/* * 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 "internal.h"#include "msrledec.h" static int bmp_decode_frame(AVCodecContext *avctx,                            void *data, int *got_frame,                            AVPacket *avpkt){    const uint8_t *buf = avpkt->data;    int buf_size       = avpkt->size;    AVFrame *p         = data;    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:        av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome\n");        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);    }     avctx->width  = width;    avctx->height = height > 0 ? height : -(unsigned)height;     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 %0X %0X %0X\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 < 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:        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;} 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,};