1/*
2 * Raw Video Decoder
3 * Copyright (c) 2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22/**
23 * @file libavcodec/rawdec.c
24 * Raw Video Decoder
25 */
26
27#include "avcodec.h"
28#include "raw.h"
29
30typedef struct RawVideoContext {
31    unsigned char * buffer;  /* block of memory for holding one frame */
32    int             length;  /* number of bytes in buffer */
33    int flip;
34    AVFrame pic;             ///< AVCodecContext.coded_frame
35} RawVideoContext;
36
37static const PixelFormatTag pixelFormatBpsAVI[] = {
38    { PIX_FMT_PAL8,    4 },
39    { PIX_FMT_PAL8,    8 },
40    { PIX_FMT_RGB555, 15 },
41    { PIX_FMT_RGB555, 16 },
42    { PIX_FMT_BGR24,  24 },
43    { PIX_FMT_RGB32,  32 },
44    { PIX_FMT_NONE, 0 },
45};
46
47static const PixelFormatTag pixelFormatBpsMOV[] = {
48    /* FIXME fix swscaler to support those */
49    /* http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/chapter_4_section_2.html */
50    { PIX_FMT_PAL8,      4 },
51    { PIX_FMT_PAL8,      8 },
52    { PIX_FMT_BGR555,   16 },
53    { PIX_FMT_RGB24,    24 },
54    { PIX_FMT_BGR32_1,  32 },
55    { PIX_FMT_NONE, 0 },
56};
57
58static enum PixelFormat findPixelFormat(const PixelFormatTag *tags, unsigned int fourcc)
59{
60    while (tags->pix_fmt >= 0) {
61        if (tags->fourcc == fourcc)
62            return tags->pix_fmt;
63        tags++;
64    }
65    return PIX_FMT_YUV420P;
66}
67
68static av_cold int raw_init_decoder(AVCodecContext *avctx)
69{
70    RawVideoContext *context = avctx->priv_data;
71
72    if (avctx->codec_tag == MKTAG('r','a','w',' '))
73        avctx->pix_fmt = findPixelFormat(pixelFormatBpsMOV, avctx->bits_per_coded_sample);
74    else if (avctx->codec_tag)
75        avctx->pix_fmt = findPixelFormat(ff_raw_pixelFormatTags, avctx->codec_tag);
76    else if (avctx->bits_per_coded_sample)
77        avctx->pix_fmt = findPixelFormat(pixelFormatBpsAVI, avctx->bits_per_coded_sample);
78
79    context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
80    context->buffer = av_malloc(context->length);
81    context->pic.pict_type = FF_I_TYPE;
82    context->pic.key_frame = 1;
83
84    avctx->coded_frame= &context->pic;
85
86    if (!context->buffer)
87        return -1;
88
89    if(avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9))
90        context->flip=1;
91
92    return 0;
93}
94
95static void flip(AVCodecContext *avctx, AVPicture * picture){
96    picture->data[0] += picture->linesize[0] * (avctx->height-1);
97    picture->linesize[0] *= -1;
98}
99
100static int raw_decode(AVCodecContext *avctx,
101                            void *data, int *data_size,
102                            const uint8_t *buf, int buf_size)
103{
104    RawVideoContext *context = avctx->priv_data;
105
106    AVFrame * frame = (AVFrame *) data;
107    AVPicture * picture = (AVPicture *) data;
108
109    frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
110    frame->top_field_first = avctx->coded_frame->top_field_first;
111
112    //4bpp raw in avi and mov (yes this is ugly ...)
113    if(avctx->bits_per_coded_sample == 4 && avctx->pix_fmt==PIX_FMT_PAL8 &&
114       (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
115        int i;
116        for(i=256*2; i+1 < context->length>>1; i++){
117            context->buffer[2*i+0]= buf[i-256*2]>>4;
118            context->buffer[2*i+1]= buf[i-256*2]&15;
119        }
120        buf= context->buffer + 256*4;
121        buf_size= context->length - 256*4;
122    }
123
124    if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
125        return -1;
126
127    avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
128    if(avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length){
129        frame->data[1]= context->buffer;
130    }
131    if (avctx->palctrl && avctx->palctrl->palette_changed) {
132        memcpy(frame->data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
133        avctx->palctrl->palette_changed = 0;
134    }
135
136    if(context->flip)
137        flip(avctx, picture);
138
139    if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2'))
140    {
141        // swap fields
142        unsigned char *tmp = picture->data[1];
143        picture->data[1] = picture->data[2];
144        picture->data[2] = tmp;
145    }
146
147    *data_size = sizeof(AVPicture);
148    return buf_size;
149}
150
151static av_cold int raw_close_decoder(AVCodecContext *avctx)
152{
153    RawVideoContext *context = avctx->priv_data;
154
155    av_freep(&context->buffer);
156    return 0;
157}
158
159AVCodec rawvideo_decoder = {
160    "rawvideo",
161    CODEC_TYPE_VIDEO,
162    CODEC_ID_RAWVIDEO,
163    sizeof(RawVideoContext),
164    raw_init_decoder,
165    NULL,
166    raw_close_decoder,
167    raw_decode,
168    .long_name = NULL_IF_CONFIG_SMALL("raw video"),
169};
170