[deb_ffmpeg.git] / ffmpeg / libavcodec / bmp.c

/*
 * 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 : -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) {
        av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
               dsize, n * avctx->height);
        return AVERROR_INVALIDDATA;
    }

    // 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, (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:
        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;
        }
    }

    *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   = CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* BMP image format decoder
	3	* Copyright (c) 2005 Mans Rullgard
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include <inttypes.h>
	23
	24	#include "avcodec.h"
	25	#include "bytestream.h"
	26	#include "bmp.h"
	27	#include "internal.h"
	28	#include "msrledec.h"
	29
	30	static int bmp_decode_frame(AVCodecContext *avctx,
	31	void data, int got_frame,
	32	AVPacket *avpkt)
	33	{
	34	const uint8_t *buf = avpkt->data;
	35	int buf_size = avpkt->size;
	36	AVFrame *p = data;
	37	unsigned int fsize, hsize;
	38	int width, height;
	39	unsigned int depth;
	40	BiCompression comp;
	41	unsigned int ihsize;
	42	int i, j, n, linesize, ret;
	43	uint32_t rgb[3] = {0};
	44	uint32_t alpha = 0;
	45	uint8_t *ptr;
	46	int dsize;
	47	const uint8_t *buf0 = buf;
	48	GetByteContext gb;
	49
	50	if (buf_size < 14) {
	51	av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
	52	return AVERROR_INVALIDDATA;
	53	}
	54
	55	if (bytestream_get_byte(&buf) != 'B' \|\|
	56	bytestream_get_byte(&buf) != 'M') {
	57	av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
	58	return AVERROR_INVALIDDATA;
	59	}
	60
	61	fsize = bytestream_get_le32(&buf);
	62	if (buf_size < fsize) {
	63	av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %u), trying to decode anyway\n",
	64	buf_size, fsize);
65	fsize = buf_size;
66	}
67
68	buf += 2; /* reserved1 */
69	buf += 2; /* reserved2 */
70
71	hsize = bytestream_get_le32(&buf); /* header size */
72	ihsize = bytestream_get_le32(&buf); /* more header size */
73	if (ihsize + 14LL > hsize) {
74	av_log(avctx, AV_LOG_ERROR, "invalid header size %u\n", hsize);
75	return AVERROR_INVALIDDATA;
76	}
77
78	/* sometimes file size is set to some headers size, set a real size in that case */
79	if (fsize == 14 \|\| fsize == ihsize + 14)
80	fsize = buf_size - 2;
81
82	if (fsize <= hsize) {
83	av_log(avctx, AV_LOG_ERROR,
84	"Declared file size is less than header size (%u < %u)\n",
85	fsize, hsize);
86	return AVERROR_INVALIDDATA;
87	}
88
89	switch (ihsize) {
90	case 40: // windib
91	case 56: // windib v3
92	case 64: // OS/2 v2
93	case 108: // windib v4
94	case 124: // windib v5
95	width = bytestream_get_le32(&buf);
96	height = bytestream_get_le32(&buf);
97	break;
98	case 12: // OS/2 v1
99	width = bytestream_get_le16(&buf);
100	height = bytestream_get_le16(&buf);
101	break;
102	default:
103	av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome\n");
104	return AVERROR_PATCHWELCOME;
105	}
106
107	/* planes */
108	if (bytestream_get_le16(&buf) != 1) {
109	av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
110	return AVERROR_INVALIDDATA;
111	}
112
113	depth = bytestream_get_le16(&buf);
114
115	if (ihsize >= 40)
116	comp = bytestream_get_le32(&buf);
117	else
118	comp = BMP_RGB;
119
120	if (comp != BMP_RGB && comp != BMP_BITFIELDS && comp != BMP_RLE4 &&
121	comp != BMP_RLE8) {
122	av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
123	return AVERROR_INVALIDDATA;
124	}
125
126	if (comp == BMP_BITFIELDS) {
127	buf += 20;
128	rgb[0] = bytestream_get_le32(&buf);
129	rgb[1] = bytestream_get_le32(&buf);
130	rgb[2] = bytestream_get_le32(&buf);
131	if (ihsize > 40)
132	alpha = bytestream_get_le32(&buf);
133	}
134
135	avctx->width = width;
136	avctx->height = height > 0 ? height : -height;
137
138	avctx->pix_fmt = AV_PIX_FMT_NONE;
139
140	switch (depth) {
141	case 32:
142	if (comp == BMP_BITFIELDS) {
143	if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00)
144	avctx->pix_fmt = alpha ? AV_PIX_FMT_ABGR : AV_PIX_FMT_0BGR;
145	else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF)
146	avctx->pix_fmt = alpha ? AV_PIX_FMT_BGRA : AV_PIX_FMT_BGR0;
147	else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000)
148	avctx->pix_fmt = alpha ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
149	else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000)
150	avctx->pix_fmt = alpha ? AV_PIX_FMT_RGBA : AV_PIX_FMT_RGB0;
151	else {
152	av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
153	return AVERROR(EINVAL);
154	}
155	} else {
156	avctx->pix_fmt = AV_PIX_FMT_BGRA;
157	}
158	break;
159	case 24:
160	avctx->pix_fmt = AV_PIX_FMT_BGR24;
161	break;
162	case 16:
163	if (comp == BMP_RGB)
164	avctx->pix_fmt = AV_PIX_FMT_RGB555;
165	else if (comp == BMP_BITFIELDS) {
166	if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F)
167	avctx->pix_fmt = AV_PIX_FMT_RGB565;
168	else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F)
169	avctx->pix_fmt = AV_PIX_FMT_RGB555;
170	else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F)
171	avctx->pix_fmt = AV_PIX_FMT_RGB444;
172	else {
173	av_log(avctx, AV_LOG_ERROR,
174	"Unknown bitfields %0"PRIX32" %0"PRIX32" %0"PRIX32"\n",
175	rgb[0], rgb[1], rgb[2]);
176	return AVERROR(EINVAL);
177	}
178	}
179	break;
180	case 8:
181	if (hsize - ihsize - 14 > 0)
182	avctx->pix_fmt = AV_PIX_FMT_PAL8;
183	else
184	avctx->pix_fmt = AV_PIX_FMT_GRAY8;
185	break;
186	case 1:
187	case 4:
188	if (hsize - ihsize - 14 > 0) {
189	avctx->pix_fmt = AV_PIX_FMT_PAL8;
190	} else {
191	av_log(avctx, AV_LOG_ERROR, "Unknown palette for %u-colour BMP\n",
192	1 << depth);
193	return AVERROR_INVALIDDATA;
194	}
195	break;
196	default:
197	av_log(avctx, AV_LOG_ERROR, "depth %u not supported\n", depth);
198	return AVERROR_INVALIDDATA;
199	}
200
201	if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
202	av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
203	return AVERROR_INVALIDDATA;
204	}
205
206	if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
207	return ret;
208	p->pict_type = AV_PICTURE_TYPE_I;
209	p->key_frame = 1;
210
211	buf = buf0 + hsize;
212	dsize = buf_size - hsize;
213
214	/* Line size in file multiple of 4 */
215	n = ((avctx->width * depth + 31) / 8) & ~3;
216
217	if (n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8) {
218	av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
219	dsize, n * avctx->height);
220	return AVERROR_INVALIDDATA;
221	}
222
223	// RLE may skip decoding some picture areas, so blank picture before decoding
224	if (comp == BMP_RLE4 \|\| comp == BMP_RLE8)
225	memset(p->data[0], 0, avctx->height * p->linesize[0]);
226
227	if (height > 0) {
228	ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
229	linesize = -p->linesize[0];
230	} else {
231	ptr = p->data[0];
232	linesize = p->linesize[0];
233	}
234
235	if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
236	int colors = 1 << depth;
237
238	memset(p->data[1], 0, 1024);
239
240	if (ihsize >= 36) {
241	int t;
242	buf = buf0 + 46;
243	t = bytestream_get_le32(&buf);
244	if (t < 0 \|\| t > (1 << depth)) {
245	av_log(avctx, AV_LOG_ERROR,
246	"Incorrect number of colors - %X for bitdepth %u\n",
247	t, depth);
248	} else if (t) {
249	colors = t;
250	}
251	} else {
252	colors = FFMIN(256, (hsize-ihsize-14) / 3);
253	}
254	buf = buf0 + 14 + ihsize; //palette location
255	// OS/2 bitmap, 3 bytes per palette entry
256	if ((hsize-ihsize-14) < (colors << 2)) {
257	if ((hsize-ihsize-14) < colors * 3) {
258	av_log(avctx, AV_LOG_ERROR, "palette doesn't fit in packet\n");
259	return AVERROR_INVALIDDATA;
260	}
261	for (i = 0; i < colors; i++)
262	((uint32_t*)p->data[1])[i] = (0xFFU<<24) \| bytestream_get_le24(&buf);
263	} else {
264	for (i = 0; i < colors; i++)
265	((uint32_t*)p->data[1])[i] = 0xFFU << 24 \| bytestream_get_le32(&buf);
266	}
267	buf = buf0 + hsize;
268	}
269	if (comp == BMP_RLE4 \|\| comp == BMP_RLE8) {
270	if (comp == BMP_RLE8 && height < 0) {
271	p->data[0] += p->linesize[0] * (avctx->height - 1);
272	p->linesize[0] = -p->linesize[0];
273	}
274	bytestream2_init(&gb, buf, dsize);
275	ff_msrle_decode(avctx, (AVPicture*)p, depth, &gb);
276	if (height < 0) {
277	p->data[0] += p->linesize[0] * (avctx->height - 1);
278	p->linesize[0] = -p->linesize[0];
279	}
280	} else {
281	switch (depth) {
282	case 1:
283	for (i = 0; i < avctx->height; i++) {
284	int j;
285	for (j = 0; j < n; j++) {
286	ptr[j*8+0] = buf[j] >> 7;
287	ptr[j*8+1] = (buf[j] >> 6) & 1;
288	ptr[j*8+2] = (buf[j] >> 5) & 1;
289	ptr[j*8+3] = (buf[j] >> 4) & 1;
290	ptr[j*8+4] = (buf[j] >> 3) & 1;
291	ptr[j*8+5] = (buf[j] >> 2) & 1;
292	ptr[j*8+6] = (buf[j] >> 1) & 1;
293	ptr[j*8+7] = buf[j] & 1;
294	}
295	buf += n;
296	ptr += linesize;
297	}
298	break;
299	case 8:
300	case 24:
301	case 32:
302	for (i = 0; i < avctx->height; i++) {
303	memcpy(ptr, buf, n);
304	buf += n;
305	ptr += linesize;
306	}
307	break;
308	case 4:
309	for (i = 0; i < avctx->height; i++) {
310	int j;
311	for (j = 0; j < n; j++) {
312	ptr[j*2+0] = (buf[j] >> 4) & 0xF;
313	ptr[j*2+1] = buf[j] & 0xF;
314	}
315	buf += n;
316	ptr += linesize;
317	}
318	break;
319	case 16:
320	for (i = 0; i < avctx->height; i++) {
321	const uint16_t src = (const uint16_t ) buf;
322	uint16_t dst = (uint16_t ) ptr;
323
324	for (j = 0; j < avctx->width; j++)
325	dst++ = av_le2ne16(src++);
326
327	buf += n;
328	ptr += linesize;
329	}
330	break;
331	default:
332	av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
333	return AVERROR_INVALIDDATA;
334	}
335	}
336
337	*got_frame = 1;
338
339	return buf_size;
340	}
341
342	AVCodec ff_bmp_decoder = {
343	.name = "bmp",
344	.long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
345	.type = AVMEDIA_TYPE_VIDEO,
346	.id = AV_CODEC_ID_BMP,
347	.decode = bmp_decode_frame,
348	.capabilities = CODEC_CAP_DR1,
349	};