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

/*
 * Targa (.tga) image decoder
 * Copyright (c) 2006 Konstantin Shishkov
 *
 * 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/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "targa.h"

typedef struct TargaContext {
    GetByteContext gb;
} TargaContext;

static uint8_t *advance_line(uint8_t *start, uint8_t *line,
                             int stride, int *y, int h, int interleave)
{
    *y += interleave;

    if (*y < h) {
        return line + interleave * stride;
    } else {
        *y = (*y + 1) & (interleave - 1);
        if (*y && *y < h) {
            return start + *y * stride;
        } else {
            return NULL;
        }
    }
}

static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s,
                            uint8_t *start, int w, int h, int stride,
                            int bpp, int interleave)
{
    int x, y;
    int depth = (bpp + 1) >> 3;
    int type, count;
    uint8_t *line = start;
    uint8_t *dst  = line;

    x = y = count = 0;
    while (dst) {
        if (bytestream2_get_bytes_left(&s->gb) <= 0) {
            av_log(avctx, AV_LOG_ERROR,
                   "Ran ouf of data before end-of-image\n");
            return AVERROR_INVALIDDATA;
        }
        type  = bytestream2_get_byteu(&s->gb);
        count = (type & 0x7F) + 1;
        type &= 0x80;
        if (!type) {
            do {
                int n  = FFMIN(count, w - x);
                bytestream2_get_buffer(&s->gb, dst, n * depth);
                count -= n;
                dst   += n * depth;
                x     += n;
                if (x == w) {
                    x    = 0;
                    dst = line = advance_line(start, line, stride, &y, h, interleave);
                }
            } while (dst && count > 0);
        } else {
            uint8_t tmp[4];
            bytestream2_get_buffer(&s->gb, tmp, depth);
            do {
                int n  = FFMIN(count, w - x);
                count -= n;
                x     += n;
                do {
                    memcpy(dst, tmp, depth);
                    dst += depth;
                } while (--n);
                if (x == w) {
                    x    = 0;
                    dst = line = advance_line(start, line, stride, &y, h, interleave);
                }
            } while (dst && count > 0);
        }
    }

    if (count) {
        av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n");
        return AVERROR_INVALIDDATA;
    }

    return 0;
}

static int decode_frame(AVCodecContext *avctx,
                        void *data, int *got_frame,
                        AVPacket *avpkt)
{
    TargaContext * const s = avctx->priv_data;
    AVFrame * const p = data;
    uint8_t *dst;
    int stride;
    int idlen, pal, compr, y, w, h, bpp, flags, ret;
    int first_clr, colors, csize;
    int interleave;

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

    /* parse image header */
    idlen     = bytestream2_get_byte(&s->gb);
    pal       = bytestream2_get_byte(&s->gb);
    compr     = bytestream2_get_byte(&s->gb);
    first_clr = bytestream2_get_le16(&s->gb);
    colors    = bytestream2_get_le16(&s->gb);
    csize     = bytestream2_get_byte(&s->gb);
    bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */
    w         = bytestream2_get_le16(&s->gb);
    h         = bytestream2_get_le16(&s->gb);
    bpp       = bytestream2_get_byte(&s->gb);

    if (bytestream2_get_bytes_left(&s->gb) <= idlen) {
        av_log(avctx, AV_LOG_ERROR,
                "Not enough data to read header\n");
        return AVERROR_INVALIDDATA;
    }

    flags     = bytestream2_get_byte(&s->gb);

    if (!pal && (first_clr || colors || csize)) {
        av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
        // specification says we should ignore those value in this case
        first_clr = colors = csize = 0;
    }

    // skip identifier if any
    bytestream2_skip(&s->gb, idlen);

    switch (bpp) {
    case 8:
        avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8;
        break;
    case 15:
    case 16:
        avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
        break;
    case 24:
        avctx->pix_fmt = AV_PIX_FMT_BGR24;
        break;
    case 32:
        avctx->pix_fmt = AV_PIX_FMT_BGRA;
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp);
        return AVERROR_INVALIDDATA;
    }

    if (colors && (colors + first_clr) > 256) {
        av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
        return AVERROR_INVALIDDATA;
    }

    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;

    if (flags & TGA_TOPTOBOTTOM) {
        dst = p->data[0];
        stride = p->linesize[0];
    } else { //image is upside-down
        dst = p->data[0] + p->linesize[0] * (h - 1);
        stride = -p->linesize[0];
    }

    interleave = flags & TGA_INTERLEAVE2 ? 2 :
                 flags & TGA_INTERLEAVE4 ? 4 : 1;

    if (colors) {
        int pal_size, pal_sample_size;

        switch (csize) {
        case 32: pal_sample_size = 4; break;
        case 24: pal_sample_size = 3; break;
        case 16:
        case 15: pal_sample_size = 2; break;
        default:
            av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
            return AVERROR_INVALIDDATA;
        }
        pal_size = colors * pal_sample_size;
        if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway
            bytestream2_skip(&s->gb, pal_size);
        else {
            int t;
            uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;

            if (bytestream2_get_bytes_left(&s->gb) < pal_size) {
                av_log(avctx, AV_LOG_ERROR,
                       "Not enough data to read palette\n");
                return AVERROR_INVALIDDATA;
            }
            switch (pal_sample_size) {
            case 4:
                for (t = 0; t < colors; t++)
                    *pal++ = bytestream2_get_le32u(&s->gb);
                break;
            case 3:
                /* RGB24 */
                for (t = 0; t < colors; t++)
                    *pal++ = (0xffU<<24) | bytestream2_get_le24u(&s->gb);
                break;
            case 2:
                /* RGB555 */
                for (t = 0; t < colors; t++) {
                    uint32_t v = bytestream2_get_le16u(&s->gb);
                    v = ((v & 0x7C00) <<  9) |
                        ((v & 0x03E0) <<  6) |
                        ((v & 0x001F) <<  3);
                    /* left bit replication */
                    v |= (v & 0xE0E0E0U) >> 5;
                    *pal++ = (0xffU<<24) | v;
                }
                break;
            }
            p->palette_has_changed = 1;
        }
    }

    if ((compr & (~TGA_RLE)) == TGA_NODATA) {
        memset(p->data[0], 0, p->linesize[0] * h);
    } else {
        if (compr & TGA_RLE) {
            int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave);
            if (res < 0)
                return res;
        } else {
            size_t img_size = w * ((bpp + 1) >> 3);
            uint8_t *line;
            if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
                av_log(avctx, AV_LOG_ERROR,
                       "Not enough data available for image\n");
                return AVERROR_INVALIDDATA;
            }

            line = dst;
            y = 0;
            do {
                bytestream2_get_buffer(&s->gb, line, img_size);
                line = advance_line(dst, line, stride, &y, h, interleave);
            } while (line);
        }
    }

    if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip
        int x;
        for (y = 0; y < h; y++) {
            void *line = &p->data[0][y * p->linesize[0]];
            for (x = 0; x < w >> 1; x++) {
                switch (bpp) {
                case 32:
                    FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[w - x - 1]);
                    break;
                case 24:
                    FFSWAP(uint8_t, ((uint8_t *)line)[3 * x    ], ((uint8_t *)line)[3 * w - 3 * x - 3]);
                    FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * w - 3 * x - 2]);
                    FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * w - 3 * x - 1]);
                    break;
                case 16:
                    FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[w - x - 1]);
                    break;
                case 8:
                    FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[w - x - 1]);
                }
            }
        }
    }

    *got_frame = 1;

    return avpkt->size;
}

AVCodec ff_targa_decoder = {
    .name           = "targa",
    .long_name      = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_TARGA,
    .priv_data_size = sizeof(TargaContext),
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Targa (.tga) image decoder
	3	* Copyright (c) 2006 Konstantin Shishkov
	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 "libavutil/intreadwrite.h"
	23	#include "libavutil/imgutils.h"
	24	#include "avcodec.h"
	25	#include "bytestream.h"
	26	#include "internal.h"
	27	#include "targa.h"
	28
	29	typedef struct TargaContext {
	30	GetByteContext gb;
	31	} TargaContext;
	32
	33	static uint8_t advance_line(uint8_t start, uint8_t *line,
	34	int stride, int *y, int h, int interleave)
	35	{
	36	*y += interleave;
	37
	38	if (*y < h) {
	39	return line + interleave * stride;
	40	} else {
	41	y = (y + 1) & (interleave - 1);
	42	if (y && y < h) {
	43	return start + y stride;
	44	} else {
	45	return NULL;
	46	}
	47	}
	48	}
	49
	50	static int targa_decode_rle(AVCodecContext avctx, TargaContext s,
	51	uint8_t *start, int w, int h, int stride,
	52	int bpp, int interleave)
	53	{
	54	int x, y;
	55	int depth = (bpp + 1) >> 3;
	56	int type, count;
	57	uint8_t *line = start;
	58	uint8_t *dst = line;
	59
	60	x = y = count = 0;
	61	while (dst) {
	62	if (bytestream2_get_bytes_left(&s->gb) <= 0) {
	63	av_log(avctx, AV_LOG_ERROR,
	64	"Ran ouf of data before end-of-image\n");
65	return AVERROR_INVALIDDATA;
66	}
67	type = bytestream2_get_byteu(&s->gb);
68	count = (type & 0x7F) + 1;
69	type &= 0x80;
70	if (!type) {
71	do {
72	int n = FFMIN(count, w - x);
73	bytestream2_get_buffer(&s->gb, dst, n * depth);
74	count -= n;
75	dst += n * depth;
76	x += n;
77	if (x == w) {
78	x = 0;
79	dst = line = advance_line(start, line, stride, &y, h, interleave);
80	}
81	} while (dst && count > 0);
82	} else {
83	uint8_t tmp[4];
84	bytestream2_get_buffer(&s->gb, tmp, depth);
85	do {
86	int n = FFMIN(count, w - x);
87	count -= n;
88	x += n;
89	do {
90	memcpy(dst, tmp, depth);
91	dst += depth;
92	} while (--n);
93	if (x == w) {
94	x = 0;
95	dst = line = advance_line(start, line, stride, &y, h, interleave);
96	}
97	} while (dst && count > 0);
98	}
99	}
100
101	if (count) {
102	av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n");
103	return AVERROR_INVALIDDATA;
104	}
105
106	return 0;
107	}
108
109	static int decode_frame(AVCodecContext *avctx,
110	void data, int got_frame,
111	AVPacket *avpkt)
112	{
113	TargaContext * const s = avctx->priv_data;
114	AVFrame * const p = data;
115	uint8_t *dst;
116	int stride;
117	int idlen, pal, compr, y, w, h, bpp, flags, ret;
118	int first_clr, colors, csize;
119	int interleave;
120
121	bytestream2_init(&s->gb, avpkt->data, avpkt->size);
122
123	/* parse image header */
124	idlen = bytestream2_get_byte(&s->gb);
125	pal = bytestream2_get_byte(&s->gb);
126	compr = bytestream2_get_byte(&s->gb);
127	first_clr = bytestream2_get_le16(&s->gb);
128	colors = bytestream2_get_le16(&s->gb);
129	csize = bytestream2_get_byte(&s->gb);
130	bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */
131	w = bytestream2_get_le16(&s->gb);
132	h = bytestream2_get_le16(&s->gb);
133	bpp = bytestream2_get_byte(&s->gb);
134
135	if (bytestream2_get_bytes_left(&s->gb) <= idlen) {
136	av_log(avctx, AV_LOG_ERROR,
137	"Not enough data to read header\n");
138	return AVERROR_INVALIDDATA;
139	}
140
141	flags = bytestream2_get_byte(&s->gb);
142
143	if (!pal && (first_clr \|\| colors \|\| csize)) {
144	av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
145	// specification says we should ignore those value in this case
146	first_clr = colors = csize = 0;
147	}
148
149	// skip identifier if any
150	bytestream2_skip(&s->gb, idlen);
151
152	switch (bpp) {
153	case 8:
154	avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8;
155	break;
156	case 15:
157	case 16:
158	avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
159	break;
160	case 24:
161	avctx->pix_fmt = AV_PIX_FMT_BGR24;
162	break;
163	case 32:
164	avctx->pix_fmt = AV_PIX_FMT_BGRA;
165	break;
166	default:
167	av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp);
168	return AVERROR_INVALIDDATA;
169	}
170
171	if (colors && (colors + first_clr) > 256) {
172	av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
173	return AVERROR_INVALIDDATA;
174	}
175
176	if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
177	return ret;
178
179	if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
180	return ret;
181	p->pict_type = AV_PICTURE_TYPE_I;
182
183	if (flags & TGA_TOPTOBOTTOM) {
184	dst = p->data[0];
185	stride = p->linesize[0];
186	} else { //image is upside-down
187	dst = p->data[0] + p->linesize[0] * (h - 1);
188	stride = -p->linesize[0];
189	}
190
191	interleave = flags & TGA_INTERLEAVE2 ? 2 :
192	flags & TGA_INTERLEAVE4 ? 4 : 1;
193
194	if (colors) {
195	int pal_size, pal_sample_size;
196
197	switch (csize) {
198	case 32: pal_sample_size = 4; break;
199	case 24: pal_sample_size = 3; break;
200	case 16:
201	case 15: pal_sample_size = 2; break;
202	default:
203	av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
204	return AVERROR_INVALIDDATA;
205	}
206	pal_size = colors * pal_sample_size;
207	if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway
208	bytestream2_skip(&s->gb, pal_size);
209	else {
210	int t;
211	uint32_t pal = ((uint32_t )p->data[1]) + first_clr;
212
213	if (bytestream2_get_bytes_left(&s->gb) < pal_size) {
214	av_log(avctx, AV_LOG_ERROR,
215	"Not enough data to read palette\n");
216	return AVERROR_INVALIDDATA;
217	}
218	switch (pal_sample_size) {
219	case 4:
220	for (t = 0; t < colors; t++)
221	*pal++ = bytestream2_get_le32u(&s->gb);
222	break;
223	case 3:
224	/* RGB24 */
225	for (t = 0; t < colors; t++)
226	*pal++ = (0xffU<<24) \| bytestream2_get_le24u(&s->gb);
227	break;
228	case 2:
229	/* RGB555 */
230	for (t = 0; t < colors; t++) {
231	uint32_t v = bytestream2_get_le16u(&s->gb);
232	v = ((v & 0x7C00) << 9) \|
233	((v & 0x03E0) << 6) \|
234	((v & 0x001F) << 3);
235	/* left bit replication */
236	v \|= (v & 0xE0E0E0U) >> 5;
237	*pal++ = (0xffU<<24) \| v;
238	}
239	break;
240	}
241	p->palette_has_changed = 1;
242	}
243	}
244
245	if ((compr & (~TGA_RLE)) == TGA_NODATA) {
246	memset(p->data[0], 0, p->linesize[0] * h);
247	} else {
248	if (compr & TGA_RLE) {
249	int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave);
250	if (res < 0)
251	return res;
252	} else {
253	size_t img_size = w * ((bpp + 1) >> 3);
254	uint8_t *line;
255	if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
256	av_log(avctx, AV_LOG_ERROR,
257	"Not enough data available for image\n");
258	return AVERROR_INVALIDDATA;
259	}
260
261	line = dst;
262	y = 0;
263	do {
264	bytestream2_get_buffer(&s->gb, line, img_size);
265	line = advance_line(dst, line, stride, &y, h, interleave);
266	} while (line);
267	}
268	}
269
270	if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip
271	int x;
272	for (y = 0; y < h; y++) {
273	void line = &p->data[0][y p->linesize[0]];
274	for (x = 0; x < w >> 1; x++) {
275	switch (bpp) {
276	case 32:
277	FFSWAP(uint32_t, ((uint32_t )line)[x], ((uint32_t )line)[w - x - 1]);
278	break;
279	case 24:
280	FFSWAP(uint8_t, ((uint8_t )line)[3 x ], ((uint8_t )line)[3 w - 3 * x - 3]);
281	FFSWAP(uint8_t, ((uint8_t )line)[3 x + 1], ((uint8_t )line)[3 w - 3 * x - 2]);
282	FFSWAP(uint8_t, ((uint8_t )line)[3 x + 2], ((uint8_t )line)[3 w - 3 * x - 1]);
283	break;
284	case 16:
285	FFSWAP(uint16_t, ((uint16_t )line)[x], ((uint16_t )line)[w - x - 1]);
286	break;
287	case 8:
288	FFSWAP(uint8_t, ((uint8_t )line)[x], ((uint8_t )line)[w - x - 1]);
289	}
290	}
291	}
292	}
293
294	*got_frame = 1;
295
296	return avpkt->size;
297	}
298
299	AVCodec ff_targa_decoder = {
300	.name = "targa",
301	.long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
302	.type = AVMEDIA_TYPE_VIDEO,
303	.id = AV_CODEC_ID_TARGA,
304	.priv_data_size = sizeof(TargaContext),
305	.decode = decode_frame,
306	.capabilities = CODEC_CAP_DR1,
307	};