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)
37 #include "libavutil/intreadwrite.h"
41 static const enum PixelFormat pixfmt_rgb24[] = {PIX_FMT_BGR24, PIX_FMT_RGB32, PIX_FMT_NONE};
46 typedef struct EightBpsContext {
48 AVCodecContext *avctx;
52 unsigned char planemap[4];
63 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
65 const uint8_t *buf = avpkt->data;
66 int buf_size = avpkt->size;
67 EightBpsContext * const c = avctx->priv_data;
68 const unsigned char *encoded = buf;
69 unsigned char *pixptr, *pixptr_end;
70 unsigned int height = avctx->height; // Real image height
71 unsigned int dlen, p, row;
72 const unsigned char *lp, *dp;
74 unsigned int planes = c->planes;
75 unsigned char *planemap = c->planemap;
78 avctx->release_buffer(avctx, &c->pic);
81 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
82 if(avctx->get_buffer(avctx, &c->pic) < 0){
83 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
87 /* Set data pointer after line lengths */
88 dp = encoded + planes * (height << 1);
90 for (p = 0; p < planes; p++) {
91 /* Lines length pointer for this plane */
92 lp = encoded + p * (height << 1);
95 for(row = 0; row < height; row++) {
96 pixptr = c->pic.data[0] + row * c->pic.linesize[0] + planemap[p];
97 pixptr_end = pixptr + c->pic.linesize[0];
98 dlen = av_be2ne16(*(const unsigned short *)(lp+row*2));
99 /* Decode a row of this plane */
101 if(dp + 1 >= buf+buf_size) return -1;
102 if ((count = *dp++) <= 127) {
105 if (pixptr + count * planes > pixptr_end)
107 if(dp + count > buf+buf_size) return -1;
114 if (pixptr + count * planes > pixptr_end)
127 if (avctx->bits_per_coded_sample <= 8) {
128 const uint8_t *pal = av_packet_get_side_data(avpkt,
132 c->pic.palette_has_changed = 1;
133 memcpy(c->pal, pal, AVPALETTE_SIZE);
136 memcpy (c->pic.data[1], c->pal, AVPALETTE_SIZE);
139 *data_size = sizeof(AVFrame);
140 *(AVFrame*)data = c->pic;
142 /* always report that the buffer was completely consumed */
152 static av_cold int decode_init(AVCodecContext *avctx)
154 EightBpsContext * const c = avctx->priv_data;
158 avcodec_get_frame_defaults(&c->pic);
159 c->pic.data[0] = NULL;
161 switch (avctx->bits_per_coded_sample) {
163 avctx->pix_fmt = PIX_FMT_PAL8;
165 c->planemap[0] = 0; // 1st plane is palette indexes
168 avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24);
170 c->planemap[0] = 2; // 1st plane is red
171 c->planemap[1] = 1; // 2nd plane is green
172 c->planemap[2] = 0; // 3rd plane is blue
175 avctx->pix_fmt = PIX_FMT_RGB32;
178 c->planemap[0] = 1; // 1st plane is red
179 c->planemap[1] = 2; // 2nd plane is green
180 c->planemap[2] = 3; // 3rd plane is blue
181 c->planemap[3] = 0; // 4th plane is alpha
183 c->planemap[0] = 2; // 1st plane is red
184 c->planemap[1] = 1; // 2nd plane is green
185 c->planemap[2] = 0; // 3rd plane is blue
186 c->planemap[3] = 3; // 4th plane is alpha
190 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n", avctx->bits_per_coded_sample);
202 * Uninit 8BPS decoder
205 static av_cold int decode_end(AVCodecContext *avctx)
207 EightBpsContext * const c = avctx->priv_data;
210 avctx->release_buffer(avctx, &c->pic);
217 AVCodec ff_eightbps_decoder = {
219 .type = AVMEDIA_TYPE_VIDEO,
221 .priv_data_size = sizeof(EightBpsContext),
224 .decode = decode_frame,
225 .capabilities = CODEC_CAP_DR1,
226 .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),