2 * Quicktime Planar RGB (8BPS) Video Decoder
3 * Copyright (C) 2003 Roberto Togni
5 * This file is part of FFmpeg.
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.
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.
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
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 alpha)
38 #include "libavutil/internal.h"
39 #include "libavutil/intreadwrite.h"
44 static const enum AVPixelFormat pixfmt_rgb24[] = {
45 AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE };
47 typedef struct EightBpsContext {
48 AVCodecContext *avctx;
51 unsigned char planemap[4];
56 static int decode_frame(AVCodecContext *avctx, void *data,
57 int *got_frame, AVPacket *avpkt)
59 AVFrame *frame = data;
60 const uint8_t *buf = avpkt->data;
61 int buf_size = avpkt->size;
62 EightBpsContext * const c = avctx->priv_data;
63 const unsigned char *encoded = buf;
64 unsigned char *pixptr, *pixptr_end;
65 unsigned int height = avctx->height; // Real image height
66 unsigned int dlen, p, row;
67 const unsigned char *lp, *dp;
69 unsigned int planes = c->planes;
70 unsigned char *planemap = c->planemap;
73 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
76 /* Set data pointer after line lengths */
77 dp = encoded + planes * (height << 1);
79 for (p = 0; p < planes; p++) {
80 /* Lines length pointer for this plane */
81 lp = encoded + p * (height << 1);
84 for (row = 0; row < height; row++) {
85 pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
86 pixptr_end = pixptr + frame->linesize[0];
87 if(lp - encoded + row*2 + 1 >= buf_size)
89 dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
90 /* Decode a row of this plane */
92 if (dp + 1 >= buf + buf_size)
93 return AVERROR_INVALIDDATA;
94 if ((count = *dp++) <= 127) {
97 if (pixptr + count * planes > pixptr_end)
99 if (dp + count > buf + buf_size)
100 return AVERROR_INVALIDDATA;
107 if (pixptr + count * planes > pixptr_end)
120 if (avctx->bits_per_coded_sample <= 8) {
121 const uint8_t *pal = av_packet_get_side_data(avpkt,
125 frame->palette_has_changed = 1;
126 memcpy(c->pal, pal, AVPALETTE_SIZE);
129 memcpy (frame->data[1], c->pal, AVPALETTE_SIZE);
134 /* always report that the buffer was completely consumed */
138 static av_cold int decode_init(AVCodecContext *avctx)
140 EightBpsContext * const c = avctx->priv_data;
144 switch (avctx->bits_per_coded_sample) {
146 avctx->pix_fmt = AV_PIX_FMT_PAL8;
148 c->planemap[0] = 0; // 1st plane is palette indexes
151 avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24);
153 c->planemap[0] = 2; // 1st plane is red
154 c->planemap[1] = 1; // 2nd plane is green
155 c->planemap[2] = 0; // 3rd plane is blue
158 avctx->pix_fmt = AV_PIX_FMT_RGB32;
161 c->planemap[0] = 1; // 1st plane is red
162 c->planemap[1] = 2; // 2nd plane is green
163 c->planemap[2] = 3; // 3rd plane is blue
164 c->planemap[3] = 0; // 4th plane is alpha
166 c->planemap[0] = 2; // 1st plane is red
167 c->planemap[1] = 1; // 2nd plane is green
168 c->planemap[2] = 0; // 3rd plane is blue
169 c->planemap[3] = 3; // 4th plane is alpha
173 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
174 avctx->bits_per_coded_sample);
175 return AVERROR_INVALIDDATA;
181 AVCodec ff_eightbps_decoder = {
183 .type = AVMEDIA_TYPE_VIDEO,
184 .id = AV_CODEC_ID_8BPS,
185 .priv_data_size = sizeof(EightBpsContext),
187 .decode = decode_frame,
188 .capabilities = CODEC_CAP_DR1,
189 .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),