| /* | |
| * 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 "decode.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->flags |= AV_FRAME_FLAG_KEY; | |
| 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", | |
| CODEC_LONG_NAME("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), | |
| }; |