d)\n", |
| fsize, hsize); |
| return -1; |
| } |
| |
| 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; |
| } |
| |
| if(bytestream_get_le16(&buf) != 1){ /* planes */ |
| av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n"); |
| return -1; |
| } |
| |
| 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 -1; |
| } |
| |
| 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->width = width; |
| avctx->height = height > 0? height: -height; |
| |
| avctx->pix_fmt = PIX_FMT_NONE; |
| |
| switch(depth){ |
| case 32: |
| 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]){ |
| break; |
| } |
| } else { |
| rgb[0] = 2; |
| rgb[1] = 1; |
| rgb[2] = 0; |
| } |
| |
| avctx->pix_fmt = PIX_FMT_BGR24; |
| break; |
| case 24: |
| avctx->pix_fmt = PIX_FMT_BGR24; |
| break; |
| 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(avctx->pix_fmt == PIX_FMT_NONE){ |
| av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n"); |
| 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->key_frame = 1; |
| |
| buf = buf0 + hsize; |
| dsize = buf_size - hsize; |
| |
| /* Line size in file multiple of 4 */ |
| n = ((avctx->width * depth) / 8 + 3) & ~3; |
| |
| 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(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 == PIX_FMT_PAL8){ |
| |
| memset(p->data[1], 0, 1024); |
| |
| buf = buf0 + 14 + ihsize; //palette location |
| if((hsize-ihsize-14)>>depth < 4){ // OS/2 bitmap, 3 bytes per palette entry |
| for(i = 0; i < (1 << depth); i++) |
| ((uint32_t*)p->data[1])[i] = bytestream_get_le24(&buf); |
| }else{ |
| for(i = 0; i < (1 << depth); i++) |
| ((uint32_t*)p->data[1])[i] = bytestream_get_le32(&buf); |
| } |
| buf = buf0 + hsize; |
| } |
| if(comp == BMP_RLE4 || comp == BMP_RLE8){ |
| ff_msrle_decode(avctx, (AVPicture*)p, depth, buf, dsize); |
| }else{ |
| switch(depth){ |
| case 1: |
| 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 8: |
| for(i = 0; i < avctx->height; i++){ |
| memcpy(ptr, buf, avctx->width); |
| buf += n; |
| ptr += linesize; |
| } |
| break; |
| case 24: |
| for(i = 0; i < avctx->height; i++){ |
| memcpy(ptr, buf, avctx->width*(depth>>3)); |
| 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++ = le2me_16(*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 -1; |
| } |
| } |
| |
| *picture = s->picture; |
| *data_size = sizeof(AVPicture); |
| |
| return buf_size; |
| } |
| |
| 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 bmp_decoder = { |
| "bmp", |
| CODEC_TYPE_VIDEO, |
| CODEC_ID_BMP, |
| sizeof(BMPContext), |
| bmp_decode_init, |
| NULL, |
| bmp_decode_end, |
| bmp_decode_frame, |
| .long_name = NULL_IF_CONFIG_SMALL("BMP image"), |
| }; |
