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"
43 static const enum AVPixelFormat pixfmt_rgb24[] = {
44 AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE };
49 typedef struct EightBpsContext {
50 AVCodecContext *avctx;
54 unsigned char planemap[4];
65 static int decode_frame(AVCodecContext *avctx, void *data,
66 int *data_size, AVPacket *avpkt)
68 const uint8_t *buf = avpkt->data;
69 int buf_size = avpkt->size;
70 EightBpsContext * const c = avctx->priv_data;
71 const unsigned char *encoded = buf;
72 unsigned char *pixptr, *pixptr_end;
73 unsigned int height = avctx->height; // Real image height
74 unsigned int dlen, p, row;
75 const unsigned char *lp, *dp;
77 unsigned int planes = c->planes;
78 unsigned char *planemap = c->planemap;
81 avctx->release_buffer(avctx, &c->pic);
84 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
85 if (avctx->get_buffer(avctx, &c->pic) < 0){
86 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
90 /* Set data pointer after line lengths */
91 dp = encoded + planes * (height << 1);
93 for (p = 0; p < planes; p++) {
94 /* Lines length pointer for this plane */
95 lp = encoded + p * (height << 1);
98 for (row = 0; row < height; row++) {
99 pixptr = c->pic.data[0] + row * c->pic.linesize[0] + planemap[p];
100 pixptr_end = pixptr + c->pic.linesize[0];
101 dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
102 /* Decode a row of this plane */
104 if (dp + 1 >= buf + buf_size)
106 if ((count = *dp++) <= 127) {
109 if (pixptr + count * planes > pixptr_end)
111 if (dp + count > buf + buf_size)
119 if (pixptr + count * planes > pixptr_end)
132 if (avctx->bits_per_coded_sample <= 8) {
133 const uint8_t *pal = av_packet_get_side_data(avpkt,
137 c->pic.palette_has_changed = 1;
138 memcpy(c->pal, pal, AVPALETTE_SIZE);
141 memcpy (c->pic.data[1], c->pal, AVPALETTE_SIZE);
144 *data_size = sizeof(AVFrame);
145 *(AVFrame*)data = c->pic;
147 /* always report that the buffer was completely consumed */
157 static av_cold int decode_init(AVCodecContext *avctx)
159 EightBpsContext * const c = avctx->priv_data;
162 c->pic.data[0] = NULL;
164 avcodec_get_frame_defaults(&c->pic);
165 switch (avctx->bits_per_coded_sample) {
167 avctx->pix_fmt = AV_PIX_FMT_PAL8;
169 c->planemap[0] = 0; // 1st plane is palette indexes
172 avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24);
174 c->planemap[0] = 2; // 1st plane is red
175 c->planemap[1] = 1; // 2nd plane is green
176 c->planemap[2] = 0; // 3rd plane is blue
179 avctx->pix_fmt = AV_PIX_FMT_RGB32;
182 c->planemap[0] = 1; // 1st plane is red
183 c->planemap[1] = 2; // 2nd plane is green
184 c->planemap[2] = 3; // 3rd plane is blue
185 c->planemap[3] = 0; // 4th plane is alpha
187 c->planemap[0] = 2; // 1st plane is red
188 c->planemap[1] = 1; // 2nd plane is green
189 c->planemap[2] = 0; // 3rd plane is blue
190 c->planemap[3] = 3; // 4th plane is alpha
194 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
195 avctx->bits_per_coded_sample);
207 * Uninit 8BPS decoder
210 static av_cold int decode_end(AVCodecContext *avctx)
212 EightBpsContext * const c = avctx->priv_data;
215 avctx->release_buffer(avctx, &c->pic);
222 AVCodec ff_eightbps_decoder = {
224 .type = AVMEDIA_TYPE_VIDEO,
225 .id = AV_CODEC_ID_8BPS,
226 .priv_data_size = sizeof(EightBpsContext),
229 .decode = decode_frame,
230 .capabilities = CODEC_CAP_DR1,
231 .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),