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

/*
 * PC Paintbrush PCX (.pcx) image decoder
 * Copyright (c) 2007, 2008 Ivo van Poorten
 *
 * This decoder does not support CGA palettes. I am unable to find samples
 * and Netpbm cannot generate them.
 *
 * 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 "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "get_bits.h"
#include "internal.h"

static void pcx_rle_decode(GetByteContext *gb,
                           uint8_t *dst,
                           unsigned int bytes_per_scanline,
                           int compressed)
{
    unsigned int i = 0;
    unsigned char run, value;

    if (compressed) {
        while (i < bytes_per_scanline && bytestream2_get_bytes_left(gb)>0) {
            run   = 1;
            value = bytestream2_get_byte(gb);
            if (value >= 0xc0 && bytestream2_get_bytes_left(gb)>0) {
                run   = value & 0x3f;
                value = bytestream2_get_byte(gb);
            }
            while (i < bytes_per_scanline && run--)
                dst[i++] = value;
        }
    } else {
        bytestream2_get_buffer(gb, dst, bytes_per_scanline);
    }
}

static void pcx_palette(GetByteContext *gb, uint32_t *dst, int pallen)
{
    int i;

    pallen = FFMIN(pallen, bytestream2_get_bytes_left(gb) / 3);
    for (i = 0; i < pallen; i++)
        *dst++ = 0xFF000000 | bytestream2_get_be24u(gb);
    if (pallen < 256)
        memset(dst, 0, (256 - pallen) * sizeof(*dst));
}

static int pcx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                            AVPacket *avpkt)
{
    GetByteContext gb;
    AVFrame * const p  = data;
    int compressed, xmin, ymin, xmax, ymax;
    int ret;
    unsigned int w, h, bits_per_pixel, bytes_per_line, nplanes, stride, y, x,
                 bytes_per_scanline;
    uint8_t *ptr, *scanline;

    if (avpkt->size < 128)
        return AVERROR_INVALIDDATA;

    bytestream2_init(&gb, avpkt->data, avpkt->size);

    if (bytestream2_get_byteu(&gb) != 0x0a || bytestream2_get_byteu(&gb) > 5) {
        av_log(avctx, AV_LOG_ERROR, "this is not PCX encoded data\n");
        return AVERROR_INVALIDDATA;
    }

    compressed                     = bytestream2_get_byteu(&gb);
    bits_per_pixel                 = bytestream2_get_byteu(&gb);
    xmin                           = bytestream2_get_le16u(&gb);
    ymin                           = bytestream2_get_le16u(&gb);
    xmax                           = bytestream2_get_le16u(&gb);
    ymax                           = bytestream2_get_le16u(&gb);
    avctx->sample_aspect_ratio.num = bytestream2_get_le16u(&gb);
    avctx->sample_aspect_ratio.den = bytestream2_get_le16u(&gb);

    if (xmax < xmin || ymax < ymin) {
        av_log(avctx, AV_LOG_ERROR, "invalid image dimensions\n");
        return AVERROR_INVALIDDATA;
    }

    w = xmax - xmin + 1;
    h = ymax - ymin + 1;

    bytestream2_skipu(&gb, 49);
    nplanes            = bytestream2_get_byteu(&gb);
    bytes_per_line     = bytestream2_get_le16u(&gb);
    bytes_per_scanline = nplanes * bytes_per_line;

    if (bytes_per_scanline < (w * bits_per_pixel * nplanes + 7) / 8 ||
        (!compressed && bytes_per_scanline > bytestream2_get_bytes_left(&gb) / h)) {
        av_log(avctx, AV_LOG_ERROR, "PCX data is corrupted\n");
        return AVERROR_INVALIDDATA;
    }

    switch ((nplanes << 8) + bits_per_pixel) {
    case 0x0308:
        avctx->pix_fmt = AV_PIX_FMT_RGB24;
        break;
    case 0x0108:
    case 0x0104:
    case 0x0102:
    case 0x0101:
    case 0x0401:
    case 0x0301:
    case 0x0201:
        avctx->pix_fmt = AV_PIX_FMT_PAL8;
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "invalid PCX file\n");
        return AVERROR_INVALIDDATA;
    }

    bytestream2_skipu(&gb, 60);

    if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
        return ret;

    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
        return ret;

    p->pict_type = AV_PICTURE_TYPE_I;

    ptr    = p->data[0];
    stride = p->linesize[0];

    scanline = av_malloc(bytes_per_scanline + FF_INPUT_BUFFER_PADDING_SIZE);
    if (!scanline)
        return AVERROR(ENOMEM);

    if (nplanes == 3 && bits_per_pixel == 8) {
        for (y = 0; y < h; y++) {
            pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);

            for (x = 0; x < w; x++) {
                ptr[3 * x]     = scanline[x];
                ptr[3 * x + 1] = scanline[x + bytes_per_line];
                ptr[3 * x + 2] = scanline[x + (bytes_per_line << 1)];
            }

            ptr += stride;
        }
    } else if (nplanes == 1 && bits_per_pixel == 8) {
        int palstart = avpkt->size - 769;

        if (avpkt->size < 769) {
            av_log(avctx, AV_LOG_ERROR, "File is too short\n");
            ret = avctx->err_recognition & AV_EF_EXPLODE ?
                  AVERROR_INVALIDDATA : avpkt->size;
            goto end;
        }

        for (y = 0; y < h; y++, ptr += stride) {
            pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
            memcpy(ptr, scanline, w);
        }

        if (bytestream2_tell(&gb) != palstart) {
            av_log(avctx, AV_LOG_WARNING, "image data possibly corrupted\n");
            bytestream2_seek(&gb, palstart, SEEK_SET);
        }
        if (bytestream2_get_byte(&gb) != 12) {
            av_log(avctx, AV_LOG_ERROR, "expected palette after image data\n");
            ret = avctx->err_recognition & AV_EF_EXPLODE ?
                  AVERROR_INVALIDDATA : avpkt->size;
            goto end;
        }
    } else if (nplanes == 1) {   /* all packed formats, max. 16 colors */
        GetBitContext s;

        for (y = 0; y < h; y++) {
            init_get_bits8(&s, scanline, bytes_per_scanline);

            pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);

            for (x = 0; x < w; x++)
                ptr[x] = get_bits(&s, bits_per_pixel);
            ptr += stride;
        }
    } else {    /* planar, 4, 8 or 16 colors */
        int i;

        for (y = 0; y < h; y++) {
            pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);

            for (x = 0; x < w; x++) {
                int m = 0x80 >> (x & 7), v = 0;
                for (i = nplanes - 1; i >= 0; i--) {
                    v <<= 1;
                    v  += !!(scanline[i * bytes_per_line + (x >> 3)] & m);
                }
                ptr[x] = v;
            }
            ptr += stride;
        }
    }

    ret = bytestream2_tell(&gb);
    if (nplanes == 1 && bits_per_pixel == 8) {
        pcx_palette(&gb, (uint32_t *)p->data[1], 256);
        ret += 256 * 3;
    } else if (bits_per_pixel * nplanes == 1) {
        AV_WN32A(p->data[1]  , 0xFF000000);
        AV_WN32A(p->data[1]+4, 0xFFFFFFFF);
    } else if (bits_per_pixel < 8) {
        bytestream2_seek(&gb, 16, SEEK_SET);
        pcx_palette(&gb, (uint32_t *)p->data[1], 16);
    }

    *got_frame = 1;

end:
    av_free(scanline);
    return ret;
}

AVCodec ff_pcx_decoder = {
    .name         = "pcx",
    .long_name    = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
    .type         = AVMEDIA_TYPE_VIDEO,
    .id           = AV_CODEC_ID_PCX,
    .decode       = pcx_decode_frame,
    .capabilities = CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* PC Paintbrush PCX (.pcx) image decoder
	3	* Copyright (c) 2007, 2008 Ivo van Poorten
	4	*
	5	* This decoder does not support CGA palettes. I am unable to find samples
	6	* and Netpbm cannot generate them.
	7	*
	8	* This file is part of FFmpeg.
	9	*
	10	* FFmpeg is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU Lesser General Public
	12	* License as published by the Free Software Foundation; either
	13	* version 2.1 of the License, or (at your option) any later version.
	14	*
	15	* FFmpeg is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* Lesser General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU Lesser General Public
	21	* License along with FFmpeg; if not, write to the Free Software
	22	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	23	*/
	24
	25	#include "libavutil/imgutils.h"
	26	#include "avcodec.h"
	27	#include "bytestream.h"
	28	#include "get_bits.h"
	29	#include "internal.h"
	30
	31	static void pcx_rle_decode(GetByteContext *gb,
	32	uint8_t *dst,
	33	unsigned int bytes_per_scanline,
	34	int compressed)
	35	{
	36	unsigned int i = 0;
	37	unsigned char run, value;
	38
	39	if (compressed) {
	40	while (i < bytes_per_scanline && bytestream2_get_bytes_left(gb)>0) {
	41	run = 1;
	42	value = bytestream2_get_byte(gb);
	43	if (value >= 0xc0 && bytestream2_get_bytes_left(gb)>0) {
	44	run = value & 0x3f;
	45	value = bytestream2_get_byte(gb);
	46	}
	47	while (i < bytes_per_scanline && run--)
	48	dst[i++] = value;
	49	}
	50	} else {
	51	bytestream2_get_buffer(gb, dst, bytes_per_scanline);
	52	}
	53	}
	54
	55	static void pcx_palette(GetByteContext gb, uint32_t dst, int pallen)
	56	{
	57	int i;
	58
	59	pallen = FFMIN(pallen, bytestream2_get_bytes_left(gb) / 3);
	60	for (i = 0; i < pallen; i++)
	61	*dst++ = 0xFF000000 \| bytestream2_get_be24u(gb);
	62	if (pallen < 256)
	63	memset(dst, 0, (256 - pallen) * sizeof(*dst));
	64	}
65
66	static int pcx_decode_frame(AVCodecContext avctx, void data, int *got_frame,
67	AVPacket *avpkt)
68	{
69	GetByteContext gb;
70	AVFrame * const p = data;
71	int compressed, xmin, ymin, xmax, ymax;
72	int ret;
73	unsigned int w, h, bits_per_pixel, bytes_per_line, nplanes, stride, y, x,
74	bytes_per_scanline;
75	uint8_t ptr, scanline;
76
77	if (avpkt->size < 128)
78	return AVERROR_INVALIDDATA;
79
80	bytestream2_init(&gb, avpkt->data, avpkt->size);
81
82	if (bytestream2_get_byteu(&gb) != 0x0a \|\| bytestream2_get_byteu(&gb) > 5) {
83	av_log(avctx, AV_LOG_ERROR, "this is not PCX encoded data\n");
84	return AVERROR_INVALIDDATA;
85	}
86
87	compressed = bytestream2_get_byteu(&gb);
88	bits_per_pixel = bytestream2_get_byteu(&gb);
89	xmin = bytestream2_get_le16u(&gb);
90	ymin = bytestream2_get_le16u(&gb);
91	xmax = bytestream2_get_le16u(&gb);
92	ymax = bytestream2_get_le16u(&gb);
93	avctx->sample_aspect_ratio.num = bytestream2_get_le16u(&gb);
94	avctx->sample_aspect_ratio.den = bytestream2_get_le16u(&gb);
95
96	if (xmax < xmin \|\| ymax < ymin) {
97	av_log(avctx, AV_LOG_ERROR, "invalid image dimensions\n");
98	return AVERROR_INVALIDDATA;
99	}
100
101	w = xmax - xmin + 1;
102	h = ymax - ymin + 1;
103
104	bytestream2_skipu(&gb, 49);
105	nplanes = bytestream2_get_byteu(&gb);
106	bytes_per_line = bytestream2_get_le16u(&gb);
107	bytes_per_scanline = nplanes * bytes_per_line;
108
109	if (bytes_per_scanline < (w * bits_per_pixel * nplanes + 7) / 8 \|\|
110	(!compressed && bytes_per_scanline > bytestream2_get_bytes_left(&gb) / h)) {
111	av_log(avctx, AV_LOG_ERROR, "PCX data is corrupted\n");
112	return AVERROR_INVALIDDATA;
113	}
114
115	switch ((nplanes << 8) + bits_per_pixel) {
116	case 0x0308:
117	avctx->pix_fmt = AV_PIX_FMT_RGB24;
118	break;
119	case 0x0108:
120	case 0x0104:
121	case 0x0102:
122	case 0x0101:
123	case 0x0401:
124	case 0x0301:
125	case 0x0201:
126	avctx->pix_fmt = AV_PIX_FMT_PAL8;
127	break;
128	default:
129	av_log(avctx, AV_LOG_ERROR, "invalid PCX file\n");
130	return AVERROR_INVALIDDATA;
131	}
132
133	bytestream2_skipu(&gb, 60);
134
135	if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
136	return ret;
137
138	if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
139	return ret;
140
141	p->pict_type = AV_PICTURE_TYPE_I;
142
143	ptr = p->data[0];
144	stride = p->linesize[0];
145
146	scanline = av_malloc(bytes_per_scanline + FF_INPUT_BUFFER_PADDING_SIZE);
147	if (!scanline)
148	return AVERROR(ENOMEM);
149
150	if (nplanes == 3 && bits_per_pixel == 8) {
151	for (y = 0; y < h; y++) {
152	pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
153
154	for (x = 0; x < w; x++) {
155	ptr[3 * x] = scanline[x];
156	ptr[3 * x + 1] = scanline[x + bytes_per_line];
157	ptr[3 * x + 2] = scanline[x + (bytes_per_line << 1)];
158	}
159
160	ptr += stride;
161	}
162	} else if (nplanes == 1 && bits_per_pixel == 8) {
163	int palstart = avpkt->size - 769;
164
165	if (avpkt->size < 769) {
166	av_log(avctx, AV_LOG_ERROR, "File is too short\n");
167	ret = avctx->err_recognition & AV_EF_EXPLODE ?
168	AVERROR_INVALIDDATA : avpkt->size;
169	goto end;
170	}
171
172	for (y = 0; y < h; y++, ptr += stride) {
173	pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
174	memcpy(ptr, scanline, w);
175	}
176
177	if (bytestream2_tell(&gb) != palstart) {
178	av_log(avctx, AV_LOG_WARNING, "image data possibly corrupted\n");
179	bytestream2_seek(&gb, palstart, SEEK_SET);
180	}
181	if (bytestream2_get_byte(&gb) != 12) {
182	av_log(avctx, AV_LOG_ERROR, "expected palette after image data\n");
183	ret = avctx->err_recognition & AV_EF_EXPLODE ?
184	AVERROR_INVALIDDATA : avpkt->size;
185	goto end;
186	}
187	} else if (nplanes == 1) { /* all packed formats, max. 16 colors */
188	GetBitContext s;
189
190	for (y = 0; y < h; y++) {
191	init_get_bits8(&s, scanline, bytes_per_scanline);
192
193	pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
194
195	for (x = 0; x < w; x++)
196	ptr[x] = get_bits(&s, bits_per_pixel);
197	ptr += stride;
198	}
199	} else { /* planar, 4, 8 or 16 colors */
200	int i;
201
202	for (y = 0; y < h; y++) {
203	pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
204
205	for (x = 0; x < w; x++) {
206	int m = 0x80 >> (x & 7), v = 0;
207	for (i = nplanes - 1; i >= 0; i--) {
208	v <<= 1;
209	v += !!(scanline[i * bytes_per_line + (x >> 3)] & m);
210	}
211	ptr[x] = v;
212	}
213	ptr += stride;
214	}
215	}
216
217	ret = bytestream2_tell(&gb);
218	if (nplanes == 1 && bits_per_pixel == 8) {
219	pcx_palette(&gb, (uint32_t *)p->data[1], 256);
220	ret += 256 * 3;
221	} else if (bits_per_pixel * nplanes == 1) {
222	AV_WN32A(p->data[1] , 0xFF000000);
223	AV_WN32A(p->data[1]+4, 0xFFFFFFFF);
224	} else if (bits_per_pixel < 8) {
225	bytestream2_seek(&gb, 16, SEEK_SET);
226	pcx_palette(&gb, (uint32_t *)p->data[1], 16);
227	}
228
229	*got_frame = 1;
230
231	end:
232	av_free(scanline);
233	return ret;
234	}
235
236	AVCodec ff_pcx_decoder = {
237	.name = "pcx",
238	.long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
239	.type = AVMEDIA_TYPE_VIDEO,
240	.id = AV_CODEC_ID_PCX,
241	.decode = pcx_decode_frame,
242	.capabilities = CODEC_CAP_DR1,
243	};