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;
52 unsigned char planemap[4];
57 static int decode_frame(AVCodecContext *avctx, void *data,
58 int *got_frame, AVPacket *avpkt)
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;
74 avctx->release_buffer(avctx, &c->pic);
77 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
78 if ((ret = ff_get_buffer(avctx, &c->pic)) < 0) {
79 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
83 /* Set data pointer after line lengths */
84 dp = encoded + planes * (height << 1);
86 for (p = 0; p < planes; p++) {
87 /* Lines length pointer for this plane */
88 lp = encoded + p * (height << 1);
91 for (row = 0; row < height; row++) {
92 pixptr = c->pic.data[0] + row * c->pic.linesize[0] + planemap[p];
93 pixptr_end = pixptr + c->pic.linesize[0];
94 if(lp - encoded + row*2 + 1 >= buf_size)
96 dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
97 /* Decode a row of this plane */
99 if (dp + 1 >= buf + buf_size)
100 return AVERROR_INVALIDDATA;
101 if ((count = *dp++) <= 127) {
104 if (pixptr + count * planes > pixptr_end)
106 if (dp + count > buf + buf_size)
107 return AVERROR_INVALIDDATA;
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);
140 *(AVFrame*)data = c->pic;
142 /* always report that the buffer was completely consumed */
146 static av_cold int decode_init(AVCodecContext *avctx)
148 EightBpsContext * const c = avctx->priv_data;
151 c->pic.data[0] = NULL;
153 avcodec_get_frame_defaults(&c->pic);
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 = avctx->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;
171 c->planemap[0] = 1; // 1st plane is red
172 c->planemap[1] = 2; // 2nd plane is green
173 c->planemap[2] = 3; // 3rd plane is blue
174 c->planemap[3] = 0; // 4th plane is alpha
176 c->planemap[0] = 2; // 1st plane is red
177 c->planemap[1] = 1; // 2nd plane is green
178 c->planemap[2] = 0; // 3rd plane is blue
179 c->planemap[3] = 3; // 4th plane is alpha
183 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
184 avctx->bits_per_coded_sample);
185 return AVERROR_INVALIDDATA;
191 static av_cold int decode_end(AVCodecContext *avctx)
193 EightBpsContext * const c = avctx->priv_data;
196 avctx->release_buffer(avctx, &c->pic);
201 AVCodec ff_eightbps_decoder = {
203 .type = AVMEDIA_TYPE_VIDEO,
204 .id = AV_CODEC_ID_8BPS,
205 .priv_data_size = sizeof(EightBpsContext),
208 .decode = decode_frame,
209 .capabilities = CODEC_CAP_DR1,
210 .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),