2 * Quicktime Planar RGB (8BPS) Video Decoder
3 * Copyright (C) 2003 Roberto Togni
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * QT 8BPS Video Decoder by Roberto Togni
25 * For more information about the 8BPS format, visit:
26 * http://www.pcisys.net/~melanson/codecs/
28 * Supports: PAL8 (RGB 8bpp, paletted)
29 * : BGR24 (RGB 24bpp) (can also output it as RGB32)
30 * : RGB32 (RGB 32bpp, 4th plane is probably alpha and it's ignored)
37 #include "libavutil/internal.h"
38 #include "libavutil/intreadwrite.h"
43 static const enum AVPixelFormat pixfmt_rgb24[] = {
44 AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE };
46 typedef struct EightBpsContext {
47 AVCodecContext *avctx;
50 unsigned char planemap[4];
55 static int decode_frame(AVCodecContext *avctx, void *data,
56 int *got_frame, AVPacket *avpkt)
58 AVFrame *frame = data;
59 const uint8_t *buf = avpkt->data;
60 int buf_size = avpkt->size;
61 EightBpsContext * const c = avctx->priv_data;
62 const unsigned char *encoded = buf;
63 unsigned char *pixptr, *pixptr_end;
64 unsigned int height = avctx->height; // Real image height
65 unsigned int dlen, p, row;
66 const unsigned char *lp, *dp, *ep;
69 unsigned int planes = c->planes;
70 unsigned char *planemap = c->planemap;
73 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
74 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
78 ep = encoded + buf_size;
80 /* Set data pointer after line lengths */
81 dp = encoded + planes * (height << 1);
83 /* Ignore alpha plane, don't know what to do with it */
87 px_inc = planes + (avctx->pix_fmt == AV_PIX_FMT_RGB32);
89 for (p = 0; p < planes; p++) {
90 /* Lines length pointer for this plane */
91 lp = encoded + p * (height << 1);
94 for (row = 0; row < height; row++) {
95 pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
96 pixptr_end = pixptr + frame->linesize[0];
97 if (ep - lp < row * 2 + 2)
98 return AVERROR_INVALIDDATA;
99 dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
100 /* Decode a row of this plane */
103 return AVERROR_INVALIDDATA;
104 if ((count = *dp++) <= 127) {
107 if (pixptr_end - pixptr < count * px_inc)
110 return AVERROR_INVALIDDATA;
117 if (pixptr_end - pixptr < count * px_inc)
130 if (avctx->bits_per_coded_sample <= 8) {
131 const uint8_t *pal = av_packet_get_side_data(avpkt,
135 frame->palette_has_changed = 1;
136 memcpy(c->pal, pal, AVPALETTE_SIZE);
139 memcpy (frame->data[1], c->pal, AVPALETTE_SIZE);
144 /* always report that the buffer was completely consumed */
148 static av_cold int decode_init(AVCodecContext *avctx)
150 EightBpsContext * const c = avctx->priv_data;
154 switch (avctx->bits_per_coded_sample) {
156 avctx->pix_fmt = AV_PIX_FMT_PAL8;
158 c->planemap[0] = 0; // 1st plane is palette indexes
161 avctx->pix_fmt = ff_get_format(avctx, pixfmt_rgb24);
163 c->planemap[0] = 2; // 1st plane is red
164 c->planemap[1] = 1; // 2nd plane is green
165 c->planemap[2] = 0; // 3rd plane is blue
168 avctx->pix_fmt = AV_PIX_FMT_RGB32;
170 /* handle planemap setup later for decoding rgb24 data as rbg32 */
173 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
174 avctx->bits_per_coded_sample);
175 return AVERROR_INVALIDDATA;
178 if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
179 c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2; // 1st plane is red
180 c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1; // 2nd plane is green
181 c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0; // 3rd plane is blue
182 c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3; // 4th plane is alpha???
187 AVCodec ff_eightbps_decoder = {
189 .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
190 .type = AVMEDIA_TYPE_VIDEO,
191 .id = AV_CODEC_ID_8BPS,
192 .priv_data_size = sizeof(EightBpsContext),
194 .decode = decode_frame,
195 .capabilities = AV_CODEC_CAP_DR1,