static const int desired_video_buffers = 256;
-enum io_method {
- io_read,
- io_mmap,
- io_userptr
-};
-
struct video_data {
AVClass *class;
int fd;
int frame_format; /* V4L2_PIX_FMT_* */
- enum io_method io_method;
int width, height;
int frame_size;
int interlaced;
return 0;
}
-static int read_init(AVFormatContext *ctx)
-{
- return -1;
-}
-
static void mmap_release_buffer(AVPacket *pkt)
{
struct v4l2_buffer buf;
return s->buf_len[buf.index];
}
-static int read_frame(AVFormatContext *ctx, AVPacket *pkt)
-{
- return -1;
-}
-
static int mmap_start(AVFormatContext *ctx)
{
struct video_data *s = ctx->priv_data;
avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
if (capabilities & V4L2_CAP_STREAMING) {
- s->io_method = io_mmap;
- res = mmap_init(s1);
- if (res == 0) {
+ if (!(res = mmap_init(s1)))
res = mmap_start(s1);
- }
} else {
- s->io_method = io_read;
- res = read_init(s1);
+ res = AVERROR(ENOSYS);
}
if (res < 0) {
close(s->fd);
-
- res = AVERROR(EIO);
goto out;
}
s->top_field_first = first_field(s->fd);
AVFrame *frame = s1->streams[0]->codec->coded_frame;
int res;
- if (s->io_method == io_mmap) {
- av_init_packet(pkt);
- res = mmap_read_frame(s1, pkt);
- } else if (s->io_method == io_read) {
- if (av_new_packet(pkt, s->frame_size) < 0)
- return AVERROR(EIO);
-
- res = read_frame(s1, pkt);
- } else {
- return AVERROR(EIO);
- }
- if (res < 0) {
+ av_init_packet(pkt);
+ if ((res = mmap_read_frame(s1, pkt)) < 0) {
return res;
}
{
struct video_data *s = s1->priv_data;
- if (s->io_method == io_mmap) {
- mmap_close(s);
- }
+ mmap_close(s);
close(s->fd);
return 0;