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/*
2
 * Copyright (c) 2013 Lukasz Marek
3
 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
20
 
21
#include 
22
#include 
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#include 
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#include 
25
#include 
26
#include "libavutil/pixdesc.h"
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#include "libavutil/log.h"
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#include "libavutil/mem.h"
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#include "libavutil/opt.h"
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#include "libavformat/avformat.h"
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#include "fbdev_common.h"
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#include "avdevice.h"
33
 
34
typedef struct {
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    AVClass *class;                   ///< class for private options
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    int xoffset;                      ///< x coordinate of top left corner
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    int yoffset;                      ///< y coordinate of top left corner
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    struct fb_var_screeninfo varinfo; ///< framebuffer variable info
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    struct fb_fix_screeninfo fixinfo; ///< framebuffer fixed info
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    int fd;                           ///< framebuffer device file descriptor
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    uint8_t *data;                    ///< framebuffer data
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} FBDevContext;
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44
static av_cold int fbdev_write_header(AVFormatContext *h)
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{
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    FBDevContext *fbdev = h->priv_data;
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    enum AVPixelFormat pix_fmt;
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    int ret, flags = O_RDWR;
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    const char* device;
50
 
51
    if (h->nb_streams != 1 || h->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO) {
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        av_log(fbdev, AV_LOG_ERROR, "Only a single video stream is supported.\n");
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        return AVERROR(EINVAL);
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    }
55
 
56
    if (h->filename[0])
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        device = h->filename;
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    else
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        device = ff_fbdev_default_device();
60
 
61
    if ((fbdev->fd = avpriv_open(device, flags)) == -1) {
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        ret = AVERROR(errno);
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        av_log(h, AV_LOG_ERROR,
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               "Could not open framebuffer device '%s': %s\n",
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               device, av_err2str(ret));
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        return ret;
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    }
68
 
69
    if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
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        ret = AVERROR(errno);
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        av_log(h, AV_LOG_ERROR, "FBIOGET_VSCREENINFO: %s\n", av_err2str(ret));
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        goto fail;
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    }
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75
    if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) {
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        ret = AVERROR(errno);
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        av_log(h, AV_LOG_ERROR, "FBIOGET_FSCREENINFO: %s\n", av_err2str(ret));
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        goto fail;
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    }
80
 
81
    pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
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    if (pix_fmt == AV_PIX_FMT_NONE) {
83
        ret = AVERROR(EINVAL);
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        av_log(h, AV_LOG_ERROR, "Framebuffer pixel format not supported.\n");
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        goto fail;
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    }
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88
    fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_WRITE, MAP_SHARED, fbdev->fd, 0);
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    if (fbdev->data == MAP_FAILED) {
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        ret = AVERROR(errno);
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        av_log(h, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret));
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        goto fail;
93
    }
94
 
95
    return 0;
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  fail:
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    close(fbdev->fd);
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    return ret;
99
}
100
 
101
static int fbdev_write_packet(AVFormatContext *h, AVPacket *pkt)
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{
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    FBDevContext *fbdev = h->priv_data;
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    uint8_t *pin, *pout;
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    enum AVPixelFormat fb_pix_fmt;
106
    int disp_height;
107
    int bytes_to_copy;
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    AVCodecContext *codec_ctx = h->streams[0]->codec;
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    enum AVPixelFormat video_pix_fmt = codec_ctx->pix_fmt;
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    int video_width = codec_ctx->width;
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    int video_height = codec_ctx->height;
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    int bytes_per_pixel = ((codec_ctx->bits_per_coded_sample + 7) >> 3);
113
    int src_line_size = video_width * bytes_per_pixel;
114
    int i;
115
 
116
    if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0)
117
        av_log(h, AV_LOG_WARNING,
118
               "Error refreshing variable info: %s\n", av_err2str(AVERROR(errno)));
119
 
120
    fb_pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
121
 
122
    if (fb_pix_fmt != video_pix_fmt) {
123
        av_log(h, AV_LOG_ERROR, "Pixel format %s is not supported, use %s\n",
124
               av_get_pix_fmt_name(video_pix_fmt), av_get_pix_fmt_name(fb_pix_fmt));
125
        return AVERROR(EINVAL);
126
    }
127
 
128
    disp_height = FFMIN(fbdev->varinfo.yres, video_height);
129
    bytes_to_copy = FFMIN(fbdev->varinfo.xres, video_width) * bytes_per_pixel;
130
 
131
    pin  = pkt->data;
132
    pout = fbdev->data +
133
           bytes_per_pixel * fbdev->varinfo.xoffset +
134
           fbdev->varinfo.yoffset * fbdev->fixinfo.line_length;
135
 
136
    if (fbdev->xoffset) {
137
        if (fbdev->xoffset < 0) {
138
            if (-fbdev->xoffset >= video_width) //nothing to display
139
                return 0;
140
            bytes_to_copy += fbdev->xoffset * bytes_per_pixel;
141
            pin -= fbdev->xoffset * bytes_per_pixel;
142
        } else {
143
            int diff = (video_width + fbdev->xoffset) - fbdev->varinfo.xres;
144
            if (diff > 0) {
145
                if (diff >= video_width) //nothing to display
146
                    return 0;
147
                bytes_to_copy -= diff * bytes_per_pixel;
148
            }
149
            pout += bytes_per_pixel * fbdev->xoffset;
150
        }
151
    }
152
 
153
    if (fbdev->yoffset) {
154
        if (fbdev->yoffset < 0) {
155
            if (-fbdev->yoffset >= video_height) //nothing to display
156
                return 0;
157
            disp_height += fbdev->yoffset;
158
            pin -= fbdev->yoffset * src_line_size;
159
        } else {
160
            int diff = (video_height + fbdev->yoffset) - fbdev->varinfo.yres;
161
            if (diff > 0) {
162
                if (diff >= video_height) //nothing to display
163
                    return 0;
164
                disp_height -= diff;
165
            }
166
            pout += fbdev->yoffset * fbdev->fixinfo.line_length;
167
        }
168
    }
169
 
170
    for (i = 0; i < disp_height; i++) {
171
        memcpy(pout, pin, bytes_to_copy);
172
        pout += fbdev->fixinfo.line_length;
173
        pin  += src_line_size;
174
    }
175
 
176
    return 0;
177
}
178
 
179
static av_cold int fbdev_write_trailer(AVFormatContext *h)
180
{
181
    FBDevContext *fbdev = h->priv_data;
182
    munmap(fbdev->data, fbdev->fixinfo.smem_len);
183
    close(fbdev->fd);
184
    return 0;
185
}
186
 
187
static int fbdev_get_device_list(AVFormatContext *s, AVDeviceInfoList *device_list)
188
{
189
    return ff_fbdev_get_device_list(device_list);
190
}
191
 
192
#define OFFSET(x) offsetof(FBDevContext, x)
193
#define ENC AV_OPT_FLAG_ENCODING_PARAM
194
static const AVOption options[] = {
195
    { "xoffset", "set x coordinate of top left corner", OFFSET(xoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
196
    { "yoffset", "set y coordinate of top left corner", OFFSET(yoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
197
    { NULL }
198
};
199
 
200
static const AVClass fbdev_class = {
201
    .class_name = "fbdev outdev",
202
    .item_name  = av_default_item_name,
203
    .option     = options,
204
    .version    = LIBAVUTIL_VERSION_INT,
205
    .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
206
};
207
 
208
AVOutputFormat ff_fbdev_muxer = {
209
    .name           = "fbdev",
210
    .long_name      = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
211
    .priv_data_size = sizeof(FBDevContext),
212
    .audio_codec    = AV_CODEC_ID_NONE,
213
    .video_codec    = AV_CODEC_ID_RAWVIDEO,
214
    .write_header   = fbdev_write_header,
215
    .write_packet   = fbdev_write_packet,
216
    .write_trailer  = fbdev_write_trailer,
217
    .get_device_list = fbdev_get_device_list,
218
    .flags          = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
219
    .priv_class     = &fbdev_class,
220
};