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

/*
 * PC Paintbrush PCX (.pcx) image encoder
 * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
 *
 * 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
 */

/**
 * @file
 * PCX image encoder
 * @author Daniel Verkamp
 * @see http://www.qzx.com/pc-gpe/pcx.txt
 */

#include "avcodec.h"
#include "bytestream.h"
#include "libavutil/imgutils.h"
#include "internal.h"

static const uint32_t monoblack_pal[16] = { 0x000000, 0xFFFFFF };

static av_cold int pcx_encode_init(AVCodecContext *avctx)
{
    avctx->coded_frame = av_frame_alloc();
    if (!avctx->coded_frame)
        return AVERROR(ENOMEM);

    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
    avctx->coded_frame->key_frame = 1;

    return 0;
}

static av_cold int pcx_encode_close(AVCodecContext *avctx)
{
    av_frame_free(&avctx->coded_frame);
    return 0;
}

/**
 * PCX run-length encoder
 * @param dst output buffer
 * @param dst_size size of output buffer
 * @param src input buffer
 * @param src_plane_size size of one plane of input buffer in bytes
 * @param nplanes number of planes in input buffer
 * @return number of bytes written to dst or -1 on error
 * @bug will not work for nplanes != 1 && bpp != 8
 */
static int pcx_rle_encode(      uint8_t *dst, int dst_size,
                          const uint8_t *src, int src_plane_size, int nplanes)
{
    int p;
    const uint8_t *dst_start = dst;

    // check worst-case upper bound on dst_size
    if (dst_size < 2LL * src_plane_size * nplanes || src_plane_size <= 0)
        return -1;

    for (p = 0; p < nplanes; p++) {
        int count = 1;
        const uint8_t *src_plane = src + p;
        const uint8_t *src_plane_end = src_plane + src_plane_size * nplanes;
        uint8_t prev = *src_plane;
        src_plane += nplanes;

        for (; ; src_plane += nplanes) {
            if (src_plane < src_plane_end && *src_plane == prev && count < 0x3F) {
                // current byte is same as prev
                ++count;
            } else {
                // output prev * count
                if (count != 1 || prev >= 0xC0)
                    *dst++ = 0xC0 | count;
                *dst++ = prev;

                if (src_plane == src_plane_end)
                    break;

                // start new run
                count = 1;
                prev = *src_plane;
            }
        }
    }

    return dst - dst_start;
}

static int pcx_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                            const AVFrame *frame, int *got_packet)
{
    const uint8_t *buf_end;
    uint8_t *buf;

    int bpp, nplanes, i, y, line_bytes, written, ret, max_pkt_size, sw, sh;
    const uint32_t *pal = NULL;
    uint32_t palette256[256];
    const uint8_t *src;

    if (avctx->width > 65535 || avctx->height > 65535) {
        av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n");
        return -1;
    }

    switch (avctx->pix_fmt) {
    case AV_PIX_FMT_RGB24:
        bpp = 8;
        nplanes = 3;
        break;
    case AV_PIX_FMT_RGB8:
    case AV_PIX_FMT_BGR8:
    case AV_PIX_FMT_RGB4_BYTE:
    case AV_PIX_FMT_BGR4_BYTE:
    case AV_PIX_FMT_GRAY8:
        bpp = 8;
        nplanes = 1;
        avpriv_set_systematic_pal2(palette256, avctx->pix_fmt);
        pal = palette256;
        break;
    case AV_PIX_FMT_PAL8:
        bpp = 8;
        nplanes = 1;
        pal = (uint32_t *)frame->data[1];
        break;
    case AV_PIX_FMT_MONOBLACK:
        bpp = 1;
        nplanes = 1;
        pal = monoblack_pal;
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "unsupported pixfmt\n");
        return -1;
    }

    line_bytes = (avctx->width * bpp + 7) >> 3;
    line_bytes = (line_bytes + 1) & ~1;

    max_pkt_size = 128 + avctx->height * 2 * line_bytes * nplanes + (pal ? 256*3 + 1 : 0);
    if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0)
        return ret;
    buf     = pkt->data;
    buf_end = pkt->data + pkt->size;

    sw = avctx->sample_aspect_ratio.num;
    sh = avctx->sample_aspect_ratio.den;
    if (sw > 0xFFFFu || sh > 0xFFFFu)
        av_reduce(&sw, &sh, sw, sh, 0xFFFFu);

    bytestream_put_byte(&buf, 10);                  // manufacturer
    bytestream_put_byte(&buf, 5);                   // version
    bytestream_put_byte(&buf, 1);                   // encoding
    bytestream_put_byte(&buf, bpp);                 // bits per pixel per plane
    bytestream_put_le16(&buf, 0);                   // x min
    bytestream_put_le16(&buf, 0);                   // y min
    bytestream_put_le16(&buf, avctx->width - 1);    // x max
    bytestream_put_le16(&buf, avctx->height - 1);   // y max
    bytestream_put_le16(&buf, sw);                  // horizontal DPI
    bytestream_put_le16(&buf, sh);                  // vertical DPI
    for (i = 0; i < 16; i++)
        bytestream_put_be24(&buf, pal ? pal[i] : 0);// palette (<= 16 color only)
    bytestream_put_byte(&buf, 0);                   // reserved
    bytestream_put_byte(&buf, nplanes);             // number of planes
    bytestream_put_le16(&buf, line_bytes);          // scanline plane size in bytes

    while (buf - pkt->data < 128)
        *buf++= 0;

    src = frame->data[0];

    for (y = 0; y < avctx->height; y++) {
        if ((written = pcx_rle_encode(buf, buf_end - buf,
                                      src, line_bytes, nplanes)) < 0) {
            av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
            return -1;
        }
        buf += written;
        src += frame->linesize[0];
    }

    if (nplanes == 1 && bpp == 8) {
        if (buf_end - buf < 257) {
            av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
            return -1;
        }
        bytestream_put_byte(&buf, 12);
        for (i = 0; i < 256; i++) {
            bytestream_put_be24(&buf, pal[i]);
        }
    }

    pkt->size   = buf - pkt->data;
    pkt->flags |= AV_PKT_FLAG_KEY;
    *got_packet = 1;

    return 0;
}

AVCodec ff_pcx_encoder = {
    .name           = "pcx",
    .long_name      = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_PCX,
    .init           = pcx_encode_init,
    .close          = pcx_encode_close,
    .encode2        = pcx_encode_frame,
    .pix_fmts       = (const enum AVPixelFormat[]){
        AV_PIX_FMT_RGB24,
        AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
        AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
        AV_PIX_FMT_MONOBLACK,
        AV_PIX_FMT_NONE
    },
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* PC Paintbrush PCX (.pcx) image encoder
	3	* Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
	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	/**
	23	* @file
	24	* PCX image encoder
	25	* @author Daniel Verkamp
	26	* @see http://www.qzx.com/pc-gpe/pcx.txt
	27	*/
	28
	29	#include "avcodec.h"
	30	#include "bytestream.h"
	31	#include "libavutil/imgutils.h"
	32	#include "internal.h"
	33
	34	static const uint32_t monoblack_pal[16] = { 0x000000, 0xFFFFFF };
	35
	36	static av_cold int pcx_encode_init(AVCodecContext *avctx)
	37	{
	38	avctx->coded_frame = av_frame_alloc();
	39	if (!avctx->coded_frame)
	40	return AVERROR(ENOMEM);
	41
	42	avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
	43	avctx->coded_frame->key_frame = 1;
	44
	45	return 0;
	46	}
	47
	48	static av_cold int pcx_encode_close(AVCodecContext *avctx)
	49	{
	50	av_frame_free(&avctx->coded_frame);
	51	return 0;
	52	}
	53
	54	/**
	55	* PCX run-length encoder
	56	* @param dst output buffer
	57	* @param dst_size size of output buffer
	58	* @param src input buffer
	59	* @param src_plane_size size of one plane of input buffer in bytes
	60	* @param nplanes number of planes in input buffer
	61	* @return number of bytes written to dst or -1 on error
	62	* @bug will not work for nplanes != 1 && bpp != 8
	63	*/
	64	static int pcx_rle_encode( uint8_t *dst, int dst_size,
65	const uint8_t *src, int src_plane_size, int nplanes)
66	{
67	int p;
68	const uint8_t *dst_start = dst;
69
70	// check worst-case upper bound on dst_size
71	if (dst_size < 2LL * src_plane_size * nplanes \|\| src_plane_size <= 0)
72	return -1;
73
74	for (p = 0; p < nplanes; p++) {
75	int count = 1;
76	const uint8_t *src_plane = src + p;
77	const uint8_t src_plane_end = src_plane + src_plane_size nplanes;
78	uint8_t prev = *src_plane;
79	src_plane += nplanes;
80
81	for (; ; src_plane += nplanes) {
82	if (src_plane < src_plane_end && *src_plane == prev && count < 0x3F) {
83	// current byte is same as prev
84	++count;
85	} else {
86	// output prev * count
87	if (count != 1 \|\| prev >= 0xC0)
88	*dst++ = 0xC0 \| count;
89	*dst++ = prev;
90
91	if (src_plane == src_plane_end)
92	break;
93
94	// start new run
95	count = 1;
96	prev = *src_plane;
97	}
98	}
99	}
100
101	return dst - dst_start;
102	}
103
104	static int pcx_encode_frame(AVCodecContext avctx, AVPacket pkt,
105	const AVFrame frame, int got_packet)
106	{
107	const uint8_t *buf_end;
108	uint8_t *buf;
109
110	int bpp, nplanes, i, y, line_bytes, written, ret, max_pkt_size, sw, sh;
111	const uint32_t *pal = NULL;
112	uint32_t palette256[256];
113	const uint8_t *src;
114
115	if (avctx->width > 65535 \|\| avctx->height > 65535) {
116	av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n");
117	return -1;
118	}
119
120	switch (avctx->pix_fmt) {
121	case AV_PIX_FMT_RGB24:
122	bpp = 8;
123	nplanes = 3;
124	break;
125	case AV_PIX_FMT_RGB8:
126	case AV_PIX_FMT_BGR8:
127	case AV_PIX_FMT_RGB4_BYTE:
128	case AV_PIX_FMT_BGR4_BYTE:
129	case AV_PIX_FMT_GRAY8:
130	bpp = 8;
131	nplanes = 1;
132	avpriv_set_systematic_pal2(palette256, avctx->pix_fmt);
133	pal = palette256;
134	break;
135	case AV_PIX_FMT_PAL8:
136	bpp = 8;
137	nplanes = 1;
138	pal = (uint32_t *)frame->data[1];
139	break;
140	case AV_PIX_FMT_MONOBLACK:
141	bpp = 1;
142	nplanes = 1;
143	pal = monoblack_pal;
144	break;
145	default:
146	av_log(avctx, AV_LOG_ERROR, "unsupported pixfmt\n");
147	return -1;
148	}
149
150	line_bytes = (avctx->width * bpp + 7) >> 3;
151	line_bytes = (line_bytes + 1) & ~1;
152
153	max_pkt_size = 128 + avctx->height * 2 * line_bytes * nplanes + (pal ? 256*3 + 1 : 0);
154	if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0)
155	return ret;
156	buf = pkt->data;
157	buf_end = pkt->data + pkt->size;
158
159	sw = avctx->sample_aspect_ratio.num;
160	sh = avctx->sample_aspect_ratio.den;
161	if (sw > 0xFFFFu \|\| sh > 0xFFFFu)
162	av_reduce(&sw, &sh, sw, sh, 0xFFFFu);
163
164	bytestream_put_byte(&buf, 10); // manufacturer
165	bytestream_put_byte(&buf, 5); // version
166	bytestream_put_byte(&buf, 1); // encoding
167	bytestream_put_byte(&buf, bpp); // bits per pixel per plane
168	bytestream_put_le16(&buf, 0); // x min
169	bytestream_put_le16(&buf, 0); // y min
170	bytestream_put_le16(&buf, avctx->width - 1); // x max
171	bytestream_put_le16(&buf, avctx->height - 1); // y max
172	bytestream_put_le16(&buf, sw); // horizontal DPI
173	bytestream_put_le16(&buf, sh); // vertical DPI
174	for (i = 0; i < 16; i++)
175	bytestream_put_be24(&buf, pal ? pal[i] : 0);// palette (<= 16 color only)
176	bytestream_put_byte(&buf, 0); // reserved
177	bytestream_put_byte(&buf, nplanes); // number of planes
178	bytestream_put_le16(&buf, line_bytes); // scanline plane size in bytes
179
180	while (buf - pkt->data < 128)
181	*buf++= 0;
182
183	src = frame->data[0];
184
185	for (y = 0; y < avctx->height; y++) {
186	if ((written = pcx_rle_encode(buf, buf_end - buf,
187	src, line_bytes, nplanes)) < 0) {
188	av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
189	return -1;
190	}
191	buf += written;
192	src += frame->linesize[0];
193	}
194
195	if (nplanes == 1 && bpp == 8) {
196	if (buf_end - buf < 257) {
197	av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
198	return -1;
199	}
200	bytestream_put_byte(&buf, 12);
201	for (i = 0; i < 256; i++) {
202	bytestream_put_be24(&buf, pal[i]);
203	}
204	}
205
206	pkt->size = buf - pkt->data;
207	pkt->flags \|= AV_PKT_FLAG_KEY;
208	*got_packet = 1;
209
210	return 0;
211	}
212
213	AVCodec ff_pcx_encoder = {
214	.name = "pcx",
215	.long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
216	.type = AVMEDIA_TYPE_VIDEO,
217	.id = AV_CODEC_ID_PCX,
218	.init = pcx_encode_init,
219	.close = pcx_encode_close,
220	.encode2 = pcx_encode_frame,
221	.pix_fmts = (const enum AVPixelFormat[]){
222	AV_PIX_FMT_RGB24,
223	AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
224	AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
225	AV_PIX_FMT_MONOBLACK,
226	AV_PIX_FMT_NONE
227	},
228	};