static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap) { VideoData *s = s1->priv_data; int ret, first_index, last_index; char buf[1024]; ByteIOContext pb1, *f = &pb1; AVStream *st; st = av_new_stream(s1, 0); if (!st) { av_free(s); return -ENOMEM; } if (ap && ap->image_format) s->img_fmt = ap->image_format; strcpy(s->path, s1->filename); s->img_number = 0; /* find format */ if (s1->iformat->flags & AVFMT_NOFILE) s->is_pipe = 0; else s->is_pipe = 1; if (!ap || !ap->frame_rate) { st->codec.frame_rate = 25; st->codec.frame_rate_base = 1; } else { st->codec.frame_rate = ap->frame_rate; st->codec.frame_rate_base = ap->frame_rate_base; } if (!s->is_pipe) { if (find_image_range(&first_index, &last_index, s->path) < 0) goto fail; s->img_number = first_index; /* compute duration */ st->start_time = 0; st->duration = ((int64_t)AV_TIME_BASE * (last_index - first_index + 1) * st->codec.frame_rate_base) / st->codec.frame_rate; if (get_frame_filename(buf, sizeof(buf), s->path, s->img_number) < 0) goto fail; if (url_fopen(f, buf, URL_RDONLY) < 0) goto fail; } else { f = &s1->pb; } ret = av_read_image(f, s1->filename, s->img_fmt, read_header_alloc_cb, s); if (ret < 0) goto fail1; if (!s->is_pipe) { url_fclose(f); } else { url_fseek(f, 0, SEEK_SET); } st->codec.codec_type = CODEC_TYPE_VIDEO; st->codec.codec_id = CODEC_ID_RAWVIDEO; st->codec.width = s->width; st->codec.height = s->height; st->codec.pix_fmt = s->pix_fmt; s->img_size = avpicture_get_size(s->pix_fmt, s->width, s->height); return 0; fail1: if (!s->is_pipe) url_fclose(f); fail: av_free(s); return -EIO; }